Performance of MC-CDMA with pilot code and blind equalization algorithm

Graduation date: 2005Various methods and techniques have been introduced and applied to\ud advance the state of the art of mobile wireless communications technology. For\ud example, some techniques are applied to overcome the problem of multipath caused\ud by the mobile environment. Multipath produces replicas of the wanted signal which\ud arrive at the receiver with different time delays. If not dealt with properly, this\ud environment will greatly deteriorate the quality of the wanted signal. The so-called\ud multiuser feature of many wireless communication systems will also add some\ud interference to the signal of interest.\ud This thesis makes an attempt to improve the performance of wireless\ud communication systems that use either pilot-based or blind equalization techniques\ud to obtain channel side information. Specifically, these techniques are concerned with\ud the estimation of multipath parameters in order to improve system performance. By\ud inserting some pre-defined code which is called a pilot code on each pre-defined\ud segment of a data block, we can recover the signal by pilot-based methods. Using an\ud adaptive method, some knowledge of the channel characteristics and input source,\ud we can achieve acceptable error rate using blind equalization as an alternate solution to pilot-based. Finally, new enhancements are added to blind equalization to improve\ud its performance further