A Low Complexity MAP Detector for OTFS Modulation in Logarithmic Domain

09/21/2021
by   Haoyan Liu, et al.
0

Orthogonal time-frequency space (OTFS) has been confirmed to take advantage of full time-frequency diversity to significantly improve error performance in high-mobility scenarios. We found that the proposed message passing (MP) and variational Bayes (VB) detectors can achieve approximate maximum a posteriori (MAP) detection, the interferences cannot be completely eliminated in the absence of noise. To achieve near-optimal MAP detection, this letter proposes a novel detection method based on sum-product algorithm (SPA) with low complexity. Leveraging subtly factorized posteriori probabilities, the obtained pairwise interactions can effectively avoid enumeration of high-dimensional variables, thereby making it applicable to fractional Doppler cases. We further simplify the proposed algorithm in the logarithmic domain so that the message propagation processing only involves addition. Finally, simulations results demonstrate the superior error performance gains of our proposed algorithm at high signal-to-noise ratios (SNRs).

READ FULL TEXT

page 1

page 2

page 3

page 4

research
11/28/2019

A Simple Variational Bayes Detector for Orthogonal Time Frequency Space (OTFS) Modulation

The emerging orthogonal time frequency space (OTFS) modulation technique...
research
08/15/2020

Iterative Detection for Orthogonal Time Frequency Space Modulation Using Approximate Message Passing with Unitary Transformation

The orthogonal time frequency space (OTFS) modulation has emerged as a p...
research
04/13/2021

Orthogonal Time Sequency Multiplexing Modulation: Analysis and Low-Complexity Receiver Design

This paper proposes orthogonal time sequency multiplexing (OTSM), a nove...
research
02/20/2020

Convolutional Approximate Message-Passing

This letter proposes a novel message-passing algorithm for signal recove...
research
07/06/2023

Performance Analysis and Approximate Message Passing Detection of Orthogonal Time Sequency Multiplexing Modulation

In orthogonal time sequency multiplexing (OTSM) modulation, the informat...
research
01/11/2021

Cross Domain Iterative Detection for Orthogonal Time Frequency Space Modulation

Recently proposed orthogonal time frequency space (OTFS) modulation has ...
research
08/28/2019

A steganographic approach based on the chaotic fractional map and in the DCT domain

A steganographic method based on the chaotic fractional map and in the D...

Please sign up or login with your details

Forgot password? Click here to reset