Space-time equalization and interference cancellation with convolutional coding for MIMO OFDM

Future broadband cellular wireless communication systems will be characterized by high delay spread and the need to maximize the system capacity. Aggressive frequency reuse, one technique of maximizing capacity, subjects the mobile to high levels of interference when the mobile is near the cell edge. Traditional interference suppression techniques designed for synchronized OFDM systems do not perform optimally when the desired and interfering signals are asynchronous at the receiver. Methods of time aligning asynchronous signals (i.e., signals whose channel plus delay is longer than the cyclic prefix length) were recently presented (Breinholt, M. et al., Allerton, 2002). This paper presents results of the synchronization algorithms for coded systems. The results show that the algorithms give significantly different results when coding is applied.