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Novel Space Time Spreading Scheme | ||
| Thi-Qar University Journal for Engineering Sciences | ||
| Article 1, Volume 2, Issue 3, 2011, Pages 35-43 | ||
| Author | ||
| Ahmed Abdel Hadi Fadhel | ||
| Abstract | ||
| 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 in Table 1. Also, the proposed scheme (may be partially) solves the problem of the code reuse. | ||
| Keywords | ||
| Space time spreading; Direct sequence code division multiple access; Layered space time coding; Bit error rate; Flat fading | ||
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