Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems
Hybrid precoding has emerged as a promising technique to reduce the hardware cost and complexity in millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems. However, due to the drastic increase in the number of user devices and higher data rate demand, new frequency bands (i.e...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2020-01-01
|
| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9294139/ |
| _version_ | 1818681622250127360 |
|---|---|
| author | Talha Mir Muhammad Waqas Usama Mir Syed Mudassir Hussain Ahmet M. Elbir Shanshan Tu |
| author_facet | Talha Mir Muhammad Waqas Usama Mir Syed Mudassir Hussain Ahmet M. Elbir Shanshan Tu |
| author_sort | Talha Mir |
| collection | DOAJ |
| description | Hybrid precoding has emerged as a promising technique to reduce the hardware cost and complexity in millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems. However, due to the drastic increase in the number of user devices and higher data rate demand, new frequency bands (i.e., terahertz (THz) communications) are needed to explore. At THz frequencies, the precoding technique can provide a large beamforming gain, but still, the blockage and high path-loss remain a significant problem. To overcome the blockage problem, in this paper, we introduce the two-way relay design where the well-known two-way amplify-and-forward (AF) relay in THz-MIMO orthogonal frequency-division multiplexing (OFDM) systems is employed. The optimal two-way relay hybrid precoding problem is non-convex due to the practical hardware constraints (i.e., unit-modulus and block-diagonal constraints). To solve this problem, we first propose to use mathematical manipulations to remove the block-diagonal constraints from its analog part and then reformulate the original two-way relay hybrid precoding problem into a quadratic-convex problem with only power constraint. Finally, we obtain the closed-form solution for the two-way relay hybrid precoding problem. Simulation results reveal that our proposed solution can achieve better sum-rate and energy efficiency than existing hybrid schemes. |
| first_indexed | 2024-12-17T10:05:52Z |
| format | Article |
| id | doaj.art-5b7a77cd9a94408a8025d35580903a3c |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-17T10:05:52Z |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-5b7a77cd9a94408a8025d35580903a3c2022-12-21T21:53:10ZengIEEEIEEE Access2169-35362020-01-01822266022267110.1109/ACCESS.2020.30449079294139Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO SystemsTalha Mir0Muhammad Waqas1https://orcid.org/0000-0003-0814-7544Usama Mir2Syed Mudassir Hussain3https://orcid.org/0000-0003-0840-4088Ahmet M. Elbir4Shanshan Tu5https://orcid.org/0000-0002-6220-4119Department of Electronics Engineering, Balochistan University of Information Technology, Engineering, and Management Sciences, Quetta, PakistanEngineering Research Center of Intelligent Perception and Autonomous Control, Faculty of Information Technology, Beijing University of Technology, Beijing, ChinaDepartment of Information Technology, Saudi Electronic University, Dammam, Saudi ArabiaDepartment of Electronics Engineering, Balochistan University of Information Technology, Engineering, and Management Sciences, Quetta, PakistanDepartment of Electrical and Electronics Engineering, Duzce University, Duzce, TurkeyEngineering Research Center of Intelligent Perception and Autonomous Control, Faculty of Information Technology, Beijing University of Technology, Beijing, ChinaHybrid precoding has emerged as a promising technique to reduce the hardware cost and complexity in millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems. However, due to the drastic increase in the number of user devices and higher data rate demand, new frequency bands (i.e., terahertz (THz) communications) are needed to explore. At THz frequencies, the precoding technique can provide a large beamforming gain, but still, the blockage and high path-loss remain a significant problem. To overcome the blockage problem, in this paper, we introduce the two-way relay design where the well-known two-way amplify-and-forward (AF) relay in THz-MIMO orthogonal frequency-division multiplexing (OFDM) systems is employed. The optimal two-way relay hybrid precoding problem is non-convex due to the practical hardware constraints (i.e., unit-modulus and block-diagonal constraints). To solve this problem, we first propose to use mathematical manipulations to remove the block-diagonal constraints from its analog part and then reformulate the original two-way relay hybrid precoding problem into a quadratic-convex problem with only power constraint. Finally, we obtain the closed-form solution for the two-way relay hybrid precoding problem. Simulation results reveal that our proposed solution can achieve better sum-rate and energy efficiency than existing hybrid schemes.https://ieeexplore.ieee.org/document/9294139/Terahertz communicationsmassive MIMOhybrid precodingtwo-way relay |
| spellingShingle | Talha Mir Muhammad Waqas Usama Mir Syed Mudassir Hussain Ahmet M. Elbir Shanshan Tu Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems IEEE Access Terahertz communications massive MIMO hybrid precoding two-way relay |
| title | Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems |
| title_full | Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems |
| title_fullStr | Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems |
| title_full_unstemmed | Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems |
| title_short | Hybrid Precoding Design for Two-Way Relay-Assisted Terahertz Massive MIMO Systems |
| title_sort | hybrid precoding design for two way relay assisted terahertz massive mimo systems |
| topic | Terahertz communications massive MIMO hybrid precoding two-way relay |
| url | https://ieeexplore.ieee.org/document/9294139/ |
| work_keys_str_mv | AT talhamir hybridprecodingdesignfortwowayrelayassistedterahertzmassivemimosystems AT muhammadwaqas hybridprecodingdesignfortwowayrelayassistedterahertzmassivemimosystems AT usamamir hybridprecodingdesignfortwowayrelayassistedterahertzmassivemimosystems AT syedmudassirhussain hybridprecodingdesignfortwowayrelayassistedterahertzmassivemimosystems AT ahmetmelbir hybridprecodingdesignfortwowayrelayassistedterahertzmassivemimosystems AT shanshantu hybridprecodingdesignfortwowayrelayassistedterahertzmassivemimosystems |