Interference alignment with limited feedback


Jatin Thukral and Helmut Bölcskei


Proc. of IEEE International Symposium on Information Theory (ISIT), Seoul, South Korea, pp. 1759-1763, June 2009.

DOI: 10.1109/ISIT.2009.5205266

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We consider single-antenna interference networks where M sources, each with an average transmit power of P/M, communicate with M destinations over frequency-selective channels (with L taps each) and each destination has perfect knowledge of its channels from each of the sources. Assuming that there exist error-free non-interfering broadcast feedback links from each destination to all the nodes (i.e., sources and destinations) in the network, we show that naive interference alignment, in conjunction with vector quantization of the impulse response coefficients according to the scheme proposed in Mukkavilli et al., IEEE Trans. IT, 2003, achieves full spatial multiplexing gain of M/2, provided that the number of feedback bits broadcast by each destination is at least M(L-1)log(P).


Interference alignment, limited feedback, vector quantization

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