Low-rate spread spectrum communication transmission base band system
A baseband system and spread spectrum communication technology, which is applied in baseband system components, transmission systems, digital transmission systems, etc., can solve the problems of spread spectrum chip spread spectrum code rate and spread spectrum code length limitation, error correction and error detection, etc. , to achieve the effect of short design cycle, flexible use and fast operation speed
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[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0051] Such as figure 1 In the functional block diagram of the present invention shown, except signal modulation and D / A conversion, other functions are all realized in FPGA. The central control module controls the work of each functional module in the FPGA. The spread spectrum method adopts the direct sequence spread spectrum method, and the information rate, code rate, code length and modulation method are all controlled by the program, which can be applied to the direct sequence spread spectrum communication system with low rate (serial port communication rate up to 20Kbps).
[0052] The method of realization of the present invention is as follows:
[0053] The conversion between the TTL level and the positive and negative voltage specified by the RS-232 standard is completed through the serial port level conversion chip, so that the baseband system can ...
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