Fairness of a decentralized RLAN based on asynchronous DS/CDMA

Performance figures are obtained for a decentralized radio local area network (RLAN) based on asynchronous direct-sequence code-division multiple-access (DS/CDMA). Packets are transmitted with equal powers and arrive at the spatially distributed receiver nodes with different power levels. The packet error probability is given for randomly chosen spreading sequences that are periodically repeated from bit to bit. Using these results, the network throughput figures of finite user DS/CDMA-ALOHA are presented for various spatial node distributions. Fairness in terms of equal share for all nodes on the network throughput is not always given. This is documented using the node throughput figures as well as a newly defined measure for the fairness of the network. It is shown, that the fairness can be drastically improved by adjusting the transmitter power according to the distance to the desired receiver