Abstract
This paper investigates rate adaptation schemes for decoding-and-forward (DF) relay system based on random projections codes (RPC). We consider a classic three node relay system model, where relay node performs on half-duplex mode. Then, we give out receiving diversity relay scheme and coding diversity relay scheme, and present their jointly decoding methods. Furthermore, we discuss the performance of the two schemes with different power allocation coefficients. Simulations show that our relay schemes can achieve different gain with the help of relay node. And, we should allocate power to source node to just guarantee relay node can decode successfully, and allocate remain power to relay node as far as possible. In this way, this DF relay system not only achieves diversity gain, but also achieves higher and smooth spectrum efficiency.
Highlights
Rate adaptation is an important issue in wireless communication system
This paper investigates the rate adaptation schemes based on random projections codes for decoding-and-forward (DF) relay system
Assuming that the relay node R performs in half duplex mode, the relay channel is divided into broadcast mode (BC) and forward mode (FM)
Summary
Rate adaptation is an important issue in wireless communication system. Traditional rate adaptation techniques implemented at transmitter, such as hybrid automatic repeat request (HARQ) and adaptive modulation and coding (AMC), have two defects. Random projection codes (RPC) [3] [4] is a promising technique to implement rate adaption at receiver in modern wireless communication system. This paper investigates the rate adaptation schemes based on random projections codes for decoding-and-forward (DF) relay system. Source node uses random projections matrix (RPM) to encode, and broadcasts progressively modulation symbols to relay node and destination node. Destination node will feedback ACK to source node and relay node, and prepare for transmission of data frame We should allocate power to source node to just guarantee relay node decoding successfully, and allocate remain power to relay node as far as possible In this way, this DF relay system achieves diversity gain, and achieves higher and smooth spectrum efficiency.
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