Time orthogonal frequency division multiplexing modem

A modem and orthogonal frequency division technology, applied in the field of communication, can solve the problems of poor anti-frequency deviation, large peak-to-average power ratio, etc., and achieve the effects of stable and reliable performance, reduced peak-to-average power ratio, and reduced cost

Active Publication Date: 2008-10-29
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention not only has the same anti-intersymbol interference performance as the traditional OFDM technology, but also has the ability to collect multipath, and overcomes the problems of high peak-to-average power ratio and poor anti-frequency offset ability, and also has high integration and small volume. , light weight, good maneuverability, etc.

Method used

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  • Time orthogonal frequency division multiplexing modem
  • Time orthogonal frequency division multiplexing modem
  • Time orthogonal frequency division multiplexing modem

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Embodiment Construction

[0016] refer to Figure 1 to Figure 3 , the present invention consists of auxiliary multiplexer 1, low-IF modulator 2, demodulator 3, IF amplifier 4, D / A converter 5-1 to 5-2, low-pass filter 6-1 to 6- 2. Local oscillator modules 7-1 to 7-2, mixers 8-1 to 8-2, adder 9, bandpass filter 10, and power supply 29. figure 1 It is an electric principle block diagram of the present invention, and the embodiment is according to figure 1 Connect the lines. Among them, the function of auxiliary multiplexer / demultiplexer 1 is to input symbol clock through port B, and input external information code stream through input port A, and perform frame processing, and pass the frame-based information code stream and symbol clock through output ports 3 and 4 Provide to the low-IF modulator 2; receive the composite code stream demodulated by the demodulator 3 and the symbol clock, perform deframing processing, separate the service information and output it to the external signal code port C, and ...

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Abstract

The invention discloses a multiplexing modem of time orthogonal frequency-division, which relates to a modem device with restricted transmitting power, strong anti-frequency offset capability and the performance of resisting inter-symbol interference in the field of communication. The multiplexing modem of the invention comprises components such as a low-medium frequency modulator, a demodulator, an auxiliary multiplexer/demultiplexer, an intermediate frequency amplifier, a D/A converter, a low pass filter, a self-vibration module, a mixer, an adder, a band-pass filter and a power supply, etc.; by adopting TOFDM signals with quasi-constant envelop transmission, the modem of the invention realizes the performance of resisting the inter-symbol interference which is the same as that of the traditional OFDM technology, has the capability of collecting multipath, overcomes the problems of large peak-to-average power ratio and the bad capability of resisting frequency offset, and also realizes the purpose of the multiplexing modem of the time orthogonal frequency-division. The modem of the invention also has the advantages of high integration degree, small volume, light weight and good flexibility, etc. and is especially suitable for the field requiring for the modem with large-capacity wireless data transmission performance among strong multipath high-speed moving targets with seriously restricted power.

Description

technical field [0001] The invention relates to a time-orthogonal-frequency-division multiplexing (abbreviated as TOFDM) modem in the communication field, and is particularly suitable for a modem device for large-capacity wireless data transmission between strong multipath and high-speed moving targets with severely limited power. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology can effectively suppress the transmission damage caused by strong multipath under certain conditions. Anti-intersymbol interference, anti-fading, and high frequency band utilization are the outstanding advantages of OFDM technology. But this technology has two outstanding defects: the peak-to-average power ratio of the transmitter is very large (≥7) and the ability to resist frequency deviation is poor. In the wireless communication between the ground-air and air-air large-capacity omnidirectional antennas, due to the limited transmission power, and the serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 李文铎王斌秦建存高自新刘莹郝清涛陈强辉刘丽哲韩明钥
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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