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1. (WO2017036301) METHOD AND APPARATUS FOR LOW COMPLEXITY ISI ESTIMATION USING SPARSE DISCONTINUOUS TIME-DOMAIN PILOTS

Pub. No.:    WO/2017/036301    International Application No.:    PCT/CN2016/095529
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Wed Aug 17 01:59:59 CEST 2016
IPC: H04L 25/03
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
Inventors: MITRA, Jeebak
ZHANG, Zhuhong
Title: METHOD AND APPARATUS FOR LOW COMPLEXITY ISI ESTIMATION USING SPARSE DISCONTINUOUS TIME-DOMAIN PILOTS
Abstract:
It is possible to perform ISI estimation for quasi-static band-limited communication channels using a minimal number of discontinuous pilots communicated across different time intervals. In one example, at least two frames are received in different time intervals, and noise vectors are extracted from pilots carried in the respective frames. Spectral estimation is performed on the noise vectors, collectively, to obtain a set of tap coefficients, which are then used to perform ISI equalization on at least one of the frames. In this way, ISI equalization is performed on a frame communicated in one time interval using at least some pilots communicated in another time interval. Using discontinuous pilots to perform channel estimation may enable lower pilot densities in next-generation communication systems.