Abstract
: Software-defined radio (SDR) allows using software to set or modify working radio frequency parameters: communication standard, frequency range, modulation type, output power, etc. An interpolator is an integral part of the transmitter, which increases the sampling frequency of the modulated signal. Interpolators are built on the basis of integrated cascaded integral-comb (CIC) non-multiplier filters. CIC interpolation filters have uneven amplitude-frequency characteristic (AFC), so the CIC compensator filter is turned on for its alignment. The eye-diagrams of signals with different interpolation coefficients are investigated in the paper. The quality of the signal in the transmitter can be evaluated by the eye-diagram. Interpolation is accompanied by the effect of amplifying the signal, reducing the time of increase in pulse, reducing the signal quality factor. The jitter in the transmitter decreases when the interpolation factor is a multiple of the sampling rate of the information sequence of symbols. If the signal quality factor is Q>7, the bit error rate has a BER<10 -9 value for practice. Ref. 11, pic. 16
Highlights
Software-defined radio (SDR) is the best technology for modern telecommunication applications
SDR is a device where signal modulation parameters are specified in software using programmable logic or digital signal processors of general purpose
Random Integer Generator using as an input signal source and a QPSK Modulator - is as a modulator
Summary
The SDR is suitable for replacement the typical analog equipment such as digital generators, mixers, modulators and demodulators, which allow to be configured and managed with software. This allows communication systems to become more flexible and dynamic in response to changes in the communication channel. High-speed signal processing can be implemented by usage of digital converters with increasing or decreasing sampling rate [1,2,3]. SDR is a device where signal modulation parameters are specified in software using programmable logic or digital signal processors of general purpose. The receiver selects, converts with lowering the frequency and demodulates the channel signal using the software on the general purpose processor. Statistical analysis, eye-diagrams are used in this work
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