Achievable Energy per bit for the Multi-pair MIMO Bidirectional Broadcast Channel

Conference: European Wireless 2012 - 18th European Wireless Conference 2012
04/18/2012 - 04/20/2012 at Poznan, Poland

Proceedings: European Wireless 2012

Pages: 6Language: englishTyp: PDF

Do, Tan Tai; Oechtering, Tobias J.; Skoglund, Mikael (Royal Institute of Technology (KTH), ACCESS Linnaeus Center, SE-100 44 Stockholm, Sweden)

This paper presents a transmit strategy for the AWGN multi-pair MIMO bidirectional broadcast channels in the wideband regime. An achievable wideband rate region and an achievable energy per bit region are provided. The transmit covariance matrix at the relay has been designed in order to maximize the wideband weighted rate sum. A closed form of the optimal matrix is derived, which shows that a single beam transmit strategy is optimal. In addition, an energy efficiency versus fairness analysis is considered. Lastly, some discussions on the minimum energy per bit are given.