DETERMINATION OF ACCEPTABLE PARAMETERS AREA IN MODIFIED DETECTOR OF QUADRATURE PHASE SHIFT KEYING SIGNALS
Journal Title: Вісник Національного університету "Львівська політехніка", серія "Радіоелектроніка та телекомунікації" - Year 2015, Vol 818, Issue 2015
Abstract
This paper describes the Matlab simulation results of receiving signals with quadrature modulation, such as OQPSK, using modified phase detector. As the result, the BER-to-SNR diagrams were presented for modified and classical detector. The conclusions about its effectiveness were made. There are new methods of modulation signals that allow effective use of the frequency band, and communication systems (eg. trunking) that can effectively distribute the network traffic. However, further development of communication systems is limited by threshold SNR, which is one of the determining factors for the calculation of the capacity of the channel. This paper shows the possibility of increasing noise immunity and capacity of modern cellular communication systems and trunking communication without increasing transmitter power. The improved PLL resistance to noise without changing of dynamic properties is implemented using a modified synchronous phase detector. The proposed scheme of modified PLL device differs from the classical analogue by the narrow band pass filters, placed before the detector, and high-band filter after it. The simulation processes of detection OQPSK signals which were used in modern systems such as cdma2000 were made. For as close as possible to the real analogue, the phase detector in imitation model was implemented with levelling filters. These filters are used in communication systems to reduce intersymbol interference that occurs in the digital channel. Research was carried out for the case of signal detection by classical and modified detectors. The aim of the research was to determine the bit-error rate (BER) in the received signal at a particular value of SNR. The obtained BER-to-SNR values for the classical phase detector were compared with similar ratios given in the open literature. The research results show that modified detector is more efficient than classical detector due to its higher noise immunity. As a result of simulation6 model of the modified detector research in Matlab program the recommendations for selecting detector filters parameters at high noise level were made. This makes possible to use them in the designing of modern phase demodulators. The modelling results show the potential for increasing the efficiency of existing cellular communications that use complex types of phase modulation with no additional energy costs. The results of modification using narrowband filters before detector of OQPSK signals can significantly improve its noise immunity and energy efficiency.
Authors and Affiliations
Yuriy Bobalo, Andriy Bondariev, Ivan Maksymiv
Keywords
Related Articles
- EP ID EP458066
- DOI -
- Views 146
- Downloads 0
DEVELOPMENT THE PROCESS OPTIMIZATION METHOD OF MANUFACTURING THE RADIO-ELECTRONIC EQUIPMENT WITH USING OPTIMIZATION PARETO-REGIONS
At the department of theoretical radioengineering and radiomeasurements of Lviv Polytechnic National university the theory and methods of modeling and a process optimization the quality assurance processes of the radio-e...
INVESTIGATION OF STABILITY OF PARAMETRIC AMPLIFIERS IN AN ENVIRONMENT MAOPCs
The paper considers the question of the research of assessment of the stability of linear periodically time-variable circuits by the frequency symbolic method. The function system MAOPCs, which is based on the frequency...
RESEARCH ON THE TRAFFIC AGGREGATION PROCESS IN OPTICAL BURST SWITCHED NETWORKS
Next generation optical networks should provide high capacity to support ever increasing traffic demands. Many technologies have been developed recently for optical transport networks to increase throughput, improve ener...
MULTICHANNEL DATA TRANSMISSION SYSTEM IN THE SPLINE BASES
The article deals with multichannel digital data transmission system in which the digital signal is transmitted through the manipulation of the harmonic function which performs subcarrier function with different frequenc...
DETERMINATION OF ACCEPTABLE PARAMETERS AREA IN MODIFIED DETECTOR OF QUADRATURE PHASE SHIFT KEYING SIGNALS
This paper describes the Matlab simulation results of receiving signals with quadrature modulation, such as OQPSK, using modified phase detector. As the result, the BER-to-SNR diagrams were presented for modified and cla...