Multiuser Generalized Detector for Uniformly Quantized Synchronous CDMA Signals in AWGN Channels
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초록
We investigate the multiuser Generalized Detector (GD) which is constructed based on the generalized app- roach to signal processing in noise for uniformly quantized synchronous Code Division Multiple Access (CDMA) signals in the Additive White Gaussian Noise (AWGN) channels of wireless communication system and compare it with the wellknown Minimum Mean-Square Error (MMSE) multiuser receiver with optimum quantizer. The input/output relationship of the quantizer is represented by the gain plus the additive noise mo- del. Based on this model, we derive the weight vector and the output Signal-to-Interference Ratio (SIR) of the multiuser GD. The effects of quantization and sampling of the multiuser GD performance is characterized in a single parameter named ''equivalent noise variance''which is a function of the sum of each active user's Sig- nal-to-Noise Ratio (SNR), processing gain, and the number of quantization and sampling levels. The optimal qu- antizer step size, which maximizes the multiuser GD output SNR, is also determined. Simulation results valida- te the accuracy of our theoretical analysis and confirm a superiority of employment of the multiuser GD in co- mparison with the MMSE multiuser receiver with optimum quantizer.
Abstract
We investigate the multiuser Generalized Detector (GD) which is constructed based on the generalized app- roach to signal processing in noise for uniformly quantized synchronous Code Division Multiple Access (CDMA) signals in the Additive White Gaussian Noise (AWGN) channels of wireless communication system and compare it with the wellknown Minimum Mean-Square Error (MMSE) multiuser receiver with optimum quantizer. The input/output relationship of the quantizer is represented by the gain plus the additive noise mo- del. Based on this model, we derive the weight vector and the output Signal-to-Interference Ratio (SIR) of the multiuser GD. The effects of quantization and sampling of the multiuser GD performance is characterized in a single parameter named ''equivalent noise variance''which is a function of the sum of each active user's Sig- nal-to-Noise Ratio (SNR), processing gain, and the number of quantization and sampling levels. The optimal qu- antizer step size, which maximizes the multiuser GD output SNR, is also determined. Simulation results valida- te the accuracy of our theoretical analysis and confirm a superiority of employment of the multiuser GD in co- mparison with the MMSE multiuser receiver with optimum quantizer.
참고문헌 (15)
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