Practical Considerations for Channel Assignment in Wireless Mesh Networks
In multi-radio Wireless Mesh Networks (WMNs) several radios can operate within one node simultaneously on different channels. Due to frequency selective fading and varying output powers of WLAN cards the received signal strength on channels in the U-NII band can differ by several dB. Furthermore, power leakage from neighboring channels in the frequency spectrum can cause Adjacent Channel Interference (ACI). Using an IEEE 802.11a testbed, the authors experimentally evaluate the achievable throughput of a multi-radio mesh network in a string topology under the impact of ACI and channel heterogeneity. Their results show that for low PHY rates the channel separation is a good indicator for throughput.