TY - GEN
T1 - Performance of multicarrier and multirate CDMA
T2 - 43rd Annual Allerton Conference on Communication, Control and Computing 2005
AU - Guo, Dongning
PY - 2005
Y1 - 2005
N2 - It has been shown that a CDMA fading channel followed by a generic multiuser detection front end essentially decouples into a bank of Gaussian single-user channels in the large-system limit. This paper extends the decoupling result to multicarrier (MC) CDMA and multirate CDMA. In MC-CDMA, frequency-selective fading and equal-rate users are considered. In multirate CDMA, flat fading is assumed, while users may employ a combination of adaptive modulation, variable spreading factor, and multicode schemes to support different data rates. Using statistical physics techniques, it is found that the decoupling principle still holds in both scenarios, i.e., each user experiences an equivalent single-user Gaussian channel, where the degradation in the SNR, known as the multiuser efficiency, is obtained analytically by solving a set of joint equations. The results apply to optimal multiuser detectors as well as many well-know suboptimal detectors.
AB - It has been shown that a CDMA fading channel followed by a generic multiuser detection front end essentially decouples into a bank of Gaussian single-user channels in the large-system limit. This paper extends the decoupling result to multicarrier (MC) CDMA and multirate CDMA. In MC-CDMA, frequency-selective fading and equal-rate users are considered. In multirate CDMA, flat fading is assumed, while users may employ a combination of adaptive modulation, variable spreading factor, and multicode schemes to support different data rates. Using statistical physics techniques, it is found that the decoupling principle still holds in both scenarios, i.e., each user experiences an equivalent single-user Gaussian channel, where the degradation in the SNR, known as the multiuser efficiency, is obtained analytically by solving a set of joint equations. The results apply to optimal multiuser detectors as well as many well-know suboptimal detectors.
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M3 - Conference contribution
AN - SCOPUS:84962053069
T3 - 43rd Annual Allerton Conference on Communication, Control and Computing 2005
SP - 1036
EP - 1045
BT - 43rd Annual Allerton Conference on Communication, Control and Computing 2005
PB - University of Illinois at Urbana-Champaign, Coordinated Science Laboratory and Department of Computer and Electrical Engineering
Y2 - 28 September 2005 through 30 September 2005
ER -