Fade recovery in digital message transmission systems
First Claim
1. A method of fade recovery in a digital message transmission system in which data is encoded into code words, formatted into frames of a batch and transmitted in accordance with one or more transmission formats, and a synchronization code word, indicative of the transmission format, is inserted at the beginning of each batch, the method of fade recovery comprising:
- energizing a receiver for a first predetermined time period and storing any signals received during said first predetermined time period, analyzing said stored signals to determine if the stored signals being transmitted is in one of said transmission formats, and if so, maintaining energization of the receiver in predetermined time increments for up to a maximum of a second predetermined time period and checking if any of the stored signals associated with each such time increment conform to at least one of said transmission formats.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of fade recovery in a digital message transmission system in which data is encoded into code words, formatted into frames of a batch and transmitted in accordance with one or more transmission formats, and a synchronization code word, indicative of the transmission format, is inserted at the beginning of each batch, the method of fade recovery including energizing a receiver for a first predetermined time period and storing any signals received during the first predetermined time period, analyzing the stored signals to determine if the stored signals being transmitted is in one of the transmission formats, and if so, maintaining energization of the receiver in predetermined time increments for up to a maximum of a second predetermined time period and checking if any of the stored signals associated with each such time increment conform to at least one of the transmission formats.
7 Citations
23 Claims
-
1. A method of fade recovery in a digital message transmission system in which data is encoded into code words, formatted into frames of a batch and transmitted in accordance with one or more transmission formats, and a synchronization code word, indicative of the transmission format, is inserted at the beginning of each batch, the method of fade recovery comprising:
energizing a receiver for a first predetermined time period and storing any signals received during said first predetermined time period, analyzing said stored signals to determine if the stored signals being transmitted is in one of said transmission formats, and if so, maintaining energization of the receiver in predetermined time increments for up to a maximum of a second predetermined time period and checking if any of the stored signals associated with each such time increment conform to at least one of said transmission formats. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 13. A digital message transmission system comprising means for encoding data into code words, means for formatting the code words into frames of a batch, means for inserting a synchronization code word at the beginning of each batch, said synchronization code word being selected to be indicative of one or more of the transmission formats of the code words in the said batch, means for transmitting the batches in accordance with the desired transmission formats, and receiving means having a receiver for receiving the transmissions and control means for controlling the operation of the receiving means, the control means including transmission detection means responsive to the loss of received signal, the transmission detection means comprising means for energizing the receiver for a first predetermined time period, means for storing any signals received during a first predetermined period, means for analyzing said stored signals, means responsive to the stored signals having a format which resembles one or more predetermined transmission formats for maintaining energization of the receiver in predetermined time increments up to a maximum of a second predetermined time period, said analyzing means checking the currently stored signals to determine whether any of the stored signals conform to at least one of said predetermined transmission formats.
- 19. A selective call receiver for use in a digital message transmission system including means for encoding data into code words, means for formatting the code words into frames of a batch, means for inserting a synchronization code word at the beginning of each batch, said synchronization code word being selected to be indicative of a transmission format of the code words in the said batch, comprising receiving means having a receiver for receiving the transmissions and control means for controlling the operation of the receiving means, the control means including transmission detection means responsive to the loss of received signal, the transmission detection means comprising means for energizing the receiver for a first predetermined time period, means for storing any signals received during the first predetermined period, means for analyzing said stored signals, means responsive to the stored signals having a format which resembles one or more predetermined transmission formats for maintaining energization of the receiver in predetermined time increments up to a maximum of a second predetermined time period, said analyzing means checking the currently stored signal sample to see if it conforms to one of said predetermined transmission formats.
-
21. A method of fade recovery in a digital message transmission system in which data is encoded into code words and transmitted pursuant to one or more transmission formats, the method of fade recovery comprising:
-
energizing a receiver for and storing any signals received during a first time period; determining whether said stored signals were transmitted in one of said transmission formats, and if so; maintaining energization of the receiver in predetermined time increments for up to a maximum of a second time period; and
during each time increment checking if any of the stored signals associated with each such time increment conforms to at least one of said transmission formats.
-
-
22. A digital message transmission system comprising;
-
means for encoding data into code words, formatting the code words into frames of a batch and for inserting a synchronization code word at the beginning of each batch, said synchronization code word being indicative of one or more of the transmission formats of the code words in said batch; means for transmitting the batches in one of said transmission formats and a receiver for receiving said transmissions; means for energizing the receiver for a first time period and means for storing any signals received during said first time period; means for determining whether said stored signals were transmitted in one of said transmission formats; means for maintaining energization of the receiver in predetermined time increments up to a maximum of a second time period; and means for checking the stored signals to determine whether any of the stored signals conform to at least one of said transmission formats.
-
-
23. A selective call receiver for use in a digital message transmission system including means for encoding data into code words, means for formatting the code words into frames of a batch, means for inserting a synchronization code word at the beginning of each batch, said synchronization code word being selected to be indicative of the transmission format of the code words in the batch, and means for transmitting said batches in one of said transmission formats, said receiver comprising:
-
means for receiving the transmissions; means for energizing the receiver for a first time period and means for storing any signals received during the first time period; means for determining whether said stored signals are in one of said transmission formats; means for maintaining energization of the receiver in predetermined time increments up to a maximum of a second time period; and means for checking the currently stored signals to determine if it conforms to one of said transmission formats.
-
Specification