Capacity analysis of wireless ad hoc networks with improved channel reservation
Capacity analysis of wireless ad hoc networks with improved channel reservation
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DOI：
10.1109/wcnc.2015.7127638
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
Yongping Zhang;Bo Li;Mao Yang;Zhongjiang Yan
中科院分区：
文献类型：
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作者：
Yongping Zhang;Bo Li;Mao Yang;Zhongjiang Yan
在自组织网络中，干扰是限制网络容量的重要因素。在每个接收器周围设置保留区已被广泛认为是为了减轻干扰。较大的预留区域可以减少干扰，但它也降低了减少同时传输的空间重用。因此，存在一个最优预留区域来最大化网络容量。本文引入速率自适应对信道预留方案进行改进，研究了扩频自组网通过联合优化数据速率和预留区域所获得的网络容量。分析和数值结果表明，与固定数据速率假设下的传输容量相比，直接序列扩频(DS)扩频网络的容量增益保持在300%量级不变，而跳频(FH)扩频网络的容量增益在300-800%的范围内随着扩频因子的增加而增加。
In ad hoc networks, interference is an important factor limiting the network capacity. Imposing a reservation zone around each receiver has been widely considered to mitigate the interference. A larger reservation zone can decrease the interference, but it also lowers the spatial reuse for reduced simultaneous transmissions. Therefore, there exists an optimal reservation zone to maximize the network capacity. In this paper, rate adaptation is brought to improve the channel reservation scheme, and network capacity achieved by jointly optimizing the data rate and reservation zone is investigated for spread-spectrum (SS) ad hoc networks. Compared to the transmission capacity with fixed data rate assumption, analytical and numerical results show that network capacity can be significantly improved, and the capacity gain remains constant in the order of 300% for direct sequence (DS) SS networks and increases with the growing spreading factors in the range of 300-800% for frequency hopping (FH) SS networks.