Stochastic amplify-and-forward schemes for multigroup multicast transmission in a distributed relay network
Refereed conference paper presented and published in conference proceedings


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AbstractIn this paper, we study amplify-and-forward (AF) schemes to for multigroup multicast information delivery between long-distance users. The target scenario is a two-hop distributed one-way relay network where the transmitters, relays and receivers are all equipped with a single antenna. Assuming that channel state information (CSI) is perfectly known, our goal here is to design the AF weights at the relays so that the system rate performance can be optimized. A classic AF scheme in this context is to employ a rank-one beamformed AF (BF-AF) strategy with a max-min-fair (MMF) achievable rate objective. In this way, the semidefinite relaxation (SDR) technique is widely used to provide an (approximate) solution for the MMF problem. It is known that the achievable rate performance of the SDR-based BF-AF scheme tends to degrade seriously with the number of users served in the relay network. This motivates us to propose stochastic beamformed AF (SBF-AF) schemes to improve the achievable rate performance. The salient feature of the SBF-AF schemes is that it employs time-varying AF weights and bypass some inherent issues in the SDR-based BF-AF scheme. Our theoretical analysis and numerical results both show that the SBF-AF schemes can outperform the BF-AF scheme.
All Author(s) ListWu S.X., Li Q., Ma W.-K., So A.M.-C.
Name of Conference16th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2015
Start Date of Conference28/06/2015
End Date of Conference01/07/2015
Place of ConferenceStockholm
Country/Region of ConferenceSweden
Detailed descriptionorganized by IEEE,
Year2015
Month8
Day27
Volume Number2015-August
Pages545 - 549
ISBN9781479919307
LanguagesEnglish-United Kingdom
Keywordsamplify-and-forward (AF), multigroup multicast, one-way relay, SDR, stochastic beamforming

Last updated on 2020-28-10 at 01:06