Wideband Time Frequency Coding

Yang, Kathleen; D’Oliveira, Rafael G. L.; Salamatian, Salman; Médard, Muriel

doi:10.1109/pimrc48278.2020.9217338

Cited by 3 publications

(9 citation statements)

References 11 publications

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“…WTFC is a modulation scheme that is inspired by I-FSK and combines FSK with PPM [1]. The signal is comprised of Given a bandwidth B, a symbol time T s , and an adjacent frequency separation ∆ f = f i+1 − f i = q/(T s − T d ) where q ∈ N, there are a total of M = B(T s − T d )/q possible frequencies that can be transmitted.…”

Section: B Wideband Time Frequency Coding Signalmentioning

confidence: 99%

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Wideband Time Frequency Coding

Yang¹,

Salamatian²,

D'Oliveira³

et al. 2022

Preprint

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Section: B Wideband Time Frequency Coding Signalmentioning

confidence: 99%

“…Manuscript received ; revised . Part of this work has been previously presented in part in PIMRC 2019 [1]. In this work, we expand into further detail on how changing the parameters of WTFC impacts its capacity, and introduce large-scale fading and the shadowing effect to the channel model.…”

Section: Introductionmentioning

confidence: 99%

Wideband Time Frequency Coding

Yang¹,

Salamatian²,

D'Oliveira³

et al. 2022

Preprint

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“…WTFC builds on top of I-FSK and incorporates pulse position modulation (PPM) with I-FSK, thus allowing for information to be encoded in the time period that the signal is transmitted. Under the same channel conditions, symbol time, and duty cycle, WTFC's capacity is greater than I-FSK's with the trade off of having a greater symbol error rate [10].…”

Section: Introductionmentioning

confidence: 99%

“…WTFC combines FSK with a duty cycle, and incorporates PPM into I-FSK. The time period in which the signal is transmitted is unknown to the receiver [10]. Using WTFC, only a single frequency is transmitted.…”

Section: Introductionmentioning

confidence: 99%

“…Here, A is the amplitude of the transmitted signal, f l is the frequency of the tone being transmitted, k is the index for the time period in which the tone is transmitted with k ∈ [0, 1/θ − 1], and P is the average transmit power. Assuming the same multipath fading channel described in the previous section, the channel output is expressed as [10]…”

Section: Introductionmentioning

confidence: 99%

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Analog Compressed Sensing for Sparse Frequency Shift Keying Modulation Schemes

Yang¹,

González²,

Eldar³

et al. 2022

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There is a growing interest in signaling schemes that operate in the wideband regime due to the crowded frequency spectrum. However, a downside of the wideband regime is that obtaining channel state information is costly, and the capacity of previously used modulation schemes such as code division multiple access and orthogonal frequency division multiplexing begins to diverge from the capacity bound without channel state information. Impulsive frequency shift keying and wideband time frequency coding have been shown to perform well in the wideband regime without channel state information, thus avoiding the costs and challenges associated with obtaining channel state information. However, the maximum likelihood receiver is a bank of frequency-selective filters, which is very costly to implement due to the large number of filters. In this work, we aim to simplify the receiver by using an analog compressed sensing receiver with chipping sequences as correlating signals to detect the sparse signals. Our results show that using a compressed sensing receiver allows for the simplification of the analog receiver with the trade off of a slight degradation in recovery performance. For a fixed frequency separation, symbol time, and peak SNR, the performance loss remains the same for a fixed ratio of number of correlating signals to the number of frequencies.

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