Simple Asynchronous Multiple Access (SAMA) for ad hoc wireless networks in unlicensed bands

被引:0
|
作者
Vukovic, IN [1 ]
Odlyzko, P [1 ]
机构
[1] Motorola Inc, Arlington Hts, IL 60004 USA
来源
2001 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-10, CONFERENCE RECORD | 2001年
关键词
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Effective spectrum sharing between non-interoperable radio devices as well as collocated but non-communicating radio networks is an important goal for the designers of RF systems intended to operate in license-free spectrum. Apart from the traditional approach of selecting separate channels for distinct systems, there are such methods as spread spectrum, scheduling of transmissions in non-overlapping intervals to reduce collisions and also spatial diversity to reduce the effects of interference. The last two are the most promising methods to use to achieve multi-megabit data rates and high traffic densities. The listen-before-transmit (LBT) etiquette has been used with limited success in the past in decentralized RF environments to enable non-interoperable systems to share spectrum. In this paper we introduce the Simple Asynchronous Multiple Access (SAMA) scheme that combines some of the known channel access techniques in a novel way to achieve implicit reservation effect that allows high throughput with modest overhead and low complexity without demanding interoperability or even explicit communications between the collocated systems. We analyze throughput and spatial performance of SAMA. he analysis is based on the radio propagation law and the geometry of users and antennas in the plane. It is aimed at establishing the fundamental performance bounds dictated by our basic assumptions. We cover the omni-directional antenna case and give preliminary results for the directional antenna case.
引用
收藏
页码:1269 / 1274
页数:6
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