Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611687
P. Zicari, P. Corsonello, S. Perri
The more increasing necessity of integration inside digital systems together with the advantages in terms of portability, reduced time-to-market, better flexibility and versatility, lead towards integrated all-digital FPGA based communication systems. Bit synchronization is a fundamental operation required for the best symbol detection. A high flexible Early-Late Gate implementation is proposed, it is optimized for low resource consumption in FPGA implementations.
{"title":"A high flexible Early-Late Gate bit synchronizer in FPGA-based software defined radios","authors":"P. Zicari, P. Corsonello, S. Perri","doi":"10.1109/ECCSC.2008.4611687","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611687","url":null,"abstract":"The more increasing necessity of integration inside digital systems together with the advantages in terms of portability, reduced time-to-market, better flexibility and versatility, lead towards integrated all-digital FPGA based communication systems. Bit synchronization is a fundamental operation required for the best symbol detection. A high flexible Early-Late Gate implementation is proposed, it is optimized for low resource consumption in FPGA implementations.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116407309","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}
Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611698
P. Westermann, G. Beier, H. Ait-Harma, L. Schwoerer
The software defined radio principle is a key technology for mobile devices as well as base stations. Especially femto cells for small-distance indoor environments are of major interest. This paper presents an evaluation of the embedded vector processor (EVP) as one possible principal component of an SDR femto-sized base station. We present results of our performance analysis of selected W-CDMA baseband algorithms. We give a detailed description of the mapping of a SIMO chip- equalizer and an HSDPA downlink spreader on the EVP. The achieved performance demonstrates that the EVP may satisfy real-time requirements of current mobile communication standards.
{"title":"Performance analysis of W-CDMA algorithms on a vector DSP","authors":"P. Westermann, G. Beier, H. Ait-Harma, L. Schwoerer","doi":"10.1109/ECCSC.2008.4611698","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611698","url":null,"abstract":"The software defined radio principle is a key technology for mobile devices as well as base stations. Especially femto cells for small-distance indoor environments are of major interest. This paper presents an evaluation of the embedded vector processor (EVP) as one possible principal component of an SDR femto-sized base station. We present results of our performance analysis of selected W-CDMA baseband algorithms. We give a detailed description of the mapping of a SIMO chip- equalizer and an HSDPA downlink spreader on the EVP. The achieved performance demonstrates that the EVP may satisfy real-time requirements of current mobile communication standards.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124695041","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}
Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611696
L. Perisoara, M. Neghina, R. Stoian
Multiple input multiple output (MIMO) communication systems are used to increase the channel capacity or the data rate for a particular connection through multiplexing or to improve performance through diversity. In this paper, we present and study the performances of an orthogonal frequency division multiplexing (OFDM)-MIMO system using different forward error correcting (FEC) codes. Several constituent codes have been tested: block codes, convolutional codes and concatenated codes. The implemented system considers only QAM constellations, Rayleigh flat fading channels, no channel state information (CSI) at the transmitter and with CSI at the receiver.
{"title":"Performances of FEC coded MIMO OFDM systems","authors":"L. Perisoara, M. Neghina, R. Stoian","doi":"10.1109/ECCSC.2008.4611696","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611696","url":null,"abstract":"Multiple input multiple output (MIMO) communication systems are used to increase the channel capacity or the data rate for a particular connection through multiplexing or to improve performance through diversity. In this paper, we present and study the performances of an orthogonal frequency division multiplexing (OFDM)-MIMO system using different forward error correcting (FEC) codes. Several constituent codes have been tested: block codes, convolutional codes and concatenated codes. The implemented system considers only QAM constellations, Rayleigh flat fading channels, no channel state information (CSI) at the transmitter and with CSI at the receiver.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123978060","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}
Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611665
L. Dumitriu, M. Iordache
The efficient simulation of large-scale dynamic systems needs a systematic procedure for order reduction of the original circuit. The paper combines the projection method with Krylov subspaces to obtain robust and accurate order reduction techniques. First of all, the algorithm finds a basis matrix onto Krylov subspaces, using a block Arnoldi process, and then constructs a reduced-order model via projection technique. It is shown that we can handle the MIMO systems using the semi-state method and Krylov projection method. An illustrative example is given and some conclusions are pointed out.
{"title":"Reduced-order modelling of large linear passive circuits using Krylov projection method","authors":"L. Dumitriu, M. Iordache","doi":"10.1109/ECCSC.2008.4611665","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611665","url":null,"abstract":"The efficient simulation of large-scale dynamic systems needs a systematic procedure for order reduction of the original circuit. The paper combines the projection method with Krylov subspaces to obtain robust and accurate order reduction techniques. First of all, the algorithm finds a basis matrix onto Krylov subspaces, using a block Arnoldi process, and then constructs a reduced-order model via projection technique. It is shown that we can handle the MIMO systems using the semi-state method and Krylov projection method. An illustrative example is given and some conclusions are pointed out.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127364033","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}
Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611701
C. N. Nzeza, A. Flament, A. Frappé, A. Kaiser, A. Cathelin, J. Muller
Digital generation of radio-frequency signals is a key concept of software defined radio. One of the main difficulties for multi-standard transmitter design based on delta-sigma (DeltaSigma) modulators is to respect the different specifications in terms of out-of-band spurious emission. Focusing on the TX path of a UMTS/DCS1800 mobile phone, we propose hereinafter an efficient method aiming at synthesizing a complex 5th-order DeltaSigma modulator which respects the targeted standards spurious specifications. The use of a complex noise transfer function allows a better optimization of noise shaping. In addition, this approach eases the reconfiguration of the modulator, and, it is a powerful tool for all order (real and complex) DeltaSigma modulators synthesis, as it will be illustrated.
{"title":"Reconfigurable complex digital Delta-Sigma modulator synthesis for digital wireless transmitters","authors":"C. N. Nzeza, A. Flament, A. Frappé, A. Kaiser, A. Cathelin, J. Muller","doi":"10.1109/ECCSC.2008.4611701","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611701","url":null,"abstract":"Digital generation of radio-frequency signals is a key concept of software defined radio. One of the main difficulties for multi-standard transmitter design based on delta-sigma (DeltaSigma) modulators is to respect the different specifications in terms of out-of-band spurious emission. Focusing on the TX path of a UMTS/DCS1800 mobile phone, we propose hereinafter an efficient method aiming at synthesizing a complex 5th-order DeltaSigma modulator which respects the targeted standards spurious specifications. The use of a complex noise transfer function allows a better optimization of noise shaping. In addition, this approach eases the reconfiguration of the modulator, and, it is a powerful tool for all order (real and complex) DeltaSigma modulators synthesis, as it will be illustrated.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121552272","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}
Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611666
S. Krutchinsky
The R-filters general properties are defined within a general structure of the circuits with operational amplifiers. It is shown that it is possible to achieve a wider dynamic range when the same sensibility of the second order sections characteristics if we introduce additional RC-components. The above filters make possible to reduce the chip area, consumption current and to combine (match) several functions in one circuit. We also present the simulated results of the bandwidth filter section and low pass filter in Cadence Virtuoso environment for SGB25VD processing.
{"title":"Active R-filters with additional RC-circuits","authors":"S. Krutchinsky","doi":"10.1109/ECCSC.2008.4611666","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611666","url":null,"abstract":"The R-filters general properties are defined within a general structure of the circuits with operational amplifiers. It is shown that it is possible to achieve a wider dynamic range when the same sensibility of the second order sections characteristics if we introduce additional RC-components. The above filters make possible to reduce the chip area, consumption current and to combine (match) several functions in one circuit. We also present the simulated results of the bandwidth filter section and low pass filter in Cadence Virtuoso environment for SGB25VD processing.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117087683","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}
Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611682
P. Bernardi, F. Gandino, F. Lamberti, B. Montrucchio, M. Rebaudengo, E. R. Sanchez
Radio frequency identification (RFID) is an identification technology that is particularly interesting for several kinds of physical objects, either living beings or inanimate items. In this paper we propose to use it to implement an anti-counterfeit mechanism in selected wine production environments. Using a personal digital assistant (PDA) with a public/private key mechanism involving both the passive RFID internal memory and the unique RFID identifier it is possible for the reseller and the final user to verify if the bottle is original. A sample bottle is used to simplify the encoding operation even in a low technology environment like a traditional cellar, also reducing the risk of losing the private key. Finally, implementation issues are considered, in order to confirm method feasibility.
{"title":"An anti-counterfeit mechanism for the application layer in low-cost RFID devices","authors":"P. Bernardi, F. Gandino, F. Lamberti, B. Montrucchio, M. Rebaudengo, E. R. Sanchez","doi":"10.1109/ECCSC.2008.4611682","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611682","url":null,"abstract":"Radio frequency identification (RFID) is an identification technology that is particularly interesting for several kinds of physical objects, either living beings or inanimate items. In this paper we propose to use it to implement an anti-counterfeit mechanism in selected wine production environments. Using a personal digital assistant (PDA) with a public/private key mechanism involving both the passive RFID internal memory and the unique RFID identifier it is possible for the reseller and the final user to verify if the bottle is original. A sample bottle is used to simplify the encoding operation even in a low technology environment like a traditional cellar, also reducing the risk of losing the private key. Finally, implementation issues are considered, in order to confirm method feasibility.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131120411","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}
Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611660
M. Alexiu, D. Aiordachioaie
This paper proposes a scheme for decreasing the number of parameters identified by adaptive filters (with finite impulse response). The decrease of the computational complexity and the increase of the convergence speed are among the benefits of using the proposed identification scheme. A second order Volterra system is considered as reference system to be identified. A filter bank is used to decompose the (stationary) input signal into several components, which are then cross-multiplied and used as input sequence for an adaptive algorithm. Due to its good convergence properties, RLS is used in this paper as adaptive algorithm; current RLS implementations require a computational complexity that exponentially grows with the number of parameters. One set of functions are used for the impulse responses of the filter bank: reverse biorthogonal spline wavelet functions. The experiments are analyzed from identification accuracy, tracking capability, identified impulse response and obtained quality versus needed computational complexity points of view; RLS convergence data is provided.
{"title":"Nonlinear system identification using a prefiltering bank with wavelet impulse responses","authors":"M. Alexiu, D. Aiordachioaie","doi":"10.1109/ECCSC.2008.4611660","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611660","url":null,"abstract":"This paper proposes a scheme for decreasing the number of parameters identified by adaptive filters (with finite impulse response). The decrease of the computational complexity and the increase of the convergence speed are among the benefits of using the proposed identification scheme. A second order Volterra system is considered as reference system to be identified. A filter bank is used to decompose the (stationary) input signal into several components, which are then cross-multiplied and used as input sequence for an adaptive algorithm. Due to its good convergence properties, RLS is used in this paper as adaptive algorithm; current RLS implementations require a computational complexity that exponentially grows with the number of parameters. One set of functions are used for the impulse responses of the filter bank: reverse biorthogonal spline wavelet functions. The experiments are analyzed from identification accuracy, tracking capability, identified impulse response and obtained quality versus needed computational complexity points of view; RLS convergence data is provided.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126749297","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}
Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611695
A. Rahmati, P. Azmi
Conventional OFDM symbol detection at the receiver becomes difficult if multipath fading channels have spectral nulls. In this paper, we consider an oversampled OFDM system which is a special case of the precoded OFDM systems. We show that the system performance is significantly improved if the deep faded symbols on the subcarriers of each oversampled OFDM signal are discarded and then reconstructed from the remaining ones. In fact, dropping the weak symbols at the receive side results in a nonuniform sampled version of the oversampled OFDM signal and as the nonuniform sampling theorem guarantees, as long as the average symbol rate of the symbols on the remaining subcarriers stays above the Nyquist rate, the perfect OFDM signal recovery is possible. For reconstructing the symbols on the weak subcarriers from the symbols on the remaining subcarriers at the receiver, we consider an iterative receiver for its fast convergence rate and its simple implementation. Simulation results reveal the oversampled OFDM system performance valuable merits as compared to that of the conventional detector for the OFDM system.
{"title":"Iterative reconstruction of oversampled OFDM signals over deep fading channels","authors":"A. Rahmati, P. Azmi","doi":"10.1109/ECCSC.2008.4611695","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611695","url":null,"abstract":"Conventional OFDM symbol detection at the receiver becomes difficult if multipath fading channels have spectral nulls. In this paper, we consider an oversampled OFDM system which is a special case of the precoded OFDM systems. We show that the system performance is significantly improved if the deep faded symbols on the subcarriers of each oversampled OFDM signal are discarded and then reconstructed from the remaining ones. In fact, dropping the weak symbols at the receive side results in a nonuniform sampled version of the oversampled OFDM signal and as the nonuniform sampling theorem guarantees, as long as the average symbol rate of the symbols on the remaining subcarriers stays above the Nyquist rate, the perfect OFDM signal recovery is possible. For reconstructing the symbols on the weak subcarriers from the symbols on the remaining subcarriers at the receiver, we consider an iterative receiver for its fast convergence rate and its simple implementation. Simulation results reveal the oversampled OFDM system performance valuable merits as compared to that of the conventional detector for the OFDM system.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128476881","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}
Pub Date : 2008-07-10DOI: 10.1109/ECCSC.2008.4611643
A. Cathelin, D. Belot
A collection of slides from the authorpsilas conference presentation is given.
本文给出了作者会议演讲的幻灯片集。
{"title":"CMOS versus SiGe BiCMOS, for RF transceivers design","authors":"A. Cathelin, D. Belot","doi":"10.1109/ECCSC.2008.4611643","DOIUrl":"https://doi.org/10.1109/ECCSC.2008.4611643","url":null,"abstract":"A collection of slides from the authorpsilas conference presentation is given.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133139956","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：