In this thesis, we propose a new information relaying approach for cooperative communication with low source-to-destination channel SNR. The relay first performs scalar quantization on received source signal, and then jointly apply the parity approach of distributed source coding and multi-level coding prior to the transmission to destination with channel code. The destination estimates the received relay signal by a joint decoding of the signals from both the source node and relay node, followed by decoding of the source message using both the received source signal and reconstruction relay signal. Also proposed is a signal estimation scheme based on the turbo-like iterative source-channel decoding. Simulation results indicate that proposed relaying system yields better performances when source-to-destination channel SNR is low.