Transmission method and radio system
First Claim
1. A data transmission method used in a radio system comprising at least a base station and a terminal which include a transmitter and a receiver for signal transmission and reception, in which data transmission method a signal is transmitted in bursts which comprise a training sequence (404, 412), it is possible to use at least two predetermined modulation methods for a signal that is to be transmitted, and the modulation method used is interchangeable to another predetermined modulation method, characterized in thatwhen the transmitted signal is received it is demodulated in the manner corresponding to each modulation method;
- an impulse response estimate which corresponds to each modulation method used is formed for the received signal; and
the modulation method which is used for the transmitted signal is inferred from the impulse response estimate and the signal according to the inferred modulation method is selected to be detected.
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Accused Products
Abstract
The invention relates to a data transmission method and a radio system implementing method. A transmitter has at least two modulation methods by which it can modulate a signal. One or more demodulators (106) of the receiver demodulates the received signal in a manner which corresponds to each modulation method used. The modulation method used for the signal is inferred in a reference block (110) from the impulse response estimate. The signal according to the inferred modulation method is detected in a detector (114).
19 Citations
21 Claims
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1. A data transmission method used in a radio system comprising at least a base station and a terminal which include a transmitter and a receiver for signal transmission and reception, in which data transmission method a signal is transmitted in bursts which comprise a training sequence (404, 412), it is possible to use at least two predetermined modulation methods for a signal that is to be transmitted, and the modulation method used is interchangeable to another predetermined modulation method, characterized in that
when the transmitted signal is received it is demodulated in the manner corresponding to each modulation method; -
an impulse response estimate which corresponds to each modulation method used is formed for the received signal; and
the modulation method which is used for the transmitted signal is inferred from the impulse response estimate and the signal according to the inferred modulation method is selected to be detected. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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2. A data transmission method used in a radio system comprising at least a base station and a terminal which include a transmitter and a receiver for signal transmission and reception, in which data transmission method a signal is transmitted in bursts which comprise a training sequence (404, 412), it is possible to use at least two predetermined modulation methods for a signal that is to be transmitted, and the modulation method used is interchangeable to another predetermined modulation method, characterized in that
when the transmitted signal is received it is demodulated by only one demodulation method; -
an impulse response estimate which corresponds to each modulation method used is formed for the received signal; and
the modulation method used for the transmitted signal is inferred from the impulse response estimate and the signal is detected. - View Dependent Claims (3)
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12. A radio system comprising at least a base station and a terminal which include a transmitter and a receiver for signal transmission and reception, in which radio system the transmitter is arranged to transmit a signal in bursts which comprise a training sequence (404, 412), it is possible to use at least two predetermined modulation methods for a signal that is to be transmitted, and the modulation method used is interchangeable to another predetermined modulation method, characterized in that the receiver comprises
at least a demodulator (106, 206) for demodulating the received signal in the manner corresponding to each modulation method used; -
means (108) for forming an impulse response estimate which corresponds to each modulation method used;
means (112) for selecting a demodulated signal for the detector (114);
means (110) for inferring from the impulse response estimate the modulation method which is used for the transmitted signal and for controlling the means (112) to select for the detector (114) a signal which is correspondingly demodulated. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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13. A radio system comprising at least a base station and a terminal which include a transmitter and a receiver for signal transmission and reception, in which radio system the transmitter is arranged to transmit a signal in bursts which comprise a training sequence (404, 412), it is possible to use at least two predetermined modulation methods for a signal that is to be transmitted, and the modulation method which is used is interchangeable to another predetermined modulation method, characterized in that the receiver comprises
only one demodulator (206); -
means (208) for forming an impulse response estimate which corresponds to each modulation method used;
means (210) for inferring from the impulse response estimate the modulation method which is used for the transmitted signal;
a detector (212) for detecting the signal, and the transmitter is arranged to use modulation methods which the one demodulator (206) of the receiver is able to demodulate.
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Specification