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The authors presented some of their experiences and investigations with an experimental metropolitan multi-radio mesh network. In particular, they investigated how interference between metropolitan 802.11a links operating on adjacent channels affects throughput. For rate control, their 8 results show that the adaptation of the transmission rate on very small time-scales (on a per packet basis as is commonly the case with widely used auto-rate algorithms) not only does not improve performance, but can also result in significantly lower performance compared to an appropriately selected fixed transmission rate scheme. For channel assignment, they showed results demonstrating the importance of taking into account both internal and external interference.
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