Open AccessChannel estimation and symbol detection for OFDM systems using data‐nulling superimposed pilots
Author(s) -
Dou Gaoqi,
He Chunquan,
Li Congying,
Gao Jun
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2013.2832
Subject(s) - orthogonal frequency division multiplexing , channel (broadcasting) , precoding , computer science , distortion (music) , multiplexing , electronic engineering , algorithm , frequency division multiplexing , telecommunications , engineering , bandwidth (computing) , mimo , amplifier
A novel data‐nulling superimposed pilot scheme for orthogonal frequency division multiplexing (OFDM) systems is proposed, where the input data vector is spread over all the subcarriers by a precoding matrix and then nulled at certain subcarriers for the insertion of training pilots. This method avoids the loss of the data rate for frequency‐division multiplexed pilots, but results in the distortion of input data. To mitigate the distortion introduced by the nulling operation, a simple iterative reconstruction scheme is used to improve the detection performance.