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On the coding-spreading tradeoff and intra-cell frequency planning in uplink CDMA systems

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2 Author(s)
A. Khisti ; Sional Inf. & Algorithms Lab., MIT, Cambridge, MA, USA ; M. Trott

We study potential gains in the spectral efficiency of multi-cell uplink CDMA systems that accrue from assigning users in different parts of a cell to different frequency bands. We develop a criterion that enables a fair comparison with a conventional (non-partitioned) system. Two design scenarios are considered: (i) each user requires a fixed data rate; (ii) each user has a fixed SNR. We show that in both scenarios there is a gain in spectral efficiency - regardless of the particular partitioning strategy employed f an MMSE receiver is used. There is no gain if a decorrelator or a matched filter receiver is used. We validate our results through numerical simulations and provide an intuitive explanation based on the coding-spreading tradeoff.

Published in:

Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE  (Volume:1 )

Date of Conference:

29 Nov.-3 Dec. 2004