Optimal channel estimation using DFT-based interpolation with comb-type pilots for OFDM systems

TitleOptimal channel estimation using DFT-based interpolation with comb-type pilots for OFDM systems
Publication TypeBook
Year of Publication2018
AuthorsBiyyam, S.., and A.. Bhuma
Series TitleLecture Notes in Networks and Systems
Volume7
Number of Pages473 - 484
PublisherSpringer
ISBN Number23673370 (ISSN)
KeywordsChannel estimation, Error analysis, Interpolation, OFDM
Abstract

Orthogonal frequency division multiplexing (OFDM) is the multicarrier modulation scheme of choice in most of modern digital communication systems. For coherent detection of OFDM signals that maximize the system bit error rate (BER) performance, we need the knowledge of channel frequency response (CFR) coefficients at the receiver. Therefore, channel estimation becomes a critical task. In this paper, we present a novel DFT-based optimal channel estimation procedure that has very low computational complexity. The assumption made in this work is that the number of pilot symbols transmitted is at least equal to the number of channel impulse response coefficients. This assumption is quite reasonable in practice. The estimation is optimal, in the sense that the interpolation of the CFR from pilot subcarriers to all subcarriers is exact, in the absence of noise at pilot subcarriers. Simulation results demonstrate the advantage of our approach over the other prevalent methods. © 2018, Springer Nature Singapore Pte Ltd.

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85063135035&doi=10.1007%2f978-981-10-3812-9_50&partnerID=40&md5=3a36efd99fccaa3a8b3988603f828013
Short TitleLect. Notes Networks Syst.