On SDMA Transmission Considering an Efficient IP Based IEEE 802.16 Relay Station

Broadband wireless networking is a rapidly evolving research field supported both by industry and academy. The IEEE 802.16 protocol family represents a prominent related technology offering significant advantages in terms of meeting the ever increasing application demands. On the other hand space division multiple access (SDMA) transmission techniques provide considerably increased spectral efficiency and flexibility. In this paper an attempt is made to combine these two areas into two schemes presented and evaluated assuming SDMA transmission through a proposed efficient relay station model implementing relay at IP layer. An important aspect of this paper is focusing on critical aspects of a relay system such as, implementation feasibility and efficiency while preserving backwards compatibility. The main objectives of these schemes are to extend coverage area through an efficient relay scheme as well as enhance cell capacity through MAC based cooperative communication.