RAKE RECEIVER WITH VARIABLE BANDWIDTH IN ORDER TO MINIMIZE GUARD BANDS

摘要

A variable bandwidth receiver (30) uses allocated bandwidth more efficiently
and ensures that blocking signals do not overload receiver components. The
receiver includes multiple branches (34a...34n) for receiving a first
bandwidth signal. Each receiver branch has a filter (48a.. .48n) for passing
signals in a frequency band corresponding to a second bandwidth less that the
first bandwidth and an analog-to-digital Converter (58a...58n) for converting
the baseband signal into a digital signal. A Controller (36, 60) digitally
combines the digital signals from two or more of the receiver branches to
produce a received signal having a bandwidth substantially wider than the
first bandwidth. Because combining is done after analog-to-digital conversion
in the digital domain, the Controller can combine the digital signals from two
or more of the receiver branches having adjacent corresponding frequency bands
without the normal guard band separating them.