Communication Algorithm 4: Nine debugging methods: theoretical error rate and actual error rate, and nine Error Rate

Communication Algorithm 4: Nine debugging methods: theoretical error rate and actual error rate, and nine Error Rate

1. there are nine modulation methods, including BPSK, DBPSK, 2ASK, 2PSK, PSK, opsk, DQPSK, 16QAM, 64QAM, and theoretical error rate formula. You can view the book and use matlab to draw a picture to understand the theoretical error rate.

2. SNR :.

Channel environment: AWGN

Simulation process: modulation + AWGN + demodulation + BER

Based on the matlab simulation program, the following results are obtained,

Actual error rate of DQPSK, 16QAM, and 64QAM.

3. built-in function through matlab: berawgn

4. Use the matlab built-in drawing tool: bertool

<For more information and the corresponding MATLAB code, contact qq: 1279682290>

 
Which of the following methods can be used to reduce the decoding error rate?

Binary digital band transmission system. Bit Error Rate is related to the signal format (modulation mode), noise statistical characteristics, demodulation and decoding decision methods. the error rate of the Multi-hexadecimal digital modulation system is related to the average signal-to-noise ratio and the number of incoming modulation numbers.
For a binary digital band transmission system, regardless of the method or method used, the common feature is that the system's bit error rate decreases as the input signal-to-noise ratio increases. Conversely, when the input signal-to-noise ratio decreases by an hour, the system error rate increases.

Therefore, to reduce the decoding error rate, you need to fine tune the Polarization angle and change the line, check whether the line connection is on well, and check the line aging.

What is the error rate? What is the error rate? What is the definition in digital TV? I am a repair engineer. I must be practical and popular,

Bit error rate (BER: bit error ratio) is an indicator to measure the accuracy of data transmission within the specified time period. Generally speaking, it is the number of wrong data (BITs) ratio to the total number of data, error rate = number of BITs that receive errors/total number of sent bits, usually expressed by the negative power of 10E, for example: one error occurs in 10 thousand-bit data, that is, the error rate is one in one thousandth, that is, BER = 10E-4.
For a set-top box to receive digital TVs, as long as the BER <10E-5 can receive the TV normally (may occasionally have Mosaic), the BER = 10E-4 is basically invisible, and the smaller the BER value, the better the signal quality (of course there are other parameters for reference ). Generally, the minimum value of the BER displayed by an instrument (such as a cable television force meter) is 10E-9, and the minimum value is 10E-9.