hybridprecoding, combining the digital and analogue precoding, is a key enabler to reach a compromise between system performance and hardware complexity in millimetre wave (mmWave) massive multiple-input multiple-out...
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hybridprecoding, combining the digital and analogue precoding, is a key enabler to reach a compromise between system performance and hardware complexity in millimetre wave (mmWave) massive multiple-input multiple-output (MIMO) systems. Most previous studies on hybridprecoding considered narrowband channels. However, mmWave systems are expected to operate on wideband channels with frequency selectivity. In this study, the authors focus on the hybridprecoding design in mmWave massive MIMO systems using orthogonal frequency division multiplexing (OFDM). By transforming the hybrid precoding problem into a series of sub-problems, they propose a low-complexity algorithm to design the digital precoder and analogue precoder alternately. In particular, a phase pursuit method is introduced to seek this solution of analogue precoding matrix with the constant amplitude constraint. Simulation results and complexity evaluations reveal that the proposed algorithm can obtain better performance and lower complexity than some existing solutions in mmWave OFDM systems.
In this letter, the authors report a beam squint compensation method for hybridprecoding in millimetre-wave communication systems. With the objective to maximise the spectral efficiency, they formulate the hybrid pre...
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In this letter, the authors report a beam squint compensation method for hybridprecoding in millimetre-wave communication systems. With the objective to maximise the spectral efficiency, they formulate the hybrid precoding problem considering the beam-squinting analogue precoder and reveal its performance loss compared with the ideal identical analogue precoder. They also design a simple but effective compensation matrix for hybridprecoding to reduce the impact of beam squint. Simulation results confirm the performance loss caused by beam squint and reveal the performance gain of the proposed method.
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