Frequency Sharing CDMA Wireless LAN Using Uplink Band of P-MP TDMA Broadband Wireless Access

Takeo FUJII  Masao NAKAGAWA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E83-B   No.7   pp.1435-1444
Publication Date: 2000/07/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
Keyword: 
wireless LAN,  broadband wireless access,  frequency sharing system,  CDMA,  

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Summary: 
In this paper, we propose a combination system of point to multipoint (P-MP) time division multiple access (TDMA) broadband wireless access (BWA) system and indoor wireless local area network (WLAN). In order to realize a high speed wireless communication, a wide bandwidth is required for both access lines and local area networks. The proposed system shares the frequency between BWA and WLAN to achieve an efficient use of frequency resources. This is based on the idea that an uplink band of the P-MP TDMA BWA system will provide relatively small interference slots, which are not used by subscriber stations nearby. In other words, there are useful small interference slots for another system using same frequency according to its position. Then we use such small interference slots for WLAN. In addition, direct sequence code division multiple access (DS-CDMA) can suppress such TDMA interference by spreading it over 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. To confirm the availability of the proposed system, we evaluate the system performance by numerical analysis and computer simulation.