نتایج جستجو برای: digital radio
تعداد نتایج: 401333 فیلتر نتایج به سال:
Radio pulses emitted in the atmosphere during the air shower development of high-energy primary cosmic rays were measured during the late 1960ies in the frequency range from 2 MHz to 520 MHz. Mainly due to difficulties with radio interference these measurements ceased in the late 1970ies. LOFAR (Low Frequency Array) is a new digital radio interferometer under development. Using high bandwidth A...
Radio pulses emitted in the atmosphere during the air shower development of high-energy primary cosmic rays were measured during the late 1960ies in the frequency range from 2 MHz to 520 MHz. Mainly due to difficulties with radio interference these measurements ceased in the late 1970ies. LOFAR (Low Frequency Array) is a new digital radio interferometer under development. Using high bandwidth A...
The Ultra Wide Band (UWB) radio is a promising technology for wireless digital communications. In this paper we present the main principles for the radio resource sharing in UWB. We describe both the theoretical approach and the practical one and we address the procedures of a MAC protocol for the support of Dynamic Bandwidth service class and Reserved one.
This article focuses on the in-phase/quadrature (I/Q) imbalance problem in quadrature ΣΔ modulators (QΣΔM). In the literature, such quadrature modulators have been seen as a promising possibility for software defined radio (SDR) receivers, but matching the quadrature circuits is an inevitable problem for this kind of systems. In this article, an analytic closed-form model will be derived for a ...
A multirate IF filter for mobile radio has been implemented in silicon. The filter consists of a decimation stage followed by a bandpass filter. Both parts use a lattice wave digital structure. The design and implementation are described beginning with the filter specification and proceed through algorithmic design, operations scheduling, and resource allocation and assignment. Every step tries...
Digital radio links with bandlimited pulses exhibit a severe performance degradation when the transmitter high power amplifier operates near saturation. To cope with the increase of nonlinear intersymbol interference due to the amplifier nonlinearities, a discrete-time Volterra system can be used to process the transmitted data. We present an efficient technique for implementing adaptive data p...
Electronic news gathering and live outside broadcasts need a quick and easy method of getting the programme material back to base. The success of mobile telephones has encouraged the telecommunications industry to develop more advanced systems offering higher capacities. Mobile Broadband System (MBS) is a wireless cellular radio network supporting services up to 34 Mbits/s. The network is being...
Introduction Noise figure (NF) and the third-order intercept point (IP3) are used in radio receiver link budget analysis as a means to quantify the effects of device noise and nonlinearity on the sensitivity of the radio. Analog-to-digital converters (ADCs) are used in radio receivers to convert the signal from the analog domain to the digital domain. NF and IP3 typically are not specified for ...
The role of firmware and digital signal processing in radio transceiver design has increased to meet the global coverage requirement and to cover extra features in the mobile telephony. The Software-Defined Radio (SDR) is the practical approach for this. The paper reviews the SDR concepts, the benefits, the design steps involved in SDR, some emerging concepts, technological solutions and challe...
Australia is contributing to the next generation radio telescope, the Square Kilometre Array (SKA), which will have a collecting area of one million square metres. The SKA will be a digital radio telescope that will rely on high-speed data communications for routine global electronic transmission of VLBI data and some traditional analog stages will be replaced by software-defined blocks on fast...
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