Signal detection for MIMO-OFDM systems with time offsets

Abstract

In this paper, signal detection for MIMO-OFDM systems operating on quasi-static frequency selective fading channels with time offsets is considered. A channel equalizer is first proposed to cancel most inter-block and inter-symbol interferences, based on second order statistics of the received signals. The transmitted signals are then detected from the equalizer output with the aid of a few pilot symbols. In most scenarios, the number of pilot symbols required here is less than that required in the existing algorithms. In addition, perfect time synchronization, time offset and channel length estimations are not needed. The algorithm is applicable irrespective of whether the channel length is shorter than, equal to or longer than the cyclic prefix (CP) length. Simulations confirm the effectiveness of the proposed algorithm and verify its robustness against time offsets, namely, different time delays for different users. © 2006 IEEE.