Method for the synchronization of a radio receiver, and adapted receiver for the implementation of said method
First Claim
1. A method of synchronizing a radio receiver suitable for receiving coded symbols in the form of radio pulses, each transmitted in a predetermined time slot within a respective frame, said slot being determined by a value selected from a set of ordered values forming a code stored in the receiver, the method comprising the following steps, performed within the receiver:
- a—
detecting received pulses;
b—
storing moments of reception of said pulses;
c—
associating a first value selected from the code with a first received pulse;
d—
selecting a second value from the code;
e—
estimating at least one moment of reception by combining the moment of reception stored for said first received pulse with said first and second selected code values;
f—
if the estimated moment matches the moment of reception stored for a second received pulse, validating the associations of said first and second code values with said first and second received pulses,otherwise repeating steps c to f by varying at least one of said first and second selected code values; and
g—
deducing, from at least one of the values of the code whose selection has been validated, a moment of transmission start for a symbol,wherein, in step f, the moment of reception estimated for a second received pulse matches the moment of reception stored for said second received pulse if an absolute value of a difference between the estimated and stored moments of reception for the second received pulse is less than a predetermined fraction of the duration of a time slot.
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Accused Products
Abstract
A method for the synchronization of a radio receiver, comprising an estimation of the moment when a pulse (11, 17) is received (11, 17), performed from the moment when a previous pulse was received. The estimated moment is compared with the real moment when the pulse (21, 27) is received in order to validate an association of pulses with values of a code recorded in the receiver (31, 37). A moment for the beginning of transmission of a symbol is thus deduced, enabling the receiver to be synchronized in relation to the transmitted radio pulse sequence.
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Citations
18 Claims
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1. A method of synchronizing a radio receiver suitable for receiving coded symbols in the form of radio pulses, each transmitted in a predetermined time slot within a respective frame, said slot being determined by a value selected from a set of ordered values forming a code stored in the receiver, the method comprising the following steps, performed within the receiver:
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a—
detecting received pulses;b—
storing moments of reception of said pulses;c—
associating a first value selected from the code with a first received pulse;d—
selecting a second value from the code;e—
estimating at least one moment of reception by combining the moment of reception stored for said first received pulse with said first and second selected code values;f—
if the estimated moment matches the moment of reception stored for a second received pulse, validating the associations of said first and second code values with said first and second received pulses,otherwise repeating steps c to f by varying at least one of said first and second selected code values; and g—
deducing, from at least one of the values of the code whose selection has been validated, a moment of transmission start for a symbol,wherein, in step f, the moment of reception estimated for a second received pulse matches the moment of reception stored for said second received pulse if an absolute value of a difference between the estimated and stored moments of reception for the second received pulse is less than a predetermined fraction of the duration of a time slot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A synchronization device for a radio receiver, said receiver being suitable for receiving symbols coded in the form of radio pulses, each transmitted in a predetermined time slot within a respective frame, said slot being determined by a value selected from a set of ordered values forming a code stored in the receiver, the synchronization device comprising:
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a—
means for storing moments of reception of pulses;b—
means for selecting values from the code;c—
means for calculating at least one second moment of reception from first and second selected code values and a first moment of reception stored for a first received pulse;d—
means for validating associations of first and second selected code values with first and second received pulses, arranged so as to be activated if a second calculated moment of reception matches the moment of reception stored for the second received pulse; ande—
means for determining a moment of transmission start for a symbol, suitable for determining said start moment from at least one of the code values whose selection has been validated,wherein, in the means for validating associations, the second calculated moment of reception matches the moment of reception stored for the second received pulse if an absolute value of a difference between the calculated and stored moments of reception for the second received pulse is less than a predetermined fraction of the duration of a time slot.
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Specification