Asymptotically Optimal Channel Feedback Protocol Design for Cognitive Multiple Access Channels

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review

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Author(s)

Detail(s)

Original languageEnglish
Title of host publication2012 IEEE Global Communications Conference (GLOBECOM)
Pages2196-2202
Publication statusPublished - Dec 2012
Externally publishedYes

Publication series

NameGLOBECOM - IEEE Global Telecommunications Conference
ISSN (Print)1930-529X

Conference

Title2012 IEEE Global Communications Conference (GLOBECOM 2012)
PlaceUnited States
CityAnaheim
Period3 - 7 December 2012

Abstract

In cognitive multiple access networks, primary-secondary feedback links are needed to convey secondary transmitter primary base station (STPB) channel gains from the primary base station (PBS) to the secondary base station (SBS). To reduce the amount of feedback exchange between PBS and SBS, this paper proposes a feedback control protocol called K-smallest channel gains (K-SCG) feedback protocol in which the PBS feeds back the KN smallest STPB channel gains, out of N of them, to the SBS. We study the performance of K-SCG feedback protocol for total power and interference limited (TPIL) networks when transmit powers of secondary users (SUs) are optimally allocated. In TPIL networks, transmit powers of SUs are limited by an average total power constraint as well as a constraint on the average total interference power that they cause to the PBS. It is shown that for KN = Nδ with δ ∈ (0, 1), K-SCG feedback protocol is asymptotically optimal, i.e., secondary network throughput under K-SCG and full feedback protocols scales according to 1/nlog log (N) where nh is a parameter obtained from the distribution of secondary transmitter secondary base station (STSB) channel power gains, and N is the number of SUs. It is also shown that for KN = o(N), the interference power at the PBS converges to zero almost surely and in mean as N becomes large. This result implies that for N large enough, the secondary network just requires the indices of SUs corresponding to the KN smallest STPB channel gains for performing jointly optimal user scheduling and power allocation rather than the actual realizations of STPB channel gains.

Citation Format(s)

Asymptotically Optimal Channel Feedback Protocol Design for Cognitive Multiple Access Channels. / Nekouei, Ehsan; Inaltekin, Hazer; Dey, Subhrakanti.

2012 IEEE Global Communications Conference (GLOBECOM). 2012. p. 2196-2202 6503441 (GLOBECOM - IEEE Global Telecommunications Conference).

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review