关键词: 多输入多输出正交频分多址接入, 初始测距, 波束成形

Abstract:

According to the feature of multiple antennas at the base station in the MIMO-OFDMA system, a novel initial ranging (IR) method exploiting the beamforming technique is proposed. The beamforming vector of the ranging signal is obtained by searching from the received signal vector of the multiple antennas. The signals received  by multiple antennas are combined by the beamforming vector, and the inter-user interference is suppressed. The combined signals are used in the multiuser detection and timing offsets estimation in the initial ranging. Simulation results show that the miss detection probability and false alarm probability of the multiuser detection by the proposed method are efficiently reduced, and that the performance of parameter estimation by the proposed method is better than that by the available methods.

Key words: MIMO-OFDMA, initial ranging, beamforming