Abstract
In this paper, a coordinated multipoint joint transmission (CoMP-JT) framework at mmWave for a cyclic prefix (CP)-free multiuser OFDM wireless communication system is developed and analyzed. The aim is to provide high-quality service to cell-edge users; otherwise, the cell-users would suffer from significant signal degradation due to undesired interference. The impact of complex Hadamard transform with block diagonalization channel precoding for multiuser interference reduction and designed subcarrier mapping for out-of-band (OOB) reduction are investigated. In addition, the paper studied the input back-off-aided high-power amplifier for peak-to-average power ratio (PAPR) reduction and forward error correction channel coding for improved bit error rate (BER) for cell-edge users at mmWave frequencies. Moreover, signal-to-interference-noise ratio and ergodic achievable rate are estimated both in the presence and absence of CoMP-JT-based transmission technique to verify their significance in terms of transmitted power. Numerical investigations showed an OOB reduction of 312 dB, PAPR reduction from 17.50 dB to 7.66 dB, and improved BER of 1×10−3 in 16-QAM for a signal-to-noise ratio of −6 dB. Hence, the simulation results demonstrated the effectiveness of the developed system.
Highlights
Coordinated multipoint (CoMP) techniques reduce intercell interference and increase the cell-edge throughput by integrating numerous evolved node base stations’ transmissions
The current study is carried out with the speculation that the channel state information (CSI) of the mmWave path loss incorporated multiple-input multiple-output (MIMO) Rayleigh fading channel is accessible from the receiver and the nature of the flat fading channel coefficients is unaltered during the period of simulation
Ergodic achievable rates are estimated with varying transmitting antenna height at a certain covered distance between two base stations (BSs)
Summary
Coordinated multipoint (CoMP) techniques reduce intercell interference and increase the cell-edge throughput by integrating numerous evolved node base stations’ (eNBs) transmissions. To accomplish the features of the future generation wireless communication systems, such as speedy data rate with outstanding link quality and unlimited access, priority is being given to the implementation of CoMP ultra-dense, small-cell network (SCN)-based transmission, where SCN allows the additional flexible establishment and excellent communication link quality. To achieve better throughput and vigorous mobility, the dual connectivity (DC) technique is presented in 3rd generation partnership project (3GPP) release 12 by utilizing radio resources from different eNBs. In comparison with release-11 carrier aggregation (CA), DC is an effective technique introducing standalone secondary eNB (SeNB) for small-cell deployment. For the case of DC-associated UE, it can establish concurrent connections with a master eNB (MeNB) and SeNB Both eNBs operate at different carrier frequencies and maintain an interconnection using general backhaul links [5,6]. The use of CP in OFDM is the most popular way to suppress intersymbol interference (ISI); its waste of spectrum resources cannot be neglected when considering the ever-growing high-speed demand [12]
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