Optimal space-time block codes for CDMA systems
- 11 November 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 1, 387-391
- https://doi.org/10.1109/milcom.2000.904981
Abstract
Space-time block codes have been well-addressed for single-user systems in recent works, the counterpart for CDMA systems will be discussed in this paper. A general system model is presented, the Chernoff bound for quasi-static channel is derived. Based on the Chernoff bound, performance criteria are obtained: diversity gain and coding grain. The coding gain is shown to be the same coding gain for a single-user system plus the effect of spreading, which essentially provides more coding gain than a narrowband system. Optimal 2-by-2 space-time block codes for the BPSK constellation are provided, and their performance as a function of correlation is investigated. It is observed that unitary codes do not necessarily achieve best performance. To this end, a non-unitary code for and BPSK constellation is supplied, which outperforms unitary codes for both spread and single-user systems. Performance analysis via numerical integration is discussed.Keywords
This publication has 8 references indexed in Scilit:
- On the spectral efficiency of space-time spreading schemes for multiple antenna CDMA systemsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Space-time coding over a code division multiple access systemPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Differential space-time modulationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Signal design for transmitter diversity wireless communication systems over Rayleigh fading channelsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Space-time codes for high data rate wireless communication: performance criterion and code constructionIEEE Transactions on Information Theory, 1998
- A simple transmit diversity technique for wireless communicationsIEEE Journal on Selected Areas in Communications, 1998
- Design and analysis of transmitter diversity using intentional frequency offset for wireless communicationsIEEE Transactions on Vehicular Technology, 1997
- Geometrically uniform codesIEEE Transactions on Information Theory, 1991