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

by   Zeping Sui, et al.

In orthogonal time sequency multiplexing (OTSM) modulation, the information symbols are conveyed in the delay-sequency domain upon exploiting the inverse Walsh Hadamard transform (IWHT). It has been shown that OTSM is capable of attaining a bit error ratio (BER) similar to that of orthogonal time-frequency space (OTFS) modulation at a lower complexity, since the saving of multiplication operations in the IWHT. Hence we provide its BER performance analysis and characterize its detection complexity. We commence by deriving its generalized input-output relationship and its unconditional pairwise error probability (UPEP). Then, its BER upper bound is derived in closed form under both ideal and imperfect channel estimation conditions, which is shown to be tight at moderate to high signal-to-noise ratios (SNRs). Moreover, a novel approximate message passing (AMP) aided OTSM detection framework is proposed. Specifically, to circumvent the high residual BER of the conventional AMP detector, we proposed a vector AMP-based expectation-maximization (VAMP-EM) detector for performing joint data detection and noise variance estimation. The variance auto-tuning algorithm based on the EM algorithm is designed for the VAMP-EM detector to further improve the convergence performance. The simulation results illustrate that the VAMP-EM detector is capable of striking an attractive BER vs. complexity trade-off than the state-of-the-art schemes as well as providing a better convergence. Finally, we propose AMP and VAMP-EM turbo receivers for low-density parity-check (LDPC)-coded OTSM systems. It is demonstrated that our proposed VAMP-EM turbo receiver is capable of providing both BER and convergence performance improvements over the conventional AMP solution.


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

The emerging orthogonal time frequency space (OTFS) modulation technique...

Low Complexity Detection of Spatial Modulation Aided OTFS in Doubly-Selective Channels

A spatial modulation-aided orthogonal time frequency space (SM-OTFS) sch...

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...

Single cell and multi-cell performance analysis of OFDM index modulation

This paper addresses the achievable rate of single cell and sum rate of ...

Space-Time Shift Keying Aided OTFS Modulation for Orthogonal Multiple Access

Space-time shift keying-aided orthogonal time frequency space modulation...

A Low Complexity MAP Detector for OTFS Modulation in Logarithmic Domain

Orthogonal time-frequency space (OTFS) has been confirmed to take advant...

A Two-stage Approach to Estimate CFO and Channel with One-bit ADCs

In this paper, we propose a two-stage approach to estimate the carrier f...

Please sign up or login with your details

Forgot password? Click here to reset