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Hardware Implementation of the Joint Precoding Sub-System and MIMO Detection Preprocessor in IEEE 802.11n/ac WLAN

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Abstract

The compressed beamforming weights feedback is used in the MIMO-OFDM IEEE 802.11n/ac WLAN to reduce the amount of feedback information. The precoded sub-system at the receiver side of this system needs to perform singular value decomposition (SVD) on the estimated channel matrices at all sub-carriers, and to quantize the angles representing the right singular vectors to be fed back to the transmitter. Under the exemplary scenario of four antennas at the access point and two antennas at the station, our designed architecture for the precoding sub-system can compute the quantized angles fast enough to meet the requirement of the 80 MHz bandwidth transmission for the IEEE 802.11n/ac standard. Furthermore, by taking advantage of the SVD outputs, we demonstrate algorithmic complexity reduction for computing the preprocessing QRD for the tree search detectors. Surprisingly, although additional function to provide preprocessing QRD for future signal detection, our architecture for computing both SVD and QRD requires approximately the same amount of gates as one earlier architecture to compute the SVD only.

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Acknowledgements

The authors greatly appreciate the National Chip Implementation Center of Taiwan for providing technical support over the duration of this work.

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Authors and Affiliations

  1. Graduate Institute of Communications Engineering, National Chung Cheng University, 168 University Rd., Min-Shiung, Chia-Yi, Taiwan

    Cheng-Hsing Tseng & Tsung-Hsien Liu

  2. Wistron NeWeb Corp., Hsin-Chu, Taiwan

    Yang-Cheng Lin

  3. Department of Electrical Engineering, National Chung Cheng University, 168 University Rd., Min-Shiung, Chia-Yi, Taiwan

    Yuan-Sun Chu

  4. Advanced Institute for Manufacturing with High-tech Innovations (AIM-HI), National Chung Cheng University, 168 University Rd., Min-Shiung, Chia-Yi, Taiwan

    Yuan-Sun Chu

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  1. Cheng-Hsing Tseng
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  2. Tsung-Hsien Liu
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  4. Yuan-Sun Chu
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Correspondence to Tsung-Hsien Liu.

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This paper was supported in part by the Ministry of Science and Technology, Taiwan, under Contract MOST 103-2221-E-194-012.

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Tseng, CH., Liu, TH., Lin, YC. et al. Hardware Implementation of the Joint Precoding Sub-System and MIMO Detection Preprocessor in IEEE 802.11n/ac WLAN. J Sign Process Syst 91, 875–884 (2019). https://doi.org/10.1007/s11265-018-1400-9

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  • DOI: https://doi.org/10.1007/s11265-018-1400-9

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