• Title/Summary/Keyword: Receiver sensitivity

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A Study on the Reception Sensitivity of the Optical Receiver with the Order Change of the Optical Filter in Optical Preamplifier System (광 전치 증폭시스템에서 광필터의 차수변화에 따른 광수신기의 수신감도에 관한 연구)

  • Ra, Yoo-Chan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.3
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    • pp.218-223
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    • 2016
  • This study examined the order of the Butterworth filter for the correlation on the sensitivity of the receiver in the receiver of an optical system. In the general case, the sensitivity of the receiver is increased if the order of the filter was increased more. This is because increasing the order of the filter response of the normalized frequency of the filter is similar to the rectangular wave. For that reason, the method used to increase the order of the filter increases the sensitivity of the receiver. On the other hand, a method of increasing the order of the filter and makes the system complicated increases the cost of the system. This study examined the correlation between the order of the sensitivity of the receiver filter and to configure the system by simply looking for ways to reduce the cost of the system. The simulation results showed that increasing the order of the filter resulted in a receiver that can determine if the sensitivity is raised. In addition, the order of the Butterworth filter range that does not reduce the sensitivity of the receiver was 2. Therefore, it will be possible to implement an inexpensive optical system of the receiver using the data from this study.

Carrier Sensing Techniques for Long Range Internet of Things (장거리 사물인터넷을 위한 케리어 센싱 기술)

  • Lee, Il-Gu
    • Journal of the Korea Convergence Society
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    • v.9 no.8
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    • pp.33-39
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    • 2018
  • In the Internet of Things (IoT) era, objects are connected to each other by wired and wireless networks, and information is exchanged whenever necessary. Channel and network environments change over time; thus, a carrier sensing function that identifies whether signals containing information are present in the channel is essential. The carrier sensing circuit of a wireless communication system determines the receiver sensitivity, and the receiver sensitivity is closely related to the service coverage and service quality of the system. As the receiver sensitivity decreases, the service coverage increases but it becomes sensitive to noise. However, as the receiver sensitivity increases, the service coverage decreases but it becomes insensitive to the noise. Therefore, carrier sensing design and optimization are very important from the viewpoint of the receiver sensitivity and noise sensitivity. This paper proposes an effective carrier sensing technique from the viewpoint of the receiver sensitivity for the long range IoT.

An Analysis of Receiving Sensitivity of PIN Receiver for Optical Communication System (광통신시스템의 PIN 수신기 수신감도 해석)

  • Kim, Sun-Yeob
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.5
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    • pp.2272-2278
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    • 2011
  • It is essential to various evaluate about statistic character of the signal and additional noise for optimization of the optical communication system. We expressed various error probability with the m which was bandwidth and a bit numerical function and carried out performance evaluation of a PIN receiver. This research analyzed the receiving sensitivity of the PIN receiver and verified reception sensitivity through computer simulation in the optical communication system. As a result, the receiving sensitivity for PIN receiver are $9.2{\times}10^4$ photon/bit for given error probability.

An Initial Synchronization Method to Enhance Receive Sensitivity of the GPS Receiver for Reference Stations (기준국용 GPS 수신기의 수신감도 향상을 위한 초기동기 방법)

  • Park Sang-Hyun;Shin Jae-Ho;Park Jeong-Yeol
    • 한국정보통신설비학회:학술대회논문집
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    • 2006.08a
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    • pp.235-240
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    • 2006
  • In order to enhance receive sensitivity in noisy environment, the previous initial synchronization method of GPS receiver for reference stations adopts not only the coherent integration method but also the non-coherent integration method. However, the previous GPS initial synchronization method causes the non-coherent integration loss, which is a dominant factor among the signal acquisition losses in noisy environment. And the non-coherent integration loss increases with the strength of noise signal. In this pa-per, a GPS initial synchronization method is proposed to enhance receive sensitivity of GPS receiver for reference stations in noisy environment. This paper presents that the proposed GPS initial synchronization method suppresses the non-coherent integration loss. Furthermore, with regard to the mean acquisition time, it is shown that the number of the search cells of the proposed GPS initial synchronization method is much fewer than that of the previous GPS initial synchronization method.

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Implementation of the Real-time Measurement System of Receiver Sensitivity for a Laser Range Finder (레이저 거리 측정기용 광 검출기 수신 감도 실시간 측정 시스템 구현)

  • Lee, Young-Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.1
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    • pp.108-111
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    • 2016
  • We propose the method for measuring sensitivity of optical receiver of a long-range laser range finder in real-time. The sensitivity of the detector can be calculated using the detected voltage of the reference sensor, the area of the reference sensor and the transmittance ratio of neutral density filters. To evaluate the performance of the proposed method, we implemented a system and performed experiments. As a result, this system can be measured from 2nW to $113{\mu}W$. With this system, we measured the sensitivity of 37nW and 7nW with PIN PD and APD sample, respectively. This system has the advantage for the performance test of an optical sensor module in the long-range laser range finder.

The Analysis of important factors for improving the performance of DIFM Receiver (DIFM 수신기의 성능향상 결정요소 분석)

  • Ku, Ki-Young;Choi, Hyun-Chul;An, Hyeon-Kwan;Park, Cheol-Sun;Lim, Joong-Soo
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.198-202
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    • 2003
  • An engineer prefers DIFM receiver which is superior to instantaneous response rather than superheterodyne receiver which has a scan rate in normal wide band receiver designing. But DIFM receiver has weak point in sensitivity and continuous wave signal because of special environments. In this paper we propose the method which is certificated through simulation and prototype testing to improve sensitivity of DIFM receiver. And we analyze the important factors of DIFM receiver from our results.

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Impact of Solar Irradiance on the Receiver Sensitivity of Free-Space Optical Communication Systems (주광이 무선 광통신 시스템의 수신 감도에 미치는 영향)

  • Park, Gihong;Kim, Hoon
    • Korean Journal of Optics and Photonics
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    • v.31 no.6
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    • pp.259-267
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    • 2020
  • We evaluate the degradation of receiver sensitivity induced by direct and indirect exposure to solar irradiance in free-space optical communication systems. For this purpose, we calculate the variances of numerous noise components arising from solar irradiance, and then estimate the receiver sensitivity penalties for intensity-modulation/direct-detection and coherent systems. The results show that the penalties are less than 1.3 dB when indirect sunlight impinges on the detector, regardless of the system. However, the sensitivity penalties are estimated to be larger than 30 dB when the sunlight is directly incident upon the receiver. These penalties are barely reduced if we insert an optical polarizer, or if we adjust the bandwidth of an optical filter at the receiver to be as narrow as the signal's bandwidth.

Receive Sensitivity Improvement of Wavelength Division Multiplexing System (파장 분할 다중화 시스템의 수신감도 개선)

  • Kim, Sun-Youb;Park, Hyoung-Keun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.3
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    • pp.579-585
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    • 2006
  • In this study, we analysis an optical receivers using the optical preamplifier in a spectrum-sliced WDM systems. The average numbers of photons/bit, for an $10^{-9}$ error probability, counts using the OOK and FSK transmission. As a result, the theoretical sensitivity for PIN receiver and optical preamplifier receiver are approximately $9.2\times10^4\;and\;7.2\times10^2$ in the m=20, respectively. Also, the average numbers of photons/bit, for and given error probability, theoretical receiver sensitivity for Gaussian method and k-square method are approximately $9\times10^2\;and\;2.16\times10^2$ in the m=40, respectively. And the average numbers of photons/bit, for an given error probability, theoretical receiver sensitivity, OOK and FSK transmission are approximately $1.9\times10^2\;and\;3.1\times10^2$ in the m=20, respectively.

A Study on Receiver Sensitivity Measurement using Pilot $E_c/I_o$ Compensation Method at CDMA Communication Network (CDMA 기지국에서 Pilot $E_c/I_o$ 보상기법을 이용한 수신감도 측정에 관한 연구)

  • Jeong, Ki-Hyeok;Ra, Keuk-Hwan
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.8
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    • pp.9-16
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    • 2007
  • Currently, the measurement of RF parameters for a base station in operation is typically limited to easily measured forward path items. In this paper, the forward monitoring ports of base stations are used to measure the reverse RF performance. The system has been implemented and effectiveness has been proven on an operating base station. The receiver sensitivity is measured using an internal CDMA modem which is used to monitor the output power based on closed loop power control when the modem is connected to the base station via a voice call. In order to improve accuracy, in addition to the modem Tx adjust(TxAdj) parameter, the detector's actual measurement is used. For accurate receiver sensitivity, the measurement should be made when there is no traffic which is not possible on an operating base station. Therefore, pilot channel chip energy to received signal power spectral density ratio$(E_c/I_o)$ compensation method is used to offset the receiver sensitivity degradation with voice traffic increase.

Design and Implementation of Receiver for X-Band Transponder (X-Band 트랜스폰더 수신기의 설계 및 제작)

  • 이원우;조경준;김상희;김종헌;이종철;이병제;김남영
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.6
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    • pp.507-513
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    • 2002
  • In this paper, the receiver using Heterodyne type is designed and implemented for a pulse radar at 9.4 GHz. The If amplifier, which occupies a significant size in a Heterodyne receiver for pulse radars, can be removed. Furthermore, by using detector logarithmic video amplifier in baseband, the receiver has a small size and it's characteristic shows a high dynamic range and sensitivity. From the results of measurements, the minimum receiver power of -70 dBm and selectivity of 55 dB are obtained.