چکیده:
In this paper, we projxise space-time block codes based on constituent intersectant orthogonal designs. After channel model was formulated, we studied tht space-time block codes from constituent intersectant orthogonal designs. At last we made simulations for the space-time block codes from complex orthogonal design and the space-time block codes from constituent intersectant orthogonal design to compare their performance. Compared with space-time block codes from complex orthogonal design when code rate is the same and transmission rate is fixed, space-time block codes from constituent intersectant orthogonal desip via « i»« st antennas can reduce bit error rate and symbol error rate, and these new codes have the same low decoding complexity as the space-time block codes from complex orthogonal designs
خلاصه ماشینی:
Space-Time Block Code, Constituent Intersectant Orthogonal Design, Complex Orthogonal Design, Decoding, Transmit Diversity INTRODUCTION Nowadays, since the third generation mobile communication system requires much higher quality of speech than the current cellular mobile communication system and requires up to 2 Mbils/s high bit rate data service, more and more attention has been paid to transmit diversity of space-time coding.
Rate I space-time block codes from constituent intersectant orthogonal design exist for two, three and four transmit antennas while space-time block codes from complex orthogonal design exist only for two transmit antennas.
Rate 3/4 space-time block codes from constituent intersectant orthogonal design exist for five, six, seven and eight transmit antennas while space-time block codes from complex orthogonal design exist only for three and four transmit antennas.
Theorem: Space-time block codes based on constituent intersectant orthogonal design of rate 1 of size n exists if and only if n = 2, 3 or 4.
Similarly, space-time block codes based on constituent intersectant orthogonal design of rate 3/4 of size o exists if and only if n = 5, 6, 7 or 8.
Rate l space-time block codes from constituent intersectant orthogonal design exist for two, three and four transmit antennas while space-time block codes from July/December, 2004 Iranian Journal of Information Science & Technology, Volume 2, Number 2 complex orthogonal design exists oaly for two transmit antennas.
Rate 3 '4 space-time block codes from constituent intersectant orthogonal design exist for five, six, scvcn and eight transmit antennas while space-time block codes from complex orthogonal design exist only for three and four transmit antennas.