The Rake Receiver Principle: Past, Present and Future
Konstantinos B. Baltzis.
In order to enhance the performance of wireless communication systems, we usually employ diversity combining techniques. Rake reception is a diversity method that gained popularity mainly due to its use in second and third generation mobile systems. This paper reviews important and recent advances in rake diversity and its applications in wireless communications. First, we provide some theoretical background of rake reception focusing on the initial idea proposed in the late 50s. Next, we present selected patent and scientific literature on rake receiver design. Recent patents, patent applications and scientific articles on the application of rake diversity in code division multiple access systems, ultrawideband communications and channel estimation are then discussed. Some more general applications of rake reception in wireless communications are also examined. Future perspectives of rake diversity are finally explored.
Keywords: CDMA, channel estimation, diversity, rake, receiver, ultra-wideband, wireless communications, TDL rake receiver model, Postdetection diversity, UWB Systems
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