Asymptotically optimal sum-rate of random unitary beamforming with double thresholds

Hyung Ki Sung, Jinhee Lee, Young-Chai Ko

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The capacity of Multiple-Input Multiple-Output Broadcast Channel (MIMO-BC) is known to be achieved by Dirty Paper Coding (DPC). In multi-user environment, the sum-rate of DPC scales like M log log K for a large number of K users and fixed M antennas at the base station. Unfortunately, due to the limited feedback channel, the random unitary beamforming (RUB) has been presented as a simple and practical technique capable of supporting spatial division multiple access (SDMA) instead of DPC. Moreover, the multi-beam transmission with selective binary feedback (MBTSB) has been proposed to schedule the users simply as well as to reduce the amount of feedback per user by exploiting threshold. In this paper, we propose the RUB scheme with two different predetermined thresholds to extend the MBTSB. We first show that our proposed scheme can outperform the MBTSB without changing the amount of feedback per user. From our analysis, we show that the scaling law of our proposed scheme approaches to M log log K asymptotically for a large number of K users and the fixed M antennas.

Original languageEnglish
Title of host publicationProceedings of 4th IEEE Internatilonal Symposium on Wireless Communication Systems 2007, ISWCS
Pages538-542
Number of pages5
DOIs
Publication statusPublished - 2007 Dec 1
Event4th IEEE International Symposium on Wireless Communication Systems 2007, ISWCS'07 - Trondheim, Norway
Duration: 2007 Oct 162007 Oct 19

Other

Other4th IEEE International Symposium on Wireless Communication Systems 2007, ISWCS'07
CountryNorway
CityTrondheim
Period07/10/1607/10/19

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ASJC Scopus subject areas

  • Computer Networks and Communications
  • Communication

Cite this

Sung, H. K., Lee, J., & Ko, Y-C. (2007). Asymptotically optimal sum-rate of random unitary beamforming with double thresholds. In Proceedings of 4th IEEE Internatilonal Symposium on Wireless Communication Systems 2007, ISWCS (pp. 538-542). [4392398] https://doi.org/10.1109/ISWCS.2007.4392398