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How Interference Signals Occur

Perfectjammer
2023/04/26

How does signal interference occur?

The frequency band is composed of uplink interference and downlink interference.

Uplink interference refers to the interference of interference signals from the uplink frequency band. It also includes interference from external RF interference sources to the base station. The coverage range of the base station will be affected by uplink interference. If there is no uplink interference, the base station will be able to receive mobile phone signals from a distance. When communicating with the base station, uplink interference means that the phone signal must be stronger than the interference signal. The base station must be within a reasonable distance of the phone signal jammer

Downlink interference refers to the interference signal from the interference source within the frequency range of the downlink in a mobile network. Interference signals are received by mobile phones and cannot be distinguished from standard base station signals. This can cause communication interruption between the base station and the phone, resulting in dropped calls and inability to register.

Co frequency interference is also known as co frequency interference. It refers to interference from useless signals that have the same frequency as normal signals and fall within the passband of the receiver. These signals are not helpful and may be confused with the correct signs. These signals are amplified in the receiver and converted into frequencies to fall within the intermediate frequency passband. As long as co channel interference exists at the receiver input, the receiver system cannot filter or suppress co channel interference.

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Intermodulation, blocking, and adjacent frequency interference are examples of non same channel interference.


Adjacent interference

Signal interference from adjacent frequencies is called "adjacent frequency interference". An unsatisfactory receiving filter can cause adjacent frequency interference. This can cause signals from adjacent frequencies to leak into the transmission bandwidth. By using precise filtering and channel allocation, you can minimize interference from adjacent channels.

Near far effect: When the base station is transmitting at a close distance to the receiver, this problem is called near far phenomenon. When the channels used by mobile stations are very close to each other, and when the channels used by weak signal mobile stations are adjacent, the near far effect also occurs. The near-far effect has a more significant impact in UMTS networks, as all mobile stations use the same frequency band. However, the UMTS system adopts excellent power control to minimize the impact of near and far development.

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Each receiver has a specific receiving dynamic range. If the interference signal from outside the frequency band is too strong, the dynamic range of the receiver's reception will be affected. Interference is a form of interference. The receiving machine usually stops working and may experience performance degradation over time.

Intermodulation interference

If two or more frequency signals acting on the nonlinear circuit modulate each other, a new frequency signal output will be generated. If the frequency falls outside the working channel bandwidth of the receiver, intermodulation interference will occur.

Interference between mobile communication systems

In band interference refers to the use of intermodulation and other methods in CDMA transmission signals as in band noise that directly affects GSM reception signals. This will result in a decrease in the sensitivity of the GSM receiver. This interference can be further decomposed into intermodulation and transmission spurious interference.

Out of band interference: If the interference is too strong, the receiver will be completely blocked, affecting the reception function of the GSM system. This interference is also known as blocking interference.

False interference

Due to the roll off characteristics of the transmission filter, no filter can be considered an ideal stepping method.

This leads to the constant existence of out of band radiation, which we call emission spurious. Parasitic interference is caused by transmission spurious interference.