scholarly journals Model Impulse Response High Frequency Communication Channel with the Identifi cation of Parameters of Multipath

2016 ◽  
Vol 9 (3) ◽  
pp. 385-391
Author(s):  
Vadim S. Revin ◽  
◽  
Aleksandr M. Mezhuev ◽  
Aleksandr V. Korennoi ◽  
◽  
...  
Keyword(s):  
Impulse Response ◽  
High Frequency ◽  
Communication Channel

The Transient Response of Structures Using Asymptotic Modal Analysis

1998 ◽  
Vol 65 (1) ◽  
pp. 258-265 ◽  
Author(s):  
R. R. Reynolds ◽  
E. H. Dowell
Keyword(s):  
Numerical Methods ◽  
Finite Elements ◽  
Modal Analysis ◽  
Impulse Response ◽  
Transient Response ◽  
High Frequency ◽  
Natural Frequencies ◽  
Mode Shapes ◽  
Frequency Range ◽  
Modal Solution

The transient response of a structure is predicted using an asymptotic modal approximation of the classical modal solution. The method is aimed at estimating the impulse response problem for high frequency regimes where typical numerical methods (e.g., finite elements) are impractical. As an example, the response of a thin elastic panel is modeled in a frequency range that includes a sufficient number of modes. Both impulsive and arbitrary forms of excitation are considered. It is shown that the asymptotic modal analysis yields an excellent estimate of both the local displacement near the excitation location and of the spatially averaged transient response of the panel for moderate time spans after the excitation is applied. Furthermore, as this approach does not require that the mode shapes or natural frequencies of the structure to be calculated, it is an extremely efficient technique.

ESTIMATION OF THE IMPULSE RESPONSE OF COMMUNICATION CHANNEL WITH MEMORY FOR THE OFDM SYSTEM

2020 ◽  
Author(s):  
В.Г. КАРТАШЕВСКИЙ ◽  
К.С. СЛИПЕНЧУК
Keyword(s):  
Impulse Response ◽  
Regularization Method ◽  
Communication Channel ◽  
Communication Channels ◽  
Ofdm System ◽  
Wise Decision ◽  
Transmitted Signal ◽  
With Memory ◽  
Ofdm Signals ◽  
Selection Of

Рассмотрена проблема оценивания методом регуляризации импульсной характеристики канала связи с памятью при приеме сигналов OFDM с использованием алгоритма «прием в целом с поэлементным принятием решений». Предлагаются варианты новых структур потока OFDM-символов с исключением защитных интервалов и включением испытательной комбинации (ИК)в структуру передаваемого сигнала при наличии памяти в каналах связи; для быстроизменяющихся каналов предлагается частая вставка ИК. Подбор ИК позволяет улучшить показатели качества оценивания импульсных характеристик методом регуляризации при наличии памяти в каналах связи. The problem of estimating the impulse response of the communication channel with memory when receiving OFDM signals using the "reception in general with element-wise decision-making" (RGEWDM) algorithm by the regularization method is considered. Variants of new structures of a stream of OFDM symbols are proposed with the exclusion of guard intervals and the inclusion of a test combination (TC) in the structure of the transmitted signal in the presence of memory in the communication channels; for rapidly changing channels frequent insertion of TC is proposed. The selection of TCs allows improving the quality indicators of impulse response estimation by the regularization method in the presence of memory in communication channels.

On a Design of Narrowband FIR Low-Pass Filters

2011 ◽  
pp. 2882-2887
Author(s):  
Gordana Jovanovic Dolecek ◽  
Javier Diaz Carmona
Keyword(s):  
Impulse Response ◽  
High Frequency ◽  
Digital Filters ◽  
Stop Band ◽  
Low Frequency ◽  
Pass Band ◽  
Low Pass ◽  
Frequency Components ◽  
Band Pass ◽  
High Pass

Stearns and David (1996) states that “for many diverse applications, information is now most conveniently recorded, transmitted, and stored in digital form, and as a result, digital signal processing (DSP) has become an exceptionally important modern tool.” Typical operation in DSP is digital filtering. Frequency selective digital filter is used to pass desired frequency components in a signal without distortion and to attenuate other frequency components (Smith, 2002; White, 2000). The pass-band is defined as the frequency range allowed to pass through the filter. The frequency band that lies within the filter stop-band is blocked by the filter and therefore eliminated from the output signal. The range of frequencies between the pass-band and the stop-band is called the transition band and for this region no filter specification is given. Digital filters can be characterized either in terms of the frequency response or the impulse response (Diniz, da Silva & Netto, 2002). Depending on its frequency characteristic, a digital filter is either low-pass, high-pass, band-pass, or band-stop filters. A low-pass (LP) filter passes low frequency components to the output, while eliminating high-frequency components. Conversely, the high-pass (HP) filter passes all high-frequency components and rejects all low-frequency components. The band-pass (BP) filter blocks both low- and high-frequency components while passing the intermediate range. The band-stop (BS) filter eliminates the intermediate band of frequencies while passing both low- and high-frequency components. In terms of their impulse responses digital filters are either infinite impulse response (IIR) or finite impulse response (FIR) digital filters. Each of four types of filters (LP, HP, BP, and BS) can be designed as an FIR or an IIR filter (Ifeachor & Jervis, 2001; Mitra, 2005; Oppenheim & Schafer, 1999).

Analysis of approaches to the organization of a composite communication channel in the high frequency range

2017 ◽  
Vol 14 (4) ◽  
pp. 62-69
Author(s):  
T. V. Gorsky ◽  
А. A. Teterina
Keyword(s):  
High Frequency ◽  
Communication Channel ◽  
Local Area Network ◽  
Satellite Communications ◽  
Local Area ◽  
Area Network ◽  
High Frequency Range ◽  
Frequency Range ◽  
Internet Protocols ◽  
Network Channel

Reviewed and analyzed issues related to the organization of a composite ka-Nala connection in the high frequency range. Analyzed three typical ways of forming compound (RF local area network) channel. It is shown that the transparency of the high frequency channel is provided through the use of Internet protocols at network and transport levels. Examines the use of communications equipment in mobile Radioservice. The analysis of approaches to the organization with a set of communication channel with the use of satellite communications.

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