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Implementation of Baseband Receiver Circuits for MIMO-OFDM Wireless Communication Systems
|關鍵字:||OFDM;正交分頻多工;MIMO;CFO;IQ Imbalance;Precoding;Detector;多輸入多輸出;載波頻率漂移;IQ不平衡;預先編碼器;偵測器||出版社:||電機工程學系所||引用:|| A. F. Molisch, Wireless Communications, Wiley, 2006.  R. W. Chang, “Synthesis of band-limited orthogonal signals for multichannel data transmission,” Bell Systems Technical Journal, vol. 46, pp. 1775-1796, Dec. 1966.  L. J. Cimini, “Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing,” IEEE Trans. Commun., vol. 33, pp.665-675, July 1985.  G. L. Stuber, J. R. Barry, S. W. McLaughlin, Ye Li M. A. Ingram, and T.G. Pratt, “Broadband MIMO-OFDM wireless communications,” Proc. IEEE, vol. 92, pp. 271-294, Feb. 2004.  A. J. Paulraj, D. A. Gore, R. U. Nabar, and H. Bolcskei, “An overview of MIMO communications - a key to gigabit wireless,” Proc. IEEE, vol. 92, pp. 198-218, Feb. 2004.  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Leon, Linear Algebra with Applications, New Jersey: Pearson, 2006.||摘要:||
This dissertation presents an implementation of baseband receiver circuits for MIMO-OFDM wireless communication systems based on IEEE 802.11n specification. The receiver includes three major blocks: compensation of carrier frequency offset (CFO) and IQ imbalance, M-modification MC-CDMA system using the Tomlinson-Harashima Precoding (THP), and MIMO-OFDM detection. First, the compensation of CFO and IQ imbalance circuit is designed with a low-complexity architecture. The integrated CFO and IQ compensation circuit reduces 15.7% of area by using hardware sharing.
The second study investigates the feasibility of applying THP to MC-CDMA system downlinks, in which multiple-access interference and possible complexity in the mobile terminal (MT) are major burdens. A THP based on the minimum mean-square error (MMSE) criterion is also presented, making it possible to realize a low-complexity receiver at the MT. The hardware architecture of the MMSE THP with modified QR decomposition at the transmitter is presented, along with the required word-length analyzed. For a generic square matrix of order n RQ decomposition, the latency required is n(2n＋3) clock cycles only.
At last, in MIMO-OFDM detection, we presented an improved K-Best sphere decoding algorithm and hardware architecture. It uses a regular way to select K value for different detected layers. The bit error rate of the proposed method was better than the conventional K-Best sphere decoding algorithm. In addition, a modified implementation of QR decomposition for detection pre-processor is presented based on the Givens rotation method. Implementation results reveal that the proposed recursive QR decomposition (RQRD) architecture has lower clock latency than triangular systolic array (TSA) structures and smaller hardware area than Gram-Schmidt structures.
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