BER minimized OFDM systems with channel independent precoders

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 re...

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Bibliographic Details
Published in:IEEE transactions on signal processing Vol. 51; no. 9; pp. 2369 - 2380
Main Authors: LIN, Yuan-Pei, PHOONG, See-May
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.09.2003
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Applied sciences
Bit error rate
Channels
Design engineering
Digital audio broadcasting
Digital video broadcasting
Discrete Fourier transforms
DSL
Error analysis
Exact sciences and technology
Finite impulse response filter
Fourier transforms
OFDM modulation
Optimization
Orthogonal Frequency Division Multiplexing
Quadrature phase shift keying
Receivers
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transceivers
Transmission and modulation (techniques and equipments)
Transmitters
Wireless networks
OFDM
single carrier
Bit error rate
Multicarrier
Discrete Fourier transformation
Frequency division multiplexing
Information transmission
Optimization
Transceiver
Quadrature phase shift keying
Hadamard matrix
Coding
BER optimal multicarrier
Least mean squares methods
Orthogonal frequency division multipleing
precoded OFDM
ISSN:1053-587X, 1941-0476
Online Access:Get full text
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Summary: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 the signal-to-noise ratio (SNR). For higher SNR, solutions of optimal precoders are the same as those of MMSE receivers.
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ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2003.815391