2015 International Conference on Signal Processing and Communication (ICSC)最新文献_第6页

Performance analysis and peak-to-average power ratio reduction of concatenated LDPC coded OFDM system using low complexity PTS 利用低复杂度PTS降低串接LDPC编码OFDM系统的性能分析及峰均功率比

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150646

A. Joshi, D. Saini

{"title":"Performance analysis and peak-to-average power ratio reduction of concatenated LDPC coded OFDM system using low complexity PTS","authors":"A. Joshi, D. Saini","doi":"10.1109/ICSPCOM.2015.7150646","DOIUrl":"https://doi.org/10.1109/ICSPCOM.2015.7150646","url":null,"abstract":"OFDM suffers with two major drawbacks, poor bit error rate (BER) performance in fading environment and high value of peak to average power ratio (PAPR). OFDM system can be combined with channel coding schemes to improve BER in fading environment. Convolution codes, Reed Solomon (RS) and Turbo codes are widely used channel codes, but in recent studies low density parity check codes (LDPC) have outperformed every other code in terms of error correction capabilities. High PAPR increases circuit complexity and reduce RF amplifier efficiency. Partial Transmit Sequence (PTS) is one of the most preferred techniques for PAPR reduction, however in PTS scheme the computation of optimal phase factors necessitates exhaustive searching among all allowable phase factors. This leads to exponential increase in computation complexity with the increase in number of sub-blocks. In this paper a coded OFDM scheme with LDPC-RS concatenated codes using PTS is proposed. The design improves BER performance compared to traditional RS-convolution concatenated codes and the proposed modified PTS scheme reduces the computation complexity in terms of reduced complex multiplications and additions by significant margin and at the same time maintaining same PAPR reduction as conventional PTS scheme. OFDM system used in the paper complies with IEEE 802.11 a standard.","PeriodicalId":318875,"journal":{"name":"2015 International Conference on Signal Processing and Communication (ICSC)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116011450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Design of compact rectangular patch antenna using square grid and I shaped metamaterial 采用方形栅格和I型超材料的紧凑矩形贴片天线设计

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150634

Preet Kaur, S. Aggarwal, A. De

引用次数: 6

Trends in smart power grid communication and networking 智能电网通信与网络的发展趋势

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150680

P. Jain

引用次数: 12

Gain enhancement of butler matrix fed antenna array system by using planar circular EBG units 利用平面圆形EBG单元增强管家矩阵馈电天线阵列系统的增益

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150644

W. Bhowmik, V. Gupta, S. Srivastava, Laxman Prasad

{"title":"Gain enhancement of butler matrix fed antenna array system by using planar circular EBG units","authors":"W. Bhowmik, V. Gupta, S. Srivastava, Laxman Prasad","doi":"10.1109/ICSPCOM.2015.7150644","DOIUrl":"https://doi.org/10.1109/ICSPCOM.2015.7150644","url":null,"abstract":"In this paper planar circular Electromagnetic Band Gap (EBG) structures have been implemented in the Butler matrix fed antenna array system to improve the radiation performance of the system. Initially a conventional 4×4 Butler matrix fed antenna array system has been designed at 14.5 GHz. Asymmetricity in the gain values of major beams of the antenna array system has been observed both in simulation and measurement. Generally due to the design simplicity, light weight and compactness, the rectangular patch microstrip antenna has been used as the radiating element in the Butler matrix fed antenna array system. At higher frequencies microstrip antenna suffers from losses due to surface wave excitation. It degrades the radiation efficiency of the antenna array system and also increases the level of mutual coupling between the radiating elements in the antenna array. EBG (Electromagnetic Band Gap) units are used to improve the radiation performance of the system by the generation of stop band. The propagation of surface wave will be suppressed in this stop band region and may improve the performance of the system. To fulfill this requirement, 3 × 1 planar circular EBG unit has been designed. A stop band of 2.15 GHz with the centre frequency of 14.5 GHz has been obtained by the proposed EBG unit. The 3×1 planar circular EBG unit has been integrated between the radiating elements of the antenna array system. As a result the gain enhancement has been achieved for the 1R, 2L, 2R and 1L beams both in simulation and measurement at 14.5 GHz.","PeriodicalId":318875,"journal":{"name":"2015 International Conference on Signal Processing and Communication (ICSC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117049740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Brace design for knee-angle measurement in human gait using infrared sensor 基于红外传感器的人体步态膝角测量支架设计

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150647

Amit Kumar Vimal, S. Anand, S. Bhasin, P. Swami, Shivani Sharma

引用次数: 2

A novel design of reversible 2:4 decoder 一种可逆2:4解码器的新设计

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150670

Ritajit Majumdar, Sandeep Saini

引用次数: 17

Performance enhancement of InGaAs MOSFET using trench technology 利用沟槽技术增强InGaAs MOSFET的性能

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150667

M. Adhikari, Y. Singh

引用次数: 1

Analysis of post-wall waveguides using a model of two-dimensional photonic crystal waveguides 用二维光子晶体波导模型分析后壁波导

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150623

K. Yasumoto, H. Maeda, V. Jandieri

引用次数: 2

Generation of electrical energy from sound energy 由声能产生电能

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150687

Mehul Garg, Devyani Gera, Aman Bansal, Arpan Kumar

引用次数: 12

WDR coding based image compression technique using PCA 基于WDR编码的PCA图像压缩技术

2015 International Conference on Signal Processing and Communication (ICSC) Pub Date : 2015-03-16 DOI: 10.1109/ICSPCOM.2015.7150677

A. Vaish, M. Kumar

{"title":"WDR coding based image compression technique using PCA","authors":"A. Vaish, M. Kumar","doi":"10.1109/ICSPCOM.2015.7150677","DOIUrl":"https://doi.org/10.1109/ICSPCOM.2015.7150677","url":null,"abstract":"Image compression is the technique of reducing the number of bits required to represent a digital image, which can be accomplished by reducing the redundant and visually irrelevant information present in the images. In this study, a Wavelet Difference Reduction (WDR) coding based image compression technique is proposed which uses Principal Component Analysis (PCA). These techniques are combined in order to achieve high compression ratio with an acceptable degradation in the compressed images. The input image is first compressed using PCA. Few of the Principal Components are used to reconstruct the image. The reconstructed image obtained by PCA is further used as an input data for WDR compression. Since WDR is a wavelet based coding technique so it exploits local characteristics of the image and leads to high Compression Ratio (CR). Here, PCA and WDR are combined because PCA gives high image quality but low CR on the other hand WDR works opposite of it as it gives high CR. The proposed technique is applied on several test images and results are compared with WDR and JPEG2000 techniques. Results clearly show that the proposed technique is better than the existing techniques in terms of both objective and subjective fidelity criteria.","PeriodicalId":318875,"journal":{"name":"2015 International Conference on Signal Processing and Communication (ICSC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125114725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10