Multistage semi-blind adaptive multiuser detector for reverse link in CDMA systems
ICC（2001）
摘要
We develop a novel multistage semiblind multiuser detection technique for the reverse link in direct sequence (DS) code-division multiple access (CDMA) systems. This approach fully utilizes all known users' information, performs interference cancellation (IC) to suppress the interferers within the cell, and exploits a blind adaptive decision-directed (DD) MMSE detector to suppress the inter-cell interference. This process can be made iterative and in the multistage process, the tentative decision bits from DD-MMSE detectors can be fed back to the IC part to make interference regeneration more accurate. A simplified adaptive algorithm for this multistage semi-blind detectors is designed. Two upper bounds for the signal-to-noise-interference ratio (SIR) of the multistage semiblind detector are derived. It is shown that the proposed detector has a significant performance gain over that of the pure blind detectors and the non-blind detectors. The tracking capability of the proposed semi-blind detector in a dynamic environment is examined with simulations
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关键词
adaptive signal detection,sir,multiuser channels,multistage semiblind multiuser detection,blind adaptive decision-directed mmse detector,blind detector,radio links,interference regeneration,dynamic environment,performance gain,radiofrequency interference,iterative process,direct sequence code-division multiple access,reverse link,cellular radio,radio tracking,multistage process,dd-mmse detectors,adaptive algorithm,nonblind detector,inter-cell interference,spread spectrum communication,ds-cdma systems,least mean squares methods,tracking,code division multiple access,simulations,interference suppression,multistage semi-blind adaptive multiuser detector,interference cancellation,signal detection,signal-to-noise-interference ratio,upper bounds,detectors,algorithm design and analysis,upper bound
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