• Title/Summary/Keyword: noncoherent detection

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Performance Analysis of a Noncoherent OOK UWB System Based on Power Detection in Indoor Wireless Channels (실내 무선 채널에서 전력검출 기반 Noncoherent OOK UWB 시스템의 성능 분석)

  • Oh Jongok;Yang Suckchel;Shin Yoan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.11C
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    • pp.1498-1509
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    • 2004
  • In this paper, we evaluate the performance of a noncoherent OOK (On-Off Keying) UWB (Ultra Wide Band) system based on power detection with noise power calibration and noise power windowing for ubiquitous sensor network applications in typical indoor wireless channels. Utilizing noise power calibration and noise power windowing, the current noise information can be initially or adaptively provided to determine suitable detection threshold value for signal demodulation. Simulation results show that the noncoherent OOK UWB system using noise power calibration achieves good BER (Bit Error Rate) performance which is favorably comparable to that of the system using the ideal adaptive threshold, while maintaining simple receiver structure. However, despite the serious loss of the data transmission rate, the performance improvement by noise power windowing is not so remarkable. furthermore, these performance results are similarly maintained in BEE 802.15 Task Group 3a UWB indoor channel model, and it is also revealed that the BER performance can be significantly improved by increasing the pulse repetition rate.

A Selective Detection Scheme based on Pulse Repetition for Noncoherent UWB systems (Noncoherent UWB 시스템을 위한 펄스 반복 전송 기반의 선택적 검출 기법)

  • Kim, Jae-Woon;Park, Young-Jin;Lee, Sun-Woo;Lee, Jae-Jin;Seo, Chul-Hun;Shin, Yo-An
    • Proceedings of the IEEK Conference
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    • 2007.07a
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    • pp.185-186
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    • 2007
  • In this paper, We propose the selective detection scheme based on pulse repetition considering Bit Error Rate (BER) performance and complexity of noncoherent Ultra Wide Band (UWB) systems. To consider system complexity, the proposed scheme transmits the UWB signals by pulse repetition at the transmitter, like the conventional Pulse Repetition Coding (PRC). However, to effectively improve BER performance of the system the proposed scheme performs selective detection by estimating the Signal-to-Noise Ratio (SNR) of the received pulse-repeated signal at the receiver. Hence, the proposed scheme effectively improves BER performance of the noncoherent UWB systems without increase of the system complexity, as compared to the conventional PRC algorithm.

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Performance Analysis of the Clutter Map CFAR Detector with Noncoherent Integration

  • Kim, Chang-Joo;Lee, Hyuck-Jae
    • ETRI Journal
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    • v.15 no.2
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    • pp.1-9
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    • 1993
  • Nitzberg has analyzed the detection performance of the clutter map constant false alarm rate (CFAR) detector using single pulse. In this paper, we extend the detection analysis to the clutter map CFAR detector that employs M-pulse noncoherent integration. Detection and false alarm probabilities for Swerling target models are derived. The analytical results show that the larger the number of integrated pulses M, the higher the detection probability. On the other hand, the analytical results for Swerling target models show that the detection performance of the completely decorrelated target signal is better than that of the completely correlated target.

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A Noncoherent UWB Communication System for Low Power Applications

  • Yang, Suck-Chel;Park, Jung-Wan;Moon, Yong;Lee, Won-Cheol;Shin, Yo-An
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.4 no.3
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    • pp.210-216
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    • 2004
  • In this paper, we propose a noncoherent On-Off Keying (OOK) Ultra Wide Band (UWB) system based on power detection with noise power calibration for low power applications. The proposed UWB system achieves good bit error rate performance which is favorably comparable to that of the system using the ideal adaptive threshold, while maintaining simple receiver structure, In addition, low power Analog Front-End (AFE) blocks for the proposed noncoherent UWB transceiver are proposed and verified using CMOS technology. Simulation results on the pulse generator, delay time generator and 1-bit Analog-to-Digital (AID) converter show feasibility of the proposed UWB AFE system.

Noncoherent adaptive code acquisition scheme using a differential detection technique in DS/SS systems (DS/SS 시스템에서의 차등 검파 기법을 이용한 비동기식 적응형 코드 위상 검출 방법)

  • 류탁기;권종형;전형구;홍대식;강창언
    • Proceedings of the IEEK Conference
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    • 2000.11a
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    • pp.77-80
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    • 2000
  • Adaptive filter based code acquisition scheme offers a fast acquisition with a low error probability. However, it has been studied only under a coherent environment. In this paper, the noncoherent adaptive code acquisition scheme employing a differential detection technique is proposed. For the proposed scheme, system probabilities and the mean acquisition time are analyzed numerically. Simulation results show that the proposed system outperforms over the conventional matched filter by 2-4 ㏈ under AWGN channel for 16 taps.

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Noncoherent Detection of Orthogonal Modulation Combined with Alamouti Space-Time Coding

  • Simon, Marvin K.;Wang, Ji-Bing
    • Journal of Communications and Networks
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    • v.5 no.2
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    • pp.124-134
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    • 2003
  • In this paper, we investigate the error probability performance of noncoherently detected orthogonal modulation combined with Alamouti space-time block coding. We find that there are two types of pair-wise error probabilities that characterize the performance. We employ methods that allow a direct evaluation of exact, closed-form expressions for these error probabilities. Theoretical as well as numerical results show that noncoherent orthogonal modulation combined with space-time block coding (STBC) achieves full spatial diversity. We derive an expression for approximate average bit error probability for-ary orthogonal signaling that allows one to show the tradeoff between increased rate and performance degradation.

Performance of M-ary Turbo Coded Synchronous FHSS Multiple Access Networks with Noncoherent MFSK under Rayleigh Fading Channels

  • Hong, Sungnam;Cheun, Kyungwhoon;Lim, Hyuntack;Cho, Sunghye
    • Journal of Communications and Networks
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    • v.15 no.6
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    • pp.601-605
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    • 2013
  • The performance of M-ary turbo coded synchronous, fast frequency-hopping spread spectrum multiple-access (FHSS-MA) networks with M-ary frequency shift keying (MFSK) and noncoherent detection is analyzed under Rayleigh fading. Results indicate that M-ary turbo codes dramatically enhance the performance of FHSS-MA networks using MFSK compared to binary turbo codes.

Design of a Timing Estimator Algorithm for 2.45GHz LR-WPAM Receiver (2.45GHz LR-WPAN 수신기를 위한 Timing Estimator 알고리즘의 설계)

  • Kang Shin-Woo;Do Joo-Hyun;Park Tha-Joon;Choi Hyung-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.3A
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    • pp.282-290
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    • 2006
  • In this paper, we propose an enhanced Timing Estimator algorithm for 2.45GHz LR-WPAN receiver. Because an expensive and highly efficient oscillator can't be used for low-cost implementation, a Timing Estimator algorithm having stable operation in the channel environment with center frequency tolerance of 80 ppm is required. To enhance the robustness to frequency offset and the stability of receiver performance, multiple delay differential filter is adopted. By utilizing the characteristic that the correlation result between the output signal of Multiple delay differential filter and reference signal is restricted on the In-phase part of the correlator output, a coherent detection scheme instead of the typical noncoherent one is adopted for Timing Estimator. The application of the coherent detection scheme is suitable for LR-WPAN receiver aimed at low-cost, low-power, and low-complexity, since it can remove performance degradation due to squaring loss of I/Q squaring operation and decrease implementation complexity. Computer simulation results show that the proposed algorithm achieved performance improvement compared with the differential detection-based noncoherent scheme by 2dB in average.

ODSB and OSSB Error Performance Analysis of MMoF Systems in Rician Fading Channel

  • Yun, Chang-Ho;Cho, Tae-Sik;Kim, Kiseon
    • Proceedings of the IEEK Conference
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    • 2003.07a
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    • pp.182-185
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    • 2003
  • Error performance of two modulation schemes of millimeter-wave over fiber (MMoF) system i.e., optical double side band (ODSB) and optical single side band (OSSB) modulations is analyzed under Rician fading. Bit error rates (BER) of two detection techniques i.e., coherent and noncoherent detection are also compared in Rician fading. In aspect of error performance, ODSB modulation scheme has better BER than OSSB modulation scheme has under Rician fading. On the other hand, OSSB modulation scheme is advantageous in case of considering high bandwidth efficiency and small power degradation. Coherent detection technique is proper in Rician fading, because coherent detection provides more SNR gain whether fading is serious or not. Noncoherent detection can be applied when we need a simple receiver structure.

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Study on signal processing techniques for low power and low complexity IR-UWB communication system using high speed digital sampler (고속 디지털 샘플러 기술을 이용한 저전력, 저복잡도의 초광대역 임펄스 무선 통신시스템 신호처리부 연구)

  • Lee, Soon-Woo;Park, Young-Jin;Kim, Kwan-Ho
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.12 s.354
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    • pp.9-15
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    • 2006
  • In this paper, signal processing techniques for noncoherent impulse-radio-based UWB (IR-UWB) communication system are proposed to provide system implementation of low power consumption and low complexity. The proposed system adopts a simple modulation technique of OOK (on-oft-keying) and noncoherent signal detection based on signal amplitude. In particular, a technique of a novel high speed digital sampler using a stable, lower reference clock is developed to detect nano-second pulses and recover digital signals from the pulses. Also, a 32 bits Turyn code for data frame synchronization and a convolution code as FEC are applied, respectively. To verify the proposed signal processing techniques for low power, low complexity noncoherent IR-UWB system, the proposed signal processing technique is implemented in FPGA and then a short-range communication system for wireless transmission of high quality MP3 data is designed and tested.