Pub Date : 2002-05-21DOI: 10.1109/UWBST.2002.1006328
Yao Ma, F. Chin, B. Kannan, S. Pasupathy
The ultra wide-band time-hopping communications are expected to be a practical scheme in the near future, yet the acquisition analysis of the UWB signals over multipath channels has not been adequately addressed. We propose and analyze a non-consecutive search and global maximum-selection and threshold crossing (MAX/TC) algorithm for the acquisition of a UWB signal over a multiple-access multipath fading channel. The correlator output statistics and the acquisition performance are accurately analyzed, taking into account the effects of multiple interferers, multipath fading, data rate, signal-to-interference-and-noise (SINR) ratio, etc. Some simulation results are presented.
{"title":"Acquisition performance of an ultra wide-band communications system over a multiple-access fading channel","authors":"Yao Ma, F. Chin, B. Kannan, S. Pasupathy","doi":"10.1109/UWBST.2002.1006328","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006328","url":null,"abstract":"The ultra wide-band time-hopping communications are expected to be a practical scheme in the near future, yet the acquisition analysis of the UWB signals over multipath channels has not been adequately addressed. We propose and analyze a non-consecutive search and global maximum-selection and threshold crossing (MAX/TC) algorithm for the acquisition of a UWB signal over a multiple-access multipath fading channel. The correlator output statistics and the acquisition performance are accurately analyzed, taking into account the effects of multiple interferers, multipath fading, data rate, signal-to-interference-and-noise (SINR) ratio, etc. Some simulation results are presented.","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115264288","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 : 2002-05-21DOI: 10.1109/UWBST.2002.1006374
Liuqing Yang, G. Giannakis
Impulse radio (IR) has received increasing interest for multiple access (MA). Operating in dense multipath environments. IRMA systems are affected by the multiple user interference (MUI) and intersymbol interference (ISI). Analog IRMA utilizes random time-hopping codes to mitigate such adverse effects statistically. In this paper, we develop an all-digital IRMA scheme that relies on multi-stage block-spreading (MS-BS) to eliminate MUI deterministically, regardless of ISI multipath effects. Unlike conventional IRMA systems. our proposed MS-BS-IRMA system exhibits no degradation in performance when accommodating a large number of users.
{"title":"Impulse radio multiple access through ISI channels with multi-stage block-spreading","authors":"Liuqing Yang, G. Giannakis","doi":"10.1109/UWBST.2002.1006374","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006374","url":null,"abstract":"Impulse radio (IR) has received increasing interest for multiple access (MA). Operating in dense multipath environments. IRMA systems are affected by the multiple user interference (MUI) and intersymbol interference (ISI). Analog IRMA utilizes random time-hopping codes to mitigate such adverse effects statistically. In this paper, we develop an all-digital IRMA scheme that relies on multi-stage block-spreading (MS-BS) to eliminate MUI deterministically, regardless of ISI multipath effects. Unlike conventional IRMA systems. our proposed MS-BS-IRMA system exhibits no degradation in performance when accommodating a large number of users.","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125801680","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 : 2002-05-21DOI: 10.1109/UWBST.2002.1006318
Zhiqiang Wu, Fang Zhu, C. Nassar
Ultra-wide bandwidth (UWB) systems have emerged as a strong candidate for high-throughput short range wireless communications. Because of the UWB systems' fine time resolution properties, a large path diversity gain can be exploited. However, to exploit this path diversity gain while avoiding inter symbol interference between data bits, the repetition period of data-modulated pulses must be larger than the time delay spread of multipath fading channels. This significantly reduces the throughput of UWB systems (making it spectrally inefficient, e.g., 0.05 b/s/Hz). If a larger throughput is desired (e.g.. a throughput requiring information-bearing pulses separated by less than the time delay spread), the BER performance degrades rapidly. In this work, we propose a novel pulse waveform referred to as the carrier interferometry (CI) pulse waveform for use in UWB systems: CI supports significant increases fit throughput with negligible performance loss. Specifically, the CI pulse waveform corresponds to the superpositioning of N orthogonal subcarriers. At the receiver side, the received pulse is decomposed into its subcarriers and recombined to exploit diversity in the frequency domain. This frequency domain processing provides resistance to inter symbol interference (from data-modulated pulses positioned within the delay spread of the channel). As a direct result, much higher throughput is supported with small performance loss when CI pulse waveforms are employed. Simulation results over indoor channels confirm that the novel CI-UWB system is capable of significantly outperforming current UWB systems: at a fixed BER performance level of 10/sup -3/, the proposed system can provide up to 64 times the data rate of current time domain UWB systems.
{"title":"High performance ultra-wide bandwidth systems via novel pulse shaping and frequency domain processing","authors":"Zhiqiang Wu, Fang Zhu, C. Nassar","doi":"10.1109/UWBST.2002.1006318","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006318","url":null,"abstract":"Ultra-wide bandwidth (UWB) systems have emerged as a strong candidate for high-throughput short range wireless communications. Because of the UWB systems' fine time resolution properties, a large path diversity gain can be exploited. However, to exploit this path diversity gain while avoiding inter symbol interference between data bits, the repetition period of data-modulated pulses must be larger than the time delay spread of multipath fading channels. This significantly reduces the throughput of UWB systems (making it spectrally inefficient, e.g., 0.05 b/s/Hz). If a larger throughput is desired (e.g.. a throughput requiring information-bearing pulses separated by less than the time delay spread), the BER performance degrades rapidly. In this work, we propose a novel pulse waveform referred to as the carrier interferometry (CI) pulse waveform for use in UWB systems: CI supports significant increases fit throughput with negligible performance loss. Specifically, the CI pulse waveform corresponds to the superpositioning of N orthogonal subcarriers. At the receiver side, the received pulse is decomposed into its subcarriers and recombined to exploit diversity in the frequency domain. This frequency domain processing provides resistance to inter symbol interference (from data-modulated pulses positioned within the delay spread of the channel). As a direct result, much higher throughput is supported with small performance loss when CI pulse waveforms are employed. Simulation results over indoor channels confirm that the novel CI-UWB system is capable of significantly outperforming current UWB systems: at a fixed BER performance level of 10/sup -3/, the proposed system can provide up to 64 times the data rate of current time domain UWB systems.","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128681506","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 : 2002-05-21DOI: 10.1109/UWBST.2002.1006337
C. Bi, J. Hui
We propose the use of multiple receive antennas for ultra-wide band impulse radio systems, using pattern code modulation (PACM). We show that we can obtain a linear growth in transmission capacity if we use multiple receivers, provided that these receivers are separated sufficiently. To analyze such a channel capacity of the impulse radio system, we model the multiple access interference as a filtered Poisson shot noise process. We use a convolution formula to study the amplitude distribution, and therefore find the probability of false and miss detection of a CDMA pattern. We find the capacity bounds and give some example, we can see that they converge and the bound are quire tight. Using the formula we get, we continue to show that we can increase the multiple access capacity linearly with the number of receive antennas.
{"title":"Multiple access capacity for ultra-wide band radio with multi-antenna receivers","authors":"C. Bi, J. Hui","doi":"10.1109/UWBST.2002.1006337","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006337","url":null,"abstract":"We propose the use of multiple receive antennas for ultra-wide band impulse radio systems, using pattern code modulation (PACM). We show that we can obtain a linear growth in transmission capacity if we use multiple receivers, provided that these receivers are separated sufficiently. To analyze such a channel capacity of the impulse radio system, we model the multiple access interference as a filtered Poisson shot noise process. We use a convolution formula to study the amplitude distribution, and therefore find the probability of false and miss detection of a CDMA pattern. We find the capacity bounds and give some example, we can see that they converge and the bound are quire tight. Using the formula we get, we continue to show that we can increase the multiple access capacity linearly with the number of receive antennas.","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115840429","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 : 2002-05-21DOI: 10.1109/UWBST.2002.1006359
Robert Fleniing, C. Kushner, Roberts, Uday Nandiwada
Ultra-wideband (UWB) signals as implemented in our localizers provide a foundation for highly accurate methods of 3D position determination using precise ranging between any two nodes. In a large, distributed network of nodes, the time required for all nodes to acquire each other is of paramount importance. We have developed a method of rapid acquisition that allows two nodes to acquire each other in a fraction of the time afforded by other methods. We utilize a beacon/listener technique using Kasami sequences and divide-and-conquer algorithms to effect acquisitions in less than a second. We discuss our rapid acquisition process in this paper.
{"title":"Rapid acquisition for ultra-wideband localizers","authors":"Robert Fleniing, C. Kushner, Roberts, Uday Nandiwada","doi":"10.1109/UWBST.2002.1006359","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006359","url":null,"abstract":"Ultra-wideband (UWB) signals as implemented in our localizers provide a foundation for highly accurate methods of 3D position determination using precise ranging between any two nodes. In a large, distributed network of nodes, the time required for all nodes to acquire each other is of paramount importance. We have developed a method of rapid acquisition that allows two nodes to acquire each other in a fraction of the time afforded by other methods. We utilize a beacon/listener technique using Kasami sequences and divide-and-conquer algorithms to effect acquisitions in less than a second. We discuss our rapid acquisition process in this paper.","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134330692","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 : 2002-05-21DOI: 10.1109/UWBST.2002.1006356
Liuqing Yang, G. Giannakis
Impulse radio (IR) ultrawide band systems have well documented advantages for low-power peer-to-peer and multiple access communications. Space-time (ST) coding on the other hand, has gained popularity as an effective means of boosting rates and performance. Existing IR transmitters rely on a single antenna, while ST coders have so far focused on digital linearly modulated transmissions. In this paper, we develop an orthogonal ST coding scheme for the analog nonlinearly (pulse-position) modulated multi-antenna IR system. We show that the resulting analog noncoherent detector is equivalent to an existing digital ST decoder possessing maximum likelihood optimality. Simulations testing peer-to-peer and multi-access IR scenarios confirm considerable increase in both bit-error-rate performance and number of users that can be accommodated, when wedding ST coding with IR.
{"title":"Space-time coding for impulse radio","authors":"Liuqing Yang, G. Giannakis","doi":"10.1109/UWBST.2002.1006356","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006356","url":null,"abstract":"Impulse radio (IR) ultrawide band systems have well documented advantages for low-power peer-to-peer and multiple access communications. Space-time (ST) coding on the other hand, has gained popularity as an effective means of boosting rates and performance. Existing IR transmitters rely on a single antenna, while ST coders have so far focused on digital linearly modulated transmissions. In this paper, we develop an orthogonal ST coding scheme for the analog nonlinearly (pulse-position) modulated multi-antenna IR system. We show that the resulting analog noncoherent detector is equivalent to an existing digital ST decoder possessing maximum likelihood optimality. Simulations testing peer-to-peer and multi-access IR scenarios confirm considerable increase in both bit-error-rate performance and number of users that can be accommodated, when wedding ST coding with IR.","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130722125","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 : 2002-05-21DOI: 10.1109/UWBST.2002.1006326
N. van Stralen, A. Dentinger, K. Welles, R. Gaus, R. Hoctor, H. Tomlinson
This paper describes the experimental hardware design and implementation for a delay hopped transmitted reference communication system. The hardware is designed to generate the delay hopped transmitted reference signal for a number of experimental conditions. It can be used either in an ultra wideband pulse mode, ultra wideband noise mode, or in a narrowband mode. We use the experimental hardware setup to conduct link experiments with a delay hopped transmitted reference communication system. Experiments were conducted in an indoor multipath environment to test the viability of delay hopped transmitted reference for short-range indoor communications. The experimental results presented demonstrate that this modulation format is capable of transmitting data short range indoors without line of sight transmission path with minimal transmitted RF power.
{"title":"Delay hopped transmitted reference experimental results","authors":"N. van Stralen, A. Dentinger, K. Welles, R. Gaus, R. Hoctor, H. Tomlinson","doi":"10.1109/UWBST.2002.1006326","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006326","url":null,"abstract":"This paper describes the experimental hardware design and implementation for a delay hopped transmitted reference communication system. The hardware is designed to generate the delay hopped transmitted reference signal for a number of experimental conditions. It can be used either in an ultra wideband pulse mode, ultra wideband noise mode, or in a narrowband mode. We use the experimental hardware setup to conduct link experiments with a delay hopped transmitted reference communication system. Experiments were conducted in an indoor multipath environment to test the viability of delay hopped transmitted reference for short-range indoor communications. The experimental results presented demonstrate that this modulation format is capable of transmitting data short range indoors without line of sight transmission path with minimal transmitted RF power.","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134469570","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 : 2002-05-21DOI: 10.1109/UWBST.2002.1006345
I. Immoreev, P.G.S.D.V. Fedotov
The questions of detection of radar-tracking signals are discussed, which parameters are unknown. The method for detection of radar signals which parameters are unknown is considered. The method is based on correlation processing of signals received in the adjacent periods of sounding - the interleaved periodic correlation processing (IPCP).
{"title":"Detection of UWB signals reflected from complex targets","authors":"I. Immoreev, P.G.S.D.V. Fedotov","doi":"10.1109/UWBST.2002.1006345","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006345","url":null,"abstract":"The questions of detection of radar-tracking signals are discussed, which parameters are unknown. The method for detection of radar signals which parameters are unknown is considered. The method is based on correlation processing of signals received in the adjacent periods of sounding - the interleaved periodic correlation processing (IPCP).","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122134781","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 : 2002-05-21DOI: 10.1109/UWBST.2002.1006330
B. Kannan, Yao Ma, F. Chin
We propose a new transmit energy optimization method in UWB (ultra wideband) multiple access communications in multipath fading channels. We consider a packetized transmission mode, where each packet contains N/sub pre/ overhead symbols for synchronization purpose and N/sub B/ symbols for data transmission. The effect of packet update rate (N/sub R/), decimation factor (D), number of users (K/sub all/) and the length of PN-sequence (N/sub s/) on the transmitted energy are analyzed. Extensive numerical results are presented to show how these parameters can be chosen to obtain an optimum transmit energy for a given probability of acquisition.
{"title":"Optimizing the transmit energy in UWB multiple access communications in multipath fading channels","authors":"B. Kannan, Yao Ma, F. Chin","doi":"10.1109/UWBST.2002.1006330","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006330","url":null,"abstract":"We propose a new transmit energy optimization method in UWB (ultra wideband) multiple access communications in multipath fading channels. We consider a packetized transmission mode, where each packet contains N/sub pre/ overhead symbols for synchronization purpose and N/sub B/ symbols for data transmission. The effect of packet update rate (N/sub R/), decimation factor (D), number of users (K/sub all/) and the length of PN-sequence (N/sub s/) on the transmitted energy are analyzed. Extensive numerical results are presented to show how these parameters can be chosen to obtain an optimum transmit energy for a given probability of acquisition.","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128386955","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 : 2002-05-21DOI: 10.1109/UWBST.2002.1006389
Antonio Fernandez-Garcia, Sergey Makarov, K. Pahlavan
A numerical study, based on the frequency-domain method of moments (MoM), is made of wideband properties of a slot linearly-polarized antenna, patented by Time Domain Inc. The antenna-to-antenna transfer function is evaluated over the band 12.5 MHz to 6.25 GHz. Predictions are made for the received voltage at different durations of the input voltage pulse. It is stated that the investigated antenna type is best suited for 1 ns wide pulses. When the pulse duration is smaller or greater than this value, the antenna performance declines.
{"title":"Matlab-based simulation of a slot antenna for pulse radiation","authors":"Antonio Fernandez-Garcia, Sergey Makarov, K. Pahlavan","doi":"10.1109/UWBST.2002.1006389","DOIUrl":"https://doi.org/10.1109/UWBST.2002.1006389","url":null,"abstract":"A numerical study, based on the frequency-domain method of moments (MoM), is made of wideband properties of a slot linearly-polarized antenna, patented by Time Domain Inc. The antenna-to-antenna transfer function is evaluated over the band 12.5 MHz to 6.25 GHz. Predictions are made for the received voltage at different durations of the input voltage pulse. It is stated that the investigated antenna type is best suited for 1 ns wide pulses. When the pulse duration is smaller or greater than this value, the antenna performance declines.","PeriodicalId":272053,"journal":{"name":"2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125472478","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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