Wi-Max in the frequency band 3600 MHz

Contents

SUMMARY

INTRODUCTION

1. DESCRIPTION OF COMMUNICATION NETWORK WiMax

1.1. Definition of WiMAX

1.2. Evolution of Global Network Access

1.3. History of the project WiMAX

1.4. Tasks, purposes, advantages of WiMAX

1.5. Prospects for WiMAX development for the coming years

1.6. WiMAX today

1.7. Prospects for WiMAX in the Kyrgyz Republic

1.8. Principle of operation WiMAX

1.9. Operating modes of the WiMAX

1.10. Tests WiMAX

2. METHOD OF CALCULATING FREQUENCY-TERRITORIAL DIFFERENCES FOR BROADBAND ACCESS SYSTEMS WiMax

2.1 Definitions and general methodological approach

2.2 Condition of EMC RES support

2.3 Calculated attenuation formulas

2.3.1 Calculation of attenuation due to frequency adjustment

2.3.2 Calculation of attenuation of signals during propagation along the Earth's surface

2.3.2.1 Additional losses due to reflection from local objects

2.4 Plotting Territorial Posting Standards

2.5 Analysis of avionics mutual influence variants and sequence of calculation of TTD norms

3. CALCULATION OF CHP RATES BETWEEN WiMax STATIONS AND FIXED SERVICE

3.1 Initial data for calculations

3.2 Calculation of CTP standards

4. ECONOMIC JUSTIFICATION FOR THE DEVELOPMENT OF NORMS OF FREQUENCY-TERRITORIAL DIFFERENCES

5. SUBSTANTIATION OF REQUIREMENTS AND CALCULATION OF PARAMETERS OF PREMISES AND WORKING CONDITIONS OF DESIGNERS FOR 10 SEATS

CONCLUSION

LITERATURE USED

Summary

This diploma project develops standards of frequency-territorial differences for broadband access systems WiMax in the frequency range of 3600 MHz.

In the theoretical part, the broadband access system WiMax is described in detail. The calculation of attenuation of signals along the earth's surface was carried out in accordance with the Recommendation of ICER P.452, and the calculation of attenuation due to frequency adjustment in accordance with the materials of the Vienna Agreement on the Coordination of Frequency Assignments.

On the economic side, an economic justification was made for the development of norms for frequency-territorial differences. The issues of substantiating the requirements and calculating the parameters of the premises and working conditions of designers for 10 seats were considered.

Tasks, purposes, advantages of WiMAX

To promote and develop WiMAX technology, a WiMAXforum was formed on the basis of the IEEE 802.16 working group, created in 1999. The forum included companies such as Nokia, Harris Corporation, Ensemble, Crosspan and Aperto. By May 2005, the forum had already brought together more than 230 participants. In the same year, the World Summit on Information Society (WSIS) formulated the following tasks that were assigned to WiMAX technology.

1. Provide WiMAX with access to information and communication technology services for small settlements, remote regions, isolated facilities, given that in developing countries 1.5 million settlements with more than 100 inhabitants are not connected to telephone networks and do not have cable connections to large cities.

2. Provide access to information and communication technology services by WiMAX to more than half of the world's population within its reach, taking into account that the total number of Internet users in 2005 was approximately 960 million, or about 14.5 per cent of the total population of the Earth.

The goal of WiMAX technology is to provide universal wireless access for a wide range of devices (workstations, smart home appliances, portable devices and mobile phones) and their logical integration - local area networks. It should be noted that the technology has a number of advantages.

1. Compared to wired (xDSL, T1), wireless or satellite systems, WiMAX networks should allow operators and service providers to cost-effectively reach not only new potential users, but also to expand the range of information and communication technologies for users who already have fixed (fixed) access.

2. The standard combines carrier-level technologies (to combine many subnets and provide them with access to the Internet), as well as "last mile" technologies (the final segment from the point of entry into the provider's network to the user's computer), which creates versatility and, as a result, increases the reliability of the system.

3. Wireless technologies are more flexible and, as a result, easier to deploy, as they can scale as needed.

4. Ease of installation as a factor in reducing the cost of deploying networks in developing countries, sparsely populated or remote areas .

5. The coverage range is a significant indicator of the radio communication system. At the moment, most wireless broadband technologies require line of sight between network objects. WiMAX using OFDM technology creates coverage areas in the absence of line of sight from the client equipment to the base station, with distances calculated in kilometers.

6. The WiMAX technology initially contains the IP protocol, which allows it to be easily and transparently integrated into local networks .

7. The technology is WiMAX suitable for fixed, movable and mobile network objects on a single infrastructure.

WiMAX today

Despite the fact that widespread distribution WiMAX still only in the project even in the most developed countries, the implementation of the standard is progressing at an enviable rate. It would seem that just recently - last fall, during the days of the Intel Forum for Developers in the premises of the Russian Academy of Sciences for the first time in Russia, the work of the experimental network IEEE802.162004 was demonstrated. And now, not somewhere in America or Asia, but in Kiev, in Ukraine, the company Ukrainian latest technologies launched the first in the CIS countries network of wireless broadband Internet access based on WiMAX technology. This week, under the new brand name ALTERNATIVE, the Ukrainian Latest Technologies network began to provide WiMAX-based wireless broadband Internet access services using client devices built on the Intel PRO/Wireless 5116 chipset.

The services provided are fixed wireless Internet access using Alvarion client-based WiMAX technology on the Intel PRO/Wireless 5116 chipset. They are offered to companies and individuals who are located in areas with poorly developed or outdated cable infrastructure. The company "Ukrainian latest technologies" intends to provide turnkey services in just a couple of days from the moment of the first call of the client.

In fact, it should not be assumed that in Ukraine there is some kind of WiMAX anomaly. The introduction of WiMAX networks has been ongoing lately, announcements of the launch of such networks around the world are announced almost every day.

Conclusion

The purpose of this diploma project was to develop norms of frequency-territorial differences for the WiMax communication system in the Kyrgyz Republic. The theoretical part describes in detail the communication system WiMax.

Detailed, the very method of calculating the norms of frequency-territorial differences is given. To calculate propagation attenuation along the Earth's surface, we will use MSER Recommendation P.452 "Procedure for predicting microwave interference between stations on the Earth's surface at frequencies above about 0.7GHz," which is a harmonized model in MSER and CEPT for estimating interference, which also includes additional losses due to changes in antenna heights under conditions of indiscriminate reflection from local objects.

A significant gain, in terms of interference protection, can be obtained by taking into account the additional diffraction losses that occur due to the erratic reflection of the signal from local objects (buildings, plants, etc.) surrounding the antennas. The procedure described allows you to take into account such losses at one or both ends of the route in situations where there is complete information about the type of environment. If such information is not accurate, then these additional losses should not be taken into account.

The reflection losses from local objects for the interference generating and experiencing stations are indicated by Aht (dB) and Ahr (dB), respectively. The possible additional protection depends on the height and is therefore modeled as a gain function by the height normalized to the nominal height of the local reflecting objects. There are corresponding values of nominal heights for a number of such reflectors of various types.

For correct use of formulas for calculation of additional losses Ah, the following terrain characteristics must be taken into account:

1. Dense urban development (a densely populated city) is a dense development mainly with tall buildings (above 20 floors) with a small area of ​ ​ green spaces. The coating of the cells is largely determined by diffraction and scattering of the signal on the buildings closest to the subscriber.

2. Urban development - multi-storey administrative and residential development, industrial areas. The density of buildings is quite high, but can be diluted with green spaces, small squares.

3. Suburbs - single residential buildings, administrative buildings, shops 1-3 floors high. Large areas of green spaces (trees), park areas with separate groups of dense buildings.

4. The countryside is an open space with several buildings, farms, bush plantations, and a highway.

5. Open space - lakes, reservoirs, open areas without plantations, fertile land.

Calculation of attenuation due to frequency adjustment in accordance with the materials of the Vienna Agreement on Coordination of Frequency Assignments. The calculation method is based on the integration of the spectrum density of the total part of the transmitter spectrum mask and the receiver selectivity mask. The areas of these elements are relative parts of the power with respect to the transmitter power. The area within the entire mask is the transmitter power. In addition, there are simplified calculation methods for special cases:

• The interfering transmitter bandwidth is smaller than the receiver bandwidth and the entire transmitter spectrum is within the receiver bandwidth;

• The interfering transmitter bandwidth is greater than the receiver bandwidth and the transmitter spectrum covers the entire receiver bandwidth

A large number of different FS systems are currently operating in the 3600 MHz band and a number of new systems are being developed to meet the growing demand. The required differences in frequency and distance of cellular RES of the standard WiMax3600 with fixed service RES (PS) in the range of 3600 MHz were determined using the example of Aperto equipment, and the characteristics of the fixed service station (PS) in the example of equipment of the radio relay station "Dawn."

On the economic side, an economic justification was made for the development of norms for frequency-territorial differences. The issues of substantiating the requirements and calculating the parameters of the premises and working conditions of designers for 10 seats were considered.