Antenna Selection Based Initial Ranging Method for IEEE 802.16m MIMO-OFDMA Systems

An antenna selection based initial ranging method is proposed in orthogonal frequency division multiple access (OFDMA) networks with multiple-input multiple-output (MIMO) for IEEE 802.16m standard. In the proposed scheme, the initial ranging signal processing is selected by the antenna selection at the base station, where the receive antenna with the largest received signal-to-interference-and-noise ratio (SINR) is chosen. The active initial ranging users and the timing offset estimation can easily obtain by means of the adaptive threshold. Simulation results show that the proposed initial ranging scheme can achieve a much better initial ranging performance than the noncoherent antenna combining method, and dramatically improve the initial ranging efficiency for a large number of active RSSs simultaneously to access into networks. Key-Words: orthogonal frequency division multiple access (OFDMA); initial ranging; antenna selection (AS); multiple-input multiple-output (MIMO); IEEE 802.16