Due to difficulties in deriving the probability density function, the performance of the maximal ratio combining (MRC) diversity receiver in correlated Rician fading channels is rarely reported in the literature. This article shows that the difficulty can be avoided by a linear transformation technique. General closed-form expressions of the average symbol error rate (SER) for various modulation schemes can be easily derived. As an example, this paper derives the SER of multilevel quadrature amplitude modulation (MQAM) over correlated Rician fading channels.
{"title":"MRC receiver performance with MQAM in correlated Rician fading channels","authors":"Chunhua Yang, G. Bi, A. R. Leyman","doi":"10.1109/SSP.2001.955259","DOIUrl":"https://doi.org/10.1109/SSP.2001.955259","url":null,"abstract":"Due to difficulties in deriving the probability density function, the performance of the maximal ratio combining (MRC) diversity receiver in correlated Rician fading channels is rarely reported in the literature. This article shows that the difficulty can be avoided by a linear transformation technique. General closed-form expressions of the average symbol error rate (SER) for various modulation schemes can be easily derived. As an example, this paper derives the SER of multilevel quadrature amplitude modulation (MQAM) over correlated Rician fading channels.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"20 1","pages":"210-212"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82354709","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}
Two detectors of symmetrically distributed independent timing jitter in a data record composed of a complex harmonic in additive white Gaussian noise are proposed. The proposed detectors are computationally efficient and, although they are formulated using asymptotic results, they may be effectively used with small sample lengths under a wide range of conditions. The performances of the detectors are analysed using simulations and theoretical results.
{"title":"Detection of independent timing jitter in sinusoidal measurements","authors":"M. Morelande, D. R. Iskander","doi":"10.1109/SSP.2001.955252","DOIUrl":"https://doi.org/10.1109/SSP.2001.955252","url":null,"abstract":"Two detectors of symmetrically distributed independent timing jitter in a data record composed of a complex harmonic in additive white Gaussian noise are proposed. The proposed detectors are computationally efficient and, although they are formulated using asymptotic results, they may be effectively used with small sample lengths under a wide range of conditions. The performances of the detectors are analysed using simulations and theoretical results.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"23 1","pages":"182-185"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82428025","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}
Fast analog to digital conversion with only one bit per sample not only makes high sampling rates possible but also reduces the required hardware complexity. For short data buffers or block lengths, it has been shown that tone frequency estimators can be implemented by a simple table look-up. We present an analysis of such tables using the Hadamard transform. As an outcome of the analysis, we propose a class of nonlinear estimators of low complexity. Their performance is evaluated using numerical simulations. Comparisons are made with the proper Cramer-Rao bound and with the table look-up approach.
{"title":"Frequency estimation utilizing the Hadamard transform","authors":"T. Andersson, M. Skoglund, P. Handel","doi":"10.1109/SSP.2001.955309","DOIUrl":"https://doi.org/10.1109/SSP.2001.955309","url":null,"abstract":"Fast analog to digital conversion with only one bit per sample not only makes high sampling rates possible but also reduces the required hardware complexity. For short data buffers or block lengths, it has been shown that tone frequency estimators can be implemented by a simple table look-up. We present an analysis of such tables using the Hadamard transform. As an outcome of the analysis, we propose a class of nonlinear estimators of low complexity. Their performance is evaluated using numerical simulations. Comparisons are made with the proper Cramer-Rao bound and with the table look-up approach.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"25 1","pages":"409-412"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86675190","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}
We present a novel algorithm for the estimation of the direction of arrival and angular distribution parameters of sources that, as a result from the scattering effects, cannot be considered as punctual. The algorithm is iterative and is based on the maximization of the likelihood function associated to the received snapshots at the antenna array (ML). It is proposed a computationally efficient method for estimating the localization and angular distribution parameters of more than one source transmitting at the same frequency in a noisy environment. This algorithm solves the problem of the joint maximization in the case of two sources by formulating two new problems of a single-source ML.
{"title":"Iterative algorithm for the estimation of distributed sources localization parameters","authors":"A. P. Iserte, A. Pérez-Neira, M.A.L. Hernandez","doi":"10.1109/SSP.2001.955339","DOIUrl":"https://doi.org/10.1109/SSP.2001.955339","url":null,"abstract":"We present a novel algorithm for the estimation of the direction of arrival and angular distribution parameters of sources that, as a result from the scattering effects, cannot be considered as punctual. The algorithm is iterative and is based on the maximization of the likelihood function associated to the received snapshots at the antenna array (ML). It is proposed a computationally efficient method for estimating the localization and angular distribution parameters of more than one source transmitting at the same frequency in a noisy environment. This algorithm solves the problem of the joint maximization in the case of two sources by formulating two new problems of a single-source ML.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"80 1","pages":"528-531"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73347446","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}
Fractional-delay digital filter (FD-DF), implemented using the Farrow (1988) structure, is very attractive in providing online tuning delay of digital signals. This paper proposes a new method for the design of such Farrow-based FD-DF using sum-of-powers-of-two (SOPOT) coefficients. Using the SOPOT coefficient representation, coefficient multiplication can be implemented with limited number of shifts and additions. Design examples show that the proposed method can greatly reduce the design time and complexity of the Farrow structure while providing comparable phase and amplitude responses.
{"title":"An efficient design or fractional-delay digital FIR filters using the Farrow structure","authors":"C. Pun, Y. Wu, S. Chan, K. Ho","doi":"10.1109/SSP.2001.955357","DOIUrl":"https://doi.org/10.1109/SSP.2001.955357","url":null,"abstract":"Fractional-delay digital filter (FD-DF), implemented using the Farrow (1988) structure, is very attractive in providing online tuning delay of digital signals. This paper proposes a new method for the design of such Farrow-based FD-DF using sum-of-powers-of-two (SOPOT) coefficients. Using the SOPOT coefficient representation, coefficient multiplication can be implemented with limited number of shifts and additions. Design examples show that the proposed method can greatly reduce the design time and complexity of the Farrow structure while providing comparable phase and amplitude responses.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"93 1","pages":"595-598"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79614405","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}
J. Grajal, R. Blazquez, G. Lopez, J. M. Sanz, M. Burgos
Two opposite requirements for digital broadband electronic warfare receivers are detection of simultaneous signals and real time operation. The monobit receiver represents an attempt to achieve both characteristics at the expense of low instantaneous dynamic range. This paper presents a detailed theoretical and experimental analysis and characterization of the performance of this promising receiver.
{"title":"Monobit receiver for electronic warfare","authors":"J. Grajal, R. Blazquez, G. Lopez, J. M. Sanz, M. Burgos","doi":"10.1109/SSP.2001.955241","DOIUrl":"https://doi.org/10.1109/SSP.2001.955241","url":null,"abstract":"Two opposite requirements for digital broadband electronic warfare receivers are detection of simultaneous signals and real time operation. The monobit receiver represents an attempt to achieve both characteristics at the expense of low instantaneous dynamic range. This paper presents a detailed theoretical and experimental analysis and characterization of the performance of this promising receiver.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"28 1","pages":"138-141"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79002631","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}
This paper addresses the problem of semi-blind multi-input multi-output (MIMO) equalization of time-varying channels by employing recursive filtering methods. Based on a realistic channel model described in COST 207 project, we derive a state-space model that characterizes the behavior of the channel in time. The channel estimation and tracking are performed using a Kalman filter method, and a decision feedback equalizer derived using MMSE criterion is used to perform the equalization.
{"title":"Recursive semi-blind equalizer for time-varying MIMO channels","authors":"M. Enescu, M. Sirbu, V. Koivunen","doi":"10.1109/SSP.2001.955279","DOIUrl":"https://doi.org/10.1109/SSP.2001.955279","url":null,"abstract":"This paper addresses the problem of semi-blind multi-input multi-output (MIMO) equalization of time-varying channels by employing recursive filtering methods. Based on a realistic channel model described in COST 207 project, we derive a state-space model that characterizes the behavior of the channel in time. The channel estimation and tracking are performed using a Kalman filter method, and a decision feedback equalizer derived using MMSE criterion is used to perform the equalization.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"28 1","pages":"289-292"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80020243","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}
An alternate formulation of the LMS algorithm is presented by expressing the mean square error as a convex function of a set of hyperbolic variables that are monotonically related to the filter tap weights. The proposed algorithm is ideally suited to CORDIC-based realization and possesses very good convergence characteristics as revealed via extensive simulation studies.
{"title":"A hyperbolic LMS algorithm for CORDIC based realization","authors":"M. Chakraborty, S. Pervin, T. S. Lamba","doi":"10.1109/SSP.2001.955300","DOIUrl":"https://doi.org/10.1109/SSP.2001.955300","url":null,"abstract":"An alternate formulation of the LMS algorithm is presented by expressing the mean square error as a convex function of a set of hyperbolic variables that are monotonically related to the filter tap weights. The proposed algorithm is ideally suited to CORDIC-based realization and possesses very good convergence characteristics as revealed via extensive simulation studies.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"147 1","pages":"373-376"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76087582","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}
The connection between the instantaneous frequency and the angle derivative of the fractional power spectra is established. It permits to solve the signal retrieval problem if only two close fractional power spectra are known. This fact is used in the reconstruction of the Wigner distribution or the pseudo Wigner distribution from two close projections.
{"title":"Wigner distribution reconstruction from two projections","authors":"T. Alieva, Mj Martin Bastiaans, L. Stanković","doi":"10.1109/SSP.2001.955288","DOIUrl":"https://doi.org/10.1109/SSP.2001.955288","url":null,"abstract":"The connection between the instantaneous frequency and the angle derivative of the fractional power spectra is established. It permits to solve the signal retrieval problem if only two close fractional power spectra are known. This fact is used in the reconstruction of the Wigner distribution or the pseudo Wigner distribution from two close projections.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"5 1","pages":"325-328"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87654077","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}
We consider Friedlander's(1993) array interpolation technique, whose main shortcoming in multi-source scenarios is that it does not provide sufficient robustness against sources arriving outside specified interpolation sectors. We propose a new interpolation approach which incorporates such robustness property. Our technique minimizes the interpolation error inside the sector of interest while setting multiple "stopband" constraints outside this sector to prevent performance degradation effects caused by out-of-sector sources. Based on such robust approach to array interpolation, we develop convex formulations of the interpolation matrix design problem using second-order cone (SOC) programming.
{"title":"A robust technique for array interpolation using second-order cone programming","authors":"M. Pesavento, A. Gershman, Z. Luo","doi":"10.1109/SSP.2001.955261","DOIUrl":"https://doi.org/10.1109/SSP.2001.955261","url":null,"abstract":"We consider Friedlander's(1993) array interpolation technique, whose main shortcoming in multi-source scenarios is that it does not provide sufficient robustness against sources arriving outside specified interpolation sectors. We propose a new interpolation approach which incorporates such robustness property. Our technique minimizes the interpolation error inside the sector of interest while setting multiple \"stopband\" constraints outside this sector to prevent performance degradation effects caused by out-of-sector sources. Based on such robust approach to array interpolation, we develop convex formulations of the interpolation matrix design problem using second-order cone (SOC) programming.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"30 1","pages":"217-220"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90385754","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}
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