Symbol-Level and Multicast Precoding for Multiuser Multiantenna Downlink: A State-of-the-Art, Classification, and Challenges
| Autor: | Bjorn Ottersten, Danilo Spano, Dimitrios Christopoulos, Christos G. Tsinos, Symeon Chatzinotas, Maha Alodeh, Ashkan Kalantari |
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| Rok vydání: | 2018 |
| Předmět: |
Computer science
multicast Context (language use) 02 engineering and technology Precoding Electrical & electronics engineering [C06] [Engineering computing & technology] 0203 mechanical engineering Telecommunications link 0202 electrical engineering electronic engineering information engineering multiuser MISO Electrical and Electronic Engineering channel state information Ingénierie électrique & électronique [C06] [Ingénierie informatique & technologie] Multicast business.industry Data stream mining symbol-level precoding 020206 networking & telecommunications 020302 automobile design & engineering broadcast block-level precoding unicast Channel state information Directional modulation Unicast business Computer network Communication channel |
| Zdroj: | IEEE Communications Surveys and Tutorials. New York, NY: IEEE Communications Society (2018). |
| ISSN: | 2373-745X |
| DOI: | 10.1109/comst.2018.2837001 |
| Popis: | Precoding has been conventionally considered as an effective means of mitigating or exploiting the interference in the multiantenna downlink channel, where multiple users are simultaneously served with independent information over the same channel resources. The early works in this area were focused on transmitting an individual information stream to each user by constructing weighted linear combinations of symbol blocks (codewords). However, more recent works have moved beyond this traditional view by: 1) transmitting distinct data streams to groups of users and 2) applying precoding on a symbol-per-symbol basis. In this context, the current survey presents a unified view and classification of precoding techniques with respect to two main axes: 1) the switching rate of the precoding weights, leading to the classes of block-level and symbol-level precoding and 2) the number of users that each stream is addressed to, hence unicast, multicast, and broadcast precoding. Furthermore, the classified techniques are compared through representative numerical results to demonstrate their relative performance and uncover fundamental insights. Finally, a list of open theoretical problems and practical challenges are presented to inspire further research in this area 1 . 1 The concepts of precoding and beamforming are used interchangeably throughout this paper. |
| Databáze: | OpenAIRE |
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