Because of the simplicity and low complexity theme, the work in thesis is focused towards simple beamforming techniques and predominantly DL beamforming. This is in line with current thinking for future 5G systems where, because of the advent of large scale antenna systems and highly focused beams, more conventional and complex techniques such as spatial multiplexing MIMO are considered less appropriate. In addition, the work has provided some alternative views on the design of 5G SBSs assuming millimetre wave technology is adopted. The arguments for single antenna system suitability and alternative architectures for the physical layer have been provided. These being substantiated by expected performance, complexity and EE. It is inevitable that future SBSs will be equipped with multiple antennas, either to improve SE or to overcome eroded link margin in the case of mmWave. The multiple antennas will be embodied into the SBS. The work in this thesis, therefore provides a suitable reference concerning design approaches for low complexity and anticipated EE. Future Work This thesis has covered a range of access technologies and addressed a range of considerations for the design of SBSs focusing 3rd, 4th and 5th generation wireless. Looking further towards future 5G small cell networks using mmWave, it is evident that there are a number of specific challenges to address to maintain low complex and energy efficient solutions for the SBS; particularly in indoor deployments. Current research in the field advocates the use of large antenna array systems to overcome eroded link margin and because of highly optimised and concentrated beamforming and low multipath capture, expects receiver implementations to be low in complexity and without the need for equalisation and error correction schemes. While this seems a rational assumption, and as has been discussed in this thesis, there are potential issues surrounding this high level approach that need further research and analysis. The following discusses some identified deficiencies in the analysis presented in this thesis that should be considered to further focus the specific case of the indoor SBS for 5G. 5G Dense Deployments Interference Isolation – The work on mmWave has shown that there is potential to have highly isolated small cells. Here, because of the excessive path loss leading to a reduced RF footprint, interference is minimised. In addition, the interference to and from the MBS layer is minimised because of possible path loss through buildings and structures. This should result in the ability to achieve acceptable QoS with a
Because of the simplicity and low complexity theme, the work in thesis is focused towards simple beamforming techniques and predominantly DL beamforming. This is in line with current thinking for future 5G systems where, because of the advent of large scale antenna systems and highly focused beams, more conventional and complex techniques such as spatial multiplexing MIMO are considered less appropriate. In addition, the work has provided some alternative views on the design of 5G SBSs assuming millimetre wave technology is adopted. The arguments for single antenna system suitability and alternative architectures for the physical layer have been provided. These being substantiated by expected performance, complexity and EE. It is inevitable that future SBSs will be equipped with multiple antennas, either to improve SE or to overcome eroded link margin in the case of mmWave. The multiple antennas will be embodied into the SBS. The work in this thesis, therefore provides a suitable reference concerning design approaches for low complexity and anticipated EE. Future Work This thesis has covered a range of access technologies and addressed a range of considerations for the design of SBSs focusing 3rd, 4th and 5th generation wireless. Looking further towards future 5G small cell networks using mmWave, it is evident that there are a number of specific challenges to address to maintain low complex and energy efficient solutions for the SBS; particularly in indoor deployments. Current research in the field advocates the use of large antenna array systems to overcome eroded link margin and because of highly optimised and concentrated beamforming and low multipath capture, expects receiver implementations to be low in complexity and without the need for equalisation and error correction schemes. While this seems a rational assumption, and as has been discussed in this thesis, there are potential issues surrounding this high level approach that need further research and analysis. The following discusses some identified deficiencies in the analysis presented in this thesis that should be considered to further focus the specific case of the indoor SBS for 5G. 5G Dense Deployments – Interference Isolation The work on mmWave has shown that there is potential to have highly isolated small cells. Here, because of the excessive path loss leading to a reduced RF footprint, interference is minimised. In addition, the interference to and from the MBS layer is minimised because of possible path loss through buildings and structures. This should result in the ability to achieve acceptable QoS with a
PhDThesisWithCorrections.docx