Low-Complexity Iterative Detection for Orthogonal Time Frequency Space Modulation

Raviteja, P.; Phan, Khoa T.; Jin, Qianyu; Hong, Yi; Viterbo, Emanuele

doi:10.48550/arxiv.1709.09402

Cited by 8 publications

(13 citation statements)

References 7 publications

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“…Assuming the windows used in modulation (W tx [n, m]) and demodulation (W rx [n, m]) to be rectangular, the input-output relation in (10) for the above channel can be derived as [11] h w (τ , ν…”

Section: Vectorized Formulation Of the Input-output Relationmentioning

confidence: 99%

“…An equivalent channel matrix representation and a two-stage equalizer for OTFS are presented in [10]. Vectorized formulations of the inputoutput relation describing OTFS modulation and demodulation are presented in [11], [12]. A message passing based OTFS signal detection scheme based on the vectorized formulation is presented in [11].…”

Section: Introductionmentioning

confidence: 99%

“…Vectorized formulations of the inputoutput relation describing OTFS modulation and demodulation are presented in [11], [12]. A message passing based OTFS signal detection scheme based on the vectorized formulation is presented in [11]. MIMO OFDM-based OTFS and its vectorized formulation that can enable MIMO OTFS analysis and implementation are presented in [13].…”

Section: Introductionmentioning

confidence: 99%

“…Second, we relax the perfect knowledge of the equivalent channel matrix and present a pseudo-noise (PN) sequence pilot based channel estimation scheme in the delay-Doppler domain. In this context, we note that the detection performance of OTFS reported in the literature (e.g., [7], [11]) assume perfect channel knowledge.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On OTFS Modulation for High-Doppler Fading Channels

Murali

Chockalingam

2018

2018 Information Theory and Applications Workshop (ITA)

210

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Orthogonal time frequency space (OTFS) modulation is a 2-dimensional (2D) modulation scheme designed in the delay-Doppler domain, unlike traditional modulation schemes which are designed in the time-frequency domain. Through a series of 2D transformations, OTFS converts a doubly-dispersive channel into an almost non-fading channel in the delay-Doppler domain. In this domain, each symbol in a frame experiences an almost constant fade, thus achieving significant performance gains over existing modulation schemes such as OFDM. The sparse delay-Doppler impulse response which reflects the actual physical geometry of the wireless channel enables efficient channel estimation, especially in high-Doppler fading channels. This paper investigates OTFS from a signal detection and channel estimation perspective, and proposes a Markov chain Monte-Carlo sampling based detection scheme and a pseudo-random noise (PN) pilot based channel estimation scheme in the delay-Doppler domain.

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Section: Vectorized Formulation Of the Input-output Relationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On OTFS Modulation for High-Doppler Fading Channels

Murali

Chockalingam

2018

2018 Information Theory and Applications Workshop (ITA)

210

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“…This work is inspired by the landmark paper [1], which was the first to propose a continuous-time formulation of a single-antenna OTFS modulation. Recently, [3] presents a discrete-time formulation of a single-antenna OTFS system by sampling the continuous-time channel for the case when the transmit and receive window functions are rectangular. In [4], a matrix-form discrete-time formulation of a single-antenna transceiver with rectangular windows is presented.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Discrete-Time MIMO OFDM-Based Orthogonal Time Frequency Space Modulation

RezazadehReyhani

Farhang

et al. 2018

2018 IEEE International Conference on Communications (ICC)

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Orthogonal Time Frequency Space (OTFS) is a novel modulation scheme designed in the Doppler-delay domain to fully exploit time and frequency diversity of general timevarying channels. In this paper, we present a novel discrete-time analysis of OFDM-based OTFS transceiver with a concise and vectorized input-output relationship that clearly characterizes the contribution of each underlying signal processing block in such systems. When adopting cyclic prefix in the time domain, our analysis reveals that the proposed MIMO OTFS and OFDM systems have the same ergodic capacity despite the well-known fact that the former has great advantages in low-complexity receiver design for high Doppler channels. The proposed discretetime vectorized formulation is applicable to general fast fading channels with arbitrary window functions. It also enables practical low-complexity receiver design for which such a concise formulation of the input-output relationship is of great benefits.

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Low Complexity Modem Structure for OFDM-Based Orthogonal Time Frequency Space Modulation

Farhang

RezazadehReyhani

Doyle

et al. 2018

IEEE Wireless Commun. Lett.

194

122

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Orthogonal time frequency space (OTFS) modulation is a two-dimensional signaling technique that has recently emerged in the literature to tackle the time-varying (TV) wireless channels. OTFS deploys the Doppler-delay plane to multiplex the transmit data where the time variations of the TV channel are integrated over time and hence the equivalent channel relating the input and output of the system boils down to a time-invariant one. This signaling technique can be implemented on the top of a given multicarrier waveform with the addition of precoding and post-processing units to the modulator and demodulator. In this paper, we present discrete-time formulation of an OFDMbased OTFS system. We argue against deployment of window functions at the OTFS transmitter in realistic scenarios and thus limit any sort of windowing to the receiver side. We study the channel impact in discrete-time providing deeper insights into OTFS systems. Moreover, our derivations lead to simplified modulator and demodulator structures that are far simpler than those in the literature.

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Low-Complexity Iterative Detection for Orthogonal Time Frequency Space Modulation

Cited by 8 publications

References 7 publications

On OTFS Modulation for High-Doppler Fading Channels

On OTFS Modulation for High-Doppler Fading Channels

Analysis of Discrete-Time MIMO OFDM-Based Orthogonal Time Frequency Space Modulation

Low Complexity Modem Structure for OFDM-Based Orthogonal Time Frequency Space Modulation

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