Design and Testing of a Transmitter-Channel-Receiver Model Using Matlab 5G Toolset

Abstract

Make possible new incoming services and enhance the current ones in order to improve our lives, is the common objective of the engineers. In this way, for improving our communications, we have passed through four generations, each of them with its corresponding enhancements. However, the fourth generation has some limitations that must be solved to keep evolving our communications. Hence, the fifth generation (5G) is forecast to be launched in 2020. This thesis is based on 5G and it has approached three different objectives by using Matlab 5G Toolset. First, the study of 5G waveforms has been carried out. These waveforms are W-OFDM, F-OFDM and CP-OFDM and their spectrums have been compared for different bandwidths and subcarrier spacings. Then, a basic transmitter-channel-receiver chain model has been designed and tested in terms of bit error rate. Finally, a new configuration for improving the reliability of 5G communi-cations, based on 3GPP, has been designed and proved. This configuration includes some vari-ations related with the spatial diversity, the HARQ protocol and the code rate.

The analysis of the results has shown that F-OFDM and W-OFDM achieve better spectral efficiency than CP-OFDM. However, W-OFDM presents more out of band emissions. Thus, F-OFDM with a small value of subcarrier spacing presents better performance than CP-OFDM and W-OFDM in terms of spectral efficiency and out of band emissions. In addition, during the testing of the designed model, CP-OFDM has demonstrated better bit error rate than F-OFDM and W-OFDM. Nevertheless, F-OFDM and CP-OFDM present very similar results. In addition, the new 5G configuration proposed was applied into the transmitter-channel-receiver model commented before for CP-OFDM. The new result was compared with the previous one in terms of bit error rate. Finally, this comparation shows that better bit error rate values are achieved with this new configuration. Thus, the reliability of the communications is improved.