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Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)最新文献

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On-board processing for satellite communications 卫星通信的机载处理
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711488
E. Sabry, S. El-noubi, W. Abdalla
{"title":"On-board processing for satellite communications","authors":"E. Sabry, S. El-noubi, W. Abdalla","doi":"10.1109/NRSC.1998.711488","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711488","url":null,"abstract":"This paper describes analysis and simulation of the convolve multiply convolve (CMC) which can be easily implemented with a surface acoustic wave (SAW) device. The results show that windowing is an effective means of reducing the side-lobe level of the output transform, but it is at the expense of widening the main-lobe.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122385967","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
Theory and design of two-channel, perfect reconstruction, quadrature mirror IIR filter banks 双通道、完美重构、正交镜IIR滤波器组的理论与设计
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711479
M. Abo-Zahhad
{"title":"Theory and design of two-channel, perfect reconstruction, quadrature mirror IIR filter banks","authors":"M. Abo-Zahhad","doi":"10.1109/NRSC.1998.711479","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711479","url":null,"abstract":"It is well known that filter banks that satisfy perfect reconstruction property can be obtained with selective linear phase FIR analysis and synthesis filters. The perfect reconstruction property guarantees that the filter bank is distortion less and thus the reconstructed signal is a delayed version of the input signal. Although they are less expensive and yield superior stopband characteristics, perfect reconstruction cannot be achieved with stable infinite impulse response (IIR) filters. IIR designs usually incorporate a post-processing equalizer that is optimized to reduce the phase distortion of the entire filter bank. This paper solves an open problem; namely how to construct a two-channel perfect reconstruction filter bank with rational transfer functions. A computationally simple method to obtain IIR analysis and synthesis filters that possess zero phase distortion is presented. The method is based on amplitude and phase correction of the main subband filters designed on amplitude bases. Conventional Butterworth, Chebyshev or elliptic amplitude based filters are used as decimated-interpolated analysis-synthesis filters. The amplitude and phase corrections are carried out by using a narrow band auxiliary channel which is neither decimated nor interpolated. The developed filter bank structure offers advantages in easy and flexibility of design as well as in less computational complexity compared to the conventional QMF banks with the same performances.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130958244","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
BER analysis of GMSK with one-bit differential detection and offset receiver diversity in frequency-selective Rayleigh channels with CCI 在带CCI的频率选择瑞利信道中，采用位差分检测和偏置接收机分集的GMSK误码率分析
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711494
K.A.M. Soliman
{"title":"BER analysis of GMSK with one-bit differential detection and offset receiver diversity in frequency-selective Rayleigh channels with CCI","authors":"K.A.M. Soliman","doi":"10.1109/NRSC.1998.711494","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711494","url":null,"abstract":"The bit error rate (BER) performance of Gaussian minimum shift keying (GMSK) signals with one-bit differential detection and offset receiver diversity in restricted bandwidth (BW) fast Rayleigh channels is studied. The performance of the proposed system is analyzed in a two-path Rayleigh fading channel taking into account frequency-selective, carrier random frequency shift, intersymbol interference (ISI), Doppler frequency shift, cochannel interference (CCI) and additive white Gaussian noise (AWGN), while the receiver (Rx) rejects a specified amount of adjacent channel interference (ACI). For the interference, we adopt a model which includes N statistically independent faded CCI. Numerical results show that the Rx structure under consideration has the potential to combat the effect of frequency shifts, and yields a superior performance where the conventional differential detector (CDD) becomes unusable.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130534183","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
Computer simulation of Reed-Solomon codes in FCMA system FCMA系统中Reed-Solomon码的计算机仿真
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711487
M. Marie, A. Abou El-Azm, M. Ali
{"title":"Computer simulation of Reed-Solomon codes in FCMA system","authors":"M. Marie, A. Abou El-Azm, M. Ali","doi":"10.1109/NRSC.1998.711487","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711487","url":null,"abstract":"Frequency comb multiple access (FCMA) is a new system that belongs to the random multiple access family. The main drawback of this system is that the spectral efficiency is very low and it requires high transmitted power. This can be overcomed by using non-binary codes (e.g. RS codes). This paper presents the computer simulation of a coded FCMA system in the presence of multiple access interference (MAI) and white Gaussian noise (AWGN). Either the source rate or the number of frequency divisions should be reduced to overcome the bandwidth constraint. The obtained results showed that at the same transmitted power the spectral efficiency can be doubled, also the transmitted power can be reduced approximately by 5 dB if the spectral efficiency is kept constant.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124434591","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
Analysis of parabolic and hyperbolic cylindrical reflector antennas using the method of moments 用矩量法分析抛物线和双曲柱面反射天线
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711449
Y.H. Elkamchouchi, H. Elkamchouchi, S. El-Khamy
{"title":"Analysis of parabolic and hyperbolic cylindrical reflector antennas using the method of moments","authors":"Y.H. Elkamchouchi, H. Elkamchouchi, S. El-Khamy","doi":"10.1109/NRSC.1998.711449","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711449","url":null,"abstract":"The method of moments (MoM) is used to analyze two proposed types of cylindrical reflector antennas, namely, the parabolic and hyperbolic reflectors. The surface of each of the reflectors is represented by a set of parallel grids, and the feeder element is a half wavelength dipole. The radiation characteristics, input impedance, gain and radiation fields are considered. The effects of changing the frequency on the antenna performance are also considered. The obtained results show that both antennas are very promising for operation in the VHF, UHF and SHF frequency ranges.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123335897","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
Performance analysis of 49-QPRS through nonlinear satellite channel in the presence of additive white Gaussian noise 加性高斯白噪声下49-QPRS非线性卫星信道性能分析
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711490
M. I. Badr, R. El-Zanfally
{"title":"Performance analysis of 49-QPRS through nonlinear satellite channel in the presence of additive white Gaussian noise","authors":"M. I. Badr, R. El-Zanfally","doi":"10.1109/NRSC.1998.711490","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711490","url":null,"abstract":"This paper is concerned with the analytical performance analysis and evaluation of 49-ary quadrature partial response signaling (QPRS) when transmitted through a nonlinear satellite channel in the presence of additive white Gaussian noise (AWGN) in both the uplink and downlink channels. The main source of the nonlinearity is the traveling wave tube amplifier (TWTA) on-board the satellite. The transponder nonlinearities considered in this paper are due to: input amplitude-output amplitude conversion (AM/AM) and input amplitude-output phase conversion (AM/PM). The results are determined in terms of the dependence of average symbol error probability (Pe) upon the uplink and downlink signal-to-noise ratios (SNR) at different values of input back-off (BO) from saturation operation of the TWTA. Finally, the results showed that the appropriate values of the threshold levels and compensation phases at the receiver are highly correlated and can only be arrived at by minimizing the average symbol error probabilities.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"11 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123657616","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
Adaptive cancellation of a periodic interference using the HGLS adaptation algorithm 基于HGLS自适应算法的周期干扰自适应消除
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711518
E. Soleit
{"title":"Adaptive cancellation of a periodic interference using the HGLS adaptation algorithm","authors":"E. Soleit","doi":"10.1109/NRSC.1998.711518","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711518","url":null,"abstract":"A proposal of a hyperstable gradient least squares (HGLS) adaptive recursive filter is presented in this paper. The adaptive recursive filter stability is guaranteed during the adaptation process according to the hyperstability theorem. The HGLS algorithm is used to update the coefficients of the adaptive noise canceller to remove periodic interference that is combined with desired signals. The HGLS adaptive noise canceller provides significant improvements in the output signal to noise ratio for a wide spectrum of the interference signals.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122515048","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
Base station selection algorithms in microcellular mobile radio networks 微蜂窝移动无线网络中的基站选择算法
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711472
M. Nofal, M. An, R. Steele
{"title":"Base station selection algorithms in microcellular mobile radio networks","authors":"M. Nofal, M. An, R. Steele","doi":"10.1109/NRSC.1998.711472","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711472","url":null,"abstract":"Base station (BS) selection algorithms that dynamically adapt to teletraffic variations in the microcellular environment are introduced. Though overlapping areas usually exist between BS coverage, we redirect teletraffic away from heavily loaded cells. We present three algorithms. The first is the directed retry with handover priority algorithm that recognises blocking of a call and searches for alternative BSs. The second is the BS load equalization algorithm that directs new calls initiated in the overlapping area to be made to the BS with most available channels. The third is the rearrangement upon blocking algorithm that clears a connection from the current saturated BS in order to allow the mobile station in trouble to be served. The performance of these algorithms is evaluated using event driven computer simulations in addition to an analytical queueing model. It is found that in situations where radio coverage of adjacent cells is overlapped, the proposed algorithms yield higher system capacity.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127421633","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
Accurate estimation of electron velocity overshoot in sub-quarter micron silicon structures and MOSFET devices 亚四分之一微米硅结构和MOSFET器件中电子速度超调的精确估计
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711503
M. El-Saba
{"title":"Accurate estimation of electron velocity overshoot in sub-quarter micron silicon structures and MOSFET devices","authors":"M. El-Saba","doi":"10.1109/NRSC.1998.711503","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711503","url":null,"abstract":"In this paper we show that the exaggerated electron-velocity overshoot in sub-quarter micron structures, which has been reported in the literature as a drawback of the hydrodynamic model (HDM), is primarily related to inaccurate modeling of electron drift mobility as a function of electron temperature. We show that expressing the electron drift mobility as a function of electron energy reduces such unphysical results.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125327621","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
Analysis of CMOS current conveyor CMOS电流输送机分析
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711510
M. Abou El-Ela, H. F. Ragaei, S. Kayed, F. Soliman
{"title":"Analysis of CMOS current conveyor","authors":"M. Abou El-Ela, H. F. Ragaei, S. Kayed, F. Soliman","doi":"10.1109/NRSC.1998.711510","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711510","url":null,"abstract":"Current conveyors have been used as a basic building block in a variety of electronic circuit in instrumentation and communication systems. Today they replace the conventional opamp in so many applications such as active filters, analog signal processing, and A/D, D/A converters. In this work, the advantages and disadvantages of current conveyors are outlined and analyzed. A simple positive CMOS second generation current conveyor (CCII+) is introduced and analyzed. Simulation results using SPICE with standard 1.2 /spl mu/m technology are also presented.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125679517","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
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