2015 Twenty First National Conference on Communications (NCC)最新文献_第6页

200G system with PDM-16QAM: Performance evaluation and trade-offs 200G系统与PDM-16QAM:性能评估和权衡

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084894

Siddharth J. Varughese, Varughese Mathew, Smaranika Swain, D. Venkitesh, R. D. Koilpillai

引用次数: 3

Experimental studies on effect of speaking mode on spoken term detection 说话方式对口语词汇检测影响的实验研究

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084926

K. Rout, R. Pappagari, K. Murty

引用次数: 2

Iterative decoding of FEC based multiple description codes for image transmission over wireless channel 无线信道图像传输中基于FEC的多描述码迭代解码

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084817

Saikat Majumder, Shrish Verma

{"title":"Iterative decoding of FEC based multiple description codes for image transmission over wireless channel","authors":"Saikat Majumder, Shrish Verma","doi":"10.1109/NCC.2015.7084817","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084817","url":null,"abstract":"Multiple description coding has emerged as an attractive framework for robust transmission of multimedia information over packet loss and fading wireless channels. Forward error correction (FEC) based multiple description coding enables generation of an arbitrary number of descriptions from a progressive image bitstream. These descriptions are formed using erasure protection properties of Reed-Solomon codes and each code is spread across multiple packets. The level of protection is determined based on the relative importance of the information symbols in the progressive bitstream. Each description is then encoded using concatenation of convolutional code and CRC. This paper proposes an iterative soft decision decoding by exchanging extrinsic information between Reed-Solomon code across packets and convolutional coded descriptions transmitted over wireless channels, in contrast to existing approaches where hard decision is performed on the outcome of the inner channel code and outer FEC (Reed-Solomon code) is used to fill-up the erased descriptions. The simulation results over Rayleigh flat fading channel show significant improvement in received PSNR compared to baseline system.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130617604","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

A hybrid cooperative spectrum sensing for cognitive radio networks in presence of fading 认知无线电网络中存在衰落的混合协同频谱感知

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084887

A. Bhowmick, Sanjay Dhar Roy, S. Kundu

{"title":"A hybrid cooperative spectrum sensing for cognitive radio networks in presence of fading","authors":"A. Bhowmick, Sanjay Dhar Roy, S. Kundu","doi":"10.1109/NCC.2015.7084887","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084887","url":null,"abstract":"In this paper, we study a hybrid fusion scheme for cooperative spectrum sensing (CSS) where we combine the hard decisions and soft decisions from cognitive radio (CR) users based on quality of their reporting channel (R-channel). The CR users transmit their hard decisions if the estimated R-channel between them and the fusion centre (FC) exceeds censoring threshold else they send soft decision, i.e. the energy values. Based on the received hard decisions, the FC derives an intermediate hard decision using majority rules while an intermediate soft decision is obtained by combining the received soft decisions following MRC or EGC. Finally the FC combines the intermediate decisions via an OR rule to obtain the final decision regarding the primary user (PU). Analytical expressions have been developed as well as simulation has been carried out to evaluate the performance of the proposed scheme in presence of Rayleigh fading in both the sensing channel (S-channel) and R-channel, in terms of detection probability and total error probability. The performance of the proposed scheme is studied and compared for two cases of soft combining such as MRC with majority logic and EGC with majority logic. Furthermore, the scheme is compared with CSS using hard decision fusion based on censoring and CSS using soft decision fusion only. Impact of several parameters such as number of CRs, S-channel and R-channel SNR, censoring threshold, sensing threshold on the performance of the proposed scheme is shown. Our scheme outperforms the hard decision fusion with censoring of CRs in faded R-channel.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127894651","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: 16

Hardware implementation of Frequency Domain Link Adaptation for OFDMA based systems OFDMA系统频域链路自适应的硬件实现

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084895

Sandip Das, I. Chakrabarti, Suvra Shekhar Das

{"title":"Hardware implementation of Frequency Domain Link Adaptation for OFDMA based systems","authors":"Sandip Das, I. Chakrabarti, Suvra Shekhar Das","doi":"10.1109/NCC.2015.7084895","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084895","url":null,"abstract":"Frequency Domain Link Adaptation (FDLA) has been accepted as a promising technique to improve the spectral efficiency in Orthogonal Frequency Division Multiple Access (OFDMA) systems such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WIMAX). FDLA exploits the frequency domain channel variation by using adaptive bit and power loading scheme in frequency domain. In this paper, we propose a hardware efficient architecture of adaptive bit loading scheme and implement the same in FPGA. It is shown that the FPGA design provides power efficiency and lower latency implementation. The design is shown to be flexible and reconfigurable and is compatible with multiple standards with different configurations. In this work, two different FDLA algorithms are implemented. This design is implemented in Wireless Open Access Research Platform (WARP) which has virtex-4 FPGA in its core for processing. The design is tested for its over the air performance by integrating it with FPGA based MIMO-OFDMA testbed, developed on the WARP platform. Real time over the air performance results are presented for uncoded systems.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129443372","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: 2

Co-ordinate interleaved amplify-and-forward relaying with a multi-antenna relay 用多天线中继协调交错放大和前向中继

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084851

N. AparnaVishnu, S. Bhashyam

{"title":"Co-ordinate interleaved amplify-and-forward relaying with a multi-antenna relay","authors":"N. AparnaVishnu, S. Bhashyam","doi":"10.1109/NCC.2015.7084851","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084851","url":null,"abstract":"Amplify-and-forward (AF) relaying protocols are an important class of cooperative relaying protocols. Non-orthogonal AF (NAF) relaying, where the source sends new information while the relay forwards previously transmitted information, can achieve higher transmission rates than orthogonal relaying, where the source and relay do not transmit simultaneously. However, all the transmitted symbols in NAF relaying do not achieve full cooperative diversity. Precoding of symbols can address this problem. Recently, a coordinate interleaved NAF (CINAF) protocol has been proposed for NAF relaying with a single-antenna relay. In this paper, we extend this protocol to the multi-antenna relay (or multiple cooperative relays) setting. The linear transformation F used for amplifying at the relay is identified as an important component. Four designs for F are presented and compared extensively using simulations. The importance of channel state information (CSI) at the relay is studied. While full CSI about the source-relay channel is used, limited CSI about the relay-destination channel combined with antenna selection at the relay is observed to be sufficient to achieve most of the performance gain.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133969469","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: 0

Speech vs music discrimination using Empirical Mode Decomposition 基于经验模态分解的语音与音乐区分

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084865

B. K. Khonglah, Rajib Sharma, S. Prasanna

引用次数: 7

Network traffic classification in encrypted environment: A case study of Google Hangout 加密环境下的网络流量分类:以Google Hangout为例

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084879

Jayeeta Datta, N. Kataria, N. Hubballi

{"title":"Network traffic classification in encrypted environment: A case study of Google Hangout","authors":"Jayeeta Datta, N. Kataria, N. Hubballi","doi":"10.1109/NCC.2015.7084879","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084879","url":null,"abstract":"Traffic classification is an important task for providing differentiated service quality to applications and also for security monitoring. With the advent of peer-to-peer applications and tunneling techniques it is becoming increasingly difficult to identify the traffic without going to the application semantics. Several approaches have been proposed (with varied success) which use machine learning techniques to identify the application traffic. In this paper we propose a novel technique based on application behavior based feature extraction and classification. We experiment with Google Hangout as a case study and report its detection results. Google Hangout is a semi peer-to-peer application allowing two parties to do video chat online. We performed experiments with a dataset consisting of several hours of network traffic consisting of 2.5 million packets and report results on 3 classification algorithms namely Naive Base, decision tree and AdaBoost. We conducted 3 sets of experiments with different combinations of data and performed 10 fold cross validation in each case to assess the classification performance.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125249570","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: 20

Contention versus polling access in IEEE 802.15.6: Delay and lifetime analysis IEEE 802.15.6中的争用与轮询访问:延迟和生命周期分析

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084902

Anil K. Jacob, G. S. Kishore, L. Jacob

引用次数: 13

Automatic gender classification using the mel frequency cepstrum of neutral and whispered speech: A comparative study 中性语和耳语语音中低频倒谱自动性别分类的比较研究

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-04-16 DOI: 10.1109/NCC.2015.7084886

N. Meenakshi, P. Ghosh

{"title":"Automatic gender classification using the mel frequency cepstrum of neutral and whispered speech: A comparative study","authors":"N. Meenakshi, P. Ghosh","doi":"10.1109/NCC.2015.7084886","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084886","url":null,"abstract":"A whispered speech resembles an unvoiced speech due to the lack of vocal fold vibration unlike the neutral speech. Since information about the gender of a speaker typically lies in the pitch resulted from the vocal fold vibration (or source signal), identifying gender from the whispered speech is more challenging compared to that from the neutral speech. In the absence of the pitch, we study the use of the vocal tract filter captured through the spectral envelope for automatic gender classification (AGC) from a whispered speech. The spectral envelope is represented by the Mel frequency cepstral coefficients (MFCCs). We also compare the AGC performance from the neutral speech using only MFCCs with that from the whispered speech. AGC experiment using a set of 33 sentences spoken in neutral and whispered mode by 16 female and 20 male speakers reveals that the AGC accuracy using the neutral speech is, on average, higher (4.5% absolute) than that using the whispered speech when only the spectral shape information is used. This is true even when we use a subset of MFCCs obtained by a forward cepstral coefficient selection algorithm. However, the AGC accuracy obtained using the MFCC of the neutral speech is found to be 2.83% (absolute) lower compared to that using pitch. These findings not only suggest that there is gender specific information in the spectral shape but also indicate that the spectral shape carries less gender specific information when a speaker whispers as opposed to speaking normally.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130707651","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: 5