Frequency Selective Fading

General

March 31, 2020
77
Flat Fading និង Frequency Selective Fading
នៅក្នុងមជ្ឃដ្ឋានបញ្ជូនស៊ីញ៉ាល់វិទ្យុក្នុងបរិយាកាស់ ជាពិសេសលើ Microwave Link, សំរាប់បណ្តាប្រេកង់ដែលខ្ពស់ជាង 13GHz, ការថយចុះថាមពលស៊ីញ៉ាល់ដោយសារ ព្រិល ភ្លៀង គឺជាកណ្តាចំបងដែលកំរិតប្រវែងបញ្ចូនស៊ីញ៉ាល់ពត៌មាន។ តំហយចុះនេះហៅថា flat attenuation រឺ flat fading។ Flat fading មានន័យថា តំហយចុះកើតឡើងចំពោះសមាសធាតុប្រេកង់ទាំងឡាយនៅក្នុងគំលាតបង់ប្រេកង់ទាំងមូលតាមលក្ខណះដូចៗគ្នា។…
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