Microwave Radio Transmission Design Guide
A practical guide for engineers planning or building a microwave-based transmission system, with a special eye toward international standards.
TABLE OF CONTENTS Microwave Radio Transmission Design Guide
Section 7.3: Types of Interference
7.3 Types of Interference
There are two types of interfering signals: one with a variable C/I, the other with a constant C/I.
7.3.1 Variable C/I
In this case the interfering signal is constant but the carrier level varies due to fading over the path. It is assumed that the fading that the carrier experiences is independent from the fading experienced by the interfering signal. This results in the C/I vary with fading. The effects are thus analyzed at the threshold of the receiver (high BER).
7.3.2 Constant C/I
In this case both the carrier and the interfering signal are affected by the same amount of fading. This is the case when the signals travel over the same path. The absolute wanted signal and interfering signal levels may change, but the ratio between them remains the same. These effects are analyzed for a strong receive signal where thermal noise is not a problem and intersymbol interference is the main concern.
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