论文部分内容阅读
This paper presents a low complexity optimized algorithm for design of bilayer lengthened LDPC(BL-LDPC) code for decode-and-forward relay system.The design is performed over the expanded graph of the BL-LDPC code,which consists of the original bilayer graph and the extra added relaygenerated parity check bits.To build up our proposed optimized algorithm,we present a modified Gaussian approximation algorithm for the expanded structure of the BL-LDPC code.Then using the proposed optimized algorithm,we find the optimum overall expanded graph of the BL-LDPC code.Simulation results show that the BL-LDPC codes obtained by our proposed optimized algorithm have excellent bit-error-rate performances and small gaps between the convergence thresholds and the theoretical limits when transmitted over the additive white Gaussian noise channels.
This paper presents a low complexity optimized algorithm for design of bilayer lengthened LDPC (BL-LDPC) code for decode-and-forward relay system. The design is performed over the expanded graph of the BL-LDPC code, which consists of the original bilayer graph and the extra added relaygenerated parity check bits. To build up our proposed optimized algorithm, we present a modified Gaussian approximation algorithm for the expanded structure of the BL-LDPC code. Using the proposed optimized algorithm of the BL-LDPC code. Simulation results show that the BL-LDPC codes obtained by our proposed optimized algorithm have excellent bit-error-rate performances and small gaps between the convergence thresholds and the theoretical limits when transmitted over the additive white Gaussian noise channels .