Patent ID: 7738609
Filing Date: 2010-06-15
Classification: H04B,H04L

Abstract:
1. A method for switching from a first signal source to a second signal source in order to produce an output signal from a communication system, wherein the first signal source produces a first signal, the second signal source produces a second signal, and both the first signal and second signal are received by the communication system, the method comprising: storing first signal samples obtained from the first signal in a first shift register in a memory section; storing second signal samples obtained from the second signal in a second shift register in the memory section; generating the output signal from the first signal samples, wherein the first signal samples are read from the first shift register at a first operating point that is a center stage of the first shift register; determining whether to switch from the first signal to the second signal for generating the output signal, by evaluating the first signal samples and the second signal samples, wherein the second signal samples are read from the second shift register at a second operating point; if it is determined that the first signal should be switched to the second signal, then determining a signal transit time difference between the first signal and the second signal; obtaining a location in the memory section based on the signal transit time difference; retrieving selected second signal samples from the memory section based on the signal transit time difference and the location in the memory section; and generating the output signal from the retrieved selected second signal samples.