• Title/Summary/Keyword: BPSK

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Implementation of Single-Carrier BPSK Powerline Modem based on EIA-709.2-A PL (EIA-709.2-A PL에 근거한 단일 캐리어 BPSK 전력선 모뎀 구현)

  • Woo, Dae-Ho;Yoo, Young-Gyu;Byun, Youn-Shik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.4A
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    • pp.325-329
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    • 2007

  • In this paper, the modem based on EIA-709.2-A PL of powerline communication techniques which are considered to be important technologies for in-home control network systems was implemented via VHDL. In order to have the robust properties against existing noises over powerline channels, the information data using eight symbols was transmitted by transmitter and the receiver is composed of matched filter, averager, decision and detection parts in order to detect the right data from the received signals. The implemented PLC transceiver was downloaded into Altera's EP1S25C672 FPGA and the operation was verified successfully.

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Effects of Multione Interference on the Spectrum-Overlapped DS/SFH-SSMA System (스펙트럼 겹침이 있는 DS/SFH-SSMA 시스템의 다중톤 영향 분석)

  • Park, Jeong-Min;Ryu, Ho-Jin;Kim, Kie-Keun;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.3
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    • pp.446-450
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    • 2001

  • Performance of spectrum-overlapped BPSK DS/SFH-SSMA communication system is considered in MAI and MTI channel. SSMA system is studied that the frequency spectrums of DS spread signals are overlapped. The increase of overlapping makes ACI and processing gain larger simultaneously. Therefore, BER performance can be optimized by controlling the amount of overlapping. BER equation are derived far the overlapping BPSK DS/SFH-SSMA communication system in multitone interference channel. From the numerical analyses and the simulation results, it can be concluded that the BER performance is considerably improved in optimized overlapping system.

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Modulation Recognition of BPSK/QPSK Signals based on Features in the Graph Domain

  • Yang, Li;Hu, Guobing;Xu, Xiaoyang;Zhao, Pinjiao
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.16 no.11
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    • pp.3761-3779
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    • 2022

  • The performance of existing recognition algorithms for binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) signals degrade under conditions of low signal-to-noise ratios (SNR). Hence, a novel recognition algorithm based on features in the graph domain is proposed in this study. First, the power spectrum of the squared candidate signal is truncated by a rectangular window. Thereafter, the graph representation of the truncated spectrum is obtained via normalization, quantization, and edge construction. Based on the analysis of the connectivity difference of the graphs under different hypotheses, the sum of degree (SD) of the graphs is utilized as a discriminate feature to classify BPSK and QPSK signals. Moreover, we prove that the SD is a Schur-concave function with respect to the probability vector of the vertices (PVV). Extensive simulations confirm the effectiveness of the proposed algorithm, and its superiority to the listed model-driven-based (MDB) algorithms in terms of recognition performance under low SNRs and computational complexity. As it is confirmed that the proposed method reduces the computational complexity of existing graph-based algorithms, it can be applied in modulation recognition of radar or communication signals in real-time processing, and does not require any prior knowledge about the training sets, channel coefficients, or noise power.

  • https://doi.org/10.3837/tiis.2022.11.016 인용 PDF KSCI HTML

Low Computational FFT-based Fine Acquisition Technique for BOC Signals

  • Kim, Jeong-Hoon;Kim, Binhee;Kong, Seung-Hyun
    • Journal of Positioning, Navigation, and Timing
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    • v.11 no.1
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    • pp.11-21
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    • 2022

  • Fast Fourier transform (FFT)-based parallel acquisition techniques with reduced computational complexity have been widely used for the acquisition of binary phase shift keying (BPSK) global positioning system (GPS) signals. In this paper, we propose a low computational FFT-based fine acquisition technique, for binary offset carrier (BOC) modulated BPSK signals, that depending on the subcarrier-to-code chip rate ratio (SCR) selectively utilizes the computationally efficient frequency-domain realization of the BPSK-like technique and two-dimensional compressed correlator (BOC-TDCC) technique in the first stage in order to achieve a fast coarse acquisition and accomplishes a fine acquisition in the second stage. It is analyzed and demonstrated that the proposed technique requires much smaller mean fine acquisition computation (MFAC) than the conventional FFT-based BOC acquisition techniques. The proposed technique is one of the first techniques that achieves a fast FFT-based fine acquisition of BOC signals with a slight loss of detection probability. Therefore, the proposed technique is beneficial for the receivers to make a quick position fix when there are plenty of strong (i.e., line-of-sight) GNSS satellites to be searched.

  • https://doi.org/10.11003/JPNT.2022.11.1.11 인용 PDF KSCI HTML