Summary
International Symposium on Antennas and Propagation
2006
Session Number:3A2a
Session:
Number:3A2a-2
On Downlink Space Division Multiplexing in Partial Cooperation Multiple Access Point Systems
Riichi Kudo, Yasushi Takatori, Atsushi Ohta, Kentaro Nishimori, Shuji Kubota,
pp.1-5
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
It is well-known that multiple input multiple output (MIMO) systems increase the channel capacity so they are very attractive for future high data rate wireless access systems. To further increase the channel capacity possible with MIMO techniques, more antenna branches are required in both of the access point (AP) and the mobile station (MS). However, because of the non-uniform multipath distribution seen in actual environments, the channel capacity improvement may saturate against the number of antenna branches. To overcome these problems, the distributed wireless communication system which has multiple APs and an access controller (AC) has been proposed. In this paper, we consider the partial cooperation system that multiple APs are synchronized in terms of time but not in terms of phase. The AC is used to determine both the number of spatial channels at each AP and the transmission modes in the spatial channels. This system allows the transmission data rate to increase by installing more APs although frequency synchronization is not required among APs. Its effectiveness is clarified by computer simulations in Rayleigh and Ricean fading environments.