Asymptotic Analysis of Transmission Capacities for Overlaid Spread-Spectrum Wireless Networks  

作　　者：Huarui Wu Di Li Changchuan Yin 

机构地区：[1]Department of Computer Application, National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China [2]Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China

出　　处：《China Communications》2010年第3期81-90,共10页中国通信（英文版）

基　　金：supported in part by the China 863 Program grants 2007AA10Z235, 2007AA01Z179, 2006BAJ09B05, 2008BADA0B05;the NSFC grants 60972073, 60871042, 60872049, and 60971082;the China National Great Science Specifi c Project grant 2009ZX03003-011;the China 973 Program grant 2009CB320407

摘　　要：We study the transmission capacities of two coexisting spread-spectrum wireless networks (a primary network vs. a secondary network) that operate in the same geographic region and share the same spectrum. We defi ne transmission capacity as the product among the density of transmissions, the transmission rate, and the successful transmission probability. The primary (PR) network has a higher priority to access the spectrum without particular considerations for the secondary (SR) network, while the SR network limits its interference to the PR network by carefully controlling the density ofits transmitters. Considering two types of spread-spectrum transmission schemes (FH-CDMA and DS-CDMA) and the channel inversion power control mechanism, we quantify the transmission capacities for these two networks based on asymptotic analysis. Our results show that if the PR network permits a small increase ofits outage probability, the sum transmission capacities of the two networks (i.e., the overall spectrumefficiency per unit area) will be boosted significantly over that of a single network.We study the transmission capacities of two coexisting spread-spectrum wireless networks （a primary network vs. a secondary network） that operate in the same geographic region and share the same spectrum. We define transmission capacity as the product among the density of transmissions, the transmission rate, and the successful transmission probability. The primary （PR） network has a higher priority to access the spectrum without particular considerations for the secondary （SR） network, while the SR network limits its in- terference to the PR network by carefully control- ling the density of its transmitters. Considering two types of spread-spectrum transmission schemes （FH-CDMA and DS-CDMA） and the channel inversion power control mechanism, we quantify the transmission capacities for these two networks based on asymptotic analysis. Our results show that if the PR network permits a small increase of its outage probability, the sum transmission capacities of the two networks （i.e., the overall spectrum efficiency per unit area） will be boosted signifi- cantly over that of a single network.

关 键 词：transmission capacity ad hoc network spread spectrum stochastic geometry 

分 类 号：TN915[电子电信—通信与信息系统] TN92[电子电信—信息与通信工程]