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Near-far resistance of linear receivers in chip asynchronous CDMA systems with random signatures

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1 Author(s)
Saquib, M. ; Wireless Commun. Res. Lab., Texas Univ., Dallas, TX, USA

This paper examines the robustness of the linear receivers, such as the MMSE and the decorrelating receivers, against the near-far problem in chip asynchronous random DS/CDMA systems. In asynchronous CDMA systems, both of those linear receivers achieve the optimum near-far resistance by employing infinite-bit-long observation windows. We develop simple tight upper and lower bounds on the average optimum near-far resistance. It is shown that the average optimum near-far resistance of the asynchronous system is upper bounded by that of the synchronous system. These bounds converge to the average optimum near-far resistance of the synchronous system as the processing gain and the number of users approach infinity. A simulation study was performed to characterize the average optimum near-far resistance for finite processing gain systems

Published in:

Communications, 2001. ICC 2001. IEEE International Conference on  (Volume:9 )

Date of Conference:

2001