BRIEF DESCRIPTION OF THE DRAWINGS
The above and/or other aspects of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic block diagram of a receiver for receiving a wireless communications signal according to an exemplary embodiment of the present invention;
FIGS. 2A-2C are schematic illustrations of FSK, ASK and poor quality FSK signals, respectively, in a complex baseband coordinate space;
FIGS. 3A-3C are schematic illustrations showing use of an offset reference origin to represent the signal components of FIGS. 2A-2C, respectively in a uniform representation;
FIGS. 4A-4C are schematic illustrations showing use of a threshold to discriminate between the different signal components using the uniform signal representations of FIGS. 3A-3C, respectively;
FIG. 5 is a block diagram of the initialisation section of the demodulator of the receiver of FIG. 1;
FIG. 6 is a schematic illustration showing a basis on which an initial value of the threshold of FIGS. 4A-4C may be calculated;
FIG. 7 is a schematic block diagram of a decision making section of the demodulator of the receiver of FIG. 1; and
FIGS. 8A-8C are schematic illustrations showing generation of the demodulated output signals based on the threshold illustrated in FIGS. 4A-4C, respectively.
Patent Application
20070230624
