In this paper high isolation dual-polarized Dielectric Resonator Antenna (DRA) for multiple-input multiple-output (MIMO) Long Term Evolution (LTE) applications is designed and fabricated. High isolation more than 50 d...
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ISBN:
(纸本)9781538653982
In this paper high isolation dual-polarized Dielectric Resonator Antenna (DRA) for multiple-input multiple-output (MIMO) Long Term Evolution (LTE) applications is designed and fabricated. High isolation more than 50 dB is achieved through Quasi-orthogonal modes at 2.6 GHz with hybrid feeding mechanism. Port 1 and port 2 excite TEX and TEY modes through microstrip feed line and coaxial probe, respectively. The proposed design is analyzed for distinct ground planes which demonstrate negligible effect on gain and S-parameters. Simulated and measured results reveal that the proposed design is appropriate for MIMO LTE terminals.
multiple-input multiple-output (MIMO) technique is expected to be extensively used in future wireless systems to increase capacity of wireless channels. Nevertheless, the capacity gain comes with a cost. In particular...
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ISBN:
(纸本)9789082797039
multiple-input multiple-output (MIMO) technique is expected to be extensively used in future wireless systems to increase capacity of wireless channels. Nevertheless, the capacity gain comes with a cost. In particular, multiple analog radio frequency (RF) chains are required at both the transmitter and the receiver, thereby leading to a higher implementation cost, more power consumption, and lower energy efficiency. This paper presents a receiver with only one RF chain for 2x2 MIMO transmission system. Proposed design is based on a time modulated antenna array (TMAA) with beam-steering functionality and a wideband software defined radio (SDR). Spatial streams were created by demultiplexing spectral components (sidebands) generated by periodical ON/OFF switching Number of RF chains was reduced from 2 to 1 while maintaining sufficiently low correlation of spatial streams, which is required to perform MIMO transmission. Feasibility of proposed technique is evaluated by means of experimental verification.
This paper analyzes the performance of multi-user multiple-input multiple-output (MU-MIMO) systems, with a finite phase-shift keying (PSK) input alphabet. The achievable sum rate is investigated for two precoding tech...
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ISBN:
(纸本)9781538676462
This paper analyzes the performance of multi-user multiple-input multiple-output (MU-MIMO) systems, with a finite phase-shift keying (PSK) input alphabet. The achievable sum rate is investigated for two precoding techniques, namely: 1) zero forcing (ZF) precoding, 2) constructive interference (CI) precoding. In light of this, new analytical expressions for the average sum rate are derived in the two scenarios, and Monte Carlo simulations are provided throughout to confirm the analysis. Furthermore, based on the derived expressions, a power allocation scheme that can ensure fairness among the users is also investigated. The results in this paper demonstrate that, the CI strictly outperforms the ZF scheme, and the performance gap between the considered schemes depends essentially on the system parameters.
We demonstrate wavelength-division multiplexed (WDM) and mode-division multiplexed (MDM) transmission over a fiber recirculating loop comprising of a 25-km span of low differential mode group dispersion (DMGD) few-mod...
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ISBN:
(纸本)9780819494160
We demonstrate wavelength-division multiplexed (WDM) and mode-division multiplexed (MDM) transmission over a fiber recirculating loop comprising of a 25-km span of low differential mode group dispersion (DMGD) few-mode fiber carrying the LP01 and LP11 mode groups, and an inline few-mode erbium-doped fiber amplifier (FM-EDFA) providing low mode-dependent gain (MDG) per span. We successfully transmitted a 10 lambda x 6 x 28-Gbaud QPSK signal over a distance of 700 km.
In this paper, we analyze the performance of two sub-optimal antenna selection strategies for single relay based selective decode-and-forward (DF) cooperative multiple-input multiple-output (MIMO) systems. We assume t...
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ISBN:
(纸本)9781479923618
In this paper, we analyze the performance of two sub-optimal antenna selection strategies for single relay based selective decode-and-forward (DF) cooperative multiple-input multiple-output (MIMO) systems. We assume that the source-relay, relay-destination, and the source-destination channels follow the Rayleigh fading. We derive the closed-form expressions and the upper bounds of the symbol error rate (SER) for selective DF cooperative MIMO systems employing M-ary phase shift keying in both the antenna selection strategies. From the derived SER upper bounds, we extract the diversity orders of the system in both the selection strategies. The optimal power allocation for the source and relay is derived in both the selection strategies, which minimize the SER of DF cooperative MIMO system.
In this paper, an advanced wireless mobile collaborative sensing network will be developed. Through properly combining wireless sensor network, emerging mobile robots and multi-antenna sensing/communication techniques...
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ISBN:
(数字)9781510608702
ISBN:
(纸本)9781510608696;9781510608702
In this paper, an advanced wireless mobile collaborative sensing network will be developed. Through properly combining wireless sensor network, emerging mobile robots and multi-antenna sensing/communication techniques, we could demonstrate superiority of developed sensing network. To be concrete, heterogeneous mobile robots including unmanned aerial vehicle (UAV) and unmanned ground vehicle (UGV) are equipped with multi-model sensors and wireless transceiver antennas. Through real-time collaborative formation control, multiple mobile robots can team the best formation that can provide most accurate sensing results. Also, formatting multiple mobile robots can also construct a multiple-input multiple-output (MIMO) communication system that can provide a reliable and high performance communication network.
Space-time block codes (STBCs) from orthogonal designs have attracted considerable attention due to their fast maximum-likelihood (ML) decoding and full diversity. A full rate (R=1) is achieved for 3 and 4 antennas us...
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ISBN:
(纸本)9781479938209
Space-time block codes (STBCs) from orthogonal designs have attracted considerable attention due to their fast maximum-likelihood (ML) decoding and full diversity. A full rate (R=1) is achieved for 3 and 4 antennas using "triple QPSK" for complex (STBCs). This paper proposes a family of new space-time block codes (STBC) for 6 transmit antennas that achieves full rate. This paper also proposes a modified QPSK constellation scheme that can achieve the full rate for both 6 and 8 transmit antennas.
Urban air mobility (UAM) is a subset of advanced air mobility which is provisioned to reduce traffic congestion in and around urban areas. Unlike traditional transportation, UAM operates in the airspace, which brings ...
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ISBN:
(纸本)9798350304060;9798350304053
Urban air mobility (UAM) is a subset of advanced air mobility which is provisioned to reduce traffic congestion in and around urban areas. Unlike traditional transportation, UAM operates in the airspace, which brings safety issues. Thus, ensuring robust, high-rate data transmission is a prime concern to prevent collisions and share information among UAMs. With its wide bandwidth, millimeter wave communications are regarded as a promising solution for feasible air-to-air (A2A) communications for UAMs. To compensate for the large path loss at millimeter wave bands, the use of codebook based multiple-input multiple-output signal processing has been studied due to its quality performance with low complexity. Most of existing codebooks exploit codewords producing beam patterns with equal beamwidth. However, for better communication within the UAM corridor, it is essential to design a codebook which considers the unique topology of the UAM corridor. To deal with this issue, we have developed a codebook customized for A2A communications by exploiting the spatial characteristics of the UAM corridor. Furthermore, we propose a weighting-based beamwidth allocation method, which can enhance the efficiency of data transmission. Simulation results show that the proposed codebook exhibits lower outage probability and higher spectral efficiency than conventional codebooks.
For differential space-time block coding (DSTBC), this paper proposes a simple decision-feedback block differential detection (DFBDD) scheme with small computational complexity, in order to improve tracking capability...
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ISBN:
(纸本)9781479944828
For differential space-time block coding (DSTBC), this paper proposes a simple decision-feedback block differential detection (DFBDD) scheme with small computational complexity, in order to improve tracking capability on fast time-varying fading channels. Decisions can be derived directly without computation of metrics in the proposed DFBDD. It can also employ higher-order channel prediction, which needs neither complex trellis search algorithms nor complex channel prediction recursive algorithms. Finally, computer simulation results confirm that the proposed DFBDD with higher-order channel prediction has higher tracking capability at low computational complexity than the conventional block differential detection without channel prediction.
This research addresses the tracking control problem for a class of multi-input multi-output networked systems characterized by unknown nonlinear functions, mismatched disturbances, event-triggered inputs, and input c...
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ISBN:
(纸本)9798350373707;9798350373691
This research addresses the tracking control problem for a class of multi-input multi-output networked systems characterized by unknown nonlinear functions, mismatched disturbances, event-triggered inputs, and input coupling. A novel prescribed performance control strategy and actuator update protocol are proposed to address this challenge. In contrast to existing results, our approach requires the transmission of a binary signal (0 or 1) to the actuator. This not only reduces the quantity of data transmission but also minimizes the number of transmitted bits, thereby saving communication costs. Furthermore, irrespective of the unknown nonlinearities, disturbances, and measurement errors, the proposed method ensures both transient and steady-state performance in output tracking. Simulation results are provided to validate the established theoretical conclusions.
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