دورية أكاديمية
Analysis and Design of SCMA-Based Hybrid Unicast-Multicast Relay-Assisted Networks
العنوان: | Analysis and Design of SCMA-Based Hybrid Unicast-Multicast Relay-Assisted Networks |
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المؤلفون: | Yibo Zhang, Xiaoxiang Wang, Dongyu Wang, Yufang Zhang, Yanwen Lan |
المصدر: | Sensors, Vol 19, Iss 2, p 329 (2019) |
بيانات النشر: | MDPI AG, 2019. |
سنة النشر: | 2019 |
المجموعة: | LCC:Chemical technology |
مصطلحات موضوعية: | SCMA, wireless multicast, relay, cooperative transmission, outage probability, optimal relay design, Chemical technology, TP1-1185 |
الوصف: | This paper studies a multi-user network model based on sparse code multiple access (SCMA), where both unicast and multicast services are considered. In the direct transmission scheme, the communication between the base station (BS) and the users is completed with one stage, in which the relay is inexistent. In the two-stage cooperative transmission scheme, any number of relays are placed to improve the reliability of wireless communication system. The BS broadcasts the requested message to users and relays in the first stage, and the successful relays forward the message to unsuccessful users in the second stage. To characterize the performance of these two schemes, we derive the exact and approximate expressions of average outage probability. Furthermore, to take full advantage of the cooperative diversity, an optimal power allocation and relay location strategy in the high signal-to-noise ratio (SNR) regime is studied. The outage probability reaches the minimum value when the first stage occupies half of the total energy consumed. Simulation and analysis results are presented to demonstrate the performance of these two schemes. The results show that the two-stage cooperative scheme effectively reduce the average outage probability in SCMA network, especially in the high SNR region. |
نوع الوثيقة: | article |
وصف الملف: | electronic resource |
اللغة: | English |
تدمد: | 1424-8220 78661242 |
Relation: | http://www.mdpi.com/1424-8220/19/2/329; https://doaj.org/toc/1424-8220 |
DOI: | 10.3390/s19020329 |
URL الوصول: | https://doaj.org/article/4d536d78661242c3b7cc76888eb37f64 |
رقم الأكسشن: | edsdoj.4d536d78661242c3b7cc76888eb37f64 |
قاعدة البيانات: | Directory of Open Access Journals |
تدمد: | 14248220 78661242 |
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DOI: | 10.3390/s19020329 |