scholarly journals Cooperative Transmission Protocols with High Spectral Efficiency and High Diversity Order Using Multiuser Detection and Network Coding

2007 ◽  
Author(s):  
Z. Han ◽  
X. Zhang ◽  
H. V. Poor
Keyword(s):  
Network Coding ◽  
Multiuser Detection ◽  
Spectral Efficiency ◽  
Cooperative Transmission ◽  
Diversity Order ◽  
High Spectral Efficiency ◽  
High Diversity

scholarly journals A Novel Cooperative Network Using Down-link Non-orthogonal Multiple Access Scheme

2021 ◽  
Author(s):  
Syed Agha Hassnain Mohsan ◽  
Moqbel Ali Mohammed Hamood ◽  
Syed Muhammad Tayyab Shah ◽  
Alireza Mazinani
Keyword(s):  
Spectral Efficiency ◽  
Multiple Access ◽  
Main Idea ◽  
Base Station ◽  
Cooperative Transmission ◽  
Diversity Order ◽  
Efficiency Gain ◽  
Cooperative Network ◽  
Access Scheme ◽  
Better Than

Abstract A novel downlink cooperative non-orthogonal multiple access (DC-NOMA) scheme is proposed in this paper to achieve higher performance in the spectral efficiency compared to the classical NOMA schemes. The communication system consists of one base station and two users (e.g., strong user and weak user). In down link phase, the base station transmits a superimposed signal to both users, and in the cooperative phase, the weak user sends its decoded message to the strong user. The main idea is how the weak user can help the strong user to improve the performance of both users. This occurs by enabling the weak user to perform a cooperative transmission with the strong user during the cooperative phase. The outage probability, outage throughput, and diversity order are derived and analyzed. Numerical results are provided to show that the spectral efficiency gain achieved through our proposed scheme is better than the conventional cooperative NOMA schemes.

Waveforms with High Spectral Efficiency for Terahertz Communications

2021 ◽  
Author(s):  
Mohamed Shehata ◽  
Ke Wang ◽  
Julian Webber ◽  
Masayuki Fujita ◽  
Tadao Nagatsuma ◽  
...  
Keyword(s):  
Spectral Efficiency ◽  
Terahertz Communications ◽  
High Spectral Efficiency

High-Spectral-Efficiency Mode-Multiplexed Transmission Over Graded-Index Multimode Fiber

2018 ◽  
Author(s):  
Roland Ryf ◽  
Nicolas K. Fontaine ◽  
Steffen Wittek ◽  
Karthik Choutagunta ◽  
Mikael Mazur ◽  
...  
Keyword(s):  
Spectral Efficiency ◽  
Multimode Fiber ◽  
Graded Index ◽  
High Spectral Efficiency
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