Sum-rate capacity of random beamforming for multi-antenna broadcast channels with other cell interference

Sung Hyun Moon, Sang Rim Lee, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


In this letter, we analyze the sum rate of random beamforming (RBF) for downlink multi-antenna systems in the presence of other cell interference (OCI). Employing extreme value theory, an expression of the asymptotic ergodic sum rate with a large number of users is derived from the limiting distribution of the sample maximum of the received signal-to-interference-plus-noise ratio. Based on our result, the scaling law of multiuser diversity gain is also exhibited in the context of RBF systems with the OCI, which is shown to coincide with the previous result without the other cell interferers. Simulation results verify the validity of our analysis even with not so large number of users.

Original languageEnglish
Article number5958562
Pages (from-to)2440-2444
Number of pages5
JournalIEEE Transactions on Wireless Communications
Issue number8
Publication statusPublished - 2011 Aug

Bibliographical note

Funding Information:
Manuscript received November 30, 2010; revised February 10, 2011; accepted June 3, 2011. The associate editor coordinating the review of this letter and approving it for publication was H. Jafarkhani. The authors are with the School of Electrical Engineering, Korea University, Seoul, Korea, 1, 5-Ga, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Korea (e-mail: {shmoon, sangrim78, inkyu} This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MEST) (No. 2010-0017909), and in part by Seoul R&BD Program(WR080951). This paper was presented in part at the IEEE International Conference on Communications (ICC) in Budapest, Hungary, May 2011. Digital Object Identifier 10.1109/TWC.2011.070711.102145


  • MIMO broadcast channel
  • multiuser scheduling
  • other-cell interference
  • random beamforming

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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