Interference cancellation and suppression in asynchronous cooperating base station systems
Smart Antennas（2012）
摘要
We consider cooperating base station systems where the users are not aligned in time and frequency to the core network as it is actually desired for coherent joint signal processing. As it is widely known, time and frequency offsets can cause inter-symbol as well as inter-carrier interference in OFDM systems which leads to a reduced transmission performance. In this paper we investigate uplink joint detection algorithms which, in addition to multi-user interference cancellation, reduce the asynchronous interference by using iterative interference cancellation as well as mitigating the additional interference by exploiting spatial diversity. The structure of the asynchronous interference in frequency domain can be exploited to derive algorithms with scalable complexity. As will be seen, particularly the interference suppression algorithm provides very good performance results with only a moderate complexity increase.
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关键词
OFDM modulation,communication complexity,cooperative communication,diversity reception,frequency-domain analysis,intercarrier interference,interference suppression,intersymbol interference,iterative methods,multiuser detection,signal processing,OFDM systems,asynchronous cooperating base station systems,asynchronous interference,coherent joint signal processing,core network,frequency domain,frequency offsets,intercarrier interference,interference suppression algorithm,intersymbol interference,iterative interference cancellation,multiuser interference cancellation,scalable complexity,spatial diversity,time offsets,transmission performance,uplink joint detection algorithms
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