The Development Direction of Digital Microwave Communication Technology

　　Due to the different characteristics of digital microwave communication technology itself, its development direction has also shown diversified features, as follows:

　　1. Improve the QAM modulation level. For current digital microwave communication technology, in order to effectively improve its spectrum utilization, it is generally necessary to use multi-level QAM, which is orthogonal amplitude modulation. At present, 512QAM is mainly used, and 1024QAM or 2048QAM may be used in the future. Based on this, there are higher requirements in the design of channel filters, which require that their cosine roll off coefficient can be maintained to a certain extent.

　　2. The application of grid coding modulation technology and Viterbi detection technology. To effectively reduce the system error rate, it is necessary to use error correction coding techniques with complex characteristics. However, utilizing this technology will reduce the efficiency of frequency band utilization. Therefore, grid coding modulation technology plays a substantial processing role in it. On the basis of using grid coding modulation technology, it is also necessary to use Viterbi algorithm to complete decoding. Currently, using this type of decoding algorithm in high-speed digital signal transmission poses certain difficulties.

　　3. The application of adaptive time-domain equalization technology. To effectively reduce the intersymbol interference rate, it is necessary to use adaptive time-domain equalization technology, which has multiple advantages such as high performance and full digitization. At the same time, the use of this technology can effectively avoid problems such as orthogonal interference and multipath fading to a certain extent.

　　4. The application of multi carrier parallel transmission technology. To effectively reduce the rate of transmitting symbols and avoid the impact of propagation dispersion, the application of multi carrier parallel transmission technology plays a substantial role. At the same time, this technology can effectively reduce the instantaneous interruption rate, generally to 1/10 of before the change. In addition, with the development of digital microwave communication technology, nonlinear pre correction of transmitting power amplifiers can also be widely applied.

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