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 151
- Downloads 0
FORMATION SERVICE AREA OF THE TRANSCEIVER STATION DEPENDING ON THE VARYING INPUT LOAD
The method of managing energy saving in maintaining a subscriber load by a group of service nodes of access to the network, to provide a service process at a given level of quality in the conditions of multi-channel serv...
STAGES OF THE MODERN IT SERVICES DEVELOPMENT AND ENERGY EFFECTIVENESS OF NETWORK TECHNOLOGIES
The article reviews the architectural transformation of modern networks and their (mobile) services and applications. Periods of network services, Internet and cloud computing are posted. We describe the requirements for...
DEFINITION OF CONDITIONS OF TRANSITION FROM CORRECTIVE RECOVERY TO PLANNED RECOVERY STRATEGY OF UNINTERRUPTIBLE POWER SUPPLY
The problem of the conditions definition of the transition from the corrective recovery to the planned recovery strategy of an uninterruptible power supply, while a reliability is kept on the same level, is considered in...
EFFECTIVENESS OF THE DIRECT SEQUENCE SPREAD SPECTRUM FOR THE COMMUNICATION SYSTEMS BASED ON TIMING SIGNALS
Cryptographic systems are considered to be quite an effective mechanism for the protection of information, and they are used mainly in the upper levels of the reference model OSI. However, analysis of trends in cryptogra...
TWO-STAGE FILTRATION ALGORITHM WITH INTERFRAME NON-CAUSAL PROCESSING FOR MULTICHANNEL IMAGE WITH PRESENCE OF UNCORRELATED NOISE
In many modern information and technical systems multichannel images have several applications. The multichannel image can be presented as a set of images of an object of a research which are received in various areas of...