Frequency sharing CDMA wireless LAN using uplink band of P-MP TDMA broadband wireless access

Abstract

In this paper, we propose a frequency sharing system between point to multipoint (P-MP) time division multiple access (TDMA) broadband wireless access (BWA) system and indoor wireless local area network (WLAN). The proposed system shares the frequency between BWA and WLAN to achieve an efficient use of the frequency resource. This is based on the idea that an uplink time slot of the P-MP TDMA BWA system will provide relatively small interference if it is not used by subscriber stations nearby. In addition, direct sequence code division multiple access (DS-CDMA) can suppress such TDMA interference by spreading it over a wide bandwidth. Therefore in the proposed system, DS-CDMA is used for WLAN in the same band with the BWA uplink. We also discuss WLAN packet error rate reduction techniques for this system.