Abstract
Harnessing the abundant availability of spectral resources at millimeter wave (mmWave) frequencies is an attractive solution to meet the escalating data rate demands. Additionally, it has been shown that full-duplex (FD) communication has the potential of doubling the bandwidth efficiency. However, the presence of significant residual self-interference (SI), which is especially more pronounced at mmWave frequencies because of the non-linearities in the hardware components, erodes the full potential of FD in practice. Conventionally, the residual SI is canceled in the baseband using digital processing with the aid of a transmit precoder. In this work, we propose a hybrid beamforming design for FD mmWave communications, where the SI is canceled by the joint design of beamformer weights at the radio-frequency and the precoder as well as combiner in the baseband. Our proposed design preserves the dimensions of the transmit signal, while suppressing the SI. We demonstrate that our joint design is capable of reducing the SI by upto 30 dB, hence performing similarly to the interference-free FD system while being computationally efficient. Our simulation results show that the proposed design significantly outperforms eigen-beamforming.
Highlights
G IVEN the escalating mobile data rate demands, the world is pacing toward the generation of wireless communication while aiming for higher spectral efficiency
We characterize the performance of the proposed design and compare it to that of eigen beamforming, where the left and right singular matrices of the corresponding channel are employed
When the signal-to-interference ratios (SIRs) is as low as −30 dB, the proposed design almost completely eliminates the interference and performs close to the system subjected to no interference
Summary
G IVEN the escalating mobile data rate demands, the world is pacing toward the generation of wireless communication while aiming for higher spectral efficiency. Millimeter wave (mmWave) communication has gained much attention as one of the key disruptive technologies to deliver the ever-increasing data rates [1]. Since the spectral resources in the sub-6 GHz bands are already crowded, harnessing the wide bandwidths available at mmWave frequencies can significantly increase the capacity to accommodate a large number of users [1]. The efficient employment of FD techniques at mmWave frequencies would further improve the network’s spectral efficiency. Manuscript received December 20, 2017; revised April 6, 2018 and July 14, 2018; accepted November 27, 2018. Date of publication December 6, 2018; date of current version February 12, 2019.
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