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A novel type of ultra-thin polarization conversion metasurface (PCM) that reduce radar cross section(RCS) for planar structure is presented. The proposed PCM is consist of split-ring resonators. By the design with mirror-arrangement of the PCM unit cell, a strong phase cancellation is achieved. The simulation results show that the proposed PCM can realize 5 dB RCS reduction in wide range from 8.6GHz...
In this letter, a novel ultra-thin polarization conversion metasurface (PCM) that efficiently rotates linear polarization of electromagnetic waves is presented. The proposed PCM is consist of fish-bone shaped resonators. By the design with five resonances of the PCM unit cell, an ultra-wideband cross-polarization reflection is achieved. The simulation results show that the proposed PCM can realize...
The reradiation interference protection of UHV power transmission line is the key issue of the current Chinese UHV field of electromagnetic compatibility, however solving the problem of traditional transmission lines interference protection is limited to the MoM, so it can't resolve the VHF (30–300 MHz) wide-band electromagnetic scattering field sweep calculation. This paper introduces the MBPE technique,...
Cooperative cognitive radio (CR) improves quality of service (e.g. rate) of primary users by cooperative transmission from secondary uses. However, as owners of the spectrum, primary users' traffic demands are relatively easy to be satisfied. The rationale is that they would be more interested in the benefits of other format (e.g. revenue), instead of the enhanced rate. In this paper, we propose a...
In this paper, differential modulation (DM) schemes, including single differential and double differential, are proposed for amplify-and-forward two-way relaying (TWR) networks with unknown channel state information (CSI) and carrier frequency offsets. Most existing work in TWR assumes perfect channel knowledge at all nodes and no carrier offsets. However, accurate CSI can be difficult to obtain for...
Monitoring and management of modern telecommunication networks has become more and more challenging due to the explosion in scale of data generated by network elements. Not only has the size of the network, the number of nodes, and the number of customers increased, but the amount and dimensionality of the data coming from each managed element has also increased. To support sophisticated monitoring...
Signal detection for an asynchronous 4-relay-node cooperative cellular system using Distributed Space-Time Coding (DSTBC) on the uplink is investigated in this paper, where co-channel interference (CCI) limits the system capacity more than thermal noise and inter-symbol-interference (ISI) caused by the imperfectly synchronized cooperating relays greatly degrades the system performance. Most research...
In this paper, a MMSE based signal detector with interference cancellation (MMSE-IC) is proposed for a two-way relay channel using the decode-and-forward strategy, including two single-antenna source nodes and a multiple-antenna relay node. It is demonstrated that by using the proposed MMSE-IC detector, the BER at the relay when extracting the information of the two source nodes in the multiple-access...
A parallel interference cancellation (PIC) based signal detection scheme is proposed for asynchronous bidirectional relay networks using analog network coding (ANC) with differential modulation. It is shown that the proposed scheme can effectively suppress the inter-symbol interference (ISI) in the received mixed signals at the relay node in the first transmission time-slot and offers significant...
A signal detection technique using successive interference cancellation (SIC) for uplink cooperative cellular systems is proposed in this paper, to suppress the interference caused by the cooperative transmission of two mobile users transmitting both their own information and the cooperative partner's information using distributed space-time coding (DSTC). Simulation results show that the proposed...
Capacity of a cellular system on the downlink is significantly limited by inter-cell interference (ICI), especially at the cell boundary. Multicell joint processing can mitigate inter-cell interference and thereby increase the spectral efficiency of cellular systems. In this paper, a joint distributed space-time coding (J-DSTC) and an inner J-DSTC base station cooperation scheme with precoding are...
Joint parallel interference cancellation (PIC) detection and power control scheme for multi-antenna systems is proposed in this paper. At the receiver, the Minimum Mean-Squared Error (MMSE) detector is utilized in the first stage, and its output is used to reconstruct the interference between antennas. Power control methods are proposed to help with the interference reconstruction at the receiver...
This paper investigates the power allocation between channels in a cognitive wireless network, using the spectrum underlay strategy where the primary users (PUs) and the cognitive users (CUs) coexist and operate in the same spectrum. We propose power allocation schemes to maximize the capacity of the overall system under the constraint that the interference to the PUs due to the CUs will not exceed...
This paper investigates the interference cancellation for a cognitive radio based CDMA system, and the object is to reduce the interference both to the primary and the cognitive users. We propose a beamforming scheme in which the cognitive users operate in the licensed band without causing any interference to the primary user, while employing the interference cancellation technology at the receive...
Cooperative communication improves the QoE of source user by using relay user to retransmit its information to the destination. As a result, the improvement of QoE in source user is at the price of decaying the QoE in relay user. However, the QoE of relay user has been concerned little so far. In this paper, a new power control scheme to improve QoE of relay user in cooperative system has been proposed...
In this paper, a new signal detection scheme using both parallel interference cancellation (PIC) and equalization for the efficient joint distributed space-time coding is proposed to suppress the impact of imperfect synchronisation in distributed cellular systems. Simulation results show that the proposed scheme outperforms the existing joint DSTBC decoded scheme in terms of BER. And also it achieves...
In this paper, an asynchronous cooperative cellular system is investigated on the uplink. We propose a signal detector which involves successive interference cancellation (SIC) and parallel interference cancellation (PIC) to suppress the impact of interference caused by co-channel users and imperfect synchronisation. Simulation results show that the proposed scheme provides significant performance...
In this paper, we study the joint optimization problem on channel coding, power allocation, and route planning in wireless sensor networks (WSN) using dynamic programming (DP). Each sensor node has multiple antennas and applies orthogonal space time block codes (OSTBC) in order to improve the transmission reliability. A decode-and-forward protocol is adopted to relay the signals. The objective function...
This paper proposed a cooperative spectrum sharing game method applied to multi-cells cognitive radio system. The method is based on Nash Bargaining Solution (NBS) which can provide both efficient and fair resource sharing results. Path Gain Ratio (PGR) strategy has been applied to the multi-cells system as spectrum etiquette for user-pair selection. Simulation results have shown that the method given...
In this paper, we propose a successive interference cancellation technique to suppress the co-channel interference (CCI) in space-time block coded cellular systems, since the co-channel interference limits the system capacity more than thermal noise. Simulation results show that the proposed scheme could effectively remove the impact of CCI and significantly improve the system performance with low...
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