Asynchronous NOMA for Downlink Transmissions
| Autor: | Guinian Feng, Haitao Li, Guangliang Dong, Jianxiong Cui, Shengli Zhang |
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| Rok vydání: | 2017 |
| Předmět: |
Computer science
050801 communication & media studies 02 engineering and technology Interference (wave propagation) Precoding Noma Base station symbols.namesake 0508 media and communications Control theory Telecommunications link 0202 electrical engineering electronic engineering information engineering medicine Detection theory Electrical and Electronic Engineering Rayleigh scattering 05 social sciences 020206 networking & telecommunications medicine.disease Computer Science Applications Single antenna interference cancellation Asynchronous communication Modeling and Simulation symbols Algorithm Communication channel |
| Zdroj: | IEEE Communications Letters. 21:402-405 |
| ISSN: | 1089-7798 |
| Popis: | In this letter, we propose a novel symbol-asynchronous non-orthogonal multiple access (ANOMA) scheme for downlink transmissions. First, ANOMA introduces an artificial symbol-offset between packets destined for different user equipment (UE) in order to reduce their mutual interference. Second, ANOMA adopts a pre-coding at the base station and a whitening-and-decomposing (WD) detection scheme at the receiving UE to simplify signal detection. With these two novel techniques, ANOMA can significantly enlarge the achievable rate region of the traditional non-orthogonal multiple access (NOMA). Moreover, the impact of pulse shape and symbol offset on the performance of ANOMA scheme are investigated in both Gaussian and Rayleigh block-fading channels. The numerical results show that ANOMA with precoding and WD detection outperforms asynchronous NOMA with successive interference cancellation detection, both outperform synchronous NOMA. |
| Databáze: | OpenAIRE |
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