Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 34 views

    Backhaul Network Using Seamless Convergence of RoF

    Uploaded by

    Quang Hiệp Ngô
    The document discusses a high capacity wireless backhaul network using a convergence of radio-over-fiber and 90 GHz millimeter-wave technologies. Traditional cellular networks face problems due to increasing data usage, and microwave spectrum will become deficient. Two solutions are small cells and shifting to millimeter-wave bands, but a high capacity backhaul is needed. The proposed system uses radio-over-fiber to directly upconvert an optical signal to a 90 GHz radio signal for wireless transmission, keeping remote cells simple and efficient. The first block of the system involving a laser diode and Mach Ziener modulator was built and tested with an optical spectrum analyzer.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd

    Backhaul Network Using Seamless Convergence of RoF

    Uploaded by

    Quang Hiệp Ngô
    34 views10 pages
    The document discusses a high capacity wireless backhaul network using a convergence of radio-over-fiber and 90 GHz millimeter-wave technologies. Traditional cellular networks face problems due to increasing data usage, and microwave spectrum will become deficient. Two solutions are small cells and shifting to millimeter-wave bands, but a high capacity backhaul is needed. The proposed system uses radio-over-fiber to directly upconvert an optical signal to a 90 GHz radio signal for wireless transmission, keeping remote cells simple and efficient. The first block of the system involving a laser diode and Mach Ziener modulator was built and tested with an optical spectrum analyzer.

    Original Description:

    Wireless

    Copyright

    © © All Rights Reserved

    Available Formats

    PPTX, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    The document discusses a high capacity wireless backhaul network using a convergence of radio-over-fiber and 90 GHz millimeter-wave technologies. Traditional cellular networks face problems due to increasing data usage, and microwave spectrum will become deficient. Two solutions are small cells and shifting to millimeter-wave bands, but a high capacity backhaul is needed. The proposed system uses radio-over-fiber to directly upconvert an optical signal to a 90 GHz radio signal for wireless transmission, keeping remote cells simple and efficient. The first block of the system involving a laser diode and Mach Ziener modulator was built and tested with an optical spectrum analyzer.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    34 views10 pages

    Backhaul Network Using Seamless Convergence of RoF

    Uploaded by

    Quang Hiệp Ngô
    The document discusses a high capacity wireless backhaul network using a convergence of radio-over-fiber and 90 GHz millimeter-wave technologies. Traditional cellular networks face problems due to increasing data usage, and microwave spectrum will become deficient. Two solutions are small cells and shifting to millimeter-wave bands, but a high capacity backhaul is needed. The proposed system uses radio-over-fiber to directly upconvert an optical signal to a 90 GHz radio signal for wireless transmission, keeping remote cells simple and efficient. The first block of the system involving a laser diode and Mach Ziener modulator was built and tested with an optical spectrum analyzer.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 10

    High Capacity Wireless Backhaul

    Network Using Seamless


    Convergence of Radio-over-Fiber
    and 90 Ghz Millimeter - Wave
    Instructor: Nguyen Tan Hung
    Team 3: Nguyen Ky Tri
    Nguyen Minh Thai
    Ngo Quang Hiep
    1. Introduction
    Due the development of smartphone usages and the exponential growth of user data traffic
    The traditional cellular networks which based on macrocell deployment are facing many problems.
    This could leads to the fact the microwave (MW) will be reduce in spectrum deficit in near future.
    There are 2 solutions for this:
    a. Mobile network based on small cells could be key solution in increase the transmission capacity.
    b. Shifting carrier frequencies from a MW band in to Millimeter-Wave (MMW) band is another
    solution.
    Introduction
    The remote cells should be very compact, simple, energy efficient, and equipped with only
    simple functionality. Complex and intelligent functions should be centrally located at the
    central offices and shared to many base stations. Recently, cloud-based radio access
    networks (C-RANs) have been garnering significant interest to provide a cost-effective,
    energy-efficient, and high spectral-efficient solution for future access network .
    In both cases, however, a backhaul network connecting a growing number of small base
    stations and supporting a C-RAN network is extremely important. Such a backhaul network
    should have high capacity, flexibility, low transmission delay, low cost, and high energy
    efficiency.
    There have been several techniques to realize a convergence of MMW-wireless and
    fiber-optic system for a mobile wireless backhaul network
    In the 1st way, we can see that the structure of both RAUs and RRHs is complicated,
    resulting in high cost and high power consumption. In addition, with the inclusion of
    signal processing and signal conversions at the RAU and RRH, latency and jitter are big
    issues for a C-RAN backhaul network.
    On the contrary, radio-over-fiber (RoF) is a promising technology for seamless
    convergence of radio and fiber-optic networks, as shown in b. RoF technology could
    directly convert an optical signal to radio form at high frequency using a photonic
    direct up-conversion technique. The direct generation of an MMW signal from the
    RoF link is crucial to keep the remote cells simple, cost effective, and energy
    efficient. It also assures transparency and low-latency transmission for the wireless
    signals. In addition, because the signals are transmitted directly in the analog RF
    format, the system can enable multiple radios, including multi-bands, multi-services,
    and multi-operators to coexist in the backhaul.
    Drawbacks
    The impairments associated with the RoF link, such as nonlinearity distortion and
    noise, would have a deleterious impact on the quality of the generated MMW signal.
    The impairments during up- and down-conversion of the signal to and from the MMW
    band would also have other influences on the transmitted wireless signals.
    Target in this project
    We will use a system employs a photonic technique to generate an optical
    MMW signal at the center station (CS), and a direct photonic up-conversion
    technique at the RAU to directly emit a 90-GHz signal into the air.
    First block model
    In order to successfully build this system, we have to build it separately which
    means we have to build it part by part.
    The first part we built is the Laser Diode (LD) to the Mach Ziener Modulator (
    MZM). To test, we use a optical spectrum analyzer at the end of MZM.
    Result of 1st block
    After adjusting the input we can observe this output at the end of the MZM

    You might also like