High interference immunity UWB receiver

Examination flow chart of the proposed construction approach. Characteristic features the integral output of the receiver, which gives a correct detection signal due to other channels, which still operate properly and an optimally set threschold.

Рубрика Коммуникации, связь, цифровые приборы и радиоэлектроника
Вид статья
Язык английский
Дата добавления 01.11.2014
Размер файла 169,2 K

Отправить свою хорошую работу в базу знаний просто. Используйте форму, расположенную ниже

Студенты, аспиранты, молодые ученые, использующие базу знаний в своей учебе и работе, будут вам очень благодарны.

Размещено на http://www.allbest.ru/

High interference immunity UWB receiver

Alexander Makhlin

Consideration is given to the alternative UWB signal processing methods, which allow to increase the interference immunity of the system. The problem of interest is the difference in construction of UWB processing technologies and their effect on the receiver parameters. The results of modeling and practical testing are given.

The majority of theoretical and practical works, devoted to the UWB signal processing are concidering the so called correlation receivers. Many authors propose a practical realisation concepts, but most of them are either expensive, or extremely complicated. Also, due to multipath, a correlation receiver is practically not capable of collecting all the existing energy, even though if it is realized in the rake-receiver form.

The idea, underlieing the proposed method of UWB signal processing comes from the simple notion. The matter is that the spectrum of the short pulse is extremely wide. For instance the spectrum width of the 1 nanosecond pulse is 1 GHz. In other words, when the short pulse is transmitted in the air, the integral energy level increases on every frequency of interest. Therefore, analizing the energy level increase in every point of the spectrum, it is possible to unambigously detect the UWB signal presence. But practically, it is easier to analize signals only in several bands. This approach also gives a possibility to simplify the further signal processing, because the short pulse signal, being applied to the bandpass filter input, as a result gives a wide radiopulse in the output. But in order to derive the envelope, the amplitude detector is needed. The modeling results are given on the fig. 1.

Fig. 1

As one could observe, the output pulse is much wider, than the input. This feature allows to catch the UWB pulse with a simple comparator or low speed ADC. Than the strong narrowband interference and a white noise were added. The result is shown on the figure 2.

Fig 2

The is clearly seen that the narrowband interference, deployed outside of the filter band does not affect the output signal much. But the white noise gives a significant influence. There could two major conclusions be made. First is that the proposed construction has a good interferece immunity, in case if several identical channels, tuned to the different frequency bands are utilized. And second, the noise immunity of the proposed technology needs to be increased by means of barker codes, for example. receiver signal channel

Being guided by the abovemntioned notions, the practical model of the receiver was built. The flow chart of the proposed construction approach is introduced on the figure 3.

Fig. 3

The receiver consists of a LNA at the input, the bank of bandpass filters, the energy detecors stage and a stage of comparators, the threshold voltage of which is controlled by the special alghrithm. Further signal processing is performed by an FPGA, which implements a bank of barker code matched filters for each channel and a summer. Also some service functions are performed by an FPGA. Due to presence of both time analisys and frequency analisys, the signal processing performance is highly increased in comparsion with only time domain analisys, like in corellation receivers and all the existing energy is collected.

To verify the reciver capability of reliable detection of UWB signals in the conditions of high narrowband interference, the following experiment has been carried out. The proposed reciever was subjected to the useful UWB signal and narrowband interference. The results are shown on the figure 4.

Размещено на http://www.allbest.ru/

Размещено на http://www.allbest.ru/

Fig. 4

The yellow channel stands for the output of one of the detectors before a comparator (fig. 3). The green channel represents the FPGA processed UWB detection signal output (fig. 3). On the left picture the pulses of interest (yellow signal) can be easily catched by a comparator, whereas on the right picture, the pulses of interest are mixed with a narrowband interference (yellow signal), set at the band of the bandpass filter. In both cases the integral output of the receiver gives a correct detection signal (green signal) due to other channels, which still operate properly and an optimally set threschold.

References

1. Saul Rodriguez Duenas “Design of DS-UWB Transceiver”

2. M.Mezzour “Direct spread\Time hopping Perfomance comparison in a multi-user environment”

3. Aaron Michael Orndorf “Transceiver Design for Ultra-Wideband Communications”

4. Ian Opperman, Matti Hamalainen, Jari Linatti “UWB Theory and applications”

5. M. Anis R.Tielert «Design of UWB pulse radio transceiver using statistical correlation technique in frequency domain».

6. «UWB non-coherent high data rate transceiver» J.B. Dore, S. Mallegol, S.Paquelet, L.M. Aubert, B. Uguen.

7. Youngmin Park and David D. Wentzloff “All-Digital Synthesizable UWB Transmitter Architectures”

Размещено на Allbest.ru

...

Подобные документы

  • Signal is a carrier of new information for the observer. Concept and classification detector signals, their variety and functional features. The detection abilities of different detector’s types, methodology and milestones of their determination.

    контрольная работа [1,1 M], добавлен 27.04.2014

  • Concept and functional features of piezoelectric sensors, the scope of its application. Designing with piezoelectric sensors. Piezo-vibration sensor Parallax 605–00004 and Bosch 608–00112: overview, technical characteristic, accessories, installations.

    контрольная работа [1,1 M], добавлен 27.05.2013

  • Analyses o the current situation on the project and the development of their technical realization. Brief description of the existing zonal area network. Basic requirements for communication lines. Calculation of the required number of channels.

    дипломная работа [771,0 K], добавлен 20.09.2016

  • Signals, channels and communication networks. Enabling Any-to-Any Communication. Next-Generation Mobile Networks. Challenges of Reinventing the Networking Infrastructure. Leading the Way by Providing Innovative Solutions. The review of similar schemes.

    курсовая работа [629,0 K], добавлен 07.12.2015

  • Выбор и расчет трансформатора. Запуск виртуальной установки (мостового) выпрямителя (моста Греца) при работе на асинхронный двигатель. Моделирование трёхфазного инвертора. Просмотр тока в нагрузке с помощью пакета расширения Signal Proccessing Toolbox.

    контрольная работа [3,6 M], добавлен 29.06.2011

  • Constructed and calculated at a three - phase rectifier working on active-inductive load. The review of constructive solutions. Calculation of rectifier working on active-inductive load. Principle of designed scheme operation, construction of the device.

    курсовая работа [413,6 K], добавлен 10.08.2015

  • Device, constructive – technological features, circuit of insert. Conditions of insert of the transistor. Static parameters. Physical processes. Differential coefficient of transmission of a current. Condition a splitting contact. Condition of saturation.

    курсовая работа [129,2 K], добавлен 27.01.2003

  • Investigation of the problem with non-local conditions on the characteristic and on the line of degeneracy . The solution of the modied Cauchy problem with initial data. The solution of singular integral equations. Calculation of the inner integral.

    статья [469,4 K], добавлен 15.06.2015

  • Peculiarities of English nonsense rhymes – limericks and how to use them on the classes of English phonetics. Recommendations of correct translation to save its specific construction. Limericks is represented integral part of linguistic culture.

    статья [17,5 K], добавлен 30.03.2010

  • Turko-Iranian-Muslim element is a integral part of India. Integration of the Mughal regime in Indian society. The theme of paradise in the decorative arts. Features of the mausoleum of Humayun which became samples in construction of monuments of Mughal.

    статья [17,1 K], добавлен 18.05.2013

Работы в архивах красиво оформлены согласно требованиям ВУЗов и содержат рисунки, диаграммы, формулы и т.д.
PPT, PPTX и PDF-файлы представлены только в архивах.
Рекомендуем скачать работу.