https://scholars.lib.ntu.edu.tw/handle/123456789/303421
標題: | BER minimized OFDM systems with channel independent precoders | 作者: | Lin, Y.-P. SEE-MAY PHOONG |
關鍵字: | BER optimal multicarrier; OFDM; Precoded OFDM; Single carrier | 公開日期: | 2003 | 卷: | 51 | 期: | 9 | 起(迄)頁: | 2369-2380 | 來源出版物: | IEEE Transactions on Signal Processing | 摘要: | We consider the minimization of uncoded bit error rate (BER) for the orthogonal frequency division multiplexing (OFDM) system with an orthogonal precoder. We analyze the BER performance of precoded OFDM systems with zero forcing and minimum mean squared error (MMSE) receivers. In the case of MMSE receivers, we show that for quadrature phase shift keying (QPSK), there exists a class of optimal precoders that are channel independent. Examples of this class include the discrete Fourier transform (DFT) matrix and the Hadamard matrix. When the precoder is the DFT matrix, the resulting optimal transceiver becomes the single carrier system with cyclic prefix (SC-CP) system. We also show that the worst solution corresponds to the conventional OFDM system; the conventional OFDM system has the largest BER. In the case of zero forcing receivers, the design of optimal transceiver depends on signal-to-noise ratio (SNR). For higher SNR, solutions of optimal precoders are the same as those of MMSE receivers. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-0041910908&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/303421 |
ISSN: | 1053587X | DOI: | 10.1109/TSP.2003.815391 | SDG/關鍵字: | Bit error rate; Discrete Fourier transforms; Matrix algebra; Optimization; Quadrature phase shift keying; Signal to noise ratio; Transceivers; Hadamard matrix; Minimum mean squared error receivers; Orthogonal frequency division multiplexing |
顯示於: | 電信工程學研究所 |
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