Suboptimal precoder design for BS-CDMA systems using Chu sequences as the spreading codes

In this paper, we consider block spread code division multiple access (BS-CDMA) systems using Chu sequences as the spreading codes, namely the Chu-BS-CDMA systems, and study the percoder design for such systems. We show that Chu-BS-CDMA using the conventional zero-padding precoder and minimum mean s...

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Published in:Proceedings of 2011 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing pp. 310 - 315
Main Authors: Yue Wang, Coon, J.
Format: Conference Proceeding
Language:English
Published: IEEE 01.08.2011
Subjects:
Complexity theory
Decoding
Detectors
Discrete Fourier transforms
Matrix decomposition
Receivers
Transmitters
ISBN:9781457702525, 1457702525
ISSN:1555-5798
Online Access:Get full text
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Abstract In this paper, we consider block spread code division multiple access (BS-CDMA) systems using Chu sequences as the spreading codes, namely the Chu-BS-CDMA systems, and study the percoder design for such systems. We show that Chu-BS-CDMA using the conventional zero-padding precoder and minimum mean squared error (MMSE) detector yields an inferior performance, while that using the existing optimal S-precoder with successive detection yields a substantial performance gain with a high computational complexity. To combat the disadvantages occurred in the aforementioned two types of precoders, we propose in this paper a novel suboptimal precoder design, where Chu-BS-CDMA using the proposed precoder and decoder and successive detection is shown to achieve a performance comparable to that using the optimal S-precoder, while offering a much reduced complexity. In particular, the design of optimal S-precoder requires channel state information (CSI) and iterative eigen-value decompositions at the transmitter, while the proposed precoder and decoder design does not.
AbstractList In this paper, we consider block spread code division multiple access (BS-CDMA) systems using Chu sequences as the spreading codes, namely the Chu-BS-CDMA systems, and study the percoder design for such systems. We show that Chu-BS-CDMA using the conventional zero-padding precoder and minimum mean squared error (MMSE) detector yields an inferior performance, while that using the existing optimal S-precoder with successive detection yields a substantial performance gain with a high computational complexity. To combat the disadvantages occurred in the aforementioned two types of precoders, we propose in this paper a novel suboptimal precoder design, where Chu-BS-CDMA using the proposed precoder and decoder and successive detection is shown to achieve a performance comparable to that using the optimal S-precoder, while offering a much reduced complexity. In particular, the design of optimal S-precoder requires channel state information (CSI) and iterative eigen-value decompositions at the transmitter, while the proposed precoder and decoder design does not.
Author Yue Wang
Coon, J.
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  organization: Telecommun. Res. Lab. (TRL), Toshiba Res. Eur. Ltd., Bristol, UK
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Snippet In this paper, we consider block spread code division multiple access (BS-CDMA) systems using Chu sequences as the spreading codes, namely the Chu-BS-CDMA...
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StartPage 310
SubjectTerms Complexity theory
Decoding
Detectors
Discrete Fourier transforms
Matrix decomposition
Receivers
Transmitters
Title Suboptimal precoder design for BS-CDMA systems using Chu sequences as the spreading codes
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