#### Question 2.5

## Symbol rate (cont.)

### Bandwidth efficiency

#### The bandwidth efficiency of a communications link is a measure of how well a particular modulation format (and coding scheme) is making use of the available bandwidth. #### Units for bandwidth efficiency of a digital communications link: #### Bandwidth efficiency --> bits/second/Hz

#### For example, if a system requires 4 kHz of bandwidth to continuously send 8000 bps of information, the bandwidth efficiency of the link is: Bandwidth efficiency = 8000 bps / 4000 Hz = 2 bits/second/Hz