MIMO beamforming for QoS enhancement via analog, digital and hybrid relaying

Jongrok Park, Sanghoon Lee

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Quality-of-service (QoS) of multimedia broadcast/multicast service (MBMS) is the most challenging issue that needs to be addressed for next generation wireless broadcasting. Multiple-input/multiple-output (MIMO) and multihop relay technologies are viable options for improving QoS of MBMS. For stable MBMS, the average throughput of overall cell region must be guaranteed. Nevertheless, severe throughput degradation may occur in the outer region of multicells due to significant interference from neighboring cells or relay stations, thereby limiting the overall performance. This paper describes an effective technique, which combines MIMO and two-hop relay, to guarantee the QoS of edge users. We assume that the channel between the base station (BS) and the fixed relay station (FRS) is line-of-sight (LOS). First, we define a criterion needed to install the FRS. Second, we construct a weight matrix for hybrid relaying having lower complexity than digital relaying. Finally, we propose a user scheduling algorithm which can be adapted to analog relaying (amplify and forward), digital relaying (decode and forward) and hybrid relaying (filter, amplify and forward). The simulation results show that the proposed method can improve both the QoS of edge users and the sum-rate.

Original languageEnglish
Article number5535202
Pages (from-to)494-503
Number of pages10
JournalIEEE Transactions on Broadcasting
Issue number4
Publication statusPublished - 2010 Dec

Bibliographical note

Funding Information:
Manuscript received January 16, 2009; revised June 13, 2010; accepted June 19, 2010. Date of publication August 03, 2010; date of current version November 19, 2010 This work was supported by the IT R&D program of MKE/KEIT [KI002091, Research on Multiple Antenna and Multihop Relay Transmission Technologies for Next Generation Mobile Broadcasting Service].

All Science Journal Classification (ASJC) codes

  • Media Technology
  • Electrical and Electronic Engineering


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