Lianfu Liu

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In this paper, an approach of developing high agility and resolution millimeter-wave synthesizer architecture without using PLL (Phase Locked Loop) is proposed. Using the frequency multiplying of DDS output signal to provide the local oscillators instead of PLL in traditional three frequency conversions scheme, with good frequency configuration and optimal(More)
Co-Channel Dual Polarization (CCDP) technology is an efficient way to double the link capacity in modern communication system. However, the consequent polarization interferences become an inevitable problem to fight. Therefore, a Cross-Polarization Interference Canceller (XPIC) is necessary against the cross-talks. This paper focuses on the baseband XPIC(More)
This paper describes in detail how to select components of the peripheral circuits of LT3748. In this paper, the LT3748 is introduced to produce an 8V<sub>out</sub> at 3A from the nominal input voltage -48V with an operating input voltage range of -38.4V to -72V, where -48V is a common telecommunications equipment voltage. The test results show the output(More)
As the development of wireless communication, people put forward higher requirements on wireless transceiver system. MIMO technology is a major breakthrough in the field of wireless communication and it can greatly increase the channel capacity and spectrum efficiency without expanding bandwidth. This paper works on the design, development and test of a(More)
In this paper, a Ka band broadband bandpass filter with substrate integrated waveguide (SIW) technology is presented and investigated with simulation and experiment, which can provide 32.7% fractional bandwidth at the center frequency of 35GHz. In order to connect with microstrip circuits, an SIW to microstrip transition is included in this design.(More)
In the system of a communication, the control segment of the system is of great significant, it determines that whether the system can be work normally directly. The control system of a system can control the on-off of the power, the LO frequency of the system that controlled by code, and the switch, and the VGA that controlled by digit, all of what are the(More)
TDD is one of the duplex technologies used by the mobile communication system, and its role is to separate the receiving and transmitting channel (the uplink or downlink). This paper presents a high speed TDD baseband data processing system realized on the FPGA. Through the data transceiver loop method, it's verified that the transceiver switching rate of(More)
Nowadays, the 24GHz band is allowed temporarily for car radars by European Telecommunication Standards Institute (ETSI) until 2013, when the hardware technology (MMICs, antennas, etc.) will be mature enough to enable the development and production of automotive radar modules at the 76-81 GHz band. In this paper, a common structure of homodyne LFMCW (Liner(More)
This paper presents a wide-band receiver at 2.4GHz and 5GHz for 4&#x00D7;4 MIMO wireless communication system. This design is proposed and realized using super heterodyne architecture solution. Dual conversion structure is used in this receiver system. The receiver benefits from RF part, control part and phase shifter part. The carrier of this transceiver(More)