Cross-layer Design for MIMO Systems with Space-time Coding in Ricean Fading Channels

• 1、Department of Information and Communication Engineering, Nanjing University of Aeronautics and Astronautics

Abstract：In this paper, a cross-layer design (CLD) scheme for space-time coded MIMO systems over Ricean fading channel is presented by combining adaptive modulation and automatic repeat request, and the corresponding system performance is investigated. The fading gain value is partitioned into a number of regions by which the modulation is adapted in terms of the region the fading gain falls in. The fading gain switching thresholds subject to a target packet error rate (PER) are derived. According to these results, and using the generalized Marcum Q-function, we derive the theoretical formulae of the average PER and spectrum efficiency (SE) of the system with CLD in detail. As a result, closed-form expressions for average PER and SE are obtained for MIMO systems. These expressions include some existing expressions in Rayleigh channel and single antenna Ricean channel as special cases, and avoid summing from zero to infinity of existing expressions. With these expressions, the perfomance of multi-antenna system with CLD in Ricean channel is evaluated effectively. Computer simulation for average PER and SE show that the theoretical analysis and simulation are consistent, which testifies the validity of the derived theoretical formulae. The results show that the system performance will be effectively improved as Ricean factor increases.

keywords： Communicaiton and information system Cross-layer design Space-time coding Ricean fading MIMO Adaptive modulation

点击查看论文中文信息

点击收起