Orthogonal linearly-polarized digital modulator

Abstract

The invention relates to an orthogonal linearly-polarized digital modulator comprising an orthogonal linearly-polarized antenna module, a radio frequency switch module, a local oscillator module, and a baseband signal generation module. The local oscillator module generates continuous dot frequency signals and outputs the signals to the radio frequency switch module; the baseband signal generation module generates a binary baseband signal used as a control signal of the radio frequency switch module; and the radio frequency switch module outputs radio frequency signals from two different ports based on different code elements. Two output ports of the radio frequency switch modules are connected with two input ports of the orthogonal linearly-polarized antenna respectively; and radio frequency signals inputted from different ports generates a horizontally polarized electromagnetic wave and vertically polarized respectively. According to the orthogonal linearly-polarized digital modulator, different electromagnetic wave polarization characteristics represent different baseband signal code elements; and the modulator has advantages of less spectrum resource occupation and simple realization. The provided modulator can be applied to the wireless communication field with various line-of-sight propagation.

Description

technical field [0001] The invention relates to the field of line-of-sight wireless communication, in particular to a digital modulator in a line-of-sight wireless communication transmitter. technical background [0002] In the field of wireless communication, digital modulation technology is widely used. The binary baseband signal is a sequence composed of "0" and "1". Usually, the symbol "0" corresponds to a low level, and the symbol "1" corresponds to a high level. In the existing digital modulation methods, using the amplitude, phase and frequency characteristics of the sine wave, three basic modulation methods can be used: amplitude keying, phase keying and frequency keying. No matter which modulation method is used, the modulated signal has a certain bandwidth. Moreover, as the baseband rate increases, the modulated signal occupies a wider bandwidth. In this way, with the increase of the number of users and the increase of transmission information, spectrum resource...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the existing digital modulation method uses the signal amplitude, phase, and frequency characteristics to carry information to complete the modulation, and the modulated signal generated needs to occupy more spectrum resources, and the implementation is relatively complicated

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