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1. Group TXOP Sharing: MAC Enhancements for CSI Feedback Overhead Amortization and User Selection | |||
LI Zhaoxing,WEN Xiangming,LU Zhaoming | |||
Electrics, Communication and Autocontrol Technology 25 September 2017 | |||
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Abstract:In wireless LANs (WLANs), heavy Channel State Information (CSI) feedback overhead has become a bottleneck in multi-user MIMO (MU-MIMO) transmission efficiency. Moreover, the current MAC protocol, like Quality of Service (QoS) based Transmission Opportunity (TXOP) Sharing, selects users without consideration of channel orthogonality which obviously influence the capacity of MU-MIMO. This results in bad user selection and excessive CSI feedback. This paper addresses these matters by proposing a cross-layer TXOP sharing mechanism, Group TXOP, which produces a Beamforming Group using a channel-based user selection mechanism and changes the TXOP holder from the Access Category (AC) to the Beamforming Group. Group TXOP takes advantage of channel orthogonality in selecting users and meanwhile amortizes the overhead to multiple frames by avoiding per-packet CSI feedback. The simulation results show that the relative overhead of CSI feedback reduces by 15% and the downlink throughput increases by 16% after using Group TXOP. | |||
TO cite this article:LI Zhaoxing,WEN Xiangming,LU Zhaoming. Group TXOP Sharing: MAC Enhancements for CSI Feedback Overhead Amortization and User Selection[OL].[25 September 2017] http://en.paper.edu.cn/en_releasepaper/content/4741587 |
2. The Rate Analysis of NB-IoT Uplink Shared Channel | |||
MA Huifang,ZHANG Jianming | |||
Electrics, Communication and Autocontrol Technology 04 September 2017 | |||
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Abstract:With the internet of thing market growing rapidly, the low rate applications occupy most of the connections of IoT. However, existing network techniques can\'t match them very well. NB-IoT owning wide coverage, low power, low cost, large connection, stands out from many candidates for low rate applications. Based on the analysis of the characteristics of NB-IoT technology, this paper deeply studies the coverage of NB-IoT by combining the features of uplink (UP) / downlink (DL) frame structure, multiplexing method and scheduling unit used by narrowband IoT (NB-IoT). Firstly, the uplink and downlink rate ability were analyzed .Then, according to the rate requirement, the coverage capability, cell capacity and throughput were quantitatively analyzed and suggestions about the NB-IoT network planning were given. | |||
TO cite this article:MA Huifang,ZHANG Jianming. The Rate Analysis of NB-IoT Uplink Shared Channel[OL].[ 4 September 2017] http://en.paper.edu.cn/en_releasepaper/content/4741351 |
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. Availability Analysis of Next Generation CBTC Data Communication Systems | |||
YAO Ding-Yi, ZHU Li | |||
Electrics, Communication and Autocontrol Technology 10 May 2017 | |||
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Abstract:Communication-based train control (CBTC) systems are automated train control systems using wireless communications. Data communication is extremely important in CBTC systems. Train ground communication system which includes too many interfaces between various subsystems and excessive ground equipment is used as traditional CBTC data communication system. In next generation CBTC systems, train-to-train communication is adopted with the advantages of higher-speed, larger-capacity per unit time and the briefer structure in comparison with traditional CBTC system. Although train-to-train communication based CBTC systems has been implemented in urban rail systems. The system availability has not been studied before. In this paper, deterministic and stochastic Petri nets(DSPN) is used for the CBTC system to characterize its normal operation probability. Several typical data communication scenarios are depicted and simulated with DSPN. The impact of different scenario parameters on CBTC system operation is discussed. The availability of the next generation CBTC system is compared with the traditional CBTC system as well. | |||
TO cite this article:YAO Ding-Yi, ZHU Li. Availability Analysis of Next Generation CBTC Data Communication Systems[OL].[10 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4732981 |
5. Handover Performance Test and Analysis in TD-LTE Based CBTC Train Ground Communication Systems | |||
WANG Yi-Ge, ZHU Li | |||
Electrics, Communication and Autocontrol Technology 10 May 2017 | |||
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Abstract:Most of the existing urban rail CBTC train ground communication systems are based on Wireless Local Networks (WLAN) technologies. With frequency interference and the increase of train speed, WLAN is incapable of meeting the requirements of CBTC train ground communication systems. Time Division-Long Term Evolution (TD-LTE) technology begins to be considered in urban rail transit systems. In this paper, we first design a TD-LTE based urban rail CBTC train ground communication systems, the handover procedure and handover requirements according to CBTC system principle are analyzed next. In order to verify swhether the designed TD-LTE based system meet the handover performance demands when trains travel in high speed CBTC systems, a laboratory test environment and a real field test environment are set up. Massive test results show that the handover performance of TD-LTE based urban rail CBTC train ground communication systems meets the demands of urban rail transit systems. | |||
TO cite this article:WANG Yi-Ge, ZHU Li. Handover Performance Test and Analysis in TD-LTE Based CBTC Train Ground Communication Systems[OL].[10 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4732978 |
6. Capacity Analysis and Optimization of Millimeter Wave Cellular Networks with Beam Scanning | |||
XU Rui, FAN Jian-Cun, ZHANG Ying, LUO Xin-Min | |||
Electrics, Communication and Autocontrol Technology 03 May 2017 | |||
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Abstract:Millimeter wave have received more and more attention to meet the remarkable growth of wireless data traffic due to the massive available bandwidths. In this paper, we will analyze and optimize the system performance of emph{millimeter Waves} communication with directional cell discovery based on beam scanning. We first establish the system model with beam scanning and analyze the corresponding system performance considering the relationship between the number of beam scanning and the beamforming gain. Since changing the number of beam scanning,$K$, is corresponding to adjust the cell searching delay, $K$ can be optimized to maximum the system capacity and reduce pilot signal overhead. The simulation and analysis show that there exists an optimal $K$ which not only makes the system capacity maximum but also trade off the cell searching delay and the beam gain. | |||
TO cite this article:XU Rui, FAN Jian-Cun, ZHANG Ying, et al. Capacity Analysis and Optimization of Millimeter Wave Cellular Networks with Beam Scanning[OL].[ 3 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4729092 |
7. Performance Analysis and Optimization of Downlink Cellular Networks with Vertical Sectorization | |||
Zhou Jun-Peng, FAN Jian-Cun, ZHANG Ying, LUO Xin-Min | |||
Electrics, Communication and Autocontrol Technology 03 May 2017 | |||
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Abstract:In this paper, we investigate the vertical sectorization in a downlink cellular network and optimize the identify threshold of vertical sectorization and antenna downtilt of each vertical sector. Firstly, we use gamma distribution to approximate the achievable sum-rates of the cellular networks with vertical sectorization. Then, according to the approximation, we formulate an optimization problem to maximize system throughput and achieve the optimization solution through a simple algorithm. The simulation results show that the system sum-rates can be improved by optimizing the number of vertical sectors, the threshold of vertical sectorization, and the antenna downtilt. | |||
TO cite this article:Zhou Jun-Peng, FAN Jian-Cun, ZHANG Ying, et al. Performance Analysis and Optimization of Downlink Cellular Networks with Vertical Sectorization[OL].[ 3 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4728780 |
8. MLSE Equalizer with Optimized Channel Shortening for FTN Transmission | |||
FAN Jian-Cun, REN Ya-Jie, ZHANG Ying, LUO Xin-Min | |||
Electrics, Communication and Autocontrol Technology 02 May 2017 | |||
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Abstract:Faster-than-Nyquist(FTN) signaling by introducing controlled emph{inter-symbol interference} (ISI) has been viewed as a potential technique in the coming emph{fifth generation} (5G) systems due to its higher spectrum efficiency. In order to achieve the high transmission rate, the effective receivers have to been design to suppress the ISI and extract the transmit signals. Therefore, we propose a channel shortening-based emph{maximum-likelihood sequence equalization} (MLSE) scheme. In this scheme, the length of the shortening channel can be optimized for the different time-squeezing factor, which determines the transmission rate and ISI in FTN systems, to achieve a good tradeoff between the detection performance and the implementation complexity. The simulation analysis results show that the proposed MLSE equalizer with optimized channel shortening can achieve a good tradeoff between the performance and the complexity. | |||
TO cite this article:FAN Jian-Cun, REN Ya-Jie, ZHANG Ying, et al. MLSE Equalizer with Optimized Channel Shortening for FTN Transmission[OL].[ 2 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4727300 |
9. Design of Remote and Low Power Communication Scheme for Wireless Sensor Networks | |||
XU Lei,ZHOU Huajian,LI Xiaohui | |||
Electrics, Communication and Autocontrol Technology 02 May 2017 | |||
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Abstract:Aiming at the problems, such as the midpoint communication distance of the wireless sensor network is short, low power consumption design leads to weak driver ability of sensor, based on Si44332 wireless communication module and AVR microcontroller, the basic platform is established. Combined with the advantages of frequency sub-channel division and low power carrier wake-up, a long distance and low power communication scheme is designed.This sheme solves the problems of the power supply difficulty in the traditional wireless sensor network and the same frequency interference. In order to ensure the sensor driving ability at the same time, this shceme achieves a reliable long-distance data transmission of high spectral efficiency and low power consumption, and has the advantages of flexible structure, strong expansibility, low cost and so on, especially has very strong practicability on a large scale application scene. | |||
TO cite this article:XU Lei,ZHOU Huajian,LI Xiaohui. Design of Remote and Low Power Communication Scheme for Wireless Sensor Networks[OL].[ 2 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4729679 |
10. Inter-Carrier Interference Adaptive Cancellation for MIMO-OFDM Systems in High-Speed Train Environment | |||
FANG Yong,HE Guanmin | |||
Electrics, Communication and Autocontrol Technology 28 April 2017 | |||
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Abstract:For the multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) systems in high-speed train (HST) environment, the inter-carrier interference (ICI) is caused by the non-stationary time-varying channel. In this paper, the adaptive cancellation for ICI is explored on the basis of phase rotated conjugate cancellation (PRCC) scheme. An ICI adaptive cancellation algorithm is proposed by updating the optimal phases per two OFDM symbol periods. The simulation results demonstrate that the proposed algorithm is applicable to mitigate the ICI in HST environment. It can enormously increase the carrier-to-interference ratio (CIR), which is better than the traditional ICI self-cancellation algorithm. The bit error rate (BER) decreases at the rate of 95.4%, 90.0% and 66.7%, comparing to those in standard MIMO-OFDM systems when the train runs at the speed of 300[km/h], 400[km/h] and 500[km/h], respectively. | |||
TO cite this article:FANG Yong,HE Guanmin. Inter-Carrier Interference Adaptive Cancellation for MIMO-OFDM Systems in High-Speed Train Environment[OL].[28 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4730798 |
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