Constant Modulus Algorithm with Orthogonal Projection for Adaptive Array Antenna Multiuser Detection

Kazuhiko FUKAWA; Hiroshi SUZUKI; Wenkai SHAO

Constant Modulus Algorithm with Orthogonal Projection for Adaptive Array Antenna Multiuser Detection

Kazuhiko FUKAWA, Hiroshi SUZUKI, Wenkai SHAO

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This paper proposes a new blind algorithm effective for multiuser detection with an adaptive array antenna. The conventional blind algorithm, known as the Constant Modulus Algorithm (CMA), has two major drawbacks: (i) the convergence speed is not sufficiently fast for usual applications in mobile communications, and (ii) the algorithm is very likely to lock on the path with the largest received power, which means the signal with the second largest power can hardly be extracted. This paper introduces the Recursive Least Squares algorithm for CMA (RLS-CMA) in order to speed the convergence up, and additionally introduces the concept of the orthogonal projection into CMA so as to extract signals with weak power. The proposed CMA with Orthogonal Projection (CMA-OP) sequentially calculates the weight vector of each user under a constraint that the weight vector should be orthogonal to the estimated array response vectors of previously extracted users. Computer simulations demonstrate that the proposed scheme can operate properly in the Rayleigh fading channels under the two-user condition.

Publication: IEICE TRANSACTIONS on Communications Vol.E86-B No.1 pp.206-212

Publication Date: 2003/01/01

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Type of Manuscript: Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)

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Kazuhiko FUKAWA, Hiroshi SUZUKI, Wenkai SHAO, "Constant Modulus Algorithm with Orthogonal Projection for Adaptive Array Antenna Multiuser Detection" in IEICE TRANSACTIONS on Communications, vol. E86-B, no. 1, pp. 206-212, January 2003, doi: .
Abstract: This paper proposes a new blind algorithm effective for multiuser detection with an adaptive array antenna. The conventional blind algorithm, known as the Constant Modulus Algorithm (CMA), has two major drawbacks: (i) the convergence speed is not sufficiently fast for usual applications in mobile communications, and (ii) the algorithm is very likely to lock on the path with the largest received power, which means the signal with the second largest power can hardly be extracted. This paper introduces the Recursive Least Squares algorithm for CMA (RLS-CMA) in order to speed the convergence up, and additionally introduces the concept of the orthogonal projection into CMA so as to extract signals with weak power. The proposed CMA with Orthogonal Projection (CMA-OP) sequentially calculates the weight vector of each user under a constraint that the weight vector should be orthogonal to the estimated array response vectors of previously extracted users. Computer simulations demonstrate that the proposed scheme can operate properly in the Rayleigh fading channels under the two-user condition.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/e86-b_1_206/_p

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@ARTICLE{e86-b_1_206,
author={Kazuhiko FUKAWA, Hiroshi SUZUKI, Wenkai SHAO, },
journal={IEICE TRANSACTIONS on Communications},
title={Constant Modulus Algorithm with Orthogonal Projection for Adaptive Array Antenna Multiuser Detection},
year={2003},
volume={E86-B},
number={1},
pages={206-212},
abstract={This paper proposes a new blind algorithm effective for multiuser detection with an adaptive array antenna. The conventional blind algorithm, known as the Constant Modulus Algorithm (CMA), has two major drawbacks: (i) the convergence speed is not sufficiently fast for usual applications in mobile communications, and (ii) the algorithm is very likely to lock on the path with the largest received power, which means the signal with the second largest power can hardly be extracted. This paper introduces the Recursive Least Squares algorithm for CMA (RLS-CMA) in order to speed the convergence up, and additionally introduces the concept of the orthogonal projection into CMA so as to extract signals with weak power. The proposed CMA with Orthogonal Projection (CMA-OP) sequentially calculates the weight vector of each user under a constraint that the weight vector should be orthogonal to the estimated array response vectors of previously extracted users. Computer simulations demonstrate that the proposed scheme can operate properly in the Rayleigh fading channels under the two-user condition.},
keywords={},
doi={},
ISSN={},
month={January},}

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TY - JOUR
TI - Constant Modulus Algorithm with Orthogonal Projection for Adaptive Array Antenna Multiuser Detection
T2 - IEICE TRANSACTIONS on Communications
SP - 206
EP - 212
AU - Kazuhiko FUKAWA
AU - Hiroshi SUZUKI
AU - Wenkai SHAO
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E86-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2003
AB - This paper proposes a new blind algorithm effective for multiuser detection with an adaptive array antenna. The conventional blind algorithm, known as the Constant Modulus Algorithm (CMA), has two major drawbacks: (i) the convergence speed is not sufficiently fast for usual applications in mobile communications, and (ii) the algorithm is very likely to lock on the path with the largest received power, which means the signal with the second largest power can hardly be extracted. This paper introduces the Recursive Least Squares algorithm for CMA (RLS-CMA) in order to speed the convergence up, and additionally introduces the concept of the orthogonal projection into CMA so as to extract signals with weak power. The proposed CMA with Orthogonal Projection (CMA-OP) sequentially calculates the weight vector of each user under a constraint that the weight vector should be orthogonal to the estimated array response vectors of previously extracted users. Computer simulations demonstrate that the proposed scheme can operate properly in the Rayleigh fading channels under the two-user condition.
ER -