TY - JOUR ID - TI - Novel Space Time Spreading Scheme AU - Ahmed Abdel Hadi Fadhel PY - 2011 VL - 2 IS - 3 SP - 35 EP - 43 JO - University of Thi-Qar Journal for Engineering Sciences مجلة جامعة ذي قار للعلوم الهندسية SN - 26645564 26645572 AB - In this paper two spreading schemes and their detection methods were proposed and compared. The comparison depends on the performance of each scheme in Rayleigh flat fading channel. Space Time Spreading (STS) codes are used with Layered Space Time Codes (LST), with Vertical Bell Laboratories Space Time codes (V-BLAST) in particular. Also,Direct Sequence Code Division Multiple Access system (DS-CDMA) was used as a multiuser criterion.As a result of this spreading,a simple decoding algorithm was used.The simulation shows that STS-LST-DS-CDMA system with 3TX-3RX (3transmitting antennas3 receiving antennas) using all paths between ransmitter and receiver was better than LSTDS-CDMA system by about 4dB in SNR at BER of 10 -4 . More detailed results are shown inTable 1. Also, the proposed scheme (may be partially) solves the problem of the code reuse.

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