TY - JOUR
T1 - Design and Evaluation of Buffer-Aided Cooperative NOMA with Direct Transmission in IoT
AU - Xu, Peng
AU - Wang, Yunwu
AU - Chen, Gaojie
AU - Pan, Gaofeng
AU - Ding, Zhiguo
N1 - Funding Information:
Manuscript received June 30, 2020; revised November 5, 2020; accepted November 30, 2020. Date of publication December 4, 2020; date of current version May 7, 2021. The work of Peng Xu was supported in part by the National Natural Science Foundation of China under Grant 61701066 and Grant 61971080, and in part by the Chongqing Natural Science Foundation Project under Grant cstc2019jcyj-msxmX0032. The work of Gaojie Chen was supported by Engineering and Physical Sciences Research Council (EPSRC) under Grant EP/R006377/1 (M3NETs). This article was presented in part at IEEE/CIC International Conference on Communications in China (ICCC), Chongqing, China, Aug. 2020. (Corresponding author: Peng Xu.) Peng Xu and Yunwu Wang are with the Chongqing Key Laboratory of Mobile Communications Technology, School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China (e-mail: [email protected]; [email protected]).
Publisher Copyright:
© 2014 IEEE.
PY - 2021/5/15
Y1 - 2021/5/15
N2 - The high spectrum efficiency of nonorthogonal multiple access (NOMA) is attractive to solve the massive number of connections in the Internet of Things (IoT). This article investigates a buffer-aided cooperative NOMA (C-NOMA) system in the IoT, where the intended users are equipped with buffers for cooperation. The direct transmission from the access point to the users and the buffer-aided cooperative transmission between the intended users are coordinated. In particular, a novel buffer-aided C-NOMA scheme is proposed to adaptively select a direct or cooperative transmission mode, based on the instantaneous channel state information and the buffer state. Then, the performance of the proposed scheme, in terms of the system outage probability and average delay, is theoretically derived with closed-form expressions. Furthermore, the full diversity order of three is demonstrated to be achieved for each user pair if the buffer size is not less than three, which is larger than conventional nonbuffer-aided C-NOMA schemes whose diversity order is only two in the considered C-NOMA system in the IoT.
AB - The high spectrum efficiency of nonorthogonal multiple access (NOMA) is attractive to solve the massive number of connections in the Internet of Things (IoT). This article investigates a buffer-aided cooperative NOMA (C-NOMA) system in the IoT, where the intended users are equipped with buffers for cooperation. The direct transmission from the access point to the users and the buffer-aided cooperative transmission between the intended users are coordinated. In particular, a novel buffer-aided C-NOMA scheme is proposed to adaptively select a direct or cooperative transmission mode, based on the instantaneous channel state information and the buffer state. Then, the performance of the proposed scheme, in terms of the system outage probability and average delay, is theoretically derived with closed-form expressions. Furthermore, the full diversity order of three is demonstrated to be achieved for each user pair if the buffer size is not less than three, which is larger than conventional nonbuffer-aided C-NOMA schemes whose diversity order is only two in the considered C-NOMA system in the IoT.
KW - Average delay
KW - buffer-aided cooperation
KW - cooperative nonorthogonal multiple access (C-NOMA)
KW - diversity order
KW - outage probability
UR - http://www.scopus.com/inward/record.url?scp=85097965116&partnerID=8YFLogxK
U2 - 10.1109/JIOT.2020.3042505
DO - 10.1109/JIOT.2020.3042505
M3 - Article
AN - SCOPUS:85097965116
SN - 2327-4662
VL - 8
SP - 8145
EP - 8158
JO - IEEE Internet of Things Journal
JF - IEEE Internet of Things Journal
IS - 10
M1 - 9281119
ER -