Diversity-multiplexing tradeoff in two-user fading interference channels


Cemal Akçaba and Helmut Bölcskei


IEEE Transactions on Information Theory, Vol. 58, No. 7, pp. 4462-4480, July 2012

DOI: 10.1109/TIT.2012.2191473

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We analyze the two-user single-antenna fading interference channel with perfect receive channel state information (CSI) and no transmit CSI. The diversity-multiplexing tradeoff (DMT) region of a fixed-power-split Han and Kobayashi (HK)-type superposition coding scheme is considered and design criteria for the corresponding superposition codes are derived. We demonstrate that this scheme is DMT-optimal under strong and very strong interference by showing that it achieves a DMT region outer bound that we derive. In addition, we show that, under very strong interference, decoding interference while treating the intended signal as noise, subtracting the result out, and then decoding the desired signal, a process known as “stripping”, achieves the optimal DMT region. Our proofs reveal code design criteria for achieving DMT optimality (in the cases where we can demonstrate it).


Diversity-multiplexing tradeoff (DMT), Han and Kobayashi (HK) superposition coding scheme, interference channel (IC)

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