Li Erran Li, Kun Tan, Harish Viswanathan, Ying Xu, and Yang Richard Yang
24 September 2010
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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