A maximum-likelihood bound approaching minimum bit error rate linear multiuser detector for frequency-selective DS-CDMA systems |
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| Affiliation: | 1. Department of Electrical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Electrical and Electronic Engineering, University Putra Malaysia, 43400 Serdang, Malaysia;1. Department of Electronic Communication Engineering, National Kaohsiung Marine University, Kaohsiung, Taiwan, ROC;2. Institute of Communications Engineering, HTC Corporation, Taipei, Taiwan, ROC;3. Department of Electrical Engineering, Chienkuo Technology University, Taiwan, ROC;1. Department of Electrical Engineering, Faculty of Electrical and Computer Engineering, Yazd University, Safaeieh, Pejouhesh St., P.O. Box 89195-741, Yazd, Iran;2. Department of Electrical and Computer Engineering, Isfahan University of Technology, Iran |
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| Abstract: | In this letter, a minimum bit error rate (MBER) linear multiuser detector (MUD) is considered for direct-sequence code-division multiple-access (DS-CDMA) communication systems, distorted by time-varying and frequency-selective multipath fading channels. Based on the approach for finding filter coefficients of the proposed MBER MUD, an efficient Newton method with a barrier parameter is developed. The BER performance of the MBER MUD is compared to other conventional detectors. The study finds that the proposed MBER MUD has more than 2 dB gain over the linear minimum mean-squared error (LMMSE) detector. Furthermore, in the high SNR region, the BER performance of the proposed MBER MUD approaches the performance of the maximum-likelihood (ML) detector. |
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| Keywords: | Constrained optimization problem Linear multiuser detector Minimum bit error rate Newton's method |
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