Power-Bandwidth Tradeoff in Multiuser Relay Channels with Opportunistic Scheduling

Details Power-Bandwidth Tradeoff in Multiuser Relay Channels with Opportunistic Scheduling Power-Bandwidth Tradeoff in Multiuser Relay Channels with Opportunistic Scheduling

2008-10-28

arxiv.org/abs/0810.5090v1

Computer Science

Information Theory

7 pages, to appear in Proc. of 46th Annual Allerton Conference on Communication, Control and Computing, Monticello, IL, U.S.A.

Scientific paper

The goal of this paper is to understand the key merits of multihop relaying techniques jointly in terms of their energy efficiency and spectral efficiency advantages in the presence of multiuser diversity gains from opportunistic (i.e., channel-aware) scheduling and identify the regimes and conditions in which relay-assisted multiuser communication provides a clear advantage over direct multiuser communication. For this purpose, we use Shannon-theoretic tools to analyze the tradeoff between energy efficiency and spectral efficiency (known as the power-bandwidth tradeoff) over a fading multiuser relay channel with $K$ users in the asymptotic regime of large (but finite) number of users (i.e., dense network). Benefiting from the extreme-value theoretic results of \cite{Oyman_isit07}, we characterize the power-bandwidth tradeoff and the associated energy and spectral efficiency measures of the bandwidth-limited high signal-to-noise ratio (SNR) and power-limited low SNR regimes, and utilize them in investigating the large system behavior of the multiuser relay channel as a function of the number of users and physical channel SNRs. Our analysis results in very accurate closed-form formulas in the large (but finite) $K$ regime that quantify energy and spectral efficiency performance, and provides insights on the impact of multihop relaying and multiuser diversity techniques on the power-bandwidth tradeoff.

Affiliated with

Also associated with

No associations

Rating

Power-Bandwidth Tradeoff in Multiuser Relay Channels with Opportunistic Scheduling does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Power-Bandwidth Tradeoff in Multiuser Relay Channels with Opportunistic Scheduling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power-Bandwidth Tradeoff in Multiuser Relay Channels with Opportunistic Scheduling will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-486286