A compact dual‐functional component for spatial diversity and multiplexing applications

2021 ◽  
Author(s):  
Li Sun ◽  
Shi‐gang Zhou ◽  
Guan‐xi Zhang ◽  
Bao‐hua Sun
Keyword(s):  
Spatial Diversity ◽  
Functional Component ◽  
Dual Functional

Gelatin-based hydrogels with β-cyclodextrin as a dual functional component for enhanced drug loading and controlled release

RSC Advances ◽  
2013 ◽  
Vol 3 (47) ◽  
pp. 25041 ◽  
Author(s):  
Chengde Liu ◽  
Zhongxing Zhang ◽  
Xiao Liu ◽  
Xiping Ni ◽  
Jun Li
Keyword(s):  
Controlled Release ◽  
Drug Loading ◽  
Functional Component ◽  
Dual Functional

scholarly journals A Receiver Architecture For Dual-Functional Massive MIMO OFDM RadCom Systems

2020 ◽  
Author(s):  
Murat Temiz ◽  
Emad Alsusa ◽  
Laith Danoon
Keyword(s):  
Antenna Arrays ◽  
Interference Cancellation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Large Scale ◽  
Spatial Diversity ◽  
Base Stations ◽  
Communication Signals ◽  
Dual Functional ◽  
Receiver Architecture ◽  
Radar Signals

This study introduces a receiver architecture for dual-functional communication and radar (RadCom) base-stations (BS), which exploits the spatial diversity between the received radar and communication signals, and performs interference cancellation (IC) to successfully separate these signals. In the RadCom system under consideration, both communication and radar systems employ orthogonal frequency-division multiplexing (OFDM) waveforms with overlapping subcarriers. Employing OFDM waveform allows the BS to simultaneously perform uplink channel estimation on the narrow-band subcarriers to efficiently obtain full channel state information (CSI) between the users (UEs) and the BS antenna elements. The estimated CSI matrix is then utilized to acquire uplink data streams from the UEs by suppressing the inter-user interference and radar signals which arrive at the BS through unknown channels. After acquiring the UEs' data, radar signals are extracted from the received complex baseband signals by performing interference cancellation. The proposed method has been analyzed mathematically and verified by simulations under various conditions including CSI mismatch and high radar interference. The results show that 16QAM modulated uplink is outstandingly robust against radar interference and that having a large number of antennas significantly improves the performance of both communication and radar subsystems, cooperatively. This study shows that it is possible to distinguish radar and communication signals by employing large-scale antenna arrays to successfully realize a RadCom receiver for future communication networks

scholarly journals A Receiver Architecture For Dual-Functional Massive MIMO OFDM RadCom Systems

2020 ◽  
Author(s):  
Murat Temiz ◽  
Emad Alsusa ◽  
Laith Danoon
Keyword(s):  
Antenna Arrays ◽  
Interference Cancellation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Large Scale ◽  
Spatial Diversity ◽  
Base Stations ◽  
Communication Signals ◽  
Dual Functional ◽  
Receiver Architecture ◽  
Radar Signals

This study introduces a receiver architecture for dual-functional communication and radar (RadCom) base-stations (BS), which exploits the spatial diversity between the received radar and communication signals, and performs interference cancellation (IC) to successfully separate these signals. In the RadCom system under consideration, both communication and radar systems employ orthogonal frequency-division multiplexing (OFDM) waveforms with overlapping subcarriers. Employing OFDM waveform allows the BS to simultaneously perform uplink channel estimation on the narrow-band subcarriers to efficiently obtain full channel state information (CSI) between the users (UEs) and the BS antenna elements. The estimated CSI matrix is then utilized to acquire uplink data streams from the UEs by suppressing the inter-user interference and radar signals which arrive at the BS through unknown channels. After acquiring the UEs' data, radar signals are extracted from the received complex baseband signals by performing interference cancellation. The proposed method has been analyzed mathematically and verified by simulations under various conditions including CSI mismatch and high radar interference. The results show that 16QAM modulated uplink is outstandingly robust against radar interference and that having a large number of antennas significantly improves the performance of both communication and radar subsystems, cooperatively. This study shows that it is possible to distinguish radar and communication signals by employing large-scale antenna arrays to successfully realize a RadCom receiver for future communication networks

Dual-Function, Light Switchable Cobalt Catalysis via Active Site Metamorphosis

2019 ◽  
Author(s):  
Enrico Bergamaschi ◽  
Frédéric Beltran ◽  
Christopher Teskey
Keyword(s):  
Visible Light ◽  
Active Site ◽  
Catalytic Site ◽  
Dual Function ◽  
Catalytic Systems ◽  
Hydride Complex ◽  
Dual Functional ◽  
Multiple Processes ◽  
Olefin Migration

<p></p><p></p><p>Switchable catalysis offers opportunities to control the rate or selectivity of a reaction <i>via</i> a stimulus such as pH or light. However, few examples of switchable catalytic systems that can facilitate multiple processes exist. Here we report a rare example of such dual-functional, switchable catalysis. Featuring an easily prepared, bench-stable cobalt(I) hydride complex in conjunction with pinacolborane, we can completely alter the reaction outcome between two widely employed transformations – olefin migration and hydroboration – with visible light as the sole trigger. This dichotomy arises from ligand photodissociation which leads to metamorphosis of the active catalytic site, resulting in divergent mechanistic pathways.</p><p></p><p></p>

Dual Functional Interactions of Substance P and Opioids in Nociceptive Transmission: Review and Reconciliation

Analgesia ◽  
1998 ◽  
Vol 3 (4) ◽  
pp. 259-268 ◽  
Author(s):  
Iwona Maszczynska ◽  
Andrzej W. Lipkowski ◽  
Daniel B. Carr ◽  
Richard M. Kream
Keyword(s):  
Substance P ◽  
Nociceptive Transmission ◽  
Functional Interactions ◽  
Dual Functional

MIMO Systems in a Composite Fading and Generalized Noise Scenario: A Review

2020 ◽  
Vol 14 ◽  
Author(s):  
Keerti Tiwari
Keyword(s):  
System Performance ◽  
Performance Enhancement ◽  
Channel Model ◽  
Mimo Systems ◽  
Mimo System ◽  
Spatial Diversity ◽  
Spatial Multiplexing ◽  
Channel Models ◽  
Efficient System ◽  
Composite Channel

: Multiple-input multiple-output (MIMO) systems have been endorsed to enable future wireless communication requirements. The efficient system designing appeals an appropriate channel model, that considers all the dominating effects of wireless environment. Therefore, some complex or less analytically acquiescent composite channel models have been proposed typically for single-input single-output (SISO) systems. These models are explicitly employed for mobile applications, though, we need a specific study of a model for MIMO system which can deal with radar clutters and different indoor/outdoor and mobile communication environments. Subsequently, the performance enhancement of MIMO system is also required in such scenario. The system performance enhancement can be examined by low error rate and high capacity using spatial diversity and spatial multiplexing respectively. Furthermore, for a more feasible and practical system modeling, we require a generalized noise model along with a composite channel model. Thus, all the patents related to MIMO channel models are revised to achieve the near optimal system performance in real world scenario. This review paper offers the methods to improve MIMO system performance in less and severe fading as well as shadowing environment and focused on a composite Weibull-gamma fading model. The development is the collective effects of selecting the appropriate channel models, spatial multiplexing/detection and spatial diversity techniques both at the transmitter and the receivers in the presence of arbitrary noise.

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