BER minimized OFDM systems with channel independent precoders
Journal
IEEE Transactions on Signal Processing
Journal Volume
51
Journal Issue
9
Pages
2369-2380
Date Issued
2003
Author(s)
Lin, Y.-P.
Abstract
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.
Subjects
BER optimal multicarrier; OFDM; Precoded OFDM; Single carrier
Other Subjects
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
Type
journal article
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