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1. (WO2017149774) COMMUNICATION SYSTEM, RELAY DEVICE, RECEPTION DEVICE, RELAY METHOD, RECEPTION METHOD, RELAY PROGRAM, AND RECEPTION PROGRAM

Pub. No.:    WO/2017/149774    International Application No.:    PCT/JP2016/056846
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Sat Mar 05 00:59:59 CET 2016
IPC: H04B 7/15
H04B 7/08
Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
日本電信電話株式会社
Inventors: MIYAMOTO Kenji
宮本 健司
KUWANO Shigeru
桑野 茂
TERADA Jun
寺田 純
Title: COMMUNICATION SYSTEM, RELAY DEVICE, RECEPTION DEVICE, RELAY METHOD, RECEPTION METHOD, RELAY PROGRAM, AND RECEPTION PROGRAM
Abstract:
A relay device that has: an estimation unit that, on the basis of a reception SNR value, selects a codebook number that corresponds to a reception SNR range; a soft demodulation unit that, by performing soft demodulation on a received first signal, detects a likelihood for the received first signal; a first storage unit that stores a first quantization codebook that indicates, by codebook number, the relationship between quantization parameters and likelihood quantized bit values; a quantization unit that references the first quantization codebook to obtain the relationship between a quantization parameter and a likelihood quantized bit value that correspond to the selected codebook number and uses the obtained relationship to adaptively quantize the detected likelihood and thereby obtain a likelihood quantized bit value; and a transmission unit that transmits, to a reception device, a second signal that includes the obtained likelihood quantized bit value and the selected codebook number.