Minimize Bit Error Rate of Massive MIMO System using MMSE Equalization Technique
Keywords:
MC CDMA, OFDM, MMSE, MPCEAbstract
The MMSE equalization alone is not an efficient way of reducing ISI, as the equalization is not carried out with the knowledge of channel impairments. To strengthen the effect of equalization for reducing ISI, channel estimation is used to estimate the amplitude and phase shift caused by the wireless channel impairments. A modified pilot channel estimation (MPCE) is proposed for a MIMO MC-CDMA system in which the number and position of pilots are varied dynamically based on the channel condition. Apart from MPCE-based MMSE equalization in the receiver, improved transmit beamforming (ITBF) is incorporated as a preventive measure where an array of antennas is “directed” at a desired target or source by adjusting the relative gain and phase of the array elements. To further improve the system performance, novel relays (NR) are utilized for contiguous coverage of areas with high traffic density. Therefore, cost-efficient alternative deployment concepts are needed. One promising alternative deployment is a novel relay with MPCE-based equalization and ITBF to extend the high-throughput coverage of next-generation mobile networks.
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