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Title |
Combined ML-MMSE Receiver of an STBC-CDMA System for PSK/QAM Modulation |
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Author |
Radhia Gharsallah, Ridha Bouallegue |
| Citation |
Vol. 7 No. 1 pp. 254-258 |
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Abstract |
This paper presents a Space Time Block Code structure using spread spectrum in multi user context employing code division multiple access (CDMA). This communication system can guarantee full rate full diversity because its based on the famous Alamouti code using two transmit antennas and two receive antennas. The originality of this paper consists on extending the use of ST block codes to a multi user environment. This transmission scheme combines the benefits of both STBC, by taking advantages from spatial and temporal diversity to attend a high data rate, and spread spectrum to avoid Multiple Access Interference in a rayleigh fading channel. Simulation results show that this simple multi user transmit diversity scheme provides considerable performance gains in term of bit error rate. |
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Keywords |
STBC, PSK, QAM, spread spectrum, MAI, ML decoder, Rayleigh fading channel, multi user detection, MMSE |
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