Improving spectral efficiency in large-array FDD systems with hybrid beamforming

2016 ◽  
Author(s):  
Daniel C. Araujo ◽  
Eleftherios Karipidis ◽  
Andre L. F. de Almeida ◽  
Joao C. M. Mota
Keyword(s):  
Spectral Efficiency ◽  
Large Array ◽  
Hybrid Beamforming

scholarly journals Radio-frequency chain selection for energy and spectral efficiency maximization in hybrid beamforming under hardware imperfections

2020 ◽  
Vol 476 (2244) ◽  
pp. 20200451
Author(s):  
Evangelos Vlachos ◽  
John Thompson ◽  
Aryan Kaushik ◽  
Christos Masouros
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Radio Frequency ◽  
Spectral Efficiency ◽  
Significant Loss ◽  
System Modelling ◽  
Next Generation ◽  
Hardware Complexity ◽  
Millimetre Wave ◽  
Hybrid Beamforming

The next-generation wireless communications require reduced energy consumption, increased data rates and better signal coverage. The millimetre-wave frequency spectrum above 30 GHz can help fulfil the performance requirements of the next-generation mobile broadband systems. Multiple-input multiple-output technology can provide performance gains to help mitigate the increased path loss experienced at millimetre-wave frequencies compared with microwave bands. Emerging hybrid beamforming architectures can reduce the energy consumption and hardware complexity with the use of fewer radio-frequency (RF) chains. Energy efficiency is identified as a key fifth-generation metric and will have a major impact on the hybrid beamforming system design. In terms of transceiver power consumption, deactivating parts of the beamformer structure to reduce power typically leads to significant loss of spectral efficiency. Our aim is to achieve the highest energy efficiency for the millimetre-wave communications system while mitigating the resulting loss in spectral efficiency. To achieve this, we propose an optimal selection framework which activates specific RF chains that amplify the digitally beamformed signals with the analogue beamforming network. Practical precoding is considered by including the effects of user interference, noise and hardware impairments in the system modelling.

scholarly journals Design and Development of Novel Hybrid Precoder for Millimeter-Wave MIMO System

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
SRINIVAS K ◽  
T Srinivasulu
Keyword(s):  
Millimeter Wave ◽  
Spectral Efficiency ◽  
Large Scale ◽  
Processing Time ◽  
Mimo Systems ◽  
Mimo System ◽  
Phase Shifters ◽  
Additional Element ◽  
Factorization Problem ◽  
Hybrid Beamforming

Power consumption and hardware cost reduction with the use of hybrid beamforming in large-scale millimeter wave MIMO systems. The large dimensional analog precoding integrates with the hybrid beamforming based on the phase shifters including digital precoding with lower dimensionality. The reduction of Euclidean distance between the hybrid precoder and fully digital is the major problem to overcome the minimization of resultant spectral efficiency. The issue formulates as a fully digital precoder’s matrix factorization problem based on the analog RF precoder matrix and the digital baseband precoder matrix. An additional element-wise unit modulus constraint is imposed by the phase shifters on the analog RF precoder matrix. The traditional methods have a problem of performance loss in spectral efficiency. In the processing time and iteration, high complexities result in optimization algorithms. In this paper, a novel low complexity algorithm proposes which maximizes the spectral efficiency and reduces the computational processing time. 

scholarly journals Hybrid Beamforming Design for Wideband MmWave Full-Duplex Systems

2021 ◽  
Author(s):  
Elyes Balti
Keyword(s):  
Spectral Efficiency ◽  
Beam Steering ◽  
Full Duplex ◽  
Communication Performance ◽  
Received Power ◽  
New Radio ◽  
System 2 ◽  
Hybrid Beamforming ◽  
Value Decomposition ◽  
System 1

Full duplex (FD), which allows bidirectional transmission over the same resources, has the potential to reduce latency and double spectral efficiency. Recently, FD has been studied in 5G LTE millimeter wave cellular communications for New Radio in 3GPP releases 15--17. The primary drawback of FD is self-interference (SI). SI arises in the receiver for system 1 because it receives transmissions from itself and system 2. Because system 1 is much closer, SI can be 100-1000x the received power from system 2, thereby severely degrading communication. In this paper, we investigate a FD relay extending mmWave coverage to a single user. We propose to use alternating projections in designing the precoder and combiner to maximize the sum of the uplink and downlink spectral efficiency while bringing the SI below the noise floor. Our contributions include (1) all-digital and hybrid beamforming design algorithms for SI cancellation; and (2) communication performance analysis in terms of spectral efficiency, energy efficiency and outage probability. We compare the proposed algorithms against beam steering, singular value decomposition, and angle search techniques.

scholarly journals Beamforming with Precoders Based Millimeter Wave Communication System

2019 ◽  
Vol 9 (1) ◽  
pp. 4795-4799
Keyword(s):  
Wireless Communication ◽  
Millimeter Wave ◽  
Spectral Efficiency ◽  
Communication System ◽  
System Performance ◽  
Mimo System ◽  
Wireless Communication System ◽  
Hybrid Beamforming ◽  
Millimeter Wave Communication

The 5G communications are used with baseband Precoders and Beamforming. The Technology is needed to update, all available characteristics in the present Wireless Communication System (WCS). The Hybrid Beamforming systems are across in the RF and Digital domain. In the mmWave MIMO system, the numbers of antennas has increased to improve the Spectral Efficiency of the system. The proposed algorithms observe that system performance for different SNR range.

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