CN113644987A

CN113644987A - Communication signal generator

Info

Publication number: CN113644987A
Application number: CN202110817782.8A
Authority: CN
Inventors: 江金龙; 郭书超; 叶坤水; 刘雨星; 熊志微
Original assignee: Jiujiang University
Current assignee: Jiujiang University
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2021-11-12

Abstract

The utility model provides a communication signal generator, includes the CPU module of being connected with baseband input module, be connected with power reset and clock module, keyboard input module, LCD display screen in the CPU module, the CPU module passes through the IO port and is connected with digital baseband transform output module, band-pass modulation output module respectively, the CPU module passes through the SPI mouth and is connected with DA conversion module, still be equipped with serial communication module in the CPU module. The invention can generate baseband signals in various forms, such as unipolar, bipolar and other non-square wave baseband signals, and can also generate passband modulation signals such as 2ASK, 2FSK and 2PSK, and other related signals such as Chirp; the keyboard inputs and sets relevant parameters and working states, and the LCD displays the relevant parameters and the working states; the serial port communication module can be communicated with an upper computer, and parameters and working states of the generator are set through the upper computer.

Description

Communication signal generator

Technical Field

The invention relates to a communication signal generator, in particular to a TMS320F28 series DSP-excited communication signal generator.

Background

In the field of communication testing, it is often necessary to generate a specific communication waveform for transmission in a communication system to obtain relevant transmission performance, which is convenient for analysis and debugging. The communication teaching design is similar, and the circuit of the communication signal generator is simple to realize, economical and practical and convenient to manufacture. The prior communication signal generator has complex peripheral circuits and can not generate common communication baseband signals, binary modulation signals and related auxiliary signals.

Disclosure of Invention

The present invention is directed to a communication signal generator, which greatly simplifies the design of peripheral circuits and can generate commonly used communication baseband signals, binary modulation signals and related auxiliary signals.

The technical scheme that takes for realizing above-mentioned purpose is, a communication signal generator, includes the CPU module of being connected with baseband input module, be connected with power reset and clock module, keyboard input module, LCD display screen on the CPU module, the CPU module passes through the IO port and is connected with digital baseband transform output module, band-pass modulation output module respectively, the CPU module passes through the SPI mouth and is connected with digital baseband non-square wave output module, still be equipped with serial communication module on the CPU module.

Further, the CPU module is a TMS320F28 series DSP chip.

Further, the digital baseband conversion output module comprises a MAX3232 chip, the IO port outputs unipolar digital waveforms, and the unipolar digital waveforms are converted by the MAX3232 chip and can output bipolar digital waveforms.

Further, the band-pass modulation output module comprises an AD9852 chip, and the AD9852 chip outputs 2ASK, 2FSK, 2PSK modulation signals, single-frequency sine wave signals and Chirp auxiliary signals.

Further, the DA conversion module includes a TLC5615 chip, and the DA conversion module outputs a baseband non-square waveform, generating a specific baseband waveform.

Further, the serial port communication module directly communicates with an asynchronous serial port upper computer, or the serial port communication module is externally connected with a serial port-to-USB module, so that the serial port communication module can conveniently communicate with the upper computer with a USB interface.

Advantageous effects

Compared with the prior art, the invention has the following advantages.

The invention greatly simplifies the design of the peripheral circuit, and can generate baseband signals in various forms, such as unipolar, bipolar and other non-square-wave baseband signals, as well as passband modulation signals such as 2ASK, 2FSK and 2PSK, and other related signals such as Chirp; the keyboard inputs and sets relevant parameters and working states, and the LCD displays the relevant parameters and the working states; the serial port communication module can be communicated with an upper computer, and parameters and working states of the generator are set through the upper computer.

Drawings

Fig. 1 is a system block diagram of the present communication signal generator;

fig. 2 is a block diagram of a hardware implementation of the present communication signal generator;

fig. 3 is a flow chart of a main program of the communication signal generator.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The utility model provides a communication signal generator, includes the CPU module 2 of being connected with baseband input module 1, as shown in fig. 1-3, CPU module 2 is last to be connected with power reset and clock module 3, keyboard input module 4, LCD display screen 5, CPU module 2 is connected with digital baseband transform output module 6, band-pass modulation output module 8 respectively through IO port 21, CPU module 2 is connected with DA conversion module 7 through SPI port 22, still be equipped with serial communication module 23 on the CPU module 2.

The CPU module 2 is a TMS320F28 series DSP chip.

The digital baseband conversion output module 6 comprises a MAX3232 chip, the IO port 21 outputs unipolar digital waveforms, and the unipolar digital waveforms are converted by the MAX3232 chip and can output bipolar digital waveforms.

The band-pass modulation output module 8 comprises an AD9852 chip, and the AD9852 chip outputs 2ASK, 2FSK, 2PSK modulation signals, single-frequency sine wave signals and Chirp auxiliary signals.

The DA conversion module 7 includes a TLC5615 chip, and the DA conversion module 7 outputs a baseband non-square waveform to generate a specific baseband waveform.

The serial port communication module 23 is directly communicated with an asynchronous serial port upper computer, or the serial port communication module is externally connected with a serial port-to-USB module, so that the serial port communication module is conveniently communicated with the upper computer with a USB interface.

In the invention, the CPU module 2 is a TMS320F28 series DSP chip, the main frequency can reach 150MHz, the DA chip can be conveniently expanded through the SPI 22, at most 64I/O ports can be reached, and the digital quantity input and output and the control of the AD9852 chip are convenient. The IO port 21 can conveniently receive a digital baseband signal and output a digital baseband conversion signal, and the bipolar baseband signal can be output after conversion by an MAX3232 chip; the DA output is extended through an SPI port, and the DA module outputs a non-square-wave baseband signal by using an SPI interface module such as a TLC5615 chip. The AD9852 chip can output 2ASK, 2FSK and 2PSK modulation signals and related signals such as Chirp and single-frequency sine waves. The keyboard input module, the LCD display screen and the serial port communication module are convenient for parameter setting and function control.

The digital baseband signal in the invention can be input from the outside through an IO port, can also be generated by DSP operation, can output baseband waveform conversion signals in various forms, the passband modulation adopts an AD9852 chip, the parameter input and the working state can be set through the IO port of the DSP, and can output 2ASK, 2FSK, 2PSK and other related signals.

Claims

1. The utility model provides a communication signal generator, includes CPU module (2) of being connected with baseband input module (1), its characterized in that, be connected with power reset and clock module (3), keyboard input module (4), LCD display screen (5) on CPU module (2), CPU module (2) are connected with digital baseband conversion output module (6), band-pass modulation output module (8) respectively through IO port (21), CPU module (2) are connected with DA conversion module (7) through SPI port (22), still be equipped with serial communication module (23) on CPU module (2).

2. A communication signal generator according to claim 1, characterized in that the CPU block (2) is a TMS320F28 series DSP chip.

3. The communication signal generator according to claim 1, wherein the digital baseband conversion output module (6) comprises a MAX3232 chip, and the IO port (21) outputs a unipolar digital waveform, and is converted by the MAX3232 chip to output a bipolar digital waveform.

4. A communication signal generator according to claim 1, characterized in that the band-pass modulation output module (8) comprises an AD9852 chip, said AD9852 chip outputting 2ASK, 2FSK, 2PSK modulated signals and single-frequency sine wave signals, Chirp auxiliary signals.

5. A communication signal generator according to claim 1, characterized in that the DA conversion module (7) comprises a TLC5615 chip, and that the DA conversion module (7) outputs a baseband non-square waveform, resulting in a specific baseband waveform.

6. The communication signal generator according to claim 1, wherein the serial communication module (23) is directly communicated with an asynchronous serial port upper computer, or the serial communication module is externally connected with a serial-to-USB module to facilitate communication with an upper computer of a USB interface.