TDMA system with a virtual reference
First Claim
1. A method of timing the transmission of a burst from a transmitting station in a TDMA system comprising the steps of:
- a) detecting bursts located in a TDMA frame received at the transmitting station;
b) monitoring the locations in said received bursts of unique words contained in said received bursts;
c) deriving, in response to said monitoring step, a virtual frame reference; and
,d) timing the transmission of at least one burst transmitted from the transmitting station based on the virtual frame reference derived in said deriving step.
14 Assignments
0 Petitions
Accused Products
Abstract
A TDMA system operates without the requirement for a reference burst. A station in the TDMA system monitors the bursts from other stations to determine the virtual reference. The virtual reference is then used as the basis, at the station, for transmitting its own burst. For carrier-based TDMA systems, the station can also determine a virtual carrier reference. This is implemented by measuring the received carrier from a plurality of bursts. The received carrier frequency of all of the bursts that have been received can then be averaged, and after correcting for frequency translation introduced by the transponder, the result can be employed as a virtual carrier reference.
26 Citations
22 Claims
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1. A method of timing the transmission of a burst from a transmitting station in a TDMA system comprising the steps of:
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a) detecting bursts located in a TDMA frame received at the transmitting station; b) monitoring the locations in said received bursts of unique words contained in said received bursts; c) deriving, in response to said monitoring step, a virtual frame reference; and
,d) timing the transmission of at least one burst transmitted from the transmitting station based on the virtual frame reference derived in said deriving step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of synchronizing a carrier frequency of a transmitting station in a TDMA system comprising the steps of:
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a) detecting, at said transmitting station, received bursts in a TDMA frame, each burst having a carrier frequency; b) monitoring the carrier frequencies of the received bursts; c) deriving, in response to said monitoring step, a virtual carrier frequency reference; and
,d) transmitting, from the transmitting station, at least one burst with a carrier frequency based on said virtual carrier frequency reference. - View Dependent Claims (11, 12, 13, 14, 15, 22)
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16. Apparatus for timing a transmission of a burst from a transmitting station in a TDMA system, comprising:
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(a) means for detecting bursts located in a TDMA frame received at the transmitting station; (b) means for monitoring the location in said received bursts of unique words contained in said received bursts; (c) means for deriving, from the monitoring means, a virtual frame reference; and (d) means for transmitting from the transmitting station at least one burst based on the virtual frame reference produced by said means for deriving. - View Dependent Claims (17, 18)
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19. Apparatus for synchronizing a carrier frequency of a transmitting station in a TDMA system comprising:
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(a) means at the transmitting station for detecting received bursts in a TDMA frame, each burst having a carrier frequency; (b) means for monitoring the carrier frequencies of the received bursts; (c) means for deriving from the monitoring means a virtual carrier frequency reference; and (d) means for transmitting from the transmitting station at least one burst with a carrier frequency based on said virtual carrier frequency reference. - View Dependent Claims (20, 21)
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Specification