TY - GEN
T1 - Combining superposition coding and binning achieves capacity for the Gaussian cognitive interference channel
AU - Rini, Stefano
AU - Kurniawan, Ernest
AU - Goldsmith, Andrea
PY - 2012
Y1 - 2012
N2 - The cognitive interference channel models cognitive overlay radio systems, in which cognitive radios overhear the transmission of neighboring nodes. For the Gaussian case capacity is known in three subsets of the parameter space: the 'weak interference', 'very strong interference' and 'primary decodes cognitive' regime. Capacity in the 'very strong interference' regime is achieved by superposing the cognitive message over the primary message while in the 'primary decodes cognitive' regime the cognitive message is binned against the primary message. This paper provides a new capacity result obtained by combining the capacity achieving schemes in these two regimes thus generalizing and extending these results. Interestingly, the capacity achieving strategy for a given channel also depends on the level of cooperation among the users: that is, either superposition coding or binning is employed depending on the amount of power allotted by the cognitive transmitter to aid the primary user.
AB - The cognitive interference channel models cognitive overlay radio systems, in which cognitive radios overhear the transmission of neighboring nodes. For the Gaussian case capacity is known in three subsets of the parameter space: the 'weak interference', 'very strong interference' and 'primary decodes cognitive' regime. Capacity in the 'very strong interference' regime is achieved by superposing the cognitive message over the primary message while in the 'primary decodes cognitive' regime the cognitive message is binned against the primary message. This paper provides a new capacity result obtained by combining the capacity achieving schemes in these two regimes thus generalizing and extending these results. Interestingly, the capacity achieving strategy for a given channel also depends on the level of cooperation among the users: that is, either superposition coding or binning is employed depending on the amount of power allotted by the cognitive transmitter to aid the primary user.
KW - binning
KW - capacity
KW - cognitive interference channel
KW - superposition coding
UR - http://www.scopus.com/inward/record.url?scp=84873106980&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84873106980&partnerID=8YFLogxK
U2 - 10.1109/ITW.2012.6404664
DO - 10.1109/ITW.2012.6404664
M3 - Conference contribution
AN - SCOPUS:84873106980
SN - 9781467302234
T3 - 2012 IEEE Information Theory Workshop, ITW 2012
SP - 227
EP - 231
BT - 2012 IEEE Information Theory Workshop, ITW 2012
T2 - 2012 IEEE Information Theory Workshop, ITW 2012
Y2 - 3 September 2012 through 7 September 2012
ER -