We suggest a basic fast algorithm for the noncoherent digital processing of the radio signals consisting of the minimum number of simple arithmetic operations over a signal period. On its basis there can be realized the algorithms and the correspondent digital devices for detection and noncoherent demodulation of signals with amplitude, frequency modulation and differential phase keying. Digital signal processors and modern programmable logic devices can be effectively used for their practical implementation.
A B S T R A C TWe have developed the effective algorithm for detecting digital binary phase-shift keyed signals. T his algorithm requires a small number of arithmetic operations over the signal period. It can be relatively easy implemented based on the modern programmable logic devices. It also provides h igh interference immunity by identifying signal presence when signal-to-noise ratio is much less that its working value in the receiving path. The introduced detector has intrinsic frequency selectivity and allows us to form the estimate of the noise level to realize the adaptive determination of decision threshold. In order to get confirmation of the detector operability and performance, we suggest the expressions for false alarm and missing probabilities. In addition, we have examine, both theoretically and experimentally, the influence of the detector parameters on its characteristics.
In this paper, the digital algorithm and the device for the demodulation of the quadrature amplitude modulation signals are considered. The fundamental advantages of our approach are simple hardware implementation, minimal number of arithmetic operations required over the signal period as well as the potential interference immunity in the presence of Gaussian noise. The expressions have been found for the error probability and their inaccuracy has been estimated. By means of the statistical simulation methods, the practical interference immunity of the introduced demodulator, together with the influence of phase locking errors have been tested. The introduced demodulator can be implemented either as a device independent from the programmable logic devices, or as an installation unit of the receiver equipment.
We consider the fast algorithm for digital noncoherent processing of frequency-modulated and frequency-shift keyed radio signals. This algorithm requires carrying out the minimum simple arithmetic operations over the input signal period. We are also illustrating its possibilities concerning detecting the analog frequency-modulated signals and demodulating the binary frequency-shift keyed signals. We show that the presented demodulator provides the optimal signal processing and possesses the potential noise immunity. It can be implemented by means of digital signal processors, or with the use of modern programmable logic devices.
A digital phase detector for processing signals with phase modulation in a wide range of changes in the phase of the received signal is considered. A block diagram of a digital detector with minimal computational costs for the signal period is proposed. The problem of phase jumps when it changes by more than 2π is solved. An estimate is obtained for the noise immunity of a phase detector when exposed to Gaussian noise. Supposed hardware implementation of a phase detector based on field-programmable gate arrays. It can be used in devices for digital processing of the angular modulation signals, devices for controlling the phase of the reference signal and in different measurers.
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