GFDM Zero Forcing Equalizer for Large Doppler Shift in Correlated Double Ring Channel Models

Abstract

The nature of wireless communication channels evolves throughout time. Depending on the channel model, wireless communication channels can also be affected by a number of key factors. In the Correlated Double Ring (CDR) wireless channel model, the channel gain parameters are affected by the movement of vehicles on the transmitter and receiver sides as well as the amount of scatterers surrounding the transmitter and receiver. When bits are transmitted across the CDR channel using a Generalized Frequency Division Multiplexing (GFDM) multi-carrier system, the received bit will be degraded as a result of Doppler shift and multipath. To circumvent this, we use a Zero Forcing (ZF) equalizer to correct the erroneous bits on the receive side. In this study, we simulate data bits transmitted via a CDR channel at various speeds, ranging from low speed to high speed, using a GFDM multicarrier system. The ZF equalization method that we propose to overcome the higher Doppler frequency on a high-speed CDR channel of 95 m/s with the scatterer of 8 has been demonstrated to increase Bit Error Rate (BER) performance in comparison to the emergence of a ZF equalization scheme. In order to counteract the vast number of up to 16 multipaths on CDR channels, the ZF equalization approach can improve the BER performance at 95 m/s when compared to when it is not employed. On the Rician CDR channel, the ZF equalization algorithm can efficiently overcome the highly significant Doppler effect and multipath fading.