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The near-far problem is a condition in which a receiver captures a strong signal and thereby makes it impossible for the receiver to detect a weaker signal.
There is a long-standing issue that the dynamic range of one or more stages of a receiver can limit that receiver's ability to detect a weak signal in the presence of strong signal. The near-far problem usually refers to a specific case of this in which ADC resolution limits the range of signals a receiver can detect in a direct sequence spread spectrum (DSSS) system such as CDMA. The receiver's AGCmust reduce its gain to prevent ADC saturation, which causes the weaker signal to fall into the noise of the ADC. This is different from a condition of one signal interfering with another because if the ADC had sufficient resolution, it would be possible to recover both signals.
By contrast,TDMA systems are less vulnerable.
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∙ 11y ago
The near-far effect in TDMA systems refers to the issue where a strong nearby signal can overpower a weaker distant signal, leading to interference. This can result in decreased system performance, such as increased error rates and reduced data throughput. TDMA systems typically mitigate this effect by using power control algorithms to adjust transmission power levels based on signal strength measurements.
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