I have never played this kind of competition before, and it has been a month since I received the notice, and I have never done this software radio before. Joining the competition group, basically most of them are juniors, juniors and seniors in communication engineering, and I just A rookie photoelectric student, trembling online. I brought in two unreliable teammates (basically just verbal support, in the end, it was basically done by me leading the lower grades), pure and tired. But the junior and junior girls are still very powerful, as well as the big cow teacher Li. The last three groups were finally completed. Flowers, flowers. Here is a little publicity.
Topics first:
2022 Hangzhou Electronic Technology Competition software radio competition topic
1. Simple Spectrum Analyzer Design
The spectrum analyzer is an instrument for studying the spectrum structure of electrical signals. A simple spectrum analyzer is implemented on the PLUTO software radio platform. Support spectrum display, spectrum scan, peak capture and other functions . Its principle block diagram is as follows:
basic requirements:
1. Input impedance: 50 ohms (5 points)
2. Test frequency range: 325MHz to 3 GHz (5 points)
3. Resolution Bandwidth (RBW): 100Hz, 300Hz, 1KHz, 3KHz, 10KHz, 30KHz, 100KHz, 300KHz, 1 MHz, 3MHz, 10MHz are optional (13 points)
4. Dynamic range: greater than 60dB when RBW=100Hz; greater than 30dB when RBW=10MHz (15 points)
5. Test amplitude error: less than 1dB (10 points)
6. Test frequency error: when testing with different RBW settings, it is less than 1% of the corresponding RBW (12 points)
Extended requirements:
- Frequency extension range: 70MHz to 6GHz (5 points)
2. AM, FM, ASK, FSK, BPSK modulation recognition (20 points)
Carrier frequency: 433MHz Modulation signal: voice signal
3. Measurement of modulation degree and intermodulation distortion of AM modulated signal (15 points)
Carrier frequency: 433MHz Modulation signal: single tone signal
2. Design of OFDM modulation and demodulation system
Implement a real OFDM modulation and demodulation system on the PLUTO software radio platform to realize the transmission of audio and video/text files, including data modulation (including 64QAM, 16QAM and QPSK three methods), IFFT transformation, up-conversion carrier modulation, RF transmission , RF reception, down-conversion carrier extraction, low-pass filtering, FFT transformation and data demodulation and other processes
The basic requirements are as follows:
- Carrier frequency: 433MHz (5 points)
- Transfer file: single file 10Mb (5 points)
- Digital modulation methods: 64QAM, 16QAM and QPSK (one of them) (10 points)
- Number of subcarriers: ≧4 (10 points)
5. Total modulation bandwidth: ≦16MHz (10 points)
6. Baseband transmission rate: ≧1Mbps (10 points)
7. Transmission distance: 2 meters (10 points)
Extended requirements:
- Multiple file transfer: video file, audio file, text file (multiple or mixed files) (15 points)
- Mixed modulation: 64QAM, 16QAM and QPSK (two or three) (15 points)
- Transmission distance: >2 meters (10 points)
The system design will be revealed after the game is finished, and I wish you a good result. If there is any infringement, private message me to delete.
