- TITLE:
SIMULATION RESEARCH OF DVB-T WITH MODULATION CONSTELLATIONS QPSK, 16QAM AND 64QAM
- AUTHOR(S):
T. Manev, N. Tashkov
- ABSTRACT:
In this paper comparative analysis is made for the required signal to noise ratios for the different modulation constellations QPSK, 16QAM and 64QAM for DVB-T, where BER=1*10 -7 is achieved. This guarantees quality transmission of the modulated data. Using the standard model for digital modulation 64QAM for DVB-T in MATLAB/Simulink, new models are created for QPSK и 16QAM. This allows for comparative analysis and evaluation of transfer speeds in different signal to noise ratios.
- TITLE:
PLANNING OF CELLULAR RADIO COVERAGE BASED ON SIMULATION RESEARCH
- AUTHOR(S):
D. Koleva
- ABSTRACT:
The paper summarizes the basic steps in the design of a GSM network. It is considered a hypothetical design using EDX-Signal Pro software. In choosing an area from the digital map generated by the software. Carry out a study of traffic patterns, demography and the land surface suitability in a given area in order to select the number and location of base stations. The network parameters are entered into the software package, generating a visual results exhibit. Demonstrate the advantages of computer-aided design using software such as EDX- Signal Pro, which include greatly reduced cost and time spent on the design process.
- TITLE:
PLANNING OF CELLULAR RADIO COVERAGE BASED ON SIMULATION RESEARCH
- AUTHOR(S):
D. Koleva
- ABSTRACT:
The paper summarizes the basic steps in the design of a GSM network. It is considered a hypothetical design using EDX-Signal Pro software. In choosing an area from the digital map generated by the software. Carry out a study of traffic patterns, demography and the land surface suitability in a given area in order to select the number and location of base stations. The network parameters are entered into the software package, generating a visual results exhibit. Demonstrate the advantages of computer-aided design using software such as EDX- Signal Pro, which include greatly reduced cost and time spent on the design process.
- TITLE:
ONE-OPERATIONAL TWO - STAGE TECHNOLOGY FOR FINISHING OF HOLES IN ALUMINUM ALLOY 2024-Т3 PART 2: MICRO-HARDNESS AND MICRO-STRUCTURE
- AUTHOR(S):
I. M. Amudjev
- ABSTRACT:
The article presents the outcomes for the roughness and micro-hardness obtained the finishing of holes in aluminum alloy 2024-Т3 using one-operational two-stage technology. During the first stage the hole is trilled and reamed by means of specially designed tool. During the second stage the is slide burnished through slid diamond burnishing tool with bilateral action. The study have been carried out on HAAS Mini Mill machining centre.
- TITLE:
ONE-OPERATIONAL TWO - STAGE TECHNOLOGY FOR FINISHING OF HOLES IN ALUMINUM ALLOY 2024-Т3 PART 1: ROUGHNESS MODELLING
- AUTHOR(S):
I. M. Amudjev
- ABSTRACT:
The article presents the outcomes for the roughness and micro-hardness obtained the finishing of holes in aluminum alloy 2024-Т3 using one-operational two-stage technology. During the first stage the hole is trilled and reamed by means of specially designed tool. During the second stage the is slide burnished through slid diamond burnishing tool with bilateral action. The study have been carried out on HAAS Mini Mill machining centre.
