Orthogonal Time Sequency Multiplexing Modulation: Analysis and Low-Complexity Receiver Design
arXiv:2104.05939 · doi:10.1109/TWC.2021.3088479
Abstract
This paper proposes orthogonal time sequency multiplexing (OTSM), a novel single carrier modulation scheme that places information symbols in the delay-sequency domain followed by a cascade of time-division multiplexing (TDM) and Walsh-Hadamard sequence multiplexing. Thanks to the Walsh Hadamard transform (WHT), the modulation and demodulation do not require complex domain multiplications. For the proposed OTSM, we first derive the input-output relation in the delay-sequency domain and present a low complexity detection method taking advantage of zero-padding. We demonstrate via simulations that OTSM offers high performance gains over orthogonal frequency division multiplexing (OFDM) and similar performance to orthogonal time frequency space (OTFS), but at lower complexity owing to WHT. Then we propose a low complexity time-domain channel estimation method. Finally, we show how to include an outer error control code and a turbo decoder to improve error performance of the coded system.
References in corpus (4)
- Channel Estimation for Orthogonal Time Frequency Space (OTFS) Massive MIMO
- Low Complexity Iterative Rake Decision Feedback Equalizer for Zero-Padded OTFS systems
- A Simple Two-stage Equalizer With Simplified Orthogonal Time Frequency Space Modulation Over Rapidly Time-varying Channels
- Low-Complexity Equalization for Orthogonal Time and Frequency Signaling (OTFS)
Cited by in corpus (6)
- From OTFS to AFDM: A Comparative Study of Next-Generation Waveforms for ISAC in Doubly-Dispersive Channels
- Performance Analysis and Approximate Message Passing Detection of Orthogonal Time Sequency Multiplexing Modulation
- OTFS Channel Estimation and Detection for Channels with Very Large Delay Spread
- Performance Analysis of OTSM under Hardware Impairments and Imperfect CSI
- CDMA/OTFS Sensing Outperforms Pure OTFS at the Same Communication Throughput
- Timing Misalignment and Its Impact on OTFS and Other Delay-Based Waveforms