期刊
IEEE TRANSACTIONS ON INFORMATION THEORY
卷 57, 期 1, 页码 137-155出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIT.2010.2090215
关键词
Cooperation; cooperative relay broadcast channel; information theoretic security; secrecy
资金
- NSF [CCF 04-47613, CCF 05-14846, CNS 07-16311, CCF 07-29127]
We investigate the effects of user cooperation on the secrecy of broadcast channels by considering a cooperative relay broadcast channel. We show that user cooperation can increase the achievable secrecy region. We propose an achievable scheme that combines Marton's coding scheme for broadcast channels and Cover and El Gamal's compress-and-forward scheme for relay channels. We derive outer bounds for the rate-equivocation region using auxiliary random variables for single-letterization. Finally, we consider a Gaussian channel and show that both users can have positive secrecy rates, which is not possible for scalar Gaussian broadcast channels without cooperation.
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