No abstract

The low bandwidth and high error rates of the wireless channel make joint source-channel coding desirable for optimizing resource usage. We argue that a mechanism for providing variable quality of service (QOS) is essential for joint source-channel coding, and show that its implementation by way of power control is a natural choice for CDMA. Present-day power control techniques focus on controlling inteflerence. In this work, we present a power control algorithm which simultaneously minimizes interference and provides variable QOS contracts for dinerent traffic types in a CDMA system. The algorithm accommodates different QOS requirements by assigning diffkent power levels to each traffic type, and can add or drop connections dynamically while ensuring that QOS specijkations are satigied. Both the uplink and downlink are analyzed, and the scheme is statistically formulated to handle variable-rate traffic.

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This paper derives the BER in synchronous (downlink) indoor direct-sequence CDMA transmission over a Ricean mitltipath channel with a non-iiniform delay profile. Computational results will show that the perfornlarice is miich better than that predicted by models which assrtnie that all resolvable paths have i.i.d. power.

No abstract