2 June 2005 Rake receiver performance in the presence of narrowband jamming
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Abstract
Direct-sequence spread spectrum (DSSS) modulation offers many properties that make it well suited for a mobile environment including some inherent narrowband interference or jamming (NBJ) suppression capability and resistance to multipath fading. The estimation and filtering of unwanted narrowband signals in DSSS systems has been extensively addressed in previous work but has given limited insight to system performance when multipath fading is introduced and a diversity solution such as the ubiquitous Rake receiver is implemented. In this case, multiple correlators (or fingers) are used to extract the desired signal replicas from the individual delay path components. For the maximum ratio combiner (MRC) version of the Rake receiver, the signal replicas from each finger are then combined in some weighted sense to formulate the final decision threshold. The focus of this study is twofold: to investigate the inaccuracies incurred on path delay estimation due to the presence of NBJ and its impact on the system Bit Error Rate (BER). In order to reduce the impact of NBJ, some adaptive NBJ suppression filters are suggested.
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Julian Meng, Julian Meng, Xin Ding, Xin Ding, } "Rake receiver performance in the presence of narrowband jamming", Proc. SPIE 5819, Digital Wireless Communications VII and Space Communication Technologies, (2 June 2005); doi: 10.1117/12.603378; https://doi.org/10.1117/12.603378
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