Volume no :46, Issue no: 1, July (2017)

Journal of Mathematical Sciences: Advances and Applications

A JOINT ALGORITHM OF EQUALIZER AND DETECTOR BASED ON CODED-OFDM SYSTEMS IN HIGH-SPEED CHANNELS

Author's: Lei Lin
Pages: [83] - [96]
Received Date: July 8, 2017
Submitted by:
DOI: http://dx.doi.org/10.18642/jmsaa_7100121856

Abstract

In this letter, we present a joint algorithm of equalization and detector based on block Markov superposition transmission (BMST) codes for OFDM systems (called BMST-OFDM) over high-speed channels. In the BMST-OFDM systems, the equalizer can exchange soft messages with the demapper and BMST decoder in an iterative fashion. Simulation results show that: (1) our proposed equalization algorithm can perform better than the conventional algorithms in the BMST-OFDM systems, although the proposed equalizer has a higher error floor in the un-coded systems, (2) our proposed equalization algorithm has lower computation complexity than the conventional algorithms, which require to construct a huge state space or perform the inversion of matrix, and (3) the performances of the proposed scheme match well with the lower bounds in the high signal-to-noise ratio (SNR) region.

Keywords

high-speed channel, orthogonal frequency division multiplexing (OFDM), equalizer, detector.