| 摘要 |
<p>A matched filter computes complex correlations between a sequence of complex input values and a complex code. The matched filter includes a set of N changeover switches (55) having a first input connected to receive real parts (Sr) of the input sample values and a second input connected to receive imaginary parts (Si) of the input sample values. The switches (55) further include a control input for receiving a control signal (CN) in first and second states. When the control signal (CN) in the first state is applied, a first output of the changeover switch (55) contains the real value part (Sr) of the input sample values and a second input contains the imaginary part (Si) of the input sample values. When the control signal (CN) is in the second state the first input contains the imaginary value part (Si) of the input sample values and the second input contains the real value part (Sr) of the input sample values.</p> |
