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There are 38 papers published in subject: > since this site started. |
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1. Design a multiple platform RFID tag antenna | |||
WEI Senlin | |||
Electrics, Communication and Autocontrol Technology 08 March 2023 | |||
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Abstract:With the development of Radio Frequency Identification (RFID), it has been widely used in many fields, such as transportation, shopping malls and logistics. Among them, RFID tag antenna is an important part of this technology, and the performance of tag antenna is also concerned by more and more people. It has been noticed that different working environments have a great impact on the performance of tags. Especially on the metal surface, because the metal will reflect a lot of electromagnetic waves, the performance of ordinary tag antenna may deteriorate dramatically, resulting in the inability to effectively read information. The goal of this project is to design a RFID tag antenna suitable for free space and metal surface and test its performance. An RFID tag is designed for ultra-high frequency band (902MHz-928MHz) in North America. The tag antenna is based on the structure of micro strip antenna. The tag antenna model is designed and simulated by using three-dimensional electromagnetic simulation software. The whole model consists of surface metal patch, medium substrate and metal floor at the bottom. In terms of bandwidth, a vertical H-slot method is used to cut the current path of the original patch to form multiple resonant modes, which expands the bandwidth of the antenna. The impedance of Impinj\'s Monza-4 chip is 11-143j at 915MHz. After testing, the echo loss of the tag antenna S11 is less than - 10dB in the range of 902MHz-928MHz. The gain of this antenna is also good. After the simulation and optimization process, the tag antenna is fabricated, the antenna object is made and the reading distance of the antenna is measured in free space and metal surface. | |||
TO cite this article:WEI Senlin. Design a multiple platform RFID tag antenna[OL].[ 8 March 2023] http://en.paper.edu.cn/en_releasepaper/content/4759031 |
2. Road Side Unit assisted Opportunistic Offloading in Vehicular Delay-Tolerant Networks: A Data-driven perspective | |||
Wang Tianyu,Wang Chaowei | |||
Electrics, Communication and Autocontrol Technology 22 March 2022 | |||
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Abstract:Vehicular Delay-Tolerant Networks (VDTNs) encounter a great challenge with mobile data traffic, due to vehicles\' high mobility and complex wireless environment. Based on high-throughput mmWave communication, the roadside unit (RSU) plays a significant role in offloading the vehicle\'s data from cellular infrastructure to adjacent RSU. This paper formulate the selection of number and locations to deploy RSU in urban area as an optimization problem. A data-driven RSU deployment algorithm is proposed to maximize RSU utilization and reduce service waiting time. Real trajectory dataset is adopted to evaluate the proposed algorithm. The results show that the proposed algorithm reduces the average service waiting time and achieves a higher RSU utilization. | |||
TO cite this article:Wang Tianyu,Wang Chaowei. Road Side Unit assisted Opportunistic Offloading in Vehicular Delay-Tolerant Networks: A Data-driven perspective[OL].[22 March 2022] http://en.paper.edu.cn/en_releasepaper/content/4757113 |
3. Parameters optimized kernel fuzzy C-means clustering algorithm for WIFI indoor localization | |||
LI Chunyue,WANG Xiang,ZHAO Chenglin,LU Yang,AN Chunyan | |||
Electrics, Communication and Autocontrol Technology 16 May 2017 | |||
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Abstract:Kernel fuzzy C-means(KFCM) algorithm is proposed to manage fingerprint database (also known as radio map) collected from WiFi indoor positioning system. Clustering method greatly reduces the calculation load of position match process. By setting the cluster amount k before initialization, after constant iteration of cluster centers' renewal as well as membership' update until the objective function is minimized or reaches the preset conditions, the database is fuzzily divided into k clusters with k representative centers. With the purpose of obtaining superior clustering performance and better localization precision, this paper proposed several improvements. First, choose optimal interval of reference points(RP) and the amount of access point(AP) to build fingerprint database in order to enhance positioning precision; second, deduce an applicable cluster amount based on the structure characteristics of fingerprint database using sample density method; third, by approximating actual kernel matrix to a hypothetical ideal kernel matrix derives to a kernel parameter that is more appropriate for the radio map. Assessment criteria VXB is proposed to verify the effectiveness of kernel parameter's optimization based on Iris dataset. By means of the parameters adjustment above, the clustering result is more suitable for the selected datasets, and the last two improvements lead to 19.5% and 23.55% improvement in localization accuracy. | |||
TO cite this article:LI Chunyue,WANG Xiang,ZHAO Chenglin, et al. Parameters optimized kernel fuzzy C-means clustering algorithm for WIFI indoor localization[OL].[16 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4731645 |
4. OFDM subcarrier Interval Determination Scheme for Resisting Doppler Shift in LEO Satellite System | |||
Sun Chunhui,Liu Lupeng,Zhang Yinghai | |||
Electrics, Communication and Autocontrol Technology 16 November 2016 | |||
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Abstract:Due to the dynamic relative motion of the mobile station and the satellite, the signal is affected by varied frequency offset, resulting in a worse performance, such as a higher bit error rate (BER) in the low earth orbit (LEO) satellite communication system. Considering that a mobile station is usually covered by several LEO satellites., this paper presents a novel scheme on adjusting OFDM subcarrier interval, which would properly make use of multiple link signals to achieve a maximum user capacity. What's more, BER would be controlled at a reasonable threshold value by eliminating the inter carrier interference (ICI). The signal to interference plus noise ratio (SINR) of the received signal is analyzed theoretically, and the formula of BER as well as user capacity is derived out according to the very circumstance. And simulation is presented to demonstrate that the proposed scheme achieves a much larger user capacity by searching for the optimum subcarrier interval. | |||
TO cite this article:Sun Chunhui,Liu Lupeng,Zhang Yinghai. OFDM subcarrier Interval Determination Scheme for Resisting Doppler Shift in LEO Satellite System[OL].[16 November 2016] http://en.paper.edu.cn/en_releasepaper/content/4710312 |
5. Delay Optimization of Peer Discovery in Vehicle Networking | |||
LIU Yang, LIU Pei-Zhi | |||
Electrics, Communication and Autocontrol Technology 17 October 2016 | |||
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Abstract:Long Term Evolution-Advanced (LTE-A) technology provides a good support for vehicle networking communication because its high speed, large capacity, low delay and other characteristics. But for the highway, which is sensitive to delay,the periodic transmission of the beacon in the LTE-A system leads to an intolerable delay. To optimize the delay, this paper improve a distributed peer discovery protocol. The proposed protocol requires vehicles to advertise their presence, and Evolved NodeB (eNB) divides them into clusters following a certain rule, which we called peer discovery. In order to minimize delay occupancy, vehicles in different groups broadcast their information on the same slot. Our numerical analysis indicates that under the same discovery probability, the delay is reduced by 60%. | |||
TO cite this article:LIU Yang, LIU Pei-Zhi. Delay Optimization of Peer Discovery in Vehicle Networking[OL].[17 October 2016] http://en.paper.edu.cn/en_releasepaper/content/4707309 |
6. Performance Analysis of Free-Space Optical Communications Link Using Multiplexing Orbital Angular Momentum States | |||
SANG Hongqing,YIN Xiaoli,HAO Ji,GUO Xinglan,YANG Xuan | |||
Electrics, Communication and Autocontrol Technology 04 December 2015 | |||
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Abstract:Performance of free-space optics (FSO) link using multiplexing orbital angular momentum (OAM) states over non-Kolmogorov turbulent model is investigated in this paper. The probability of keeping the original OAM state after passing through the atmosphere turbulence has been estimated by the numerical analysis. We show that the detection probability of the original OAM state varies along with the topological charge of the transmitted OAM state, the aggregate capacity and per-channel bit-error rate are investigated to verify the influence imposed by the turbulence of the multi-OAM system. | |||
TO cite this article:SANG Hongqing,YIN Xiaoli,HAO Ji, et al. Performance Analysis of Free-Space Optical Communications Link Using Multiplexing Orbital Angular Momentum States[OL].[ 4 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4668245 |
7. An adaptive MU/MS-MIMO detector for uplink CoMP and its FPGA implementation | |||
DONG Yue,ZHANG Kangle | |||
Electrics, Communication and Autocontrol Technology 10 November 2015 | |||
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Abstract:CoMP is a promising technique in future wireless communication systems. But there have been few works focused on the implementation of CoMP detector. A novel architecture of adaptive MU/MS-MIMO detector is proposed in this letter. Based on this, an MU/MS-MIMO detector is implemented in FPGA, which is validated in a cooperative communication trial system. Results show that, the detector can work with high throughput in CoMP uplink and performs well in both single-user and multiuser scenarios. | |||
TO cite this article:DONG Yue,ZHANG Kangle. An adaptive MU/MS-MIMO detector for uplink CoMP and its FPGA implementation[OL].[10 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4660915 |
8. Interference Mitigation Technique for CR-MIMO System | |||
RI Jangchol,WANG Yafeng | |||
Electrics, Communication and Autocontrol Technology 04 January 2015 | |||
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Abstract:In this paper; we investigate a new interference mitigation technique to reduce the interference of the primary user caused by the secondary user in CR-MIMO-OFDM systems. More specifically, the interference first is reduced by rough adjustment of the AIC technique and then it is further reduced by fine adjustment of the phase rotation technique. The simulation results show that the proposed interference technique approximately can decrease the interference of the primary user up to 3dB with the same complexity, compared to the conventional AIC technique, for flat fading channels.????? | |||
TO cite this article:RI Jangchol,WANG Yafeng. Interference Mitigation Technique for CR-MIMO System[OL].[ 4 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4626742 |
9. Randomized space-time block coding for cooperative HF communication | |||
Dong Hao,Tang Bihua | |||
Electrics, Communication and Autocontrol Technology 26 December 2013 | |||
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Abstract:This paper propose a novel scheme that increases the range and throughput in High Frequency (HF) communications using physical layer node cooperation. By exploiting multiple (and sufficiently spatial separated) power-constrained portable radios in a collaborative structure, it will be possible to obtain diversity gains similar to Multiple Input Multiple Output (MIMO) systems and therefore, to maximize link reliability, to increase communication range for a given throughput and power or, to increase throughput for a given range and power. This scheme is based on randomized space-time block coding (STBC) in the framework of distributed cooperative networks. In this paper, a short block Time-Reversal Space-Time Block Coding scheme (TR-STBC) combined with orthogonal frequency division multiplexing (OFDM) is presented to eliminate the doubly-selective fading of HF channel and, furthermore is compared though simulation to show the best performance among the three schemes we present. It's also observed that the diversity can be obtained by increasing the number of nodes. The proposed architecture will provide diversity gains that will improve the reliability of HF transmission with limited supporting infrastructure. | |||
TO cite this article:Dong Hao,Tang Bihua. Randomized space-time block coding for cooperative HF communication[OL].[26 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4578679 |
10. A high estimated accuracy Random Access Preamble Detection Algorithm for FDD-LTE System | |||
PENG Feilong,WANG Weidong | |||
Electrics, Communication and Autocontrol Technology 02 December 2013 | |||
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Abstract:In long term evolution (LTE) uplink transmission, a User Equipment (UE) must be time-synchronized before normal data transmission. So that the Physical Random Access Channel (PRACH) becomes a crucial factor for LTE access scheme. The main role of PRACH is to detect the random access signal and estimating the Timing Advance (TA), namely the transmission delay. The former has gained many discussions, but the latter was seldom touched. However, through a Systematical theoretical analysis, we can find that the estimate results of the current preamble detection algorithms can not reflect the accurate transmission delay, even we do not consider the noise and interferences. This paper proposes a novel preamble detection algorithm which has high accuracy of TA estimation and low computational complexity. | |||
TO cite this article:PENG Feilong,WANG Weidong. A high estimated accuracy Random Access Preamble Detection Algorithm for FDD-LTE System[OL].[ 2 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4569219 |
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