Open AccessEfficient carrier frequency offset estimation for orthogonal frequency‐division multiple access uplink with an arbitrary number of subscriber stations
Author(s) -
Ho HsienKwei,
Kiang JeanFu
Publication year - 2014
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2013.0393
Subject(s) - orthogonal frequency division multiple access , telecommunications link , carrier frequency offset , computer science , multiplication (music) , orthogonal frequency division multiplexing , offset (computer science) , algorithm , division (mathematics) , computation , frequency offset , frequency division multiple access , overhead (engineering) , orthographic projection , telecommunications , mathematics , arithmetic , combinatorics , programming language , operating system , channel (broadcasting) , artificial intelligence
An efficient method is proposed to estimate the carrier frequency offsets (CFOs) in the orthogonal frequency‐division multiple access (OFDMA) uplink. The conventional alternating projection method is accelerated by utilising the inherited properties of the matrices involved. The multiplication of large sparse projection matrices can be elegantly transformed to a series of products involving small dense matrices, and the inverse operation of these large matrices can be substituted by direct computations. Hence, the computational cost is significantly reduced without compromising the accuracy of the CFO estimation.