NDLI: Multi-relay cooperative transmission based on rateless codes and adaptive demodulation

Content Provider	IET Digital Library
Author	Lei, Weijia Song, Haina
Abstract	A rate adaption scheme is given at the receiver using rateless codes and log-likelihood ratio (LLR) threshold-based adaptive demodulation (ADM). The received bits with LLR absolute values higher than the preset threshold are demodulated by the receiver, otherwise, deleted. Through the theoretical analysis of the average mutual information (MI) of the demodulated bits, the method is obtained to calculate the LLR demodulation threshold under the required error performance after decoding and the constraint of codeword length for decoding. Then, the rate adaption scheme is applied in a parallel multiple relay wireless communication system. The LLR threshold is set according to the instantaneous SNR of the received signals in order to keep the average MI per demodulated bit of each relay link the same. The demodulated bits coming from all links are combined for decoding. The 256-QAM constellation and Raptor code are then considered as a special case to design a sample scheme. Simulation results prove the correctness of the theoretical analysis and the feasibility of the proposed scheme, and when it is employed by a multi-relay transmission system, the diversity gain can be obtained, and the anti-fading and the anti-jamming abilities of the system are promoted.
Starting Page	586
Ending Page	594
Page Count	9
ISSN	17518628
Volume Number	12
e-ISSN	17518636
Issue Number	Issue 5, Mar (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/12/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2017.1181
Journal	IET Communications
Publisher Date	2017-12-31
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Code Cooperative Communication Decoding Demodulation Flat Rayleigh Fading LLR Threshold-based Adaptive Demodulation Log-likelihood Ratio Threshold-based Adaptive Demodulation Multiple Relay Path Cooperative Communication System QAM Constellation Quadrature Amplitude Modulation Radio Link And Equipment Raptor Code Rateless Code Rayleigh Channel Relay Network Telecommunication
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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