Math @ Duke

Publications [#319370] of Henry Pfister
Papers Published
 Wilson, MP; Narayanan, K; Pfister, HD; Sprintson, A, Joint physical layer coding and network coding for bidirectional relaying,
Ieee Transactions on Information Theory, vol. 56 no. 11
(November, 2010),
pp. 56415654, Institute of Electrical and Electronics Engineers (IEEE) [doi]
(last updated on 2019/07/17)
Abstract: We consider a communication system where two transmitters wish to exchange information through a central relay. The transmitter and relay nodes exchange data over synchronized, average power constrained additive white Gaussian noise channels with a real input with signaltonoise ratio (SNR) of ssr. An upper bound on the capacity is 1/2 log (1+ ssr) bits per transmitter per use of the multiple access phase and broadcast phase of the bidirectional relay channel. We show that, using lattice codes and lattice decoding, we can obtain a rate of 1/2 log (1/2 + ssr) bits per transmitter, which is essentially optimal at high SNR. The main idea is to decode the sum of the codewords modulo a lattice at the relay followed by a broadcast phase which performs SlepianWolf coding. We also show that if the two transmitters use identical lattices with minimum angle decoding, we can achieve the same rate of 1/2 log(1/2 + snr). The proposed scheme can be thought of as a joint physicallayer networklayer code which outperforms other recently proposed analog network coding schemes. © 2006 IEEE.


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