Comparison of multiple-input single-output single-user ultra-wideband systems with pre-distortion

2011 ◽  
pp. n/a-n/a
Author(s):  
B.A. Angélico ◽  
P.J.E. Jeszensky ◽  
P.M.S. Burt ◽  
W.S. Hodgkiss ◽  
T. Abrão
Keyword(s):  
Ultra Wideband ◽  
Single Output ◽  
Multiple Input ◽  
Single User ◽  
Wideband Systems

scholarly journals Random Beam-Based Non-Orthogonal Multiple Access for Low Latency K-User MISO Broadcast Channels

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4373
Author(s):  
Jung Hoon Lee ◽  
Yunjoo Kim ◽  
Jong Yeol Ryu
Keyword(s):  
Multiple Access ◽  
Broadcast Channels ◽  
Low Latency ◽  
Noise Power ◽  
User Grouping ◽  
Single Antenna ◽  
Single Output ◽  
Multiple Input ◽  
Single User ◽  
Random Beamforming

In this paper, we propose random beam-based non-orthogonal multiple access (NOMA) for low latency multiple-input single-output (MISO) broadcast channels, where there is a target signal-to-interference-plus-noise power ratio (SINR) for each user. In our system model, there is a multi-antenna transmitter with its own single antenna users, and the transmitter selects and serves some of them. For low latency, the transmitter exploits random beams, which can reduce the feedback overhead for the channel acquisition, and each beam can support more than a single user with NOMA. In our proposed random beam-based NOMA, each user feeds a selected beam index, the corresponding SINR, and the channel gain, so it feeds one more scalar value compared to the conventional random beamforming. By allocating the same powers across the beams, the transmitter independently selects NOMA users for each beam, so it can also reduce the computational complexity. We optimize our proposed scheme finding the optimal user grouping and the optimal power allocation. The numerical results show that our proposed scheme outperforms the conventional random beamforming by supporting more users for each beam.

scholarly journals Energy Consumption Models For MISO-UWB and TR-MISO-UWB Systems

2017 ◽  
Vol 63 (3) ◽  
pp. 285-291
Author(s):  
Adil El Abboubi ◽  
Fouzia Elbahhar ◽  
Marc Heddebaut ◽  
Yassin Elhillali
Keyword(s):  
Energy Consumption ◽  
Channel Model ◽  
Electrical Energy ◽  
Ultra Wideband ◽  
Electrical Energy Consumption ◽  
Single Output ◽  
Energy Consumption Model ◽  
Multiple Input ◽  
Single Input ◽  
The One

Abstractthis paper, an energy consumption model is developed and exploited to evaluate the electrical energy consumption of ultra-wideband impulse radio (UWB-IR) systems. We develop the energy consumption models and our comparative study, on the one hand, for a system based single-input singleoutput (SISO) configuration and a multiple-input single-output (MISO) and, on the other hand, for a time reversal TR-MISO configuration and for MISO alone configuration. We consider an indoor propagation environment based on the 802.15.4a channel model. The results show very different behaviors depending on the propagation conditions, the number of antennas used, or on the number of transmitted symbols. Using such a model, a radiofrequency designer can obtain significant inputs to optimally select an adequate configuration to design an adaptive energyaware UWB-IR system.

Cuboidal quad-port UWB-MIMO antenna with WLAN rejection using spiral EBG structures

2021 ◽  
pp. 1-8
Author(s):  
Sumon Modak ◽  
Taimoor Khan
Keyword(s):  
Close Agreement ◽  
Ground Plane ◽  
Antenna System ◽  
Ultra Wideband ◽  
Electromagnetic Bandgap ◽  
Mimo Antenna ◽  
Simulated Performance ◽  
Notched Band ◽  
Multiple Input ◽  
Band Characteristic

Abstract This study presents a novel configuration of a cuboidal quad-port ultra-wideband multiple-input and multiple-output antenna with WLAN rejection characteristics. The designed antenna consists of four F-shaped elements backed by a partial ground plane. A 50 Ω microstrip line is used to feed the proposed structure. The geometry of the suggested antenna exhibits an overall size of 23 × 23 × 19 mm3, and the antenna produces an operational bandwidth of 7.6 GHz (3.1–10.7 GHz). The notched band characteristic at 5.4 GHz is accomplished by loading a pair of spiral electromagnetic bandgap structures over the ground plane. Besides this, other diversity features such as envelope correlation coefficient, and diversity gain are also evaluated. Furthermore, the proposed antenna system provides an isolation of −15 dB without using any decoupling structure. Therefore, to validate the reported design, a prototype is fabricated and characterized. The overall simulated performance is observed in very close agreement with it's measured counterpart.

Uniplanar polarisation diversity antenna for ultra‐wideband systems

2013 ◽  
Vol 7 (10) ◽  
pp. 851-857 ◽  
Author(s):  
Bybi P. Chacko ◽  
Gijo Augustin ◽  
Tayeb A. Denidni
Keyword(s):  
Ultra Wideband ◽  
Wideband Systems ◽  
Diversity Antenna
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