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1. (WO2017152855) EFFICIENT METHODS AND RECURSIVE/SCALABLE CIRCUIT ARCHITECTURES FOR QAM SYMBOL MEAN AND VARIANCE ESTIMATIONS

Pub. No.:    WO/2017/152855    International Application No.:    PCT/CN2017/076121
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Mar 10 00:59:59 CET 2017
IPC: H04L 27/01
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
Inventors: YUE, Guosen
QI, Xiao Feng
Title: EFFICIENT METHODS AND RECURSIVE/SCALABLE CIRCUIT ARCHITECTURES FOR QAM SYMBOL MEAN AND VARIANCE ESTIMATIONS
Abstract:
Circuits for producing signals representative of mean and variance estimations for quadrature amplitude modulation (QAM) are provided where the circuits comprise: sequentially repeated first circuit modules and sequentially repeated second circuit modules configured for producing updates in the corresponding estimation iterations. In one embodiment, a closest negative integer power of 2 is used as a substitute multiplicand when multiplying together two or more outputs of hyperbolic function generating units where the substituted for output is less than one. Size and complexity of the corresponding multiplier can then be reduced.