Pub Date : 2011-03-07DOI: 10.1109/RWS.2011.5725481
P. Cruz, N. Carvalho
This paper proposes an architecture to increase the dynamic range of the analog to digital signal conversion. Preferably, such an architecture will witness more applicability in the wideband digital receivers for software-defined radio. It is based in passive circuitry followed by two analog-to-digital converters that acquire the incoming analog signal, and then digital signal processing is applied to reconstruct the signal. We will demonstrate clear improvements related to the case when only one analog-to-digital converter is used. Also, this architecture will be validated through several simulations, in which it will be subjected to common modulated signals that confirms the validity of such an architecture.
{"title":"Enhanced architecture to increase the dynamic range of SDR receivers","authors":"P. Cruz, N. Carvalho","doi":"10.1109/RWS.2011.5725481","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725481","url":null,"abstract":"This paper proposes an architecture to increase the dynamic range of the analog to digital signal conversion. Preferably, such an architecture will witness more applicability in the wideband digital receivers for software-defined radio. It is based in passive circuitry followed by two analog-to-digital converters that acquire the incoming analog signal, and then digital signal processing is applied to reconstruct the signal. We will demonstrate clear improvements related to the case when only one analog-to-digital converter is used. Also, this architecture will be validated through several simulations, in which it will be subjected to common modulated signals that confirms the validity of such an architecture.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122412293","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725419
V. G. Kononov, C. Balanis
Multipath modeling is presented using infinitely long cylinders. It is shown that the known stochastic fading models, Rayleigh and Rician, can be obtained by treating multipath deterministically, that is, by solving the electromagnetic scattering problem.
{"title":"Multipath modeling using canonical scatterers","authors":"V. G. Kononov, C. Balanis","doi":"10.1109/RWS.2011.5725419","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725419","url":null,"abstract":"Multipath modeling is presented using infinitely long cylinders. It is shown that the known stochastic fading models, Rayleigh and Rician, can be obtained by treating multipath deterministically, that is, by solving the electromagnetic scattering problem.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116933106","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725446
Kiyoshige Kojima, Naomi Shiga, T. Matsuo, R. Mori, Y. Hayashi, Mitsushi Tada, T. Jimbo
In this paper we present a thin organic resin substrate material (called X-R) for RF modules and high frequency devices, which has a very low insertion loss property. The X-R material possesses the same dielectric constant (Dk=7.0) and the same loss (Df=0.003) as LTCC, and shows low TCF (temperature coefficient of resonant frequency) (5.9ppm/deg.C at 1GHz). We have proven that embedded band-pass filter based on the X-R shows very low insertion loss (S21) performance, which is promising for RF modules and high frequency devices
{"title":"High performance organic substrate with high dielectric constant, low loss, and low temperature coefficient of resonant frequency for high frequency RF module applications","authors":"Kiyoshige Kojima, Naomi Shiga, T. Matsuo, R. Mori, Y. Hayashi, Mitsushi Tada, T. Jimbo","doi":"10.1109/RWS.2011.5725446","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725446","url":null,"abstract":"In this paper we present a thin organic resin substrate material (called X-R) for RF modules and high frequency devices, which has a very low insertion loss property. The X-R material possesses the same dielectric constant (Dk=7.0) and the same loss (Df=0.003) as LTCC, and shows low TCF (temperature coefficient of resonant frequency) (5.9ppm/deg.C at 1GHz). We have proven that embedded band-pass filter based on the X-R shows very low insertion loss (S21) performance, which is promising for RF modules and high frequency devices","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116779261","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725413
S. Sud
Asynchronous CDMA systems require that the base station synchronizes with each user's length N spreading code to despread and recover the modulated data. This problem is usually solved by a brute-force method of correlating the incoming signal with the spreading code. In this paper we present a method of obtaining chip-level synchronization for all K users of the system simultaneously. The approach derives from the transpose domain filter (TDF) method, which has been used to obtain bit timing of synchronous CDMA users. We propose a modified TDF to obtain chip timing for asynchronous users, whose solution is implemented efficiently using a parallel bank of multistage Wiener filters (MWFs) for all K users simultaneously. We demonstrate the effectiveness of the technique in giving near 100% success in timing estimation for heavily loaded systems when Eb/N0 ≥ 0 dB and enough bits, M, e.g. M ≥ 16N, is used to obtain the estimate.
{"title":"Multiuser chip timing recovery in asynchronous CDMA systems using a transpose domain filter","authors":"S. Sud","doi":"10.1109/RWS.2011.5725413","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725413","url":null,"abstract":"Asynchronous CDMA systems require that the base station synchronizes with each user's length N spreading code to despread and recover the modulated data. This problem is usually solved by a brute-force method of correlating the incoming signal with the spreading code. In this paper we present a method of obtaining chip-level synchronization for all K users of the system simultaneously. The approach derives from the transpose domain filter (TDF) method, which has been used to obtain bit timing of synchronous CDMA users. We propose a modified TDF to obtain chip timing for asynchronous users, whose solution is implemented efficiently using a parallel bank of multistage Wiener filters (MWFs) for all K users simultaneously. We demonstrate the effectiveness of the technique in giving near 100% success in timing estimation for heavily loaded systems when Eb/N0 ≥ 0 dB and enough bits, M, e.g. M ≥ 16N, is used to obtain the estimate.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117257902","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725478
C. Lederer, M. Huemer
Second-order intermodulation products are produced by non-linearities in the transfer functions of the receiver's signal processing blocks. Especially in homodyne receivers the second-order intermodulations are problematic since they are convolved into baseband and overlap the wanted signal. In this paper a Least-Mean-Square (LMS) adaptive filter approach to estimate and cancel the transmitter (TX) induced second-order intermodulation distortion (IMD2) in the digital domain is presented. The performance of the proposed cancellation method and its dependency on the number of used filter coefficients is verified on measured data of the digital front end (DFE) output of an UMTS transceiver chip.
{"title":"LMS based digital cancellation of second-order TX intermodulation products in homodyne receivers","authors":"C. Lederer, M. Huemer","doi":"10.1109/RWS.2011.5725478","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725478","url":null,"abstract":"Second-order intermodulation products are produced by non-linearities in the transfer functions of the receiver's signal processing blocks. Especially in homodyne receivers the second-order intermodulations are problematic since they are convolved into baseband and overlap the wanted signal. In this paper a Least-Mean-Square (LMS) adaptive filter approach to estimate and cancel the transmitter (TX) induced second-order intermodulation distortion (IMD2) in the digital domain is presented. The performance of the proposed cancellation method and its dependency on the number of used filter coefficients is verified on measured data of the digital front end (DFE) output of an UMTS transceiver chip.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114228752","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725414
E. McCune
While the technique of direct digital frequency synthesis (DDFS) is well known, the mechanisms active in the generation of non-harmonic spurious output signals are not so well known. Here the significant spurious generating processes active in a DDFS design are illustrated. Use of this information in debugging a DDFS design to fundamentally reduce power in spurious signals is discussed. Thus this work specifically excludes dithering, a spurious power spreading process, from the techniques considered.
{"title":"Spurious mechanisms and debugging in direct digital synthesis","authors":"E. McCune","doi":"10.1109/RWS.2011.5725414","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725414","url":null,"abstract":"While the technique of direct digital frequency synthesis (DDFS) is well known, the mechanisms active in the generation of non-harmonic spurious output signals are not so well known. Here the significant spurious generating processes active in a DDFS design are illustrated. Use of this information in debugging a DDFS design to fundamentally reduce power in spurious signals is discussed. Thus this work specifically excludes dithering, a spurious power spreading process, from the techniques considered.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126864647","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725511
D. Ahn, Songcheol Hong
This paper proposes a novel analog FIR low pass filtering scheme. Instead of using one FIR filter with large number of coefficients, three cascaded FIR filters with the smaller number of coefficients are used. This scheme is robust against to the coefficient error induced by actual fabrication processes. In addition, the reduced number of switches leads to the small chip area. These allow the small and accurate analog filter to be implemented with deep-submicron digital CMOS process. This filter has a stop band rejection of more than 40 dB, IIP3 of +12.5 dBm, while consuming 1.2 mW power from 1.2 V power supply at sampling frequency of 36 MHz. The core chip area is 0.23 mm2.
{"title":"A low cost analog FIR channel select filter for wireless receiver","authors":"D. Ahn, Songcheol Hong","doi":"10.1109/RWS.2011.5725511","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725511","url":null,"abstract":"This paper proposes a novel analog FIR low pass filtering scheme. Instead of using one FIR filter with large number of coefficients, three cascaded FIR filters with the smaller number of coefficients are used. This scheme is robust against to the coefficient error induced by actual fabrication processes. In addition, the reduced number of switches leads to the small chip area. These allow the small and accurate analog filter to be implemented with deep-submicron digital CMOS process. This filter has a stop band rejection of more than 40 dB, IIP3 of +12.5 dBm, while consuming 1.2 mW power from 1.2 V power supply at sampling frequency of 36 MHz. The core chip area is 0.23 mm2.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122647145","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725418
V. G. Kononov, C. Balanis, C. Birtcher
When computing the permeability tensor of the ferrite material, it is often assumed that the internal magnetic field is uniform. In this paper we compare simulations and measurements of the input impedance of a ferrite-loaded CBS antenna based on the non-uniform field distribution with those based on the uniform field distribution.
{"title":"Field distribution modeling and measurements of ferrite-loaded CBS antennas","authors":"V. G. Kononov, C. Balanis, C. Birtcher","doi":"10.1109/RWS.2011.5725418","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725418","url":null,"abstract":"When computing the permeability tensor of the ferrite material, it is often assumed that the internal magnetic field is uniform. In this paper we compare simulations and measurements of the input impedance of a ferrite-loaded CBS antenna based on the non-uniform field distribution with those based on the uniform field distribution.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"40 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123405555","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725480
Christoph Kandziora, R. Weigel
This paper presents a novel concept for a GNSS receiver for mobile devices based on the single-shot receiver concept. In comparison to the common single-shot receiver the amount of computational hardware is significantly reduced by an estimation of the time of signal reception. This allows an a-priori estimation of the code-phase of the satellites in view. The synchronisation to the time code signal must be better than 1 ms for GPS-In-Orbit-Vehicles(IOVs) to take effect which is here realized by using the german DCF77 signal with an precision of 250 ns under ideal circumstances. Regarding all uncertainties in time and the amount of signal processing power required for the time synchronisation the computational effort for the advanced single-shot receiver can be cut down by a factor of two.
本文提出了一种基于单次发射接收机概念的移动设备GNSS接收机的新概念。与普通的单次发射接收机相比，通过估计信号接收时间大大减少了计算硬件的数量。这样就可以对观测卫星的码相进行先验估计。gps在轨飞行器(gps - in - orbit vehicles, IOVs)与时间码信号的同步必须大于1 ms才能生效，本文采用德国DCF77信号实现同步，理想情况下同步精度为250 ns。考虑到时间的所有不确定性和时间同步所需的信号处理能力，先进的单次发射接收机的计算工作量可以减少两倍。
{"title":"Concept for a time-code signal assisted single-shot receiver","authors":"Christoph Kandziora, R. Weigel","doi":"10.1109/RWS.2011.5725480","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725480","url":null,"abstract":"This paper presents a novel concept for a GNSS receiver for mobile devices based on the single-shot receiver concept. In comparison to the common single-shot receiver the amount of computational hardware is significantly reduced by an estimation of the time of signal reception. This allows an a-priori estimation of the code-phase of the satellites in view. The synchronisation to the time code signal must be better than 1 ms for GPS-In-Orbit-Vehicles(IOVs) to take effect which is here realized by using the german DCF77 signal with an precision of 250 ns under ideal circumstances. Regarding all uncertainties in time and the amount of signal processing power required for the time synchronisation the computational effort for the advanced single-shot receiver can be cut down by a factor of two.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122260071","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725504
Jian Liu, Lin Lin, Xin Wang, H Zhao, He Tang, Q. Fang, Albert Z. H. Wang, Liwu Yang, Haolu Xie, S. Fan, B. Zhao, Gary Zhang, Xingang Wang
This paper reports a tunable low triggering voltage, dual-directional SCR ESD protection structure in CMOS for RF ICs. A new embedded gate-coupling technique is used to reduce and adjust its triggering voltage. Experiment shows a low discharging resistance of ∼0.26Ω, low leakage current of ∼0.19nA, low parasitic capacitance of ∼150fF and ultra fast response time of ∼100pS. This structure achieves ESD protection of >9.20kV HBM and >500V CDM for a 90µm device. A high ESD protection to Si ratio of ESDV∼8.17V/µm2 is obtained for RF IC applications.
{"title":"Tunable low-voltage dual-directional ESD protection for RFICs","authors":"Jian Liu, Lin Lin, Xin Wang, H Zhao, He Tang, Q. Fang, Albert Z. H. Wang, Liwu Yang, Haolu Xie, S. Fan, B. Zhao, Gary Zhang, Xingang Wang","doi":"10.1109/RWS.2011.5725504","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725504","url":null,"abstract":"This paper reports a tunable low triggering voltage, dual-directional SCR ESD protection structure in CMOS for RF ICs. A new embedded gate-coupling technique is used to reduce and adjust its triggering voltage. Experiment shows a low discharging resistance of ∼0.26Ω, low leakage current of ∼0.19nA, low parasitic capacitance of ∼150fF and ultra fast response time of ∼100pS. This structure achieves ESD protection of >9.20kV HBM and >500V CDM for a 90µm device. A high ESD protection to Si ratio of ESDV∼8.17V/µm<sup>2</sup> is obtained for RF IC applications.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134296117","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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