In this paper,a novel UWB communication system structure is proposed.The transmitted signal uses OOK modulation and chirp spread spectrum.The received signal first goes through a dechirp pulse compression process,and ...In this paper,a novel UWB communication system structure is proposed.The transmitted signal uses OOK modulation and chirp spread spectrum.The received signal first goes through a dechirp pulse compression process,and then is processed with a two-level sliding correlation algorithm for coarse timing synchronization and fine timing synchronization.After the SNR estimation,the signal is demodulated by an energy detection method.An integrated system level simulation model is established,and the performance of this system is evaluated over the AWGN channel,IEEE 802.15.3a CM1 and CM4 channels.The theoretical analysis and simulation results show that this UWB communication system can effectively reduce the sampling rate and signal processing speed at the receiver,and it is more suitable for long-distance and low-rate UWB communications with high spreading gain.展开更多
A 2.4 GHz high efficiency radio frequency （RF） transmitter for wireless body area network （WBAN） in medical applications is presented in this paper. The transmitter architecture with high energy efficiency is prop...A 2.4 GHz high efficiency radio frequency （RF） transmitter for wireless body area network （WBAN） in medical applications is presented in this paper. The transmitter architecture with high energy efficiency is proposed to achieve a high data rate with low power consumption. In conventional transmitters, the oscillator and power amplifier are turned off when the transmitter sends 0. The required time for turning oscillator ON/OFF is longer than the other blocks of the transmitter. In the proposed transmitter, the low power oscillator is on all the time while the power amplifier and modulator are turned off when＂0＂data is sent. The transmitter consumes 3.2 mW at 0.5 dBm output by 285 Mbps data rate and the energy consumption per transmitted bit with 0.5 dBm output power is 10 pJ/（bit-mW）. The proposed transmitter was designed in 0.18 μm CMOS technology.展开更多
In this paper, the performance evaluation of Frequency Modulated Chaotic On-Off Keying (FM-COOK) in AWGN, Rayleigh and Rician fading channels is given. The simulation results show that an improvement in BER can be gai...In this paper, the performance evaluation of Frequency Modulated Chaotic On-Off Keying (FM-COOK) in AWGN, Rayleigh and Rician fading channels is given. The simulation results show that an improvement in BER can be gained by incorporating the FM modulation with COOK for SNR values less than 10dB in AWGN case and less than 6dB for Rayleigh and Rician fading channels.展开更多
The insertion loss （IL） of a T-type attenuator is theoretically analyzed. A T-type RF （ radio frequency） CMOS （ complementary metal-oxide-semiconductor ） attenuator is designed as an on-off keying（OOK） modulat...The insertion loss （IL） of a T-type attenuator is theoretically analyzed. A T-type RF （ radio frequency） CMOS （ complementary metal-oxide-semiconductor ） attenuator is designed as an on-off keying（OOK） modulator in a time-hopping ultra wide-band （TH-UWB）communication with a carrier frequency of 4 GHz. In the topology of the OOK modulator circuit, there are three parts, an oscillator with an oscillating frequency of 4 GHz, a T-type attenuator constructed by RF CMOS transistors, and an output impedance matching network with a L-type LC structure. The modulator is controlled by a time-hopping pulse position modulation（TH-PPM） signal. The envelope of the modulated signal varies with the amplitude of the controlling signal. Meanwhile, an output matching network is also designed to match a 50 Ω load. In 0. 18 μm RF CMOS technology, a modulator is designed and simulated. The implemented modulator chip has 65 mV of the output amplitude at a 50 fl load from a 1.8 V supply, and the return loss （ S11 ） at the output port is less than - 10 dB. The chip size is 0. 7 mm × 0. 8 mm, and the power consumption is 12. 3 mW.展开更多
This paper proposes low-power high-efficiency multi-gigabit 60 GHz transceiver systems for short-range communications. 60 GHz muhi-gigabit on-off keying （OOK） receiver system-in-package （SIP） module is developed u...This paper proposes low-power high-efficiency multi-gigabit 60 GHz transceiver systems for short-range communications. 60 GHz muhi-gigabit on-off keying （OOK） receiver system-in-package （SIP） module is developed using a low temperature co-fired ceramic （LTCC） technology. Integrated with a low-power complementary metal oxide semiconductor （CMOS） OOK demodulator, the LTCC receiver module demonstrates Full-HD uncompressed video streaming at a distance of 1 m. A low-power and high-efficiency fully integrated OOK transceiver is also developed to be integrated in a handheld device. The transceiver consumes 67 mW at 10.7 Gb/ s and occupies an active footprint of 0.44 mm^2. With an on-board Yagi-Uda antenna, the transceiver achieves 10.7 Gb/s of data transmission, resulting in a high energy efficiency of 6.26 pJ/bit. The antenna-in-package module with the transceiver demon- strates mobile-to-display 1080p Full-HD video transmission over a distance of 60 cm.展开更多
基金Supported by the National High Technology Research and Development Program of China(No.2009 AA011202,2009AA011205)the National Science and Technology Major Project of China(No.2009ZX03006-007)
文摘In this paper,a novel UWB communication system structure is proposed.The transmitted signal uses OOK modulation and chirp spread spectrum.The received signal first goes through a dechirp pulse compression process,and then is processed with a two-level sliding correlation algorithm for coarse timing synchronization and fine timing synchronization.After the SNR estimation,the signal is demodulated by an energy detection method.An integrated system level simulation model is established,and the performance of this system is evaluated over the AWGN channel,IEEE 802.15.3a CM1 and CM4 channels.The theoretical analysis and simulation results show that this UWB communication system can effectively reduce the sampling rate and signal processing speed at the receiver,and it is more suitable for long-distance and low-rate UWB communications with high spreading gain.
文摘A 2.4 GHz high efficiency radio frequency （RF） transmitter for wireless body area network （WBAN） in medical applications is presented in this paper. The transmitter architecture with high energy efficiency is proposed to achieve a high data rate with low power consumption. In conventional transmitters, the oscillator and power amplifier are turned off when the transmitter sends 0. The required time for turning oscillator ON/OFF is longer than the other blocks of the transmitter. In the proposed transmitter, the low power oscillator is on all the time while the power amplifier and modulator are turned off when＂0＂data is sent. The transmitter consumes 3.2 mW at 0.5 dBm output by 285 Mbps data rate and the energy consumption per transmitted bit with 0.5 dBm output power is 10 pJ/（bit-mW）. The proposed transmitter was designed in 0.18 μm CMOS technology.
文摘In this paper, the performance evaluation of Frequency Modulated Chaotic On-Off Keying (FM-COOK) in AWGN, Rayleigh and Rician fading channels is given. The simulation results show that an improvement in BER can be gained by incorporating the FM modulation with COOK for SNR values less than 10dB in AWGN case and less than 6dB for Rayleigh and Rician fading channels.
文摘The insertion loss （IL） of a T-type attenuator is theoretically analyzed. A T-type RF （ radio frequency） CMOS （ complementary metal-oxide-semiconductor ） attenuator is designed as an on-off keying（OOK） modulator in a time-hopping ultra wide-band （TH-UWB）communication with a carrier frequency of 4 GHz. In the topology of the OOK modulator circuit, there are three parts, an oscillator with an oscillating frequency of 4 GHz, a T-type attenuator constructed by RF CMOS transistors, and an output impedance matching network with a L-type LC structure. The modulator is controlled by a time-hopping pulse position modulation（TH-PPM） signal. The envelope of the modulated signal varies with the amplitude of the controlling signal. Meanwhile, an output matching network is also designed to match a 50 Ω load. In 0. 18 μm RF CMOS technology, a modulator is designed and simulated. The implemented modulator chip has 65 mV of the output amplitude at a 50 fl load from a 1.8 V supply, and the return loss （ S11 ） at the output port is less than - 10 dB. The chip size is 0. 7 mm × 0. 8 mm, and the power consumption is 12. 3 mW.
文摘This paper proposes low-power high-efficiency multi-gigabit 60 GHz transceiver systems for short-range communications. 60 GHz muhi-gigabit on-off keying （OOK） receiver system-in-package （SIP） module is developed using a low temperature co-fired ceramic （LTCC） technology. Integrated with a low-power complementary metal oxide semiconductor （CMOS） OOK demodulator, the LTCC receiver module demonstrates Full-HD uncompressed video streaming at a distance of 1 m. A low-power and high-efficiency fully integrated OOK transceiver is also developed to be integrated in a handheld device. The transceiver consumes 67 mW at 10.7 Gb/ s and occupies an active footprint of 0.44 mm^2. With an on-board Yagi-Uda antenna, the transceiver achieves 10.7 Gb/s of data transmission, resulting in a high energy efficiency of 6.26 pJ/bit. The antenna-in-package module with the transceiver demon- strates mobile-to-display 1080p Full-HD video transmission over a distance of 60 cm.
