Retransmission =/= Repeat: Simple Retransmission Permutation Can Resolve Overlapping Channel Collisions

Collisions in overlapping channels can be a major problem in the

deployment of high-speed OFDMnetworks. In this paper, we present

Remap, a simple, novel paradigm for handling collisions in overlapping

OFDM channels. Remap introduces a novel concept of

retransmission permutation that permutes the bit-to-subcarrier assignment

after each transmission, departing from the traditional,

simply-repeat paradigm. Remap is simple to implement and able

to exploit collision-free subcarriers to decode frames despite successive

collisions in overlapping channels. We apply Remap to

802.11g to demonstrate that the diversity created by remapped frames

can substantially improve decoding efficiency and improve wireless

throughput. We implement our technique in software radio

and demonstrate that it has potential to be deployed with simple

software and firmware updates.

In  ACM Mobicom 2010

Publisher  Association for Computing Machinery, Inc.
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