摘要
A cross-layer design which combines adaptive modulation and coding (AMC) at the physical layer with a hybrid automatic repeat request (HARQ) protocol at the data link layer (LL) is presented, in cooperative relay system over Nakagami-m fading channels with perfect and imperfect channel state information (CSI). In order to maximize spectral efficiency (SE) under delay and packet error rate (PER) performance constraints, a state transition model and an optimization framework with perfect CSI are presented. Then the framework is extended to cooperative relay system with imperfect CSI. The numerical results show that the scheme can achieve maximum SE while satisfying transmitting delay requirements. Compared with the imperfect CSI, the average PER with perfect CSI is much lower and the spectral efficiency is much higher.
A cross-layer design which combines adaptive modulation and coding （AMC） at the physical layer with a hybrid automatic repeat request （HARQ） protocol at the data link layer （LL） is presented, in cooperative relay system over Nakagami-m fading channels with perfect and imperfect channel state information （CSI）. In order to maximize spectral efficiency （SE） under delay and packet error rate （PER） performance constraints, a state transition model and an optimization framework with perfect CSI are presented. Then the framework is extended to cooperative relay system with imperfect CSI. The numerical results show that the scheme can achieve maximum SE while satisfying transmitting delay requirements. Compared with the imperfect CSI, the average PER with perfect CSI is much lower and the spectral efficiency is much higher.
基金
Sponsored by the National Science and Technology Major Special Project of China (Grant No.2011ZX03003-003-02)
the Natural Science Foundation of China (Grant No. 60972070)
the Natural Science Foundation of Chongqing (Grant No. CSTC2009BA2090)
the Foundation of Chongqing Educational Committee ( Grant No. KJ100514)
the Special Fund of Chongqing Key Laboratory
