Capacity enhancement of secondary links through spatial diversity in spectrum sharing

Hano Wang, Jemin Lee, Sungtae Kim, Daesik Hong

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)


Previous investigations on capacity of secondary users in spectrum-sharing environments have determined the capacity of a secondary link based on the interference power threshold set at the primary receiver. In contrast to these previous works, we show that the capacity of a secondary link is determined based on a geographical relationship expressed as the ratio of the distance between the primary receiver and secondary transmitter to the distance between the secondary transmitter and receiver. Proceeding from that and in an effort, to enhance the capacity of the secondary user, which is limited by this distance-ratio, we adopt a secondary transmitter with antennas. Furthermore, we analyze the capacity achieved using a simple antenna selection process.

Original languageEnglish
Article number5403524
Pages (from-to)494-499
Number of pages6
JournalIEEE Transactions on Wireless Communications
Issue number2
Publication statusPublished - 2010 Feb

Bibliographical note

Funding Information:
This work was supported by the Korea Science and Engineering Foundation through the NRL Program (Grant R0A-2007-000-20043-0).

Funding Information:
This research was supported by the MKE (Ministry of Knowledge Economy), Korea, under the ITRC(Information Technology Research Center) support program supervised by the NIPA (National IT Industry Promotion Agency)(NIPA-2009-(C1090-0902-0005)). Digital Object Identifier 10.1109/TWC.2010.02.081339

All Science Journal Classification (ASJC) codes

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


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