Mehmet Gurelli

Performance of fixed wireless access with cdma2000 1xEV-DO

Fixed and portable wireless Internet access is becoming an important segment for the wireless industry. 1xEV-DO, also known as IS-856, has been designed to offer increased user experience and high capacity packet data services on cdma2000 networks. The initial set of 1xEV-DO performance results in the literature has focused on mobile environments. In this paper, we address some of the fixed wireless aspects and the corresponding impacts on system performance. A network level simulation of both forward and reverse links including physical and MAC layer details of 1xEV-DO is used to quantify performance. In addition to average throughput per sector, we quantify the user performance on both links as a function of total attenuation. This provides insight on how performance varies within the coverage area - a very important aspect for fixed access. Moreover, we also show how different forward link data schedulers can be used to tradeoff system capacity for a more uniform performance regardless of the terminal distance to the serving base station.

cdma2000 1/spl times/EV-DO forward link throughput sensitivity to diversity antenna correlation

This paper addresses the effects of the fade correlation between the receiver antennas of an access terminal (AT) on the forward link sector capacity of a cdma2000 1/spl times/EV-DO system. Traditionally, high fade correlation has been considered to be a significant source of capacity degradation for fixed rate wireless data/voice modems due to the lack of diversity and hence the increased variance of the received signal power which results in an increased fade margin or power control set point. The 1/spl times/EV-DO system, due to its advanced link adaptation, variable rate control, and multiuser diversity mechanisms, possesses inherent robustness towards such a lack of diversity. This point is demonstrated in this paper by network level simulations as well as by field data.