Results 21 to 30 of about 4,468,856 (284)
New bounds of wide‐gap frequency‐hopping sequences with frequency shift
Electronics Letters, 2022 With the rapid development of radar, the phenomenon of Doppler frequency shift is not rare. Frequency shift needs to be considered in order to accurately calculate the mutual interference between signals. Meanwhile, to reduce interference to the received
Qianhui Wei, Hongyu Han
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Blind Source Separation Method for Frequency-Hopping Signal in Synchronous Networking Under Underdetermined Condition [PDF]
Jisuanji gongcheng, 2020 To implement blind source separation of frequency-hopping signals in synchronous networking under underdetermined conditions,this paper proposes a frequency-hopping signal separation method based on the parallel factor analysis model and subspace ...
WANG Shaobo, GUO Ying, SUI Ping, LI Hongguang, YANG Xin
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Fast blind detection of short-wave frequency hopping signal based on MeanShift
Tongxin xuebao, 2022 In the complex short-wave channel environment, combined with time-frequency analysis technology, a fast blind detection algorithm of the connected domain labeled frequency hopping signals based on MeanShift algorithm was proposed to reduce the influence ...
Zhengyu ZHU +6 more
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Radio Frequency Fingerprinting for Frequency Hopping Emitter Identification
Applied Sciences, 2021 In a frequency hopping spread spectrum (FHSS) network, the hopping pattern plays an important role in user authentication at the physical layer. However, recently, it has been possible to trace the hopping pattern through a blind estimation method for ...
Jusung Kang +4 more
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Design and implementation of coherent FFH generator based on multiple parallel DDS
Dianzi Jishu Yingyong, 2018 For the new types of features of interference such as large interference power, wide frequency band and many styles, the adoption of a coherent fast frequency hopping system can improve the anti-interference ability of wireless communication systems.
Ni Xuanhao, Cong Yanchao, Wu Chunfei
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Noncoherent Multi-Way Relay Based on Fast Frequency-Hopping M-ary Frequency-Shift Keying [PDF]
, 2010 Information exchange among a group of users is implemented with the aid of fast frequency-hopping $M$-ary frequency-shift keying multi-way relay (FFH/MFSK MWR). The FFH/MFSK MWR scheme uses two time-slots per symbol for achieving the information exchange,
Cao, Jianfei +2 more
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IET Communications, 2012 Most of previous blind parameter estimation methods of frequency hopping (FH) signals with a single channel do not adapt to overlapped signals, whereas the multi-channel-based ones are computationally much too expensive. Moreover, all the single- and multiple-channel-based methods use batch processing techniques, and they are not able to give real-time
Zhang-Meng Liu +2 more
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Area spectral efficiency of soft-decision space–time–frequency shift-keying-aided slow-frequency-hopping multiple access [PDF]
, 2012 Slow-frequency-hopping multiple access (SFHMA) can provide inherent frequency diversity and beneficially randomize the effects of cochannel interference.
Ngo, Hoang Anh +3 more
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Tongxin xuebao, 2023 In order to remove interference from hybrid signals and sort each frequency hopping station signal, a multi frequency hopping network station sorting algorithm based on joint feature clustering was proposed.Firstly, short-time Fourier transform was ...
Zhengyu ZHU +4 more
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Sensors, 2023 Frequency hopping spread spectrum (FHSS) applies widely to communication and radar systems to ensure communication information and channel signal quality by tuning frequency within a wide frequency range in a random sequence.
Yuan-Pin Cheng +2 more
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