Anti-interference Performance of QPSK Modulation and Demodulation Technology in Mobile Communication with MATLAB Simulation

In the field of modern mobile communication, (Quadrature Phase Shift Keying) QPSK modulation technology is widely used, which has a great advantage that it can work normally in a limited frequency band, and the adaptability to background noise is also good. However, in actual use, we find that when encountering some special circumstances, the ordinary QPSK system will expose many problems. For example, in some wireless equipment-intensive places, or in the environment where there is a radar signal, the frequency of the signal transmission path is not stable, QPSK performance will be greatly reduced. More miscoding errors will occur, and it is particularly difficult to control the error rate below 10^(-3). These problems are commonly solved by adjustable filters and interference elimination techniques. However, these methods need to consider several aspects. They must ensure that the amount of computation is not too large and also take into account spectrum utilization and anti-interference performance. At the same time, dealing with premeditated interference attacks or large-scale interference is especially difficult.