期刊名称：International Journal of Computer Science and Information Technologies
电子版ISSN：0975-9646
出版年度：2014
卷号：5
期号：2
页码：1754-1758
出版社：TechScience Publications
摘要：Wireless communication sees an explosive growth in the number of customers in the past few decades, making large- scale wireless ad hoc network an important part of modern life. In such a large-scale wireless network, information are transmitted in a multi-hop fashion. However, due to the unreliability of links in severe environment, such a multi-hop path may not exist all the time, making delay a significant issue. Besides broadcasting is probably the most fundamental operation among all operations of wireless ad hoc networks. The broadcasting experiences problems like severe contention, collision, and congestion. Conventional wireless broadcast protocols rely heavily on the 802.11-based CSMA/CA model, which avoids interference and collision by conservative scheduling of transmissions. While CSMA/CA is amenable to multiple concurrent unicasts, it tends to degrade broadcast performance significantly. Moreover, the hidden terminal problem is known to degrade the throughput of wireless networks due to collisions. As a result, extensive research has been conducted to solve this problem such as Multiple Access Collision Avoidance (MACA). However, MACA-like protocols cannot solve this problem completely. In this paper, we propose a new protocol that improves the efficiency and scalability of broadcast service with a MAC/PHY layer that allows packet collisions. It resolves collision using symbol-level interference cancellation, and then combines the resolved symbols to restore the packet. Such a collision-tolerant mechanism significantly improves the transmission diversity and spatial reuse in wireless broadcast. It also helps in resolving collision caused due to hidden terminals.
关键词：Optimal broadcast; wireless ad hoc and mesh;networks; collision resolution; multipacket reception; selfinterference;cancellation; hidden terminal problem
