Coherence bandwidth

Coherence bandwidth is a statistical measurement of the range of frequencies over which the channel can be considered "flat", or in other words the approximate maximum bandwidth or frequency interval over which two frequencies of a signal are likely to experience comparable or correlated amplitude fading. If the multipath time delay spread equals D seconds, then the coherence bandwidth W_c in rad/s is given approximately by the equation:

$W_c \approx {2 \pi \over \ D}$

The coherence bandwidth varies over cellular or PCS communications paths because the multipath spread D varies from path to path.

Application

Frequencies within a coherence bandwidth of one another tend to all fade in a similar or correlated fashion. One reason for designing the CDMA IS-95 waveform with a bandwidth of approximately 1.25 MHz is because in many urban signaling environments the coherence bandwidth W_c is significantly less than 1.25 MHz. Therefore, when fading occurs it occurs only over a relatively small fraction of the total CDMA signal bandwidth. The portion of the signal bandwidth over which fading does not occur typically contains enough signal power to sustain reliable communications.This is the bandwidth over which the channel transfer function remains virtually constant.

Example

If the delay spread D over a particular cellular communication path in an urban environment is .19 µs, then using equation above, the coherence bandwidth is approximately 333 kHz, which is only about 27% of the IS-95 bandwidth.

See also

• Coherence time
• Coherence length