Impact of Shadowing Correlation on Interference- Aware Channel Segregation Based DCA
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چکیده
In wireless networks, the same channel must be reused at different access points (APs). The co-channel interference (CCI) is a predominant factor that limits the transmission quality. Recently, we proposed an interferenceaware channel segregation based dynamic channel assignment (IACS-DCA) which forms a channel reuse pattern with low CCI in a distributed manner. In our proposed IACS-DCA, each AP periodically monitors the beacon signals transmitted from other APs and measures the average CCI powers on all available channels to select the best channel to use. However, the actual uplink propagation loss of the co-channel mobile station (STA)to-AP link is different from that of the co-channel AP-to-AP link due to shadowing. The same is true for the actual downlink shadowing propagation loss. In this paper, we study the impact of shadowing correlation ρ between co-channel AP-to-AP link and actual CCI link on IACS-DCA by computer simulation. It is shown that as ρ decreases, the CCI power experienced at each AP increases, but the 10%-outage signal-to-interference power ratio (SIR) degrades by only 1dB even when ρ=0.4. Keywords—channel segregation; dynamic channel assignment; co-channel interference; shadowing correlation
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تاریخ انتشار 2014