It is given by the following formula:Ĭoherence Bandwidth (CB) = Doppler Spread / 2π Coherence bandwidth is directly proportional to the Doppler spread of the channel. It is the bandwidth over which the signal's phase remains unchanged. Conversely, when the coherence time is short, the channel changes rapidly, leading to a less stable link.Ĭoherence bandwidth is the frequency range over which a wireless channel remains constant. When the coherence time is long, the channel changes slowly, and the communication link is more stable. The Doppler spread is the rate at which the channel changes due to the movement of the transmitter or receiver. Coherence time is inversely proportional to the Doppler spread of the channel. It is the time period within which the signal's phase remains unchanged. Coherence time is the duration over which a wireless channel remains constant. Coherence Time and Bandwidthīefore we dive into coherence bandwidth, let us first understand coherence time and coherence bandwidth. In this article, we will explore the definition, significance, and mathematical formulation of coherence bandwidth. It is a critical parameter that characterizes the ability of a communication channel to transmit data with minimum distortion. Coherence Bandwidth (CB) is a fundamental concept in wireless communication systems, especially in radio frequency (RF) and microwave systems.
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