Interference Analysis for FH-Based Multi-radio Wireless Mesh Networks

In this paper, we study the interference analysis in a Nocoherent Frequency-Hopping (NC-FH) MFSK rural infrastructure Wireless Mesh Networks (WMNs) with each router node being equipped with multiple radio interfaces. Our choice of the FH/MFSK modulation technique here is not just to satisfy the security requirement in military communications but also to provide easy implementation for each router nodes; since FH/MFSK modulation technique has been specified in IEEE 802.11 standard, these router nodes can be implemented also using IEEE 802.11(FH) equipments. The performances of noncoherent slow frequency-hopping system with

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-ary frequency-shift-keyed modulation (NC-FH/MFSK) with AWGN channel and Rician fading under independent multitone jamming (independent MTJ) are investigated in this paper. The expressions for calculating the exact BER performances of the system under the effect of the jamming strategies are derived. We apply the analyses to channel assignment (CA) in multiradio rural WMNs. We obtain a new interference model combining interfence tone and partial band noise, which would be incorporated into the CA algorithm to assign the most appropriate channel (or hopping pattern, in our case) to links in the mesh. Because it takes into account both the intra-network and the coexisting-network interferences, the new interference model thus reflects a very realistic interference situation in WMNs.