Power considerations for DS/CDMA personal communication systems (PCS)

Spread-spectrum direct sequence/code division multiple access (DS/CDMA) is a promising technique for personal communication systems (PCS) because of its superiority over both FDMA and TDMA. However, DS/CDMA suffers from the near-far problem. Thus, adaptive power control (APC) of the transmitted signal is needed to perform at reasonable efficiency. This requires the simultaneous recording of the performance degradation caused by multipath fading and interference from other users. A model for the DS/CDMA PCS is studied in a Nakagami fading channel, and the probability of error at the base station, along with its upper bounds is evaluated. The results will aid in designing effective and sufficient adaptive power control schemes, and in evaluating the required amount of power needed by each portable set to achieve a reasonable quality in the received signal.<
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