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Enhancing data throughput using quasi-orthogonal functions aggregation for 3G CDMA systems | IEEE Conference Publication | IEEE Xplore

Enhancing data throughput using quasi-orthogonal functions aggregation for 3G CDMA systems


Abstract:

The forward link of an IS-2000 CDMA system may become Walsh code limited under certain scenarios. To enhance the capacity in such scenarios, alternative sets of orthogona...Show More

Abstract:

The forward link of an IS-2000 CDMA system may become Walsh code limited under certain scenarios. To enhance the capacity in such scenarios, alternative sets of orthogonal functions called the quasi-orthogonal functions (QOF), which possess optimal minimax cross correlation with Walsh code sets of variable length, have been incorporated in IS-2000. We discuss a method of significantly enhancing the maximum throughput in evolutions of IS-2000 systems. This method uses aggregation of multiple quasi-orthogonal functions with a relatively smaller constellation alphabet size for a single user with a joint multi-channel detector. This method is compared with the alternative method for enhancing the maximum throughput using aggregation of a relatively smaller number of Walsh functions, but with a higher constellation alphabet size (multi-level modulation). Discussions on the trade-offs and recommendations as to the better method for enhancing the throughput in evolutions of IS-2000/3G systems are then provided.
Date of Conference: 06-09 May 2002
Date Added to IEEE Xplore: 07 August 2002
Print ISBN:0-7803-7484-3
Conference Location: Birmingham, AL, USA

References

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