transmission analysis of a single hop for microwave link
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HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Confidential
Security Level: INTERNAL23/4/17
英文标题 :40-47pt
副标题 :26-30pt
字体颜色 : 反白内部使用字体 :
FrutigerNext LT Medium
外部使用字体 : Arial
中文标题 :35-47pt
字体 : 黑体 副标题 :24-28pt
字体颜色 : 反白字体 : 细黑体
Optical Network Engineering Dept.
Transmission Analysis of a Single Hop for
Microwave Link
Oct. 2007
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Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Overview Purpose
1. Masters the configuration method of the modules in the Pathloss Worksheets.
2. Completes the analysis of a single hop of microwave link.
Studied Case
Project area: a country in Africa, which is located at the eastern longitude and southern latitude, Southern
Hemisphere
Basic information the single-hop link:
High-accuracy electronic map:
Electronic map in the SRTM format
Site1-Site2
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Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Importing the Data
Processing the Data:
Importing the Electronic Map in the SRTM Format
1. Run the Pathloss software, and choose Configure > Terrain
Database. In the displayed dialog box, select SRTM under
Primary.
2. Click Setup Primary, and the SRTM window is displayed.
Choose Files > BIL-HDR-BLW to select the proper map (in the
format of *.hgt).
Site1-Site2.csv
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Importing the Data
Importing the Data in the Format of CSV Choose Module > Network > Site Data > Site List > Import > Site Text
File from the menu of the Pathloss, and the Import Text File dialog box is displayed.
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Importing the Data
After you determine the related items in the Import Text File dialog box, click Import. Select the data to be imported (final data format: *.CSV), click Open, and then click Import. Click Close when the process is complete.
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Importing the Data Choose Files > Save (in the format of *.gr4) > Site Data > Create Background.
Site1
Site2
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Importing the Data Drag the mouse to connect Site1 and Site2. Click on the connection line, and select
Summary. Based on the data in the Calculated Distance (km), enter the proper value in Frequency. This hop of link adopts the central frequency point 12996 MHz of the 13 GHz frequency band.
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Importing the Data Choose Module > Terrain Data > Operations > Generate Profile.
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Importing the Data Click Generate in the Generate Profile dialog box, and then click Close. Double-
click the blank area under Structure, and then select Range of Structures. Set the height of the structure (in the example, a tree of 15 meters).
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Importing the Data Choose Module > Antenna Heights, and then click .
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Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Configuring the Reliability Options Choose Module > Worksheets > Operations > Reliability Options.
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Configuring the Reliability OptionsA. Reliability Method Vigants - Barnett: Currently, it is commonly used. The required parameters include terrain
factor or climate factor, and terrain roughness. ITU-R P530-6: Recommendations of the International Telecommunication Union–Radio
Communication Sector The required parameters include channel inclination degree, angle of incidence, and earth
coefficient. ITU-R P530-7/8: Recommendations of the International Telecommunication Union–Radio
Communication Sector The required parameters include channel inclination degree and earth coefficient. KQ factor: KQ standard The required parameters include KQ factor, distance exponent, and frequency exponent. KQ*S^(-1.3): modified mode of the KQ standard The required parameters include KQ factor, distance exponent, frequency exponent, and
terrain roughness. KQ Frequency Exponent: modified KQ frequency exponentIt is set to 1.2 in the system by default. KQ Distance Exponent: modified KQ distance exponentIt is set to 3.5 in the system by default.
ITU-R P530-9: Recommendations of the International Telecommunication Union–Radio Communication Sector
Cochannel operation: Select this item when calculating the XPIC in the SDH microwave to prevent the interference of the co-frequency.
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Configuring the Reliability Options
B. Calculation Method Total Annual Time Below Level: Currently, it is commonly used. ITU-T G.821 SESR – Unavailability: Recommendations of the International
Telecommunication Union-Telecommunication Standardization Sector You can select this item when the PDH microwave is adopted. ITU-T G.826 SESR,BBER,ESR, Unavailability: You can select this item when the
SDH microwave is adopted. Description of this option is as follows: SESR (Severely Errored Seconds Rate): It refers to the ratio of the seconds when
the BER exceeds 1x10–3 and the errored seconds to total seconds in one second. It is a short-time and high-BER index. The bit errors in this condition are generally caused by the deep fading in the radio transmission.
BBER (Background Block Error Rate): It refers to the ratio of background block errors (BBE) to total blocks in a fixed measurement interval with the SES and unavailable time deducted.
ESR (Errored Seconds Ratio): It refers to the ratio of errored seconds to total seconds in one second. This index is specified for the data transmission, and is determined by the performance improvement of the equipment.
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Configuring the Reliability OptionsC. Regional Standards North America – dispersive fade margin: Currently, it is commonly used. If you
select this item, parameters of dispersive fade margin and the dispersive fade occurrence factor are required. The two parameters are automatically imported by the system from the equipment files.
ITU-R P.530 strict – equipment signature: Recommendations of the International Telecommunication Union-Radio Communication Sector for the signals of the strict equipment The required parameters for this item are automatically imported by the system form the equipment files. When you select this item, the improvement effect of the space division and frequency division are calculated as specified in ITU-R P.530-8.
D. Time percentages 99.9999%: Currently, it is commonly used, which indicates the system availability
ratio. 0.0001%: system unavailability ratio E. Type PDH: Select this item according to the actual condition. SDH: Select this item according to the actual condition.F. Treat multi-path as SES and unavailability: Currently, it is commonly used. It indicates calculating
the SES and system unavailability. SES only: It indicates calculating the SES only.
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Configuring the Reliability OptionsIn the example, we assume the following condition: The microwave equipment adopts the OptiX RTN 600, and the KQ factor is calculated when the B-Type Profile (inland hilly area, B = 1, C = 1.8, KQ = 2.75E-5) and Rain Region P (145 mm/h) are selected.
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Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Configuring the Profile Click on any position in the following figure, and the Path Profile Data dialog box is displayed.
Enter the following parameters: Field margin (dB): This parameter is a security related parameter in the actual installation and
commissioning. The typical value increases incrementally by 1 dB. KQ factor: Enter 2.75E-05 (in the case of B-Type Profile).
HUAWEI TECHNOLOGIES CO., LTD. Page 21Huawei Confidential
Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Configuring the Rain Region Click , and select ITU-R P.530-7/8 in the displayed Rain dialog box. Click Load
Rain File to select the proper rain file (from the rain files of the entire globe). In the example, select the ITU_P.RAI file. Click Open, and then click Close in the Rain dialog box.
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Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Configuring the Equipment Click , and the Radio Equipment window is displayed. Click Code Index, and the Radio Code
Index dialog box is displayed. Click New Index, and choose EQUIPMENT > mrs > HW > RTN 600 MRS > 13 GHz (in the example, the OptiX RTN 600 with a capacity of 8xE1 that operates at 13 GHz and adopts QPSK is used). Select Use 10-3 parameters in the Radio Code Index dialog box (select Use 10-3 parameters when the PDH microwave is used, and select Use 10-6 parameters when the SDH microwave is used). Select the proper equipment, and then click Both. After the process is complete, click Close.
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Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Configuring the Branching Network If the 1+0 protection mode is adopted, configuring the branching network is not required. If the
1+1 hot backup or 2+0 protection mode is adopted, the hybrid coupler (for the uni-polarized microwave antenna) is required. In this case, you need to configure the branching network, that is, you need to consider the loss of the hybrid coupler.
Click , and the Branching Network TR - TR window is displayed. Enter the value of loss in Circ. Branching loss (dB).
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Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Configuring the Joint Loss Click , and the Transmission Lines TR – TR (36.1 – 37.8) window is displayed.
Enter 0.50 dB of the connector loss at the transmit end and at the receive end. For the trunk radio equipment, the RF loss is required to be configured.
The joint loss of the split-mount radio equipment considers the connector loss only.
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Configuring the Joint LossThe joint loss of the trunk radio equipment includes the connector loss and the RF loss.
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Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Configuring the Antenna Click , and the Antennas TR – TR window is displayed. Click Code Index, and the Antenna
Code Index dialog box is displayed. Click New Index, and choose EQUIPMNT > mas > Putian (in the example, as the microwave antenna of Putian is selected, an extra loss of 0.5 dB should be added to the random loss of each site). Click OK. Select WTG0.6-127D (the proper antenna), and click Both. After the process is complete, click Close.
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Contents Overview
Importing the Data
Configuring the Reliability Options
Configuring the Profile
Configuring the Rain Region
Configuring the Equipment
Configuring the Branching Network
Configuring the Joint Loss
Configuring the Antenna
Viewing the Performance Index
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Viewing the Performance Index The system reliability index is assumed to be 99.995% for 1+0 PDH, 99.998% for 1+1 PDH,
and 99.999% for SDH. If the index is changed, the transmission distance is directly affected. The normal receive level and flat fade margin vary in a great range. If the user emphasizes or
defines a specific range, the transmission distance is directly affected. If the two parameters are not required, modify the transmission distance. If the two parameters are not required, modify the transmission distance.
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Viewing the Performance Index Choose Report > Full Report > Files, and the Save Report as RFT File dialog box is displayed. Enter
the file name Site1-Site2.rtf, and then click Save.
Site1-Site2
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