Lattice Codes for Many-to-One Interference Channels With and Without Cognitive Messages
Jingge Zhu, Michael Gastpar
IEEE TRANSACTIONS ON INFORMATION THEORY | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Published : 2015
A new achievable rate region is given for the Gaussian cognitive many-to-one interference channel. The proposed novel coding scheme is based on the compute-and-forward approach with lattice codes. Using the idea of decoding sums of codewords, our scheme improves considerably upon the conventional coding schemes which treat interference as noise or decode messages simultaneously. Our strategy also extends directly to the usual many-to-one interference channels without cognitive messages. Comparing to the usual compute-and-forward scheme where a fixed lattice is used for the code construction, the novel scheme employs scaled lattices and also encompasses key ingredients of the existing schemes..View full abstract
Awarded by European ERC Starting
Manuscript received March 24, 2014; revised November 28, 2014; accepted January 4, 2015. Date of publication January 21, 2015; date of current version February 12, 2015. This work was supported by the European ERC Starting under Grant 259530-ComCom. This paper was presented at the 2013 IEEE International Symposium on Information Theory.