Time orthogonal frequency division multiplexing modem

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...

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.

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