Wireless terminal transceiver of 60GHz RoF (Radio over Fiber) access system

A wireless terminal and access system technology, applied in the field of wireless terminal transceivers, can solve the problems of IQ quadrature mismatch, local oscillator leakage, etc.

Active Publication Date: 2012-09-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a wireless terminal transceiver solution for a 60GHz RoF access system to solve the problems of local oscillator leakage and IQ quadrature mismatch existing in the prior art

Method used

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  • Wireless terminal transceiver of 60GHz RoF (Radio over Fiber) access system
  • Wireless terminal transceiver of 60GHz RoF (Radio over Fiber) access system
  • Wireless terminal transceiver of 60GHz RoF (Radio over Fiber) access system

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Embodiment

[0054] In order to set forth the present invention conveniently, some technical terms are described below:

[0055] RoF (Radio over Fiber): Radio over Fiber

[0056] CS (Central Station): central station

[0057] B S (Base Station): base station

[0058] FTTx (Fiber-to-the-x): Fiber access

[0059] LNA (Low Noise Amplifier): Low Noise Amplifier

[0060] BPF (band-pass filter): band-pass filter

[0061] LO (Local Oscillator): local oscillation

[0062] VGA (Variable Gain Amplifier): variable gain amplifier

[0063] ADC (Analog to Digital Converter): Analog to Digital Converter

[0064] DAC (Digital to Analog Converter): Digital to Analog Converter

[0065] QPSK (Quadrature Phase Shift Keying): Quadrature Phase Shift Keying

[0066] PA (power amplifier): power amplifier

[0067] FPGA (Field Programmable Gate Array): Field Programmable Gate Array

[0068] DSP (Digital Signal Processing): digital signal processing

[0069] ASIC (Application Specific Integrated Circuit):...

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Abstract

The invention discloses a wireless terminal transceiver of a 60GHz RoF (Radio over Fiber) access system. Secondary subharmonic frequency mixing is adopted, and the frequency of a needed local oscillation signal is reduced in a frequency multiplication frequency mixing way, so that the problem of leakage of the local oscillation signal to an antenna, i.e., a radiofrequency transmitting end in the conventional wireless terminal transceiver scheme is solved, and the circuit modulation performance is improved. Meanwhile, a downlink medium frequency analog signal obtained after secondary subharmonic down-conversion is subjected to downlink medium frequency digital signal processing after ADC (Analog to Digital Conversion) to obtain a needed downlink digital baseband signal; and an uplink digital baseband signal is subjected to uplink medium frequency digital signal processing to obtain an uplink medium frequency digital signal. A series of medium frequency digital signal processing such as odd-even extraction or interpolation, symbol modulation, delay filtering, demodulation or modulation and the like is performed in a digital domain, so that the problem of IQ orthogonal mismatch caused by 90-degree phase change on a local oscillation signal for obtaining two paths of analog signals in an analog frequency domain of the conventional receiver is solved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and more specifically relates to a wireless terminal transceiver for a radio over fiber (RoF, Radio over Fiber) access system, including down-conversion of 60GHz signals, demodulation and processing of signals , and the modulation and up-conversion process of the baseband signal. Background technique [0002] The continuous advancement of the informatization of human society has put forward higher requirements for communication capacity and bandwidth. Fiber access has the advantages of high bandwidth, long-distance transmission, and low loss, and fiber access can achieve high-speed access above Gbps, but it is easily restricted by geographical factors and cannot realize free movement of terminal equipment. Wireless access has the characteristics of flexible and convenient access, but its available bandwidth in low-frequency bands is small, and it is difficult to meet the high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/155H04B10/158H04L25/03H04L25/06H04B10/2575H04B10/40
Inventor 张崇富王莹邱昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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