【作者】 侯晶晶；

【导师】 张辉；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2002， 硕士

【摘要】 Rake接收机是CDMA系统中实现多径分集接收的核心部件，它可以分辨出接收信号中不同的多径分量，克服多径衰落，提高系统性能。 在CDMA扩频通信系统中降低接收功率可以提高系统容量，因此在系统设计和信号处理过程中，大量工作就主要集中在降低接收功率上。 论文重点考虑设计一种3G接收设备中低功耗的Rake接收机结构。我们用结构变换的方法对Rake接收机中Rake手指的实现设计了一种新的硬件结构。该结构完成的算法与传统的Rake结构是一样的，因此对给定的输入信号，它们的输出信号是一样的。结果表明，如果在cdma2000标准中使用这种结构，将会极大的降低接收机的功耗，这种结构用于其它的CDMA标准中也不失为一种好方法，例如WCDMA。更多还原

【Abstract】 In Code Division Multiple Access (CDMA) systems, Rake receiver is the core parts which use several base-band correlators to individually process several signal multi-path components. It can distinguish multi-path from received signals, overcome multi-path fading and achieve improved communications reliability and performance.In CDMA spreading systems, much work in system design and signal processing has been focused on lowering the required received power (e.g. [5]) mainly because, lower required received power leads to higher system capacity.In this paper, we concentrate on the low power architecture design for the Rake receiver inside the 3rd generation mobile communication system, namely 3G. Transformation is carried out for designing new hardware architectures for the implementation of the Rake finger in the Rake receiver. In particular, algorithmic transformation is done on the Rake finger to reduce the operation frequency of the complex operations. In the cases, the new architectures implement the same calculation as the traditional architectures and hence give exactly the same output for a given input. Experimental results show that significant power reduction is achieved when the proposed architectures are used for cdma2000 standard. Similar power reduction is expected if the architectures are employed for other CDMA standards such as WCDMA.更多还原