{"title":"Design of a 4-bit 1.4 Gsamples/s low power folding ADC for DS-CDMA UWB transceivers","authors":"R. Thirugnanam, D. Ha, S. S. Choi","doi":"10.1109/ICU.2005.1570045","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570045","url":null,"abstract":"In this paper, we present a CMOS low power folding ADC (analog to digital converter) architecture, which takes advantage of the low resolution requirement of DS-CDMA UWB transceivers to reduce the power consumption. The high sampling rate is achieved by adopting current steering folding amplifiers instead of cross coupled differential pair based folding amplifiers. Our ADC adopts both resistive interpolation and multiplication to fold the input signal, thereby, reducing the number of folding amplifiers required. When this technique is applied to higher resolution converters, the power and area savings will be even more significant. A brief analysis on the operation of the folding amplifier and a systematic method for sizing preamplifiers, folding amplifiers and comparators is presented. The ADC has been designed in 0.13 /spl mu/m IBM CMOS process. Post layout simulation shows that the spurious free dynamic range (SFDR) of our ADC is greater than 24 dB up to 540 MHz at 1.4 GS/s and consumes about 62 mW of power. The results also indicate that the proposed architecture consumes less power and achieves a higher sampling rate than existing folding ADCs.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129573389","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":"Impact of multipath propagation on impulse radio UWB autocorrelation receivers","authors":"K. Witrisal, M. Pausini","doi":"10.1109/ICU.2005.1570036","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570036","url":null,"abstract":"The autocorrelation function of the channel's response to an ultra wideband (UWB) pulse determines the interframe-interference (IFI) in transmitted reference UWB systems employing autocorrelation receiver (AcR) front-ends. The statistical properties of this autocorrelation function were previously derived by the authors, i.e., expressions have been given for the mean and covariance of the correlator outputs in terms of channel parameters. In this paper, these previous results are validated by means of channel measurement data, which allows conclusions on the importance of the various components of a UWB channel model for an AcR in presence of inter-symbol-interference or multiple-access-interference. It is demonstrated that a model representing the received prototype pulse-shape, an exponentially decaying power delay profile plus a line-of-sight component, and a homogeneous ray arrival process can largely represent the impact of multipath propagation on the AcR.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130882214","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":"Receiver architectures for UWB-based transmit-only sensor networks","authors":"B. Radunovic, H.L. Truong, M. Weisenhorn","doi":"10.1109/ICU.2005.1570017","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570017","url":null,"abstract":"We are interested in designing a low-cost, ultra-wide-band (UWB) sensor network, that consists of a large number of sensor nodes (SNs), which sense the environment and transmit the resulting data via a wireless radio link to so-called cluster heads (CHs). We focus on low-cost transmit-only SNs; the resulting uncoordinated multiuser-access causes packet collisions. To improve the robustness to packet collision, we propose two novel low-complexity noncoherent receiver architectures: (i) the adaptive CH receiver (CHR) that receives only packets whose signal strength is larger than an adaptive threshold; and (ii) the switching CHR that allows the focus to be switched from a packet of a given SN to a packet from another SN with higher signal strength. Using simulations, we show that the number of received packets during burst periods can be dramatically increased with the adaptive CHR, and even more so with the switching CHR.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130745102","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":"Large error performance of UWB ranging","authors":"Joon-Yong Lee, Sungyul Yoo","doi":"10.1109/ICU.2005.1570004","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570004","url":null,"abstract":"The extremely fine time resolution of the ultra-wideband (UWB) signal enables accurate ranging based on time delay estimation. However, the possibility of an anomalous estimation can be a serious problem for accurate ranging. In the presence of a large number of multiusers, the probability and the variance of a large error can be significant. In this paper, an analysis of the UWB ranging performance in the presence of large error is posed. Both analytical and experimental approaches are taken to evaluate the large error variance in a correlation-based serial search scenario.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"235 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129626970","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":"Inter-symbol interference in high data rate UWB communications using energy detector receivers","authors":"M. E. Sahin, Huseyin Arslan","doi":"10.1109/ICU.2005.1569979","DOIUrl":"https://doi.org/10.1109/ICU.2005.1569979","url":null,"abstract":"Inter-symbol interference (ISI) is known to be a major factor complicating the realization of high data rate ultrawideband (UWB) communications. In the literature, methods for suppressing ISI in UWB systems employing complex receivers exist. In this paper, considering the low cost requirement along with the need for high data rates, we propose a modified, on-off keying (OOK) based low complexity energy detector receiver capable of eliminating ISI. The presented receiver utilizes an ISI cancellation algorithm depending on decision feedback equalization (DFE) and it is advantageous in that it does not suffer from error propagation. The results obtained demonstrate a considerable gain in the symbol detection performance of the UWB system.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129809515","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":"Modified pulse repetition coding boosting energy detector performance in low data rate systems","authors":"F. Troesch, F. Althaus, A. Wittneben","doi":"10.1109/ICU.2005.1570040","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570040","url":null,"abstract":"We consider ultra-wideband impulse radio (UWB-IR) low data rate (LDR) applications where a more complex cluster head (CH) communicates with many basic sensors nodes (SN). At receiver side, noncoherent energy detectors (ED) operating at low sampling clock, i.e., below 300 kHz, are focused. Drawback is that EDs suffer from significant performance losses with respect to coherent receivers. Pulse repetition coding (PRC) is a known solution to increase receiver performance at the expense of more transmit power. But in LDR systems known PRC is very inefficient due to the low receiver sampling clock. Boosting transmit power is not possible due to Federal Communications Commission's (FCC) power constraints. Hence, we present a modified PRC scheme solving this problem. Modified repetition coded binary pulse position modulation (MPRC-BPPM) fully exploits FCC power constraints and for EDs of fixed integration duration is optimal with respect to bit error rate (BER). Furthermore, MPRC-BPPM combined with ED outperforms SRAKE receivers at the expense of more transmit power and makes ED's performance robust against strong channel delay spread variations.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130047123","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 novel adaptive transmit-receive architecture for indoor DS-UWB systems","authors":"Zhonghua Liang, Shihua Zhu, Shaopeng Wang","doi":"10.1109/ICU.2005.1570018","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570018","url":null,"abstract":"In this paper we present a novel transmit-receive scheme based on adaptive receiver for indoor DS-UWB systems. The proposed scheme consists of a transmitter, an adaptive receiver and a switch module which performs switching the link's status from training phase to transmission phase, or vice versa. Furthermore, we evaluate performance on convergence rate, complexity and robustness for three types of adaptive receivers namely LMS, RLS and NLMS, then examine their BER performance under the realistic IEEE 802.15.3a channel model. Simulation results support the theoretical analysis and show that the proposed scheme can achieve higher throughput than a conventional one without loss of BER performance.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133823375","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}
B. Quijano, Á. Álvarez, M. Lobeira, José Luis García García
{"title":"Experimental study on the influence of IR-UWB networks on cellular receivers","authors":"B. Quijano, Á. Álvarez, M. Lobeira, José Luis García García","doi":"10.1109/ICU.2005.1570074","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570074","url":null,"abstract":"Ultra-wideband (UWB) coexistence analysis has been mainly based on theoretical studies, which should be completed with experimental results. Regulatory process is nowadays a hot topic both in Europe and Asia. This paper summarizes the process and results obtained from interference measurements between UWB and selected legacy services, namely GSM, DCS and UMTS. The measurement campaigns have been developed in order to quantify the impact of impulse radio (IR) UWB transmitters on selected services receivers. Protection ratios have been calculated resulting into 7 dB C/IUWB for GSM.9 for DCS and -3.3 dB (I/sub OR//I/sub UWB/) for UMTS up to 64 Kbps.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132891318","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}
D. Harame, X. Wang, B. Jagannathan, J. Perkarik, J. Watts, D. Sheridan, P. Cottrell, D. Greenberg, G. Freeman, K. Newton, M. Graf, E. Mina, A. Joseph, J. Dunn
{"title":"Semiconductor technology choices for ultrawide-band (UWB) systems","authors":"D. Harame, X. Wang, B. Jagannathan, J. Perkarik, J. Watts, D. Sheridan, P. Cottrell, D. Greenberg, G. Freeman, K. Newton, M. Graf, E. Mina, A. Joseph, J. Dunn","doi":"10.1109/ICU.2005.1570078","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570078","url":null,"abstract":"UWB 3.1-10.6 GHz frequency and bandwidth impose stringent performance demands of technology. The standard specifications, system architecture, frequency planning, and circuit topology have a major influence on the technology choice. Two technology choices are RFCMOS and SiGe BiCMOS. RFCMOS strongly increases speed and density with scaling, but analog parameters and layout are a concern. RFCMOS designs also require additional devices, sophisticated models and design kits over digital CMOS. SiGe HBTS have fewer device design tradeoffs due to bandgap-engineered vertical transport. Initial systems are system in a package. The low cost favors CMOS.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124897839","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":"Comparison of UWB auto-correlation and transmitted reference schemes","authors":"A. Rabbachin, I. Oppermann","doi":"10.1109/ICU.2005.1570038","DOIUrl":"https://doi.org/10.1109/ICU.2005.1570038","url":null,"abstract":"This paper provides a theoretical comparison of different multi-pulse schemes for ultra-wideband (UWB) transmitted reference (TR) which utilizes correlation based receivers. The performance comparison is based on a simplified analysis of signal-to-noise ratio (SNR) derivations of receiver output for different signal repetition structures using binary pulse position modulation (BPPM) and binary pulse amplitude modulation (BPAM). The results shows that the best solution is based on pair-wise combination of pulses for which succeeding pulses form the reference for subsequent pulses, significantly outperforms other schemes. The results also show that pulse repetition scheme with equal power pulses in a doublet structure does not provide a good solution from the perspective of SNR degradation.","PeriodicalId":105819,"journal":{"name":"2005 IEEE International Conference on Ultra-Wideband","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127364925","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}