Millimeter wave modem

A modem and millimeter wave technology, which is applied in the modulation carrier system, digital transmission system, electrical components, etc., can solve the problems of demodulation and inability to use millimeter wave 155Mbps signals, and achieve the effect of high frequency spectrum utilization

Active Publication Date: 2009-01-07
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current QAM demodulation chip is mostly designed for DVB, and the symbol rate is mostly limited to below 10Mbps, so it cannot be used for millimeter wave 155Mbps signal demodulation

Method used

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  • Millimeter wave modem
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Examples

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Embodiment Construction

[0019] refer to Figure 1 to Figure 3 , the present invention consists of a down-conversion unit 1, an intermediate frequency AGC2, a millimeter-wave demodulator 3, an auxiliary multiple tap unit 4, a millimeter-wave modulator 5, an I / Q up-conversion unit 6, a bandpass filter 7, and a local oscillator module 8 , 80 components of power supply. figure 1 It is an electric principle block diagram of the present invention, and the embodiment is according to figure 1 Connect the lines.

[0020] The function of the down-conversion unit 1 in the present invention is to mix the intermediate frequency signal input from the port E with the reference signal provided by the local oscillator module 8, and generate a second intermediate frequency signal after filtering. The down-conversion unit 1 of the embodiment is made by the HMC207 chip of Hittite Company of the United States.

[0021] The intermediate frequency AGC2 in the present invention performs automatic gain control on the inpu...

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PUM

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Abstract

The invention discloses a millimeter wave modem which relates to a modem device which can be used in an SDH interface with millimeter wave frequency band in the communication field. The millimeter wave modem is composed of a millimeter wave modulator, a millimeter wave demodulator, an auxiliary multiplexer / demultiplexer, analog and digital AGCs, a high-speed ADC, a DAC, upper and lower frequency converters, a local oscillator module, a power supply and other parts. The millimeter wave modem supports 64QAM / 16QAM / QPSK, the symbol rate is 90Msps; the millimeter wave modem adopts the combined design of carrier recovery-equalizer, and the equalizer is 84-order; the millimeter wave modem adopts the pre-filtering timing recovery algorithm, and the jitter is very small; two levels of the analog and the digital AGCs are independent and can both receive the level dynamic range and the control precision. The millimeter wave modem is characterized by strong anti-inter-symbol interference ability, high power utilization rate and large signal input dynamic range. The millimeter wave modem is especially applicable to being taken as the large-capacity modem of the SDH interface with the millimeter wave band and the information rate of 3 multiplied by 155Mbps or 2 multiplied by 155Mbps or 1 multiplied by 155Mbps.

Description

technical field [0001] The invention relates to a millimeter-wave modem in the communication field, and is particularly suitable for use as a modem device with a millimeter-wave frequency band, an information rate of 3×155Mbps, or 2×155Mbps, or 1×155Mbps, and an SDH interface. Background technique [0002] The bandwidth resources of the millimeter wave frequency band are very rich, which is suitable for realizing large-capacity wireless communication; however, the rain attenuation and dust attenuation in this frequency band are very serious, and the power of the transmitter is relatively small. Therefore, to ensure a certain communication distance, it is necessary to consider a modulation method with a low demodulation threshold such as QPSK. At this time, the demodulator needs to support a symbol rate up to 100M. But the current QAM demodulation chip is mostly designed for DVB, and the symbol rate is mostly limited to below 10Mbps, so it cannot be used for millimeter wave 1...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04B1/00
Inventor 李志勇张永杰王晓明王东张琳
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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