• Title, Summary, Keyword: GFSK

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Design and Fabrication of 400MHz ISM-Band GFSK Transceiver for Data Communication (400MHz ISM대역 데이터 통신용 GFSK 송.수신기 설계 및 제작)

  • Lee, Hang-Soo;Jang, Rae-Kyu;Hong, Sung-Yong;Lee, Seung-Min
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.401-406
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    • 2005
  • The GFSK Transceiver of 400MHz ISM band for data communication is designed and fabricated. To reduce the occupied bandwidth of transmitted signal, the GFSK modulation is selected. The measured results of fabricated transceiver show the data rate of 2400bps at 8.5kHz bandwidth, frequency deviation of less than $\pm$3kHz, sensitivity of -111dBm, SNR of 21.58dB. The fabricated transceiver is satisfied with the regulation of radio wave and has the good performance. This transceiver is well suited for data communication of 400MHz ISM band.

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Design and Fabrication of 400 MHz ISM-Band GFSK Transceiver for Data Communication (400 MHz ISM 대역 데이터 통신용 GFSK 송·수신기 설계 및 제작)

  • Lee Hang-Soo;Hong Sung-Yong;Lee Seung-Min
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.2
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    • pp.198-206
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    • 2006
  • The GFSK Transceiver of 400 MHz ISM band for data communication is designed and fabricated. To reduce the occupied bandwidth of transmitted signal, the GFSK modulation is selected. The measured results of fabricated transceiver show the data rate of 2,400 bps at 8.5 kHz bandwidth, frequency deviation of less than ${\pm}3\;kHz$, sensitivity of -107 dBm at SINAD of 20 dB, BER of less than $1.8{\times}10^{-3}$ at -110 dBm input power. The fabricated transceiver is satisfied with the regulation of radio wave and has the good performance.

Performance Evaluation of De/Modulations for ULP Communications for WPAN Systems (WPAN 시스템에서 초저전력 통신을 위한 변/복조 기술 성능 평가)

  • Kim, Yongok;Jang, Youngrok;Choi, Sooyong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.1
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    • pp.80-82
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    • 2016
  • In this letter, we evaluate the performances of both GOOK and GFSK de/modulation techniques which are candidates for ULP communications in WPAN systems. For the performance evaluation, we define the system model for each of GOOK and GFSK de/modulations and perform computer simulations based on the proposed models. From the computer simulations, we show that GOOK de/modulation technique has 15 dB out-of-band emission gain and is robust over frequency offsets in terms of BER compared to GFSK de/modulation technique.

Correlative Encoded Frequency Shift Keying (CEFSK) Modulation Technique

  • Lee, Kee-Hoon;Seo, Jong-Soo
    • Journal of Communications and Networks
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    • v.6 no.1
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    • pp.35-37
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    • 2004
  • A new power and bandwidth efficient modem technique-Correlative Encoded FSK (CEFSK) is proposed. CEFSK has a spectral efficiency comparable to Gaussian filtered FSK (GFSK), and it achieves 0.7db Eb/N0 improvement at bit error rate (BER) of 1 * 10 -4 over GFSK in an additive white Gaussian noise (AWGN) channel and 3.0dB improvement in a Rayleigh fading channel

Fractional Multi-bit Differential Detection Technique for Continuous Phase Modulation

  • Lee, Kee-Hoon;Seo, Jong-Soo
    • ETRI Journal
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    • v.26 no.6
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    • pp.635-640
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    • 2004
  • A new low-complexity differential detection technique, fractional multi-bit differential detection (FMDD), is proposed in order to improve the performance of continuous phase modulation (CPM) signals such as Gaussian minimum shift keying (GMSK) and Gaussian frequency shift keying (GFSK). In comparison to conventional one-bit differential detected (1DD) GFSK, the FMDD-employed GFSK provides a signal-to-noise ratio advantage of up to 1.8 dB in an AWGN channel. Thus, the bit-error rate performance of the proposed FMDD is brought close to that of an ideal coherent detection while avoiding the implementation complexity associated with the carrier recovery. In the adjacent channel interference environment, FMDD achieves an even larger SNR advantage compared to 1DD.

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Performance Analysis of Short Range High Speed Wireless Data Communication System (근거리 고속 무선 데이터 통신 시스템의 성능 해석)

  • Roh, Jae-Sung;Son, Sung-Chan
    • Journal of Digital Contents Society
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    • v.7 no.3
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    • pp.139-145
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    • 2006
  • Short-range wireless transmission and networking technologies are becoming increasingly important in enabling useful mobile applications. Bluetooth and IEEE 802.11b standards are the most commonly deployed technologies for WPAN and WLAN. This paper investigates the effect of short range wireless channel on the performance of MC-CDMA/BPSK system and Bluetooth GFSK signal transmission in AWGN and Rician fading environments. And we investigate performance degradation due to interference effects in short range wireless channel. We firstly derive a equation for the bit error probability in additive white Gaussian noise depending on MC-CDMA/BPSK signal and GFSK modulation signal parameters according to the Bluetooth RF standard. Then, from this error rate expression we calculate the mean error probability for MC-CDMA/BPSK signal and Bluetooth GFSK signal in Rician fading and interference channel. In particular, the impacts of the Rician fading depth and interference level on the error probability is shown in BER performance figures.

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Performance of CEFSK Systems in Nonlinear Channel Environments (비선형 채널 환경에서 CEFSK 시스템의 성능)

  • Lee, Kee-Hoon;Choi, Byeong-Woo;Shin, Kwan-Ho;Seo, Jong-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.1
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    • pp.79-87
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    • 2013
  • A new modulation technique - correlative encoded FSK (CEFSK) - for use in power and bandwidth limited digital communication system is proposed. CEFSK is free of ISI and generates output signals which have a smooth and continuous phase transition and a reduced envelope fluctuation by keeping correlation between amplitude and phases of two subsequent symbols. In comparison to conventional one-bit differential detected (1DD) GFSK, the performance of the 1DD-CEFSK in a non-linearly amplified (NLA) channel impaired by additive white Gaussian noise (AWGN), ISI and IM, is analyzed via computer simulation. The simulation result shows that, in an NLA single-channel, 1DD-CEFSK provides a signal-to-noise ratio (SNR) advantage of up to 1.2dB and 0.8dB at BER of $1{\times}10^{-4}$ when input back-off (IBO) of HPA is -1.0dB and -3.0dB, respectively. For the same channel environment with multi-channel, 1DD-CEFSK outperforms 1DD-GFSK by 1.1dB in SNR, regardless of the value of IBO.

Performance Analysis of GFSK Systems by Impulsive Electromagnetic Noise in Indoor Radio Fading Channel Environment (실내 무선 페이딩 채널 환경에서 임펄스성 전자간섭파에 의한 GFSK시스템의 성능 분석)

  • 이양선;김지웅;강희조
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.7
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    • pp.1115-1121
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    • 2001
  • In this paper, we analyzed the performance of GFSK system that presence fading effect in indoor radio communication environments and impulsive electromagnetic noise from electronic equipments then we applied the Truncated Type- II Hybrid ARQ scheme to make satisfied in data transmission service. As a result, the system was influenced by fading and impulsive electromagnetic noise. Especially, the system was much degraded by high occurrence frequency and amplitude of impulsive electromagnetic noise than fading which has direct frequency. By adopting the Truncated Type-II hybrid ARQ technique we can also obtained the performance improvement in the low signal power(20 dB) arid over 24 dB in strong impulsive electromagnetic noise environment which is occurred error floor and terribly influenced by the system.

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Performance Comparison of Wireless Home Networking Systems (무선 홈네트워킹 시스템의 성능 비교)

  • 김동호;우병훈;강희조
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.745-748
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    • 2001
  • 본 논문에서는 무선 홈네트워킹 시스템으로 대두되고 있는 Wireless LAN(802.11b), HomeRF, Bluetooth 성능을 간섭이 고려되지 않는 경우의 실내 무선 환경하에서 시스템의 변조 방식만을 비교 분석하였다. 무선 홈네트워킹 시스템의 채널 수 및 주파수 대역은 동일하며 실내 무선 환경을 라이시안 페이딩 환경으로 고려하였을 경우, 직접파 대 반사파 전력비(K)가 6[dB]인 라이시안 페이딩 환경하에서 오율 $10^{-3}$을 기준으로 비교하여 보면, DPSK 방식이 4FSK와 GFSK 보다 4[dB], DQPSK와는 11[dB] 그리고 2FSK 보다 28[dB] 정도 우수하였다. 또한 GFSK와 4FSK가 0.4[dB] 차이를 두고 일정하게 분포함을 알 수 있었다.

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A Dual-Mode 2.4-GHz CMOS Transceiver for High-Rate Bluetooth Systems

  • Hyun, Seok-Bong;Tak, Geum-Young;Kim, Sun-Hee;Kim, Byung-Jo;Ko, Jin-Ho;Park, Seong-Su
    • ETRI Journal
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    • v.26 no.3
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    • pp.229-240
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    • 2004
  • This paper reports on our development of a dual-mode transceiver for a CMOS high-rate Bluetooth system-onchip solution. The transceiver includes most of the radio building blocks such as an active complex filter, a Gaussian frequency shift keying (GFSK) demodulator, a variable gain amplifier (VGA), a dc offset cancellation circuit, a quadrature local oscillator (LO) generator, and an RF front-end. It is designed for both the normal-rate Bluetooth with an instantaneous bit rate of 1 Mb/s and the high-rate Bluetooth of up to 12 Mb/s. The receiver employs a dualconversion combined with a baseband dual-path architecture for resolving many problems such as flicker noise, dc offset, and power consumption of the dual-mode system. The transceiver requires none of the external image-rejection and intermediate frequency (IF) channel filters by using an LO of 1.6 GHz and the fifth order onchip filters. The chip is fabricated on a $6.5-mm^{2}$ die using a standard $0.25-{\mu}m$ CMOS technology. Experimental results show an in-band image-rejection ratio of 40 dB, an IIP3 of -5 dBm, and a sensitivity of -77 dBm for the Bluetooth mode when the losses from the external components are compensated. It consumes 42 mA in receive ${\pi}/4-diffrential$ quadrature phase-shift keying $({\pi}/4-DQPSK)$ mode of 8 Mb/s, 35 mA in receive GFSK mode of 1 Mb/s, and 32 mA in transmit mode from a 2.5-V supply. These results indicate that the architecture and circuits are adaptable to the implementation of a low-cost, multi-mode, high-speed wireless personal area network.

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