| 摘要 |
A direct conversion quadrature receiver is known for use in cellular radio systems. Such a receiver is designed for a single system and is not suitable for other systems having a different frequency band and signals having a different bandwidth. Also multi-band cellular receivers are known, with a number of front-receivers suitable for each band. Such a receiver is not very efficient and is expensive and bulky. A wireless multi-band communication is proposed which is low cost and which automatically adapts itself to signals received from a particular system. On the basis of the bandwidth of the received desired signal, a sampling bandwidth and/or sampling time is selected of mixed down signals. Furthermore, the sampling means are band limited as regards noise. An adaptive filter coupled to the sampling means is adjusted in accordance with the determined adjacent channel to desired channel interference level. |
