• Title/Summary/Keyword: Six-port direct conversion

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RF Front-end Design of Direct Conversion Receiver using Six-Port (6-단자를 이용한 직접 변환 수신 전 처리부 설계)

  • Jang Myoung-shin;Kim Young-wan;Ko Nam-young
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.7
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    • pp.1534-1540
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    • 2005
  • The direct conversion method is classified into the structure using the mixing technology and six-port scheme. In the view point of complexity and integration the direct conversion method using the six-port scheme is superior to that with mixing technology. Expecially, the six-port direct conversion technology provides the low power consumption and the broad-band characteristic. In this paper, the six-port direct conversion receiver with the branch-line coupler and the ring hybrid coupler is desisted respectively. The performances of the designed six-port schemes are analyzed and the six-port scheme with superior performance characteristics is proposed.

RF Front-end Design of Direct Conversion Receiver using Six-Port (6-단자를 이용한 직접 변환 수신 전 처리부 설계)

  • Jang, Myoung-Shin;Yang, Woo-Jin;Oh, Dae-Ho;Kim, Young-Wan;Ko, Nam-Young
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.2
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    • pp.481-484
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    • 2005
  • The direct conversion method is classified into the structure using the mixing technology and six-port scheme. In the view point of complexity and integration the direct conversion method using the six-port scheme is superior to that with mixing technology. Expecially, the six-port direct conversion technology provides the low power consumption and the broad-band characteristic. In this paper, the six-port direct conversion receiver with the branch-line coupler and the ring hybrid coupler is designed respectively. The performances of the designed six-port schemes are analyzed and the six-port scheme with superior performance characteristics is proposed.

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Design and Implementation of QPSK Receiver Using Six-Port Direct Conversion (Six-Port 직접 변환을 이용한 QPSK 수신기 설계 및 제작)

  • Yang, Woo-Jin;Kim, Young-Wan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.1 s.116
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    • pp.15-23
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    • 2007
  • A simple six-port direct conversion QPSK receiver which is made up of a six-port phase correlator, a signal power detector, and I/Q channel signal de-modulator is designed and implemented in this paper. The output phase signals of six-port phase correlator are also analysed. On the basis of $90^{\circ}C$ phase relation among the six-port phase correlator output signals, the QPSK de-modulation circuit is designed by a simple circuit. The six-port phase correlator is made up of $90^{\circ}$ hybrid branch line and power detector. The six-port phase correlator, which is designed in frequency range of 11.7 to 12.0 GHz, gets the phase error characteristics less than $5^{\circ}$. By considering matching network and amplitude balance in the designed fiequency range, the designed six-port direct conversion QPSK receiver demodulates the I and Q signals with performance less than $5^{\circ}$ phase error.

Design and implementation of power-controlled front-end module for direct conversion receiver (전력제어 직접변환수신 6단자 소자 설계 및 제작)

  • Kim, Young-Wan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.11
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    • pp.2391-2396
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    • 2010
  • The power-controlled six-port element that can control the local oscillator signal power and receiving RF signal power was designed and implemented in this paper. The direct conversion six-port element configuration was proposed, which provides the constant six-port output power by controlling the six-port input power with various signal strength. The direct conversion six-port element protects the power detector element of six-port receiver from the saturation status and compensates the transmission performance degradation. For implementation of power-controlled six-port element, the power-controlled six-port element including the power controller was analyzed. The implemented power-controlled six-port element shows the power control capability of 36 dB and gain imbalance of about 1.6 dB, phase imbalance of about $4^{\circ}$ in the frequency range of 1.69 GHz. The measured results show the good performance as direct conversion front-end element.

Design and Implementation of Broadband Power Detector for Six-port Direct Conversion Receiver (Six-port 직접 변환 수신을 위한 광대역 Power detector 설계 제작)

  • Lee, Yong-Ju;Kim, Yeong-Wan;Park, Dong-Cheol
    • Journal of Satellite, Information and Communications
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    • v.1 no.1
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    • pp.59-64
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    • 2006
  • The broadband power detector for power amplitude envelope detection of the direct-conversion Six-port output signal was designed and implemented in this paper. The power detector should be linearly operated to produce the linear amplitude and phase signal for input RF signals in required broadband frequency range. The power detector should be designed under conditions of matching circuit with low VSWR, which protect unbalanced phase signal from reflection signal due to mismatch between the output port of a six-port and the input port of a power detector. The designed power detectors, which were implemented in L-band with 50 ohm matching and Ku-band with multiple LC matching circuits and isolator, respectively, were analyzed in viewpoints of the utilization as a power detector of direct conversion Six-port. The dynamic range of designed power detectors were also measured and rvaluated as a power detector of Six-port circuit.

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Design of lumped six-port phase correlator and performance of lumped direct conversion receiver (집중 소자형 6단자 위상 상관기 설계와 집중 소자형 직접변환 수신 성능)

  • Yu, Jae-Du;Kim, Young-Wan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.5
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    • pp.1071-1077
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    • 2010
  • The six-port phase correlator using lumped elements was designed and fabricated in this paper, also the receiving performance of L-band direct conversion receiver using lumped six-port phase correlator element was analyzed. The proposed L-band lumped six-port phase correlator element was composed of a resistive power divider and the twist-wire coaxial cables. The proposed lumped six-port structure provides the small-sized configuration and wide-band characteristics. The performance of the L-band lumped direct conversion receiver structure was measured under the conditions of 1.69 GHz frequency for LO-CW signal and RF-QPSK signal, which are input signals for the lumped six-port phase correlator element. The direct conversion receiving structure using the proposed lumped six-port phase correlator element can recovered the good digital I/Q signal.

Performance Analysis of Improved Direct Conversion Six-port Phase Correlator (대역폭이 향상된 직접변환 Six-port 위상 상관기 성능분석)

  • Yu, Jae-Du;Kim, Young-Wan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2007.06a
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    • pp.91-94
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    • 2007
  • In this paper, the six-port phase correlator using $90^{\circ}$ hybrid branch-line coupler and three-arm branch $90^{\circ}$ hybrid coupler were designed. The performances for two six-port phase correlators were analyzed by using ADS2003A tool. Three-arm six-port phase collerator provides more wide dynamic frequency range than that of six-port using the conventional hybrid coupler in range of circa five times. Six-port phase correlators were fabricated to evaluate the performance of two six-port phase correlators. The measured performances for two six-port phase correlators show the good accordance with the simulation data.

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Design and fabrication of multi-band six-port phase correlator using metamaterial (메타물질 구조 다중대역 6단자 위상상관기 설계 및 제작)

  • Kim, Young-Wan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.12
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    • pp.2615-2621
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    • 2010
  • The multi-band six-port phase correlator using metamaterial was designed and fabricated in this paper. The lumped metamaterial structure that can process the dual-band receiving signal was analyzed. Based on the analyzed results, the small-sized metamatrial six-port phase correlator for multi-band direct conversion method was proposed and fabricated. Also, the resistive power divider and $90^{\circ}$ hybrid coupler that comprises the six-port phase correlator were implemented based on the scattering parameters of metamatrial six-port phase correlator. The measured results of the proposed six-port phase correlator show the good agreement with simulation results. The performance of the six-port phase correlator shows the reflection loss below -20 dB in the dual-band. Also, the proposed six-port phase correlator got a good transmission characteristic within 1 dB gain difference and ${\pm}4.1^{\circ}$ phase imbalance, respectively.

Performance of Dual Polarized MIMO System using Six-Port Receiver for Cognitive Radio

  • Lee Sang-Yub;Yang Wan-Cheol;Lee Jeong-Suk;Kim Hak-Sun
    • Broadcasting and Media Magazine
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    • v.11 no.1
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    • pp.78-85
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    • 2006
  • Cognitive radio is a paradigm for wireless communication in which either network of wireless node itself changes particular transmission or reception parameters to execute its tasks efficiently without interfering with the licensed users. This paper represents a performance of the cognitive radio technology on dual polarized MIMO system using six-port receiver. Six-port technology is well known direct conversion receiver. In this paper, a six-port phase discriminator based polarization signal separation is shown. That is, the SER(Symbol Error Rate) performance is improved using polarization separator and simple receiver architecture is proposed applying six-port receiver. The six-port technology has priority to adapt changeable frequency system and variable environments for cognitive radio. In general, dual polarized MIMO system has good capacity and quality using polarization separator [1].

Design and Performance Analysis of Wideband Six-port Phase correlator (대역폭이 향상된 Six-port 위상 상관기 설계 및 성능 분석)

  • Kim, Young-Wan;Yu, Jae-Du
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.3
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    • pp.414-419
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    • 2008
  • The six-port correlator is comprised of a power divider and three hybrid couplers. In this paper, the six-port phase correlator using three-arm branch $90^{\circ}$ hybrid coupler were designed with the center frequency of 11.85 GHz. The performances for the six-port phase correlator was analyzed by using ADS2003A tool. Three-arm six-port phase correlator provides more wide dynamic frequency range than that of six-port using the conventional hybrid coupler in range of circa five times, which is range of 10.8 to 12.3GHz (1.5 GHz). The phase errors among the output ports of the six-port phase correlator are below $5^{\circ}$. The six-port Phase correlator was fabricated to evaluate the Performance of the proposed six-port phase correlator. The measured performance of the six-port phase correlator shows the good accordance with the simulation data.