Space-Time Block Coding for Time Slotted CDMA Systems with Frequency-Selective Fading  

作　　者：WANGYingmin YIKechu NIUZhongxia TIANHongxin 

机构地区：[1]StateKeyLaberatoryofISN,XidianUniversity,Xi＇an710071,China [2]InformationEngineeringUniversity,Zhengzhou450002,China [3]StateKeyLaberatoryofISN,XidianUniversity,Xi＇an710071,China

出　　处：《Chinese Journal of Electronics》2003年第4期626-629,共4页电子学报（英文版）

摘　　要：The radio channel fading is one of the most important physical limitations for wireless mobile communications. Space-time coding is a coding technique that is designed for use with multiple transmit antennas and offers an effective transmit diversity technique to combat fading. However, most existing space-time coding schemes assume fiat fading that may not be valid for wideband wireless mobile communication channels. In this paper, a novel spacetime block coding scheme based on block processing is proposed for time slotted CDMA systems with frequencyselective fading. In order to get quasi-orthogonality, we encode the information based on the two data fields (blocks) of a burst, other than the symbols in a data field (block). As a consequence, it is convenient for block processing of joint detection which can be used with just some small modifications of the algorithms with no space-time coding. For decoding the new space time codes, block linear joint detection algorithms are developed. Then, we simplify these algorithms with an iterative procedure. With moderate iterative times, the computation complexity of the simplified algorithms is much less than that of the exact algorithms. Simulation results show that the performance of the simplified joint detection algorithms approximates to that of the exact ones.

关 键 词：CDMA网络 选择性频率衰减 无线移动通信 空时域编码技术 接点检测 

分 类 号：TN929.533[电子电信—通信与信息系统] TN911.22[电子电信—信息与通信工程]