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Diversity reception in short-code CDMA

Diversity reception in short-code CDMA

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Short spreading sequences facilitate efficient multiuser detectors and have hence been incorporated into practical code division multiple access systems such as 3rd Generation Partnership Project UTRA-TDD. However, as the number of users approaches the spreading code length, the asymptotic performance and the numerical stability of linear multiuser detection algorithms degrade. Given some simplifications such as synchronous users, it is shown that receive diversity effectively mitigates these degradations and allows the system to be operated with a high load. A lower bound on the mean asymptotic multiuser efficiency is presented and the numerical stability of linear multiuser detection algorithms for systems with receive diversity is analysed. It is further shown that the performance variability is significantly reduced by receive diversity.

Inspec keywords: diversity reception; numerical stability; code division multiple access; sequences; multiuser detection

Other keywords: short spreading code sequences; linear multiuser detection; code division multiple access system; diversity reception; mean asymptotic multiuser efficiency; numerical stability; CDMA

Subjects: Signal detection; Multiple access communication; Radio links and equipment; Other numerical methods

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