EFFECT OF WIRELESS LINK CHARACTERISTICS ON PACKET-LEVEL QOS IN CDMA CSMA NETWORKS/

In this paper, me analyze the effect of wireless link characteristics on throughput, packet delay, and packet loss rate in code-division mul tiple-access (CDMA) networks using carrier-sense multiple-access (CSMA ) protocols. Although CSMA protocols are being extensively considered for applications in wireless networks, there is no comprehensive analy sis of the effect of the link characteristics on packet level QoS, In our paper, link parameters are incorporated into the analysis through the probability of correct channel sensing, the probability of packet correct demodulation, and the channel fading rate. Although the imperf ect channel sensing degrades the system performance, the analysis demo nstrates that the CSMA IA system outperforms ALOHA even if the probabi lity of incorrect channel sensing is higher than 10(-1). A number of n umerical results quantitatively illustrates the impact of the channel fading rate and spatial correlation of the fading on packet level QoS, These results can be used for practical network design.