Abstract
Terahertz (THz) communication is becoming an up-and-coming technology for the future 6G networks as it offers an ultra-wide bandwidth. Appropriate channel models and precoding techniques are indispensable to support the desired coverage and to resolve the severe path loss in THz signals. Initially, in this work, the Sub-THz channel (140 GHz) response is investigated by using NYUSIM Channel Simulator for 6G indoor office scenario.The major highlight will be on radio propagation mechanisms, which impact the network performnace in the form of path-loss, received power, time delays, azimuth AoD, Azimuth AoA, Elevation AoD, Elevation AoA and RMS delay in LOS environments. Recent hybrid precoding techniques depending upon frequency-independent phase-shifters not able to cope up with the beam split effect in THz massive MIMO systems, where the directional beams will split into various physical directions at various sub-carrier frequencies. The beam split effect will result in a serious array gain loss across the entire bandwidth, which has not been well investigated in THz massive MIMO systems. Therefore, to address this challenge, delay-phase precoding is proposed in this work. We then extensively investigate its diverse number of time delayers, varying number of antenna elements, and comparison with frequency—mmWave and Sub-THz have been discussed. Finally, the proposed delay-phase precoding techniques outperforms the other existing narrowband and wideband precoding techniques. Therefore,it is an effective technique to implement the future 6G indoor communication network deployment.
Highlights
The International Tele-communication Union(ITU) launched the official research investigation over 6G helps to design pioneer wireless networks and to attain self-subsisting networks
To quench out the emerging services and the applications like augmented reality, holographic communications, extremely high definition transmission of videos, the Tera-Hertz(THz) communications acts as a backbone for the future 6G wireless networks. 6G provides the communication with reduced latency for long distance with ultra high reliability
In 5G millimeter wave (mmWave) massive MIMO systems, the generated beams from various sub-carrier frequencies concentrate on various physical directions because of the usage of phase shifters which is independent of frequency and this leads to loss in array gain [16]
Summary
The International Tele-communication Union(ITU) launched the official research investigation over 6G helps to design pioneer wireless networks and to attain self-subsisting networks. The precoding approach helps to resolve path loss problem and in this approach there is no need to increase the power at the transmitter By using this precoding methodology, narrow beams can be generated with large antenna array gain that combats the severe path loss and the entire optimization process will be simplified into sub rate optimization processes and its complexity is evaluated [8]. In order to realize a wireless backhaul with an ultra-high speed, it is vital to analyze the bandwidth, transmission distance and the physical properties of the channel To address these challenges in THz band, the distance can be enhanced by using distance aware bandwidth adaptive methodology. This approach capture all the distinct eccentricities of the channel and uses a full spectrum of resources by enabling several high-speed links. Advanced communication methodologies are needed to enhance the distance for transmission and this helps to provide simultaneous operation of ultra high speed links [10]
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