用于直接序列扩频系统的信道估计算法及改良

对于无线通信接收机设计说，信道估计单元一直是一个关键的模块。在WLAN（无线局域网）接收机的设计中，室内环境下无线信道的复杂性和不可预测性成为系统研究和分析的焦点。如何获得精确的信道估计，从而计算出准确的Rake接收机和均衡器的抽头系数，是关系着整个系统性能的重要因素。介绍了传统信道估计的方法和过程，并针对其缺点展开讨论，并提出了两种改良的信道估计算法。该算法能够大大地缩小估计误差，提高系统性能。

A Channel Estimation Algorithm and its Improvement for DSSS Systems

In the wireless communication demodulator design, channel estimation has always been an important module. In WLAN demodulator design, how to make an accurate estimation of the channel impulse response, especially with the complexity and unpredictability of the indoor wireless channel, is one of the focuses in modern communication system research and analysis. In this paper, a conventional channel estimation method is introduced, its disadvantages are dicussed, and two improved algorithms are proposed for channel estimation. These algorithms can greatly reduce the estimation error, thus improving system perforce.