Multicode Signaling in a Filter Bank Multicarrier Spread Spectrum System and Its Application to HF Communications

Haab, David B.; Sego, Thomas Cameron; Holschuh, Tom V.; Moradi, Hussein; Farhang‐Boroujeny, Behrouz

doi:10.1109/ojcoms.2023.3240374

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…Each preamble period contains Z = 16 symbols, and the pilot symbol sequence is periodic with a period of 2 pilots. Data encoding is performed using orthogonal multicodes [31]. The delay search range of the receiver spans 10 ms, leading to M = 641 samples.…”

Section: A Case Study: Results With Fbmc-ss Modulation Over a Skywave...mentioning

confidence: 99%

A Method of Estimating Sparse and Doubly-Dispersive Channels

Hunt,

Haab,

Moradi

et al. 2023

MILCOM 2023 - 2023 IEEE Military Communications Conference (MILCOM)

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Using pilot-symbol assisted modulation, we develop a method to acquire channel information from signals received in low-SNR environments. First, we estimate the power-delay profile (PDP) of the channel. Then, we apply information from that estimate to obtain the channel coefficients only at points where the PDP is nonzero. Because we estimate a reduced number of channel coefficients, the complexity and estimation error are simultaneously reduced. We present a case study of the proposed estimation method when applied to a wideband skywave high frequency (HF) channel. Through this study, we find that the proposed approach has significantly enhanced performance when compared to an existing method that does incorporate sparsity information into its estimate. The improved low-SNR performance of the proposed estimator makes it particularly well suited for spread-spectrum and underlay waveforms.

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Section: A Case Study: Results With Fbmc-ss Modulation Over a Skywave...mentioning

confidence: 99%

A Method of Estimating Sparse and Doubly-Dispersive Channels

Hunt,

Haab,

Moradi

et al. 2023

MILCOM 2023 - 2023 IEEE Military Communications Conference (MILCOM)

Self Cite

View full text Add to dashboard Cite

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Virtual Array-Based Signal Detection and Carrier Frequency Offset Estimation in a Multistatic Collaborative Passive Detection System

Cao,

Ma,

Zhang

et al. 2024

Remote Sensing

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To tackle the problem of difficult signal detection and carrier frequency synchronization faced by wireless communication among stations of the multistatic passive detection system in interference environments, an adaptive signal detection and carrier frequency offset (CFO) estimation method based on a virtual array is proposed in this paper. This is a data-aided method that utilizes a training sequence composed of three segments of sub-training sequences with different symbols. This method first uses spatial spectrum estimation to obtain the coarse frequency estimations of interference signals and CFO from virtual array signals constructed from the first two sub-training sequences. Then, beamforming is conducted accordingly on the virtual array signals constructed from the third sub-training sequence to suppress the in-band interferences and protrude the expected signal. Finally, improved performance of signal detection and CFO estimation is obtained with the beamformed signals. Simulation experiments show that a missed detection probability as low as 1 × 10−4, with a false detection probability of 1 × 10−3, can be obtained under a signal-to-interference ratio (SIR) of −10 dB and Eb/N0 of 1 dB. Moreover, the proposed method can also simultaneously achieve a CFO estimation error that is lower than 3%, with the condition of Eb/N0 being as low as −5 dB under different SIRs. Simulation results validate the proposed method and demonstrate the promising application prospects of the proposed method in networked passive detection scenarios.

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Research and Design of BPM Shortwave Time Signal Modulation Technology Based on Chirp

Yuan,

Li,

Yan

et al. 2024

Remote Sensing

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The shortwave time service system is a vital land-based wireless time service solution, serving as a supplement and backup to the global navigation satellite system. It ensures that time users can access reliable timings, especially in extreme situations. However, the current BPM shortwave time service signal in China faces issues such as insufficient anti-interference reception capabilities and poor timing accuracy. This paper capitalizes on the advantages of Chirp signals and explores a new modulation technology for BPM shortwave time signals that is compatible with the existing modulation system. A Dual Chirp Time-Division Combined Modulation (DCTDCM) scheme is proposed for broadcasting two time signals: Coordinated Universal Time (UTC) and Universal Time 1 (UT1). Furthermore, an in-depth study of the receiving method for this scheme is conducted, with detailed design of its parameters. The designed DCTDCM signals offer a spread spectrum gain of 24 dB and a multipath resolution capability of at least 125 μs, significantly enhancing the anti-interference reception and anti-multipath attenuation capabilities of shortwave time signals. As a result, the availability and timing accuracy of shortwave time signals are substantially improved. Finally, extensive comparative experiments on reception performance validate the effectiveness of this approach.

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Multicode Signaling in a Filter Bank Multicarrier Spread Spectrum System and Its Application to HF Communications

Cited by 3 publications

References 29 publications

A Method of Estimating Sparse and Doubly-Dispersive Channels

A Method of Estimating Sparse and Doubly-Dispersive Channels

Virtual Array-Based Signal Detection and Carrier Frequency Offset Estimation in a Multistatic Collaborative Passive Detection System

Research and Design of BPM Shortwave Time Signal Modulation Technology Based on Chirp

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