Multi-valued FSK communication method and multi-valued FSK communication apparatus
First Claim
1. A multi-valued FSK communication method, in which a transmitter side forms a transmission signal by multi-valued FSK modulating a packet including a synchronization signal part and a payload part and transmits the transmission signal to a receiver side, the receiver side receives the transmission signal and A/D-converts an analog demodulation signal generated by demodulating a reception signal so as to compare with a reference value, so that a multi-valued digital signal is generated, the method comprising:
- in the transmitter side, forming the transmission signal by performing multi-valued FSK modulation using only the minimum value and the maximum value in multi-valued FSK with respect to the synchronization signal part of the packet and by performing normal multi-valued FSK modulation with respect to the payload part; and
transmitting the transmission signal to the receiver side, and in the receiver side, outputting the analog demodulation signal and a binary signal generated by binarizing the analog demodulation signal from a reception circuit unit for demodulating the reception signal to a baseband processing unit; and
in the baseband processing unit, correcting the reference value for determining the level of multi-valued FSK based on a digital demodulation signal generated by A/D-converting the analog demodulation signal after synchronization is established based on the binary signal, and A/D-converting the payload part of the analog demodulation signal so as to compare with the reference value, thereby generating the multi-valued digital signal.
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Accused Products
Abstract
To provide a multi-valued FSK communication method and a multi-valued FSK communication apparatus having a simplified circuit configuration for receiving a multi-valued FSK packet. A transmitter side transmits a packet including a synchronization signal part using the maximum value and the minimum value of multi-valued FSK and a payload part using all values of multi-valued FSK. A receiver side receives the packet, and a reception circuit 3 forms an analog demodulation signal Sda by demodulating a reception signal and a binary signal Sb by binarizing the analog demodulation signal Sdm. These signals Sda and Sb are supplied to a received data processing unit 23 of a baseband signal processor 12. The received data processing unit 23 establishes synchronization based on the binary signal Sb. Also, after synchronization is established, a reference value used for converting a digital demodulation signal to a multi-valued digital signal is corrected based on the digital demodulation signal Sdd, which corresponds to a synchronization signal part, generated by A/D-converting the analog demodulation signal Sda.
30 Citations
6 Claims
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1. A multi-valued FSK communication method, in which a transmitter side forms a transmission signal by multi-valued FSK modulating a packet including a synchronization signal part and a payload part and transmits the transmission signal to a receiver side, the receiver side receives the transmission signal and A/D-converts an analog demodulation signal generated by demodulating a reception signal so as to compare with a reference value, so that a multi-valued digital signal is generated, the method comprising:
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in the transmitter side, forming the transmission signal by performing multi-valued FSK modulation using only the minimum value and the maximum value in multi-valued FSK with respect to the synchronization signal part of the packet and by performing normal multi-valued FSK modulation with respect to the payload part; and
transmitting the transmission signal to the receiver side, and in the receiver side, outputting the analog demodulation signal and a binary signal generated by binarizing the analog demodulation signal from a reception circuit unit for demodulating the reception signal to a baseband processing unit; and
in the baseband processing unit, correcting the reference value for determining the level of multi-valued FSK based on a digital demodulation signal generated by A/D-converting the analog demodulation signal after synchronization is established based on the binary signal, and A/D-converting the payload part of the analog demodulation signal so as to compare with the reference value, thereby generating the multi-valued digital signal. - View Dependent Claims (2, 3)
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4. A multi-valued FSK communication apparatus, in which a transmitter forms a transmission signal by multi-valued FSK modulating a packet including a synchronization signal part and a payload part and transmits the transmission signal to a receiver, and the receiver receives the transmission signal and A/D-converts a demodulation signal generated by demodulating a reception signal so as to compare with a reference value, so that a multi-valued digital signal is generated,
wherein the transmitter comprises transmission means for forming the transmission signal by performing multi-valued FSK modulation using only the minimum value and the maximum value in multi-valued FSK with respect to the synchronization signal part of the packet and by performing normal multi-valued FSK modulation with respect to the payload part and for transmitting the transmission signal to the receiver, and wherein the receiver comprises: -
a reception circuit unit for outputting the analog demodulation signal generated by demodulating the reception signal and a binary signal generated by binarizing the analog demodulation signal; and
a baseband processing unit including synchronization establishing means for establishing synchronization based on the binary signal output from the reception circuit unit;
reference value correcting means for correcting the reference value for determining the level of multi-valued FSK based on the digital demodulation signal generated by A/D-converting the analog reception signal in the synchronization signal part in a state that the synchronization establishing means has established synchronization; and
code determining means for generating the multi-valued digital signal by A/D-converting the analog demodulation signal so as to compare with the reference value. - View Dependent Claims (5, 6)
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Specification