KR100841936B1 - Apparatus and method for combining received signal considering interference for each antenna, apparatus and method for computing symbol metric using it - Google Patents

Abstract

An apparatus and a method for combining a received signal considering interference by antenna, and an apparatus and a method for computing a symbol metric using the same are provided to perform exact combining and symbol metric computation when interference power by antenna is different, thereby improving performance of an portable Internet system performance. A channel estimation unit(310) estimates a channel by using a pilot signal of each signal after receiving signals from a receiving antenna. A noise and interference power estimation unit(320) estimates noise and interference power of each channel after receiving a channel-estimated outputted from the channel estimation unit. A combining unit(340) performs channel compensation of the channel estimated in the channel estimation unit, and the noise and interference power estimated according to channel in the noise and interference power estimation unit, and combines the channel-compensated received signals.

Description

Apparatus and method for combining received signal considering interference for each antenna, apparatus and method for computing symbol metric using it}

1 is a block diagram showing the configuration of a typical OFDM receiver.

2 is a block diagram illustrating a configuration of a reception signal combining apparatus considering interference by antennas in a wireless communication system having a plurality of reception antennas according to the present invention.

3 is a block diagram illustrating a configuration of a reception signal combining apparatus considering interference by antennas using the reception signal combining apparatus considering antenna-specific interference according to the present invention.

4 is a flowchart illustrating a method of combining received signals in consideration of interference for each antenna in a wireless communication system having a plurality of receive antennas according to the present invention.

5 is a flowchart illustrating a method of calculating a symbol metric in consideration of interference for each antenna using the received signal combining method of FIG. 4 according to the present invention.

The present invention relates to a receiving apparatus and method for a wireless communication system having a plurality of transmitting and receiving antennas, and more particularly, to a receiving signal combining apparatus and method considering an interference signal for each antenna, and a symbol metric calculating apparatus and method using the same. will be.

FIG. 1 is a block diagram showing a configuration of a general OFDM receiver, and schematically shows only a portion of restoring data from a baseband signal obtained from a received signal. The burst symbol extractor 100 extracts an OFDM symbol from a baseband signal obtained from a received signal by a radio frequency (RF) processor (not shown). In the OFDM symbol extracted by the burst symbol extracting unit 100, a cyclic prefix (CP) inserted at a transmitting end by a CP removing unit 102 is removed, and an FFT (Fast Fourier Transform) unit 104 is removed. Fast Fourier Transform) and then applied to the equalizer 108. Equalizer 108 compensates for channel distortion according to the channel characteristic value estimated by channel estimator 106 for the FFT data signal. The signal whose channel distortion is compensated for is demodulated by the demodulator 110 and then decoded by the decoding unit 112 and the data is restored by the determination of the decision unit 114.

Herein, it is assumed that the OFDM receiver is a multi-antenna receiver, and 16 quadrature amplitude modulation (QAM) modulation and demodulation is performed on an input signal. In addition, at the transmitting end, the n th information bit u _n is encoded and interleaved to be mapped to the k th symbol { b _l ( k ); l = 0, .., 3} is generated and then modulated. In the modulation process, one 16-QAM symbol s ( k ) is mapped every four bits from the interleaver. The transmitted symbols s (k) is subjected to a multiplication ever flat fading channel (multiplicative flat fading channel) in response to the m-th antenna h _m. The k th received symbol r _m ( k ) may be expressed as in Equation 1.

The received signal r _m ( k ) includes not only the faded symbol h _m ( k ) s ( k ) but also the noise ν ( k ). The noise ν ( k ) is a zero mean complex AWGN (Additive White Gaussian Noise) having a dispersion σ _ν ² . In Maximum Ratio Combining (MRC), each signal from another antenna compensates for channel effects, such as signal-to-noise ratio or signal-to-noise plus interference ratio, and a corresponding weight to improve the quality of the combined signal. ) a _m ( k ) (m = 1 to M) is multiplied by the conjugate complex number.

The antenna coupled and channel compensated signal is then demodulated (de-mapped) so that the log likelihood ratio (hereinafter referred to as LLR) corresponding to the interleaved code bits { b _i ( k )} at the transmitter { l _i ( k ); produces a set of i = 0, ..., 3}. The LLR recovers information bits that are input to the de-interleaver, decoded, and transmitted.

However, when the interference power of each antenna is different, accurate combining and symbolmetric calculation are required to improve the performance of the WiBro / WiMax system. That is, when the interference power is different for each channel, it is necessary to change the weight for each channel.

The technical problem to be achieved by the present invention is when the interference power for each antenna, which can improve the performance of the WiBro / WiMax system by combining the correct received signals when the interference power for each antenna is different. The present invention provides an apparatus and method for combining received signals in consideration of antenna-specific interference.

Another object of the present invention is to provide an apparatus and method for calculating a symbol metric considering antenna interference using the apparatus and method for receiving a received signal.

라 하고, 상기 잡음 및 간섭 파워 추정부에서 추정된 k번째 안테나에 상응하는 채널의 잡음 및 간섭 파워를 P _NI (k) 라 하고, k번째 안테나로부터 수신된 신호를 r(k) 라 할 때,

와 같이 표현될 수 있다.In order to achieve the above technical problem, a reception signal combining apparatus considering antenna interference according to the present invention is a reception signal combining apparatus considering antenna interference in a wireless communication system including at least one receiving antenna, wherein the receiving antenna A channel estimator which receives signals from the channel and estimates a channel using a pilot signal of each signal; A noise and interference power estimator for receiving a channel estimated output from the channel estimator to estimate noise and interference power of each channel; And a combiner for channel-compensating the noises and interference powers estimated by the channel estimation channels and the noise and interference power estimation unit for each channel, and combining the channel-compensated received signals. The signal coupled in the coupling section C _norm Is a channel estimated by the channel estimation

The noise and interference power of the channel corresponding to the k-th antenna estimated by the noise and interference power estimator When P _NI (k) and the signal received from the k-th antenna is r (k) ,

It can be expressed as

라 하고, 파일럿 이득을 s 라 하고, 프레임 내의 수신된 파일럿을 P(k), 채널추정을 위한 주변 파일럿의 개수를 N, 간섭기의 채널응답을 h _i (k) 이라 할 때,

와 같이 나타냄이 바람직하다.Preferably, the combiner combines the channel-compensated received signals by channel-compensating the estimated channels and data tones corresponding to the noise and interference powers estimated for each channel. Noise and Interference Power P _NI Is a channel estimated by the channel estimation

When the pilot gain is s, the received pilot in the frame is P (k) , the number of neighboring pilots for channel estimation is N, and the channel response of the interferer is h _i (k) .

It is preferable to indicate as follows.

In accordance with one aspect of the present invention, there is provided a method for combining received signals in consideration of antenna-specific interference in a wireless communication system including at least one receiving antenna. Estimating a channel using a pilot signal of each of the received signals by receiving the corresponding received signals; Estimating noise and interference power of each channel by receiving channel estimates estimated by the channel in the channel estimation; And combining the received signals compensated with the channel compensation by performing channel compensation on the basis of the estimated channels and data tones corresponding to the noise and interference powers estimated for each channel.

In order to achieve the another technical problem, a symbol metric calculation device considering interference by antenna according to the present invention is a symbol metric calculation device considering interference by antenna in a wireless communication system having at least one receiving antenna, wherein the reception A channel estimator receiving the received signals from the antenna and estimating a channel using the pilot signal of each signal; A noise and interference power estimator for receiving a channel estimated output from the channel estimator to estimate noise and interference power of each channel; A combiner which combines the channels estimated by the channel estimation and the received signals by channel compensation of the noise and interference powers estimated by the noise and interference power estimator; A variance calculator for calculating a variance of the data tone using a ratio of the channel estimated by the channel estimator and the noise and interference estimated by the noise and interference power estimator; And a symbol metric calculator for calculating a symbol metric using the variance calculated by the variance calculator and the received signals combined by the combiner.

라 하고, 상기 잡음 및 간섭 파워 추정부에서 추정된 k번째 안테나에 상응하는 채널의 잡음 및 간섭 파워를 P _NI (k) 라 하고, k번째 안테나로부터 수신된 신호를 r(k) 라 할 때,

와 같이 표현될 수 있다.Signal C _norm coupled at the coupling portion Is a channel estimated by the channel estimation

The noise and interference power of the channel corresponding to the k-th antenna estimated by the noise and interference power estimator P _NI When (k) and the signal received from the k-th antenna is r (k) ,

It can be expressed as

Preferably, the combiner combines the channel-compensated received signals by channel-compensating the estimated channels and data tones corresponding to the noise and interference powers estimated for each channel.

라 하고, 파일럿 이득을 s 라 하고, 프레임 내의 수신된 파일럿을 P(k), 채널추정을 위한 주변 파일럿의 개수를 N, 간섭기의 채널응답을 h _i (k)이라 할 때,

와 같이 나타낼 수 있다.The noise and interference power P _NI Is a channel estimated by the channel estimation

When the pilot gain is s, the received pilot in the frame is P (k) , the number of neighboring pilots for channel estimation is N, and the channel response of the interferer is h _i (k) .

Can be expressed as:

는 상기 채널추정부에서 추정된 채널을 h(k) 라 하고, 상기 잡음 및 간섭 파워 추정부에서 추정된 잡음 및 간섭 파워를 P _NI (k), 안테나 k로부터의 간섭의 합을

, 안테나 k로부터의 복소 가우시안 잡음의 추정된 분산을

라 할 때,

와 같이 나타낼 수 있다.Variance calculated by the variance calculator

Denotes a channel estimated by the channel estimator h (k) and denotes a noise and interference power estimated by the noise and interference power estimator. P _NI (k) , sum the interference from antenna k

The estimated variance of the complex Gaussian noise from antenna k

When we say

Can be expressed as:

Preferably, the variance calculator calculates a variance in the signal constellation of the data tone using the ratio of the estimated channel to the estimated noise and interference.

The symbol metric calculation unit has a log likelihood ratio (LLR) for QPSK.

In the case of 16QAM, the log likelihood ratio (LLR) is

 Can be expressed as:

In order to achieve the another technical problem, a symbol metric calculation method considering interference by antenna according to the present invention is a symbol metric calculation method considering interference by antenna in a wireless communication system having at least one receiving antenna, Estimating a channel by receiving received signals corresponding to each antenna and using a pilot signal of each received signal; Estimating noise and interference power of each channel by receiving channel estimates estimated by the channel in the channel estimation; Combining the channel compensated received signals by performing channel compensation on the basis of the estimated channels and data tones corresponding to the estimated noise and interference powers for each channel; Calculating a variance in the signal constellation of a data tone using the ratio of the estimated channel to the estimated noise and interference; And calculating a symbol metric using the calculated variance and the combined received signals.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. For reference, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted in the following description.

The main concept of the present invention calculates the interference power for accurate signal combining and symbol metric calculation when the interference power for each antenna is different, and uses it in signal combining and symbol metric calculation. That is, the present invention is characterized in that accurate maximum ratio combining (MRC) and symbol metric calculation are performed using noise and interference power received from each antenna.

2 is a block diagram illustrating a configuration of a reception signal combining apparatus considering interference by antennas in a wireless communication system having a plurality of reception antennas according to the present invention. 220 and the coupling portion 230 is made.

The channel estimator 210 receives a plurality of received signals corresponding to each of the reception antennas and estimates a channel using pilot signals around data tones of the respective reception signals.

The noise and interference power estimator 220 receives a plurality of outputs estimated by the channel estimator 210 and estimates noise and interference power of each channel.

The noise and interference power P _NI estimated by the noise and interference power estimator 220 may be represented by Equation 2.

는 상기 채널추정부(210)에서 추정된 채널을, s 는 파일럿 이득을, P(k)는 프레임 내의 수신된 파일럿을, N은 채널추정을 위한 주변 파일럿의 개수를, h _i (k) 는 간섭기(미도시)의 채널응답을 나타낸다. here,

Denotes a channel estimated by the channel estimator 210, s denotes a pilot gain, P (k) denotes a received pilot in a frame, N denotes the number of neighboring pilots for channel estimation, and h _i (k) denotes Shows the channel response of the interferer (not shown).

The combiner 230 performs channel compensation on the channels estimated by the channel estimator 210 and the noise and interference powers estimated by each channel by the noise and interference power estimator 220 for respective data tones. Combine the compensated received signals.

The received signal including the interference received from the antenna may be represented by Equation 3.

는 변조된 심볼(modulated symbol)이며, h(k)(k는 1, 2,..., L)는 안테나 k에 대한 타겟 사용자의 채널 응답, i(k) (k는 1, 2,..., L)는 안테나 k로부터의 간섭의 합, n(k)(k는 1, 2,..., L)는 안테나 k로부터의 복소 가우시안 잡음(분산

)을 나타낸다.Where r (k) (k is 1, 2, ..., L) is the signal received from antenna k,

Is the modulated symbol, h (k) (k is 1, 2, ..., L) is the target user's channel response for antenna k, i (k) (k is 1, 2,. .., L) is the sum of interference from antenna k, n (k) (k is 1, 2, ..., L) is the complex Gaussian noise (distribution) from antenna k

).

Based on Equation 3, the general maximum ratio combining is shown in Equation 4.

A combined signal normalized using Equations 3 and 4 may be represented as Equation 5.

The signal coupled by the coupling unit 230 is C _{norm Speaking of} C _norm Can be expressed as in Equation 6.

는 상기 채널추정부(210)에서 추정된 채널을, P _NI (k)는 상기 잡음 및 간섭 파워 추정부(220)에서 추정된 k번째 안테나에 상응하는 채널의 잡음 및 간섭 파워를, r(k)는 k번째 안테나로부터 수신된 신호를 나타낸다.here,

Denotes a channel estimated by the channel estimator 210, P _NI (k) represents the noise and interference power of the channel corresponding to the k-th antenna estimated by the noise and interference power estimator 220, and r (k) represents a signal received from the k-th antenna.

3 is a block diagram illustrating a configuration of a reception signal coupling apparatus considering interference by antenna using the reception signal coupling apparatus considering antenna-specific interference according to the present invention, and includes a channel estimation unit 310, noise and interference power. The estimator 320, the variance calculator 330, the combiner 340, and the symbol metric calculator 350 are included.

The channel estimator 310 receives inputs for a plurality of received signals corresponding to each of the receiving antennas, estimates a channel using pilot signals around data tones of the received signals, and estimates the channel 210 of FIG. 2. Is the same as

The noise and interference power estimator 220 receives a plurality of outputs estimated by the channel estimator 210 to estimate noise and interference power of each channel, and the noise and interference power estimator 220 of FIG. 2. Same as).

The combiner 340 performs channel compensation on the channels estimated by the channel estimator 310 and the noise and interference powers estimated by each channel by the noise and interference power estimator 320 for respective data tones. It combines the compensated received signals and is the same as the combiner 230 of FIG.

The variance calculator 330 uses the ratio of the channel estimated by the channel estimator 310 and the noise and interference estimated by the noise and interference power estimator 320 on the signal constellation of the data tone. Calculate the variance

The symbol metric calculator 350 calculates a symbol metric using the variance calculated by the variance calculator 330 and the received signals combined by the combiner 340.

이라 놓고, N' 의 분산(variance)을 구한 것이다. 여기서, N' 은 영 평균(zero mean)을 가지는 복소 가우시안 랜덤 변수(complex Gaussian random variable)이다.Equation 7 is expressed in Equation 6

This is the variance of N ' . Here, N ' is a complex Gaussian random variable having a zero mean.

Equation 8 shows that SINR is obtained using Equation 7.

Where SINR (k) is the SINR at the k-th antenna.

Since the decoder 360 requires a log-likelihood ratio (LLR) for each information bit, the symbol metric calculation after combining is based on the combined signal. Calculate the LLR.

C _normal obtained from Equation 4 is a circular-symmetric complex Gaussian distribution having a mean of s and a variation of Var (N ') . If Var ( N ' ) of the m th data tone in the FEC block is expressed as Var (m) , the modulated symbol and the combined symbol are represented by s (m) and C _norm (m) , respectively. .

이 된다.Equation 9 calculates the log-likelihood ratio (LLR) of the m th data tone, assuming BPSK having an equi-probable source. Since the variance of the real and imaginary parts of C _norm (m ) is the same, the variance is

Becomes

Equation 10 calculates the log-likelihood ratio (LLR) of the b th bit of the m th data tone in QPSK and 16QAM in a manner similar to the equation (9). If 64QAM is obtained in a similar manner, it can be expressed as Equation 11.

In the symbol metric calculation unit 350, a log likelihood ratio (LLR) in the case of QPSK may be represented by Equation 9, and in the case of 16QAM, it may be represented by Equation 10.

The LLRs obtained in Equations 9 and 10 are used during symbol metric calculation. If Var (m) does not change within a frame, then Var (m) can be ignored because it makes the same contribution to all branch metric calculations in trellis at decoding time.

In other words, if Var (m) is changed by tone-by-tone or slot-by-slot, the symbol Var (m) should be considered.

Equation 12 shows an estimate of Var (m) .

는 상기 채널추정부(310)에서 추정된 채널을

라 하고, 상기 잡음 및 간섭 파워 추정부(320)에서 추정된 잡음 및 간섭 파워를 P _NI (k), 안테나 k로부터의 간섭의 합을

, 안테나 k로부터의 복소 가우시안 잡음의 추정된 분산을

라 할 때, 수학식 13과 같이 나타낼 수 있다.Variance calculated by the variance calculator 330

The channel estimated by the channel estimation unit 310

The noise and interference power estimated by the noise and interference power estimator 320 are P _NI (k) and the sum of the interference from the antenna k.

The estimated variance of the complex Gaussian noise from antenna k

In this case, it can be expressed as Equation 13.

In Equation 12, the channel estimation for each data tone is not different from the conventional method, and the estimation of the noise + interference power ( Var (m) ) of interference and noise is as follows. Equation 14 shows the received pilot signal.

을 갖는 복소 가우시안 잡음을 나타낸다.Where P (k) is the received pilot with index k in one frame, s is the pilot gain, h (k) is the channel response of the target user, h _i (k) is the channel response of the interferer, b _i (k) is binary (1 if the mask of the interferer is the same as the mask of the target user, -1 otherwise), and n (k) is the variance

Represents a complex Gaussian noise with

Equation 15 represents an estimated channel response obtained by averaging N pilots around the pilot signal shown in Equation 14, including its own signal.

Equation 16 shows that the noise + interference power is calculated assuming h (k) = h (l) and h _i (k) = h _i (l) .

, 파일럿 이득 s, 프레임 내의 수신된 파일럿 P(k), 채널추정을 위한 주변 파일럿의 개수 N을 사용하여 표현한 식이다.Equation 17 is the channel estimated the power P _NI of the noise and interference

, The pilot gain s, the received pilot P (k) in the frame, and the number N of neighboring pilots for channel estimation.

4 is a flowchart illustrating a method of combining received signals in consideration of interference for each antenna in a wireless communication system having a plurality of receive antennas according to the present invention.

First, when a channel is allocated for each data tone corresponding to each of the reception antennas, the channels are estimated using pilot signals around the data tone. (S410) Equation 15 includes a pilot signal as its own signal. It shows the estimated channel response that averages the neighboring N pilots.

Then, noise and interference powers of the channel are estimated for each of the plurality of channels (step S420). The estimated noise and interference power P _{NI is} estimated. May be represented as in Equation 2.

When the channels are estimated and the noise and interference powers estimated for each channel are obtained, channel compensation is performed for each channel and data tone corresponding to noise and interference power, and the received channel compensated signals are combined (step S430). When the combined signal is _referred to as C _norm , the C _norm may be expressed as in Equation 6.

5 is a flowchart illustrating a symbol metric calculation method considering interference by antennas using the received signal combining method in consideration of the antenna-specific interference according to the present invention. When a channel is allocated for each data tone corresponding to each of the reception antennas, the channels are estimated using pilot signals around the data tone (step S510), which is the same as step S410 of FIG.

Then, noise and interference powers of the channel are estimated for each of the plurality of channels (step S520), which is the same as step S420 of FIG. 4. Next, in order to combine the channels, the channel-compensated received signals are combined by performing channel compensation on the basis of the estimated tones and the estimated noise and interference powers for each channel, by data tone (step S530). Same as step S430.

는 상기 추정된 채널을

라 하고, 상기 추정된 잡음 및 간섭 파워를 P _NI (k), 안테나 k로부터의 간섭의 합을

, 안테나 k로부터의 복소 가우시안 잡음의 추정된 분산을

라 할 때, 수학식 13과 같이 나타낼 수 있다.Meanwhile, the variance of the signal constellation of the data tone is calculated by using the ratio of the estimated channel and the estimated noise and interference (step S540).

Is the estimated channel

The estimated noise and interference power is referred to as P _NI. (k) , sum the interference from antenna k

The estimated variance of the complex Gaussian noise from antenna k

In this case, it can be expressed as Equation 13.

Finally, the symbol metric is calculated using the calculated variance and the combined received signals (step S550). The log likelihood ratio (LLR) used in calculating the symbol metric is expressed by Equation 10 in the case of QPSK. In case of 16QAM, it may be expressed as Equation (11).

On the other hand, the present invention described above can also be embodied as computer readable codes on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, hard disks, optical data storage devices, and also in the form of carrier waves (e.g., transmission over the Internet). It includes what is implemented. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. And functional programs, codes and code segments for implementing the present invention can be easily inferred by programmers in the art to which the present invention belongs.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features, The embodiments are to be understood in all respects as illustrative and not restrictive.

In addition, the scope of the present invention is specified by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted as

According to the present invention, it is possible to improve the performance of a WiBro / WiMax system by calculating accurate combining and symbol metric when the interference power for each antenna is different. In addition, the present invention is applicable to Wibro / WiMAX and OFDM systems.

Claims (14)

delete In the received signal combining apparatus considering interference by antenna in a wireless communication system having at least one receiving antenna, A channel estimator receiving signals from the receiving antenna and estimating a channel using pilot signals of the respective signals; A noise and interference power estimator for receiving a channel estimated output from the channel estimator to estimate noise and interference power of each channel; And And a combiner for channel-compensating the noises and interference powers estimated for each channel by the channels estimated by the channel estimation and the noise and interference power estimator, and combining the channel-compensated received signals. The signal C _norm coupled at the coupling portion is The channel estimated by the channel estimation

When the noise and interference power of the channel corresponding to the k-th antenna estimated by the noise and interference power estimator is called P _NI (k) , and the signal received from the k-th antenna is r (k) ,

Receive signal combining apparatus considering the interference by antenna, characterized in that expressed as. In the received signal combining apparatus considering interference by antenna in a wireless communication system having at least one receiving antenna, A channel estimator receiving signals from the receiving antenna and estimating a channel using pilot signals of the respective signals; A noise and interference power estimator for receiving a channel estimated output from the channel estimator to estimate noise and interference power of each channel; And And a combiner for channel-compensating the noises and interference powers estimated for each channel by the channels estimated by the channel estimation and the noise and interference power estimator, and combining the channel-compensated received signals. The combiner combines the received signals compensated for the antenna by combining the channel-compensated received signals by performing channel compensation on the basis of the estimated channels and data tones corresponding to the noise and interference powers estimated for each channel. . In the received signal combining apparatus considering interference by antenna in a wireless communication system having at least one receiving antenna, A channel estimator receiving signals from the receiving antenna and estimating a channel using pilot signals of the respective signals; A noise and interference power estimator for receiving a channel estimated output from the channel estimator to estimate noise and interference power of each channel; And And a combiner for channel-compensating the noises and interference powers estimated for each channel by the channels estimated by the channel estimation and the noise and interference power estimator, and combining the channel-compensated received signals. The noise and interference power P _NI The channel estimated by the channel estimation

When the pilot gain is s, the received pilot in the frame is P (k) , the number of neighboring pilots for channel estimation is N, and the channel response of the interferer is h _i (k) .

Receive signal combining apparatus considering the interference for each antenna, characterized in that as shown. delete Claims [1] A symbol metric calculation apparatus considering antenna interference in a wireless communication system having at least one receiving antenna. A channel estimator receiving the received signals from the receiving antenna and estimating a channel using the pilot signals of the respective signals; A noise and interference power estimator for receiving a channel estimated output from the channel estimator to estimate noise and interference power of each channel; A combiner which combines the channels estimated by the channel estimation and the received signals by channel compensation of the noise and interference powers estimated by the noise and interference power estimator; A variance calculator for calculating a variance of the data tone using a ratio of the channel estimated by the channel estimator and the noise and interference estimated by the noise and interference power estimator; And And a symbol metric calculation unit for calculating a symbol metric using the variance calculated by the dispersion calculator and the received signals coupled by the combiner. The signal C _norm of claim 6, wherein the signal C _norm is coupled at the coupling unit. Is The channel estimated by the channel estimation

The noise and interference power of the channel corresponding to the k-th antenna estimated by the noise and interference power estimator P _NI When (k) and the signal received from the k-th antenna is r (k) ,

Symbol metric calculation device considering the interference for each antenna, characterized in that expressed as. The method of claim 6, wherein the coupling portion And the channel-compensated received signals by combining the channel-compensated received signals by data compensation corresponding to the estimated channels and the noise and interference powers estimated for each channel. 7. The method of claim 6, wherein the noise and interference power P _NI Is The channel estimated by the channel estimation

When the pilot gain is s, the received pilot in the frame is P (k) , the number of neighboring pilots for channel estimation is N, and the channel response of the interferer is h _i (k) .

Symbol metric calculation device considering the interference by antenna, characterized in that shown as. The variance calculated by the variance calculator

Is The channel estimated by the channel estimation

The noise and interference power estimated by the noise and interference power estimator P _NI (k) , the sum of the interference from antenna k

The estimated variance of the complex Gaussian noise from antenna k

When we say

Symbol metric calculation device considering the interference by antenna, characterized in that can be represented as. The method of claim 6, wherein the variance calculator And calculating the variance in the signal constellation of the data tone by using the ratio of the estimated channel and the estimated noise and interference. The method of claim 6, wherein the symbol metric calculation unit Log Likelihood Ratio (LLR) for QPSK

Symbol metric calculation device considering the interference by antenna, characterized in that can be represented as. The method of claim 6, wherein the symbol metric calculation unit The Log Likelihood Ratio (LLR) for 16QAM

 Symbol metric calculation device considering the interference by antenna, characterized in that can be represented as. In the symbol communication method considering the interference for each antenna in a wireless communication system having at least one receiving antenna, Estimating a channel using a pilot signal of each of the received signals by receiving the received signals corresponding to each of the received antennas; Estimating noise and interference power of each channel by receiving channel estimates estimated by the channel in the channel estimation; Combining the channel compensated received signals by performing channel compensation on the basis of the estimated channels and data tones corresponding to the estimated noise and interference powers for each channel; Calculating a variance in the signal constellation of a data tone using the ratio of the estimated channel to the estimated noise and interference; And And calculating a symbol metric using the calculated variance and the combined received signals.

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