The authors present a random spreading code assignment for enhancing channel efficiency in centralized spread-spectrum packet radio networks which employ a multiple capture receiver for each code channel. Compared to the common code case, this approach requires a modest increased in receiver complexity, but the number of distinct spreading codes being used is considerably less than the number of radios in the network. The capture and throughput performance of the random assignment scheme is evaluated for a proper set of codes, and compared with the theoretical results from the common code scheme. It is shown that the use of a random assignment scheme with more than one code results in a higher performance gain, and most of this gain can be achieved with just two distinct spreading codes.
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