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

Li Erran Li, Kun Tan, Harish Viswanathan, Ying Xu, and Yang Richard Yang

Abstract

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.

Details

Publication typeInproceedings
Published inACM Mobicom 2010
PublisherAssociation for Computing Machinery, Inc.
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