{"title":"Robust LLR aided low feedback precoding for interference alignment","authors":"N. Vinoth, A. Ayyar, B. Ramamurthi, K. Giridhar","doi":"10.1109/NCC.2010.5430223","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430223","url":null,"abstract":"Interference alignment, as proposed in [1], is a joint multi-base-station precoding technique where each interfering base-station determines its precoder so as to obtain aligned interfering signals at each user. Determination of such precoders requires complete channel state information of all the interfering links to be present at all the base-stations. In this paper, we present a modified form of interference alignment based on locally-available channel state information at the user equipment. We consider the downlink of a wireless system where basestations and user equipments are equiped with two antennas each and scheduling of users is done based on Fractional Frequency Reuse. Assuming an MMSE receiver at the user equipment, an expression for the optimal precoder to be used by the interfering base-stations is derived so that there is zero interference after MMSE equalization. We also give an example for the case where there is uncancelled interference despite the use of these precoders. The effect of this uncancelled interference is overcome by the use of a robust LLR developed in [2]. Simulation results that demonstrate the performance of the proposed technique are presented.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122234771","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}
{"title":"Performance analysis of zone routing protocols in Mobile Ad Hoc Networks","authors":"Brijesh V. Patel, S. Srivastava","doi":"10.1109/NCC.2010.5430164","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430164","url":null,"abstract":"In Mobile Ad Hoc Networks (MANETs), routing is a challenging task due to node mobility, traffic and network size. It is very important to analyze the scalability characteristics of the routing protocols with respect to these parameters. Zone Routing Protocol (ZRP) is considered to be one of the most scalable routing protocols due to its multi-scoping and hybridization features. We propose a general, parameterized model for analyzing control overhead of ZRP. A generic probabilistic model for data traffic is also proposed which can be replaced by different traffic models. Our analytical model is validated by comparisons with simulations performed under different network scenarios. In our simulation results, we have observed that the optimal zone radius lies at a point where proactive and reactive overhead components of ZRP are approximately equal as observed in [1]. Further, as the mobility increases the optimal zone radius value decreases, and as the traffic increases the value of optimal zone radius increases. If a node operates away from the optimal zone radius setting then it has to bear additional routing overhead. We show that the additional overhead is around 35% higher under a wide range of mobility scenarios.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126167785","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}
{"title":"A multicarrier CDMA based low probability of intercept network","authors":"Sayan Ghosal, D. Jalihal, K. Giridhar","doi":"10.1109/NCC.2010.5430216","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430216","url":null,"abstract":"The need for covert communication in tactical battlefields has developed the ideas of low probability of intercept (LPI) networks. Spread spectrum communication is used for LPI communication. Multicarrier CDMA is a new type of spread spectrum technique that has been developed in recent years. Most of the works in MC-CDMA are focused on finding out BER performance of it when different users share the same time and spectral ranges. But, LPI performance of MC-CDMA is not explored much. In this paper we have focused on understanding the LPI property of MC-CDMA. We have found out that increasing spreading factor and application of forward error control coding improve LPI property of MC-CDMA based wireless networks to a great extent.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130115524","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}
{"title":"Detection of SYN flooding attacks using generalized autoregressive conditional heteroskedasticity (GARCH) modeling technique","authors":"Nikhil Ranjan, H. Murthy, T. Gonsalves","doi":"10.1109/NCC.2010.5430151","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430151","url":null,"abstract":"This paper explores a fast and effective method to detect TCP SYN flooding attack. The Generalized autoregressive conditional heteroskedastic (GARCH) model which is the most commonly used statistical modeling technique for financial time series is proposed as a new technique for Denial of service attack detection. The exponential backoff and retransmission property of TCP during timeouts is exploited in the detection mechanism. We are able to detect low as well as high intensity SYN flooding attacks by modeling the difference between SYN and SYN+ACK packets using GARCH. Our studies show that this non linear volatility model performs better than earlier models like Linear Prediction.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"2018 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122958101","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}
{"title":"Resonator based compact ultra-wideband and notched wideband filters","authors":"S. Coumar, R. Nakkeeran, K. Thirumalaivasan","doi":"10.1109/NCC.2010.5430168","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430168","url":null,"abstract":"In this paper, three ultra wideband (UWB) bandpass filters using microstrip with wide passband, low insertion and return loss are presented. The proposed filters cover the UWB indoor mask range from 3.1GHz to 10.6GHz. The first filter has a circular plate resonator with interdigital coupling has been designed to act as bandpass filter with passband of 8.25 GHz. The second filter is achieved using equilateral octagonal structure by connecting its open stub to ground plane through via-hole. The third filter, which is derived from the first filer is designed to introduce notch in the frequency range from 4.85 to 5.85. The designed filters are successfully simulated by electromagnetic simulator, IE3D. The filters exhibit low insertion loss over the desired passband, and a good out-of-band performance.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128702680","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}
{"title":"Deriving a generic energy consumption model for network enabled devices","authors":"V. Jain, Gerard Parr, Dave Bustard, Philip Morrow","doi":"10.1109/NCC.2010.5430165","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430165","url":null,"abstract":"Energy saving has become a global issue when people use network enabled equipment in the office or at home. However few methods exist to measure and monitor energy use per user or per application, or to control equipment power states. We propose a generic energy consumption model that is based on the power state of network attached equipment, and that supports power management capabilities. This includes measures for each power state (on/off/sleep) and for per bit energy consumption, per interface, per application and at the network QoS (Quality of Services) level. Given the power state of a network device, a network manger could remotely inspect the energy consumption and make changes to the power management setting; for this to happen we introduce a new MIB (Management Information Base) schema to capture the attributes of relevance. Using an agent based modeling framework, we introduce the overall autonomic architecture that makes it possible to minimize energy consumption of network enabled equipment.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116987336","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}
{"title":"Mitigation of exposed terminals problem with differential capture capable receivers","authors":"Mayur M. Vegad, S. De, Brejesh Lall","doi":"10.1109/NCC.2010.5430158","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430158","url":null,"abstract":"Recent experimental studies on physical layer capture in 802.11 based networks have demonstrated that the minimum signal-to-interference ratio required for successful reception of a frame depends upon the order of arrivals of the sender's frame and the interference, and it is much less when the sender's frame arrives earlier. This differential capture capability (DCC) leads to a very small interference range around the receiver once it starts receiving a frame, and hence it allows considerable reduction in the required carrier sensing range. While the DCC feature of receivers helps alleviate some hidden and exposed terminal problems, there still remains many exposed nodes. In this paper, we further exploit the DCC feature to mitigate the problem of these exposed terminals that remain even after optimum reduction in carrier sensing range. We propose a liberal carrier sensing scheme that helps identify some of the exposed prospective receivers by using some already available local information and allow them to initiate secondary sessions. Through extensive simulations we demonstrate that the proposed scheme offers significant throughput gain over the conventional carrier sensing scheme that ignores the DCC feature.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117232563","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}
{"title":"Low-complexity, information-lossless STBCs for two-user MISO-MAC with partial CSIT","authors":"J. Harshan, B. Rajan","doi":"10.1109/NCC.2010.5430212","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430212","url":null,"abstract":"In this paper, Space-Time Block Codes (STBCs) with low Maximum-Likelihood (ML) decoding complexity and information-losslessness property are proposed for a two-user Multiple-Input Single-Output, frequency-flat fading multiple access channel. In particular, two distinct classes of STBC pairs which are derived from the well known class of real orthogonal designs are proposed. The first class of code pairs which are derived from a class of complex designs called separable orthogonal designs are shown to be (i) information-lossless for arbitrary values of Nt (where Nt denotes the number of transmit antennas of each user) and (ii) have reduced ML decoding complexity whereas the second class of code pairs are shown to be (i) information-lossless only for large values of Nt and (ii) are singlesymbol ML decodable.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122741676","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}
{"title":"Improving time-frequency sparsity for audio spatialization by time-adaptive windowing","authors":"P. Gaddipati, N. Dave, P. Rao, R. Velmurugan","doi":"10.1109/NCC.2010.5430178","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430178","url":null,"abstract":"We propose a new time-adaptive windowing technique to obtain a sparse time-frequency representation for audio signals. This transformation helps in providing better source separation from stereo mixtures for improved subsequent spatial rendering over headphones. We start with standard stereo audio recordings, transform them to a sparse representation and then estimate the mixing parameters to be used for source separation. The performance of the new representation is compared with existing methods via the accuracy of mixing parameters estimation for a test dataset of multi-speaker stereo mixtures.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125681699","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}
{"title":"Support vector regression based autoassociative models for time series classification","authors":"S. Chandrakala, C. Sekhar","doi":"10.1109/NCC.2010.5430179","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430179","url":null,"abstract":"There are two paradigms for modeling varying length time series data, namely, modeling the sequence of feature vectors and modeling the sets of vectors. In this paper, we propose a regression based autoassociative model for modeling sets of vectors for time series data. We also propose a hybrid framework where a regression based autoassociative model is used for representing varying length time series data and then a discriminative model is used for classification. The proposed approach applied to speech emotion recognition task gives a better performance than the conventional methods.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133773419","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}