Chip-interleaved block-spread code division multiple access

Shengli Zhou; Georgios B. Giannakis; Christophe Le Martret

doi:10.1109/26.983320

Chip-interleaved block-spread code division multiple access

Shengli Zhou, Georgios B. Giannakis, Christophe Le Martret

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

154 Scopus citations

Abstract

A novel multiuser-interference (MUI)-free code division multiple access (CDMA) transceiver for frequency-selective multipath channels is developed in this paper. Relying on chip-interleaving and zero padded transmissions, orthogonality among different users' spreading codes is maintained at the receiver even after frequency-selective propagation. As a result, deterministic multiuser separation with low-complexity code-matched filtering becomes possible without loss of maximum likelihood optimality. In addition to MUI-free reception, the proposed system guarantees channel-irrespective symbol detection and achieves high bandwidth efficiency by increasing the symbol block size. Filling the zero-gaps with known symbols allows for perfectly constant modulus transmissions. Important variants of the proposed transceivers are derived to include cyclic prefixed transmissions and various redundant or nonredundant precoding alternatives. (Semi-) blind channel estimation algorithms are also discussed. Simulation results demonstrate improved performance of the proposed system relative to competing alternatives.

Original language	English (US)
Pages (from-to)	235-248
Number of pages	14
Journal	IEEE Transactions on Communications
Volume	50
Issue number	2
DOIs	https://doi.org/10.1109/26.983320
State	Published - Feb 2002

Bibliographical note

Funding Information:
Paper approved by W. A. Krzymien, the Editor for Multicarrier and Spread Spectrum Systems of the IEEE Communications Society. Manuscript received August 31, 2000; revised June 9, 2001. This work was supported by the National Science Foundation under Wireless Initiative Grant 99-79443 and NSF Grant 0105612. This paper was presented in part at the 38th Allerton Conference, University of Illinois at U-C, Monticello, IL, October 4–6, 2000, and at the 35th Conference on Information Sciences and Systems, the Johns Hopkins University, Baltimore, March 21–23, 2001.

Keywords

Block spreading
Channel estimation
Chip inter-leaving
Code division multiple access (CDMA)
Multipath
Multiuser interference

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10.1109/26.983320

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title = "Chip-interleaved block-spread code division multiple access",

abstract = "A novel multiuser-interference (MUI)-free code division multiple access (CDMA) transceiver for frequency-selective multipath channels is developed in this paper. Relying on chip-interleaving and zero padded transmissions, orthogonality among different users' spreading codes is maintained at the receiver even after frequency-selective propagation. As a result, deterministic multiuser separation with low-complexity code-matched filtering becomes possible without loss of maximum likelihood optimality. In addition to MUI-free reception, the proposed system guarantees channel-irrespective symbol detection and achieves high bandwidth efficiency by increasing the symbol block size. Filling the zero-gaps with known symbols allows for perfectly constant modulus transmissions. Important variants of the proposed transceivers are derived to include cyclic prefixed transmissions and various redundant or nonredundant precoding alternatives. (Semi-) blind channel estimation algorithms are also discussed. Simulation results demonstrate improved performance of the proposed system relative to competing alternatives.",

keywords = "Block spreading, Channel estimation, Chip inter-leaving, Code division multiple access (CDMA), Multipath, Multiuser interference",

author = "Shengli Zhou and Giannakis, {Georgios B.} and {Le Martret}, Christophe",

note = "Funding Information: Paper approved by W. A. Krzymien, the Editor for Multicarrier and Spread Spectrum Systems of the IEEE Communications Society. Manuscript received August 31, 2000; revised June 9, 2001. This work was supported by the National Science Foundation under Wireless Initiative Grant 99-79443 and NSF Grant 0105612. This paper was presented in part at the 38th Allerton Conference, University of Illinois at U-C, Monticello, IL, October 4–6, 2000, and at the 35th Conference on Information Sciences and Systems, the Johns Hopkins University, Baltimore, March 21–23, 2001.",

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N2 - A novel multiuser-interference (MUI)-free code division multiple access (CDMA) transceiver for frequency-selective multipath channels is developed in this paper. Relying on chip-interleaving and zero padded transmissions, orthogonality among different users' spreading codes is maintained at the receiver even after frequency-selective propagation. As a result, deterministic multiuser separation with low-complexity code-matched filtering becomes possible without loss of maximum likelihood optimality. In addition to MUI-free reception, the proposed system guarantees channel-irrespective symbol detection and achieves high bandwidth efficiency by increasing the symbol block size. Filling the zero-gaps with known symbols allows for perfectly constant modulus transmissions. Important variants of the proposed transceivers are derived to include cyclic prefixed transmissions and various redundant or nonredundant precoding alternatives. (Semi-) blind channel estimation algorithms are also discussed. Simulation results demonstrate improved performance of the proposed system relative to competing alternatives.

AB - A novel multiuser-interference (MUI)-free code division multiple access (CDMA) transceiver for frequency-selective multipath channels is developed in this paper. Relying on chip-interleaving and zero padded transmissions, orthogonality among different users' spreading codes is maintained at the receiver even after frequency-selective propagation. As a result, deterministic multiuser separation with low-complexity code-matched filtering becomes possible without loss of maximum likelihood optimality. In addition to MUI-free reception, the proposed system guarantees channel-irrespective symbol detection and achieves high bandwidth efficiency by increasing the symbol block size. Filling the zero-gaps with known symbols allows for perfectly constant modulus transmissions. Important variants of the proposed transceivers are derived to include cyclic prefixed transmissions and various redundant or nonredundant precoding alternatives. (Semi-) blind channel estimation algorithms are also discussed. Simulation results demonstrate improved performance of the proposed system relative to competing alternatives.

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Chip-interleaved block-spread code division multiple access

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