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In this paper, the authors extend a well-developed quantization scheme to block fading relay system using compress-and-forward and propose a new Achievable Rate Based Quantization Scheme (ARBQS). A new signal combination scheme with less complexity is also proposed accordingly. Based on the scalar quantizer obtained, vector quantizer with Trellis Coded Quantization (TCQ) scheme is provided. While many quantization schemes have concentrated on minimization of quantization distortion, their simulations results indicate that the new scheme achieves better performance in both AWGN case and block fading case without distortion minimization and achieve higher compression efficiency and reduced complexity simultaneously.
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