Performance of DS-CDMA protocols in wireless LANs
Mital Parikh, Prachee Sharma, Rahul Dev Garg, Kavitha Chandra, Charles Thompson · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2002
The performance of direct-sequence code-division multiple access (DS-CDMA) systems in indoor wireless channels is presented. TCP traffic, channel noise and signal characteristics are measured using commercial products that implement the IEEE 802.11b DS-CDMA standard. The measured throughputs for a low density mobile network are typically around $4.2$ Mbps when one of the two end-systems is on the wired segment. Multipath interference is shown to contribute to significant degradation in TCP performance. Packet loss rates ranging from $0.02$ to $0.2$ percent are observed in line-of-sight conditions. The BER performance of DS-CDMA is estimated using an image source based channel model of the rectangular room to compute the spatial variation of the channel impulse response. These impulse responses provide a quantitative measure of the system performance and provide estimates of signal power levels required for supporting high data rates in channels influenced by multipath interference.