Results 11 to 20 of about 300,149 (134)
IET Communications, 2014 Orthogonal variable spreading factor‐based code division multiple access systems allocate vacant codes when new call(s) arrive. This study proposes a same rate assignment scheme which allocates a new call to most favourable code in the region crowded by same rate calls. This does not add to blocked codes because of previous calls but utilise the unused
Vipin Balyan, Davinder S. Saini
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Optimal Power Allocation for Cooperative Pattern Division Multiple Access Systems
Mathematical Problems in Engineering, 2021 This study focuses on the power allocation (PA) problem in code division multiple access (PDMA) networks with amplify-and-forward (AF) relays. We provide two wireless communication technical performance indexes, which are system throughput and outage probability.
Xiurong Zhang, Shaoli Kang, Xueqian Fu
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Uplink grant‐free pattern division multiple access transmission scheme by exploiting poly complementary sequence [PDF]
Transactions on Emerging Telecommunications Technologies, 2021 AbstractNon‐orthogonal multiple access (NOMA) technology is a key technology of the future cellular mobile communication system. It provides services for users under different channel conditions through signal superposition transmission and spectrum multiplexing.
Li, Shufeng +4 more
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Investigation of pattern division multiple access technique in wireless communication networks
Indonesian Journal of Electrical Engineering and Computer Science, 2022 Recently, <span>pattern division multiple access (PDMA) is a non-orthogonal multiple access system that is now being developed in next-generation telecoms to address the requirement for mass connectivity. The core premise of non-orthogonal multiple access is to simultaneously serve multiple users with varying power levels across the same spectrum
Yonis, Aws Zuheer +1 more
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Pattern division random access (PDRA) scheme for mMIMO systems
Dianxin kexue, 2022 To enhance the massive machine-type communications (mMTC) random access (RA) performance, a pattern division random access (PDRA) scheme was proposed for massive multiple-input multiple-output (mMIMO) systems.In this scheme, the pilot contention space ...
Xiaoming DAI +5 more
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New multiple access and waveform technology for 6G
Dianxin kexue, 2022 With the explosive growth of Internet devices, the 5G new radio (NR) system faces congestion and high latency issues due to the low access efficiency of traditional orthogonal multiple access (OMA).Besides this, the performance of the orthogonal ...
Hua LI +4 more
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Research on PDMA communication system based on complete complementary sequence
EURASIP Journal on Wireless Communications and Networking, 2020 Pattern division multiple access (PDMA) is a new non-orthogonal multiple access (NOMA) technology. It is proposed to meet the challenge of 5G large-scale connectivity and high-frequency spectral efficiency.
Shufeng Li, Baoxin Su, Libiao Jin
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Construction of nested pattern matrix with large girth for PDMA systems
Electronics Letters, 2021 In this letter, a new method is proposed to construct the pattern matrix (PM) with both nested structure and large girth for pattern division multiple access (PDMA) system. The proposed method contains two steps.
Qingqing Liu, Jin Xu
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Electronics Letters, 2022 In this letter, a fixed‐latency interleaver architecture is proposed for interleave division multiple access (IDMA) systems. The existing multi‐stage algebraic interleaver suffers from the high latency originated from a series of multipliers and adders ...
Byeong Yong Kong
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DDMA MIMO radar system for low, slow, and small target detection
The Journal of Engineering, 2019 The low, slow, and small (LSS) target detection has always been a problem for both ground-based and air-borne radar systems. The factors such as weak target reflection energy, ground clutter, and random Doppler component will have a severe impact on ...
Fawei Yang +3 more
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