FFT receiver for MFSK
First Claim
1. An electronic circuit comprising:
- a receiver for receiving a signal comprising a data signal at a frequency within a range of discrete frequency tones representing a predetermined range of digital values and a pilot signal;
a transformer for transforming the received signal into a set of frequency samples of the pilot signal and a set of frequency samples of the data signal; and
a correlator for correlating the set of frequency samples of the pilot signal with the set of frequency samples of the data signal at each of the discrete frequency tones in order to identify the discrete frequency tone to which the frequency of the data signal corresponds and thereby to identify the digital value represented by the data signal.
2 Assignments
0 Petitions
Accused Products
Abstract
Data is transmitted in a signal comprising a data signal Dm at a frequency within a range B of discrete frequency tones D0 to Dm-1 representing a predetermined range of digital values, and a pilot signal (36, 37). The signal is received by a circuit comprising a transformer (44 to 54) which transforms the received signal into a set of frequency samples of the pilot signal and a set of frequency samples of the data signal. The samples are input to a correlator (58) which correlates the set of frequency samples of the pilot signal with the set of frequency samples of the data signal at each of the discrete frequency tones in order to identify the discrete frequency tone to which the frequency of the data signal corresponds. In this way, the digital value represented by the data signal can be identified. The circuit is suitable for use in a radio pager for receiving data signal transmissions from a distant source which may be transmitted from a satellite.
48 Citations
35 Claims
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1. An electronic circuit comprising:
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a receiver for receiving a signal comprising a data signal at a frequency within a range of discrete frequency tones representing a predetermined range of digital values and a pilot signal; a transformer for transforming the received signal into a set of frequency samples of the pilot signal and a set of frequency samples of the data signal; and a correlator for correlating the set of frequency samples of the pilot signal with the set of frequency samples of the data signal at each of the discrete frequency tones in order to identify the discrete frequency tone to which the frequency of the data signal corresponds and thereby to identify the digital value represented by the data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 24, 25, 26, 27, 28, 29)
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13. A method of decoding a signal comprising a data signal at a frequency within a range of discrete frequency tones representing a predetermined range of digital values and a pilot signal, the method comprising:
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transforming the signal into a set of frequency samples of the pilot signal and a set of frequency samples of the data signal; and correlating the set of frequency samples of the pilot signal with the set of frequency samples of the data signal at each of the discrete frequency tones in order to identify the discrete frequency tone to which the frequency of the data signal corresponds and thereby to identify the digital value represented by the data signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 30, 31, 32, 33, 34, 35)
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Specification