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2012 National Conference on Communications (NCC)最新文献

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A high coding gain and low decoding complexity STBC for four transmit antennas 一种高编码增益、低解码复杂度的四发射天线STBC
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176786
Nidhi Sharma, M. Bhatnagar, Monika Agrawal
{"title":"A high coding gain and low decoding complexity STBC for four transmit antennas","authors":"Nidhi Sharma, M. Bhatnagar, Monika Agrawal","doi":"10.1109/NCC.2012.6176786","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176786","url":null,"abstract":"Space-time block codes (STBCs) have attracted considerable attention as they provide reliable communication in multi-antenna systems. STBCs work on the principle of multiple transmissions of a data stream from different transmit antennas in multiple time slots. This redundancy reduces the data rate of the STBCs. In this paper, we propose a mapping function for PAM and square QAM constellation. Based on this mapping function, we propose an STBC for four transmit antennas which achieves high coding gain. We derive an expression of coding gain of the proposed STBC. It is further shown that the proposed STBC achieves full diversity and has a low peak-to-average power ratio (PAPR). A low-complexity decoder for the proposed STBC is also derived. We show that the proposed STBC outperforms the existing STBCs for four transmit antennas in terms of coding gain, PAPR, and decoding complexity.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127191080","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: 1
GREEN-IT: An approach to energy savings using energy aware network management system GREEN-IT:一种利用能源感知网络管理系统来节约能源的方法
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176913
S. K. Chaudhari, S. Nottath, M. Subramanian, H. Murthy
{"title":"GREEN-IT: An approach to energy savings using energy aware network management system","authors":"S. K. Chaudhari, S. Nottath, M. Subramanian, H. Murthy","doi":"10.1109/NCC.2012.6176913","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176913","url":null,"abstract":"During peak hours, the focus of an Internet service provider (ISP) is on meeting user demand and maintaining the quality of service of a network. However this leads to under-utilization of network devices/components in different parts of the network. Since the power consumption of network devices are constant and independent of their actual workloads, the under-utilized network devices/components continue to consume the same power as that of a component working at full workload. We propose an energy aware network management system (NMS) framework based on the centralized decision management system (CDMS) reported in [1]. The system uses Bayesian belief network (BBN) to predict the utilization in different ports of network routers. The information already available in the NMS is sufficient for the proposed framework. For implementing the proposed scheme, an extended interface management information base (MIB) is proposed, which includes an operational state. Simulations are performed on two standard networks - IndiaNet and ARPANet, and the results show that with the proposed approach the CDMS is able to save approximately 10-16% of power at the cost of 1-5% end-to-end delay overhead. The cost of re-routing and Simple Network Management Protocol (SNMP) messages is minimal and acceptable considering the total power saved by CDMS.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127871343","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
Validation of a DiffServ based QoS model implementation for real-time traffic in a test bed 基于DiffServ的实时流量QoS模型在测试台上的验证
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176841
Sruti Gan Chaudhuri, C. Kumar, R. V. Rajakumar
{"title":"Validation of a DiffServ based QoS model implementation for real-time traffic in a test bed","authors":"Sruti Gan Chaudhuri, C. Kumar, R. V. Rajakumar","doi":"10.1109/NCC.2012.6176841","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176841","url":null,"abstract":"This paper presents a DiffServ based adaptive QoS model for real-time interactive traffic in constrained bandwidth IP network without over provisioning the users. A WRR based QoS scheduling algorithm has been implemented to allocate the network resources to the users. A tuning parameter for VBR real-time traffic is also introduced in order to provide fair performance to the non real-time traffic as well. The QoS model is implemented at the transmitter edge of the network. Edge switches and routers are configured with the proposed algorithm. The simulation (using NS2) and experimental results (using a test bed with real time network scenario) are presented for validation of the proposed model.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131305370","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: 7
Speaker verification using sparse representation over KSVD learned dictionary 基于KSVD学习字典的稀疏表示说话人验证
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176916
B. C. Haris, R. Sinha
{"title":"Speaker verification using sparse representation over KSVD learned dictionary","authors":"B. C. Haris, R. Sinha","doi":"10.1109/NCC.2012.6176916","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176916","url":null,"abstract":"In this work, we explore the use of sparse representation of GMM mean shifted supervectors over a learned dictionary for the speaker verification (SV) task. In this method the dictionaries are learned using the KSVD algorithm unlike the recently proposed SV methods employing the sparse representation classification (SRC) over exemplar dictionaries. The proposed approach with learned dictionary results in an equal error rate of 1.56 % on NIST 2003 SRE dataset, which is found to be better than those of the state-of-the-art i-vector based approach and the exemplar based SRC approaches using either GMM mean shifted supervectors or i-vectors, with appropriate session/channel variability compensation techniques applied.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122866189","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
A mobility factor based path selection scheme for Mobile Ad-hoc Networks 一种基于移动性因子的移动自组网路径选择方案
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176811
S. Sarkar, R. Datta
{"title":"A mobility factor based path selection scheme for Mobile Ad-hoc Networks","authors":"S. Sarkar, R. Datta","doi":"10.1109/NCC.2012.6176811","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176811","url":null,"abstract":"In this paper, we propose a mobility factor based path selection scheme in Mobile Ad-hoc Network (MANET). In MANET, Nodal mobility is one of the important issues to determine the potential capacity of ad hoc networks. Various mobility metrics have been proposed in the literature as measurement of topological changes in networks. All such metrics describe the link or path stability to allow adaptive routing in MANET based on predicted link behaviour. We investigate and find that a path can become reliable and the average throughput of the network can increase if we select a route considering the mobility of the network nodes. Our proposed scheme selects the nodes to construct a path based on their mobility. In our work a trust value is generated by a trust module that calculates and compares mobility of the concerned nodes. Simulation results show that our proposed scheme performs better than pure Ad hoc On-Demand Distance Vector (AODV) and Dynamic Source Routing (DSR) protocols.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127676636","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: 9
Real-time enhancement of electrolaryngeal speech by spectral subtraction 频谱减法实时增强喉电语音
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176807
S. K. Basha, P. C. Pandey
{"title":"Real-time enhancement of electrolaryngeal speech by spectral subtraction","authors":"S. K. Basha, P. C. Pandey","doi":"10.1109/NCC.2012.6176807","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176807","url":null,"abstract":"An electrolarynx, a vibrator held against the neck tissue, is used by laryngectomy patients to provide excitation to the vocal tract as a substitute to that provided by the glottis. The quality and intelligibility of electrolaryngeal speech is generally poor because of the presence of background noise caused by leakage of acoustic energy from the vibrator and vibrator-tissue interface. This noise can be suppressed by pitch-synchronous application of spectral subtraction. The paper presents a real-time implementation of the spectral subtraction for enhancement of electrolaryngeal speech, using a 16-bit fixed-point DSP board. Electrolaryngeal speech is continuously acquired at 12 kHz using codec and DMA into the input buffers. It is processed using 256-point FFT, 3-frame 4-stage cascaded median-based dynamic estimation of noise, spectral subtraction, and IFFT, using two-pitch period window with 50 % overlap. The resynthesized speech is output using DMA and codec.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127315489","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: 13
Ultrasonic spectacles and waist-belt for visually impaired and blind person 视障人士及盲人使用的超声波眼镜及腰带
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176765
S. Bhatlawande, J. Mukhopadhyay, M. Mahadevappa
{"title":"Ultrasonic spectacles and waist-belt for visually impaired and blind person","authors":"S. Bhatlawande, J. Mukhopadhyay, M. Mahadevappa","doi":"10.1109/NCC.2012.6176765","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176765","url":null,"abstract":"This paper presents an electronic navigation system for visually impaired and blind people (subject). This system understands obstacles around the subject up to 500 cm in front, left and right direction using a network of ultrasonic sensors. It effectively calculates distance of the detected object from the subject and prepares navigation path accordingly avoiding obstacles. It uses speech feedback to aware the subject about the detected obstacle and its distance. This proposed system uses AT89S52 microcontroller based embedded system to process real time data collected using ultrasonic sensor network. Based on direction and distance of detected obstacle, relevant pre-recorded speech message stored in APR9600 flash memory is invoked. Such speech messages are conveyed to the subject using earphone.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126221788","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: 57
High throughput pipelined architecture for fast 2-D 4×4 forward integer transform of H.264 H.264快速二维4×4正向整数变换的高吞吐量流水线结构
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176853
R. Mukherjee, W. H. Prasad, P. Dheeraj, I. Chakrabarti, S. Sengupta
{"title":"High throughput pipelined architecture for fast 2-D 4×4 forward integer transform of H.264","authors":"R. Mukherjee, W. H. Prasad, P. Dheeraj, I. Chakrabarti, S. Sengupta","doi":"10.1109/NCC.2012.6176853","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176853","url":null,"abstract":"The H.264 standard uses integer transform block in its encoder. In this paper, a pipelined architecture of fast 2-D forward integer transform is proposed. For video compression applications such as Television Studio Broadcast or Surveillance Videos, where throughput is of prime importance for real-time encoding, we propose an efficient realization of the forward integer transform unit. Using Xilinx Virtex-5 technology, the proposed architecture gives an excellent throughput of 5383 Mpixels/sec, where the critical path delay is 2.97 ns and the maximum operating frequency is of 336 MHz.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128042110","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
Resistive feedback LNA with dual band notch filter for suppressing WLAN signals in UWB receivers 带双带陷波滤波器的电阻反馈LNA用于UWB接收机中抑制WLAN信号
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176809
M. Yargholi, A. P. Tarighat
{"title":"Resistive feedback LNA with dual band notch filter for suppressing WLAN signals in UWB receivers","authors":"M. Yargholi, A. P. Tarighat","doi":"10.1109/NCC.2012.6176809","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176809","url":null,"abstract":"A CMOS low noise amplifier with Out-of-band rejection for radio ultra-wide band receivers is designed and implemented in TSMC RF CMOS 0.18μm technology. Received power signal in UWB is smaller than narrow band interferences that are located near it, Thus we proposed a resistive feedback LNA that includes; input matching network, cascoded structure, RC feedback loop, LC load, output matching network and dual band notch filter with low power active inductor to improve the out-of-band rejection. Power gain of 16.03 and minimum noise figure of 2.4 dB at frequency of 3.76GHZ can be measured; maximum rejection of 20.3dB and 44.18 dB be achieved at 2.4GHz and 5.2GHZ respectively. The power dissipation of designed LNA with dual band notch filter is 15.75mW from 1.5V supply, while it was 13.5mW without notch filter.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128187063","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
The OFDM system based on Discrete Cosine Harmonic Wavelet transform 基于离散余弦谐波小波变换的OFDM系统
2012 National Conference on Communications (NCC) Pub Date : 2012-04-03 DOI: 10.1109/NCC.2012.6176766
M. Suma, S. Narasimhan, B. Kanmani
{"title":"The OFDM system based on Discrete Cosine Harmonic Wavelet transform","authors":"M. Suma, S. Narasimhan, B. Kanmani","doi":"10.1109/NCC.2012.6176766","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176766","url":null,"abstract":"This paper proposes a new OFDM systems based on A Discrete Cosine Harmonic Wavelet (DCHWT), for BPSK and QPSK signals. This has been realized by proposing new separate structures for BPSK and QPSK signals. This enables to utilize the energy compaction of DCT and the computational simplicity of DCHWT for OFDM systems. The proposed OFDM systems provide improved performance in terms of BER and PAPR compared to those of conventional OFDM based on DFT /DCT with Cyclic prefix. The new OFDMs have a better or equal performance compared to those of some of the existing wavelet based OFDMS.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125881108","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: 9
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