Pulse position modulation with spread spectrum
First Claim
1. A method of coherent communication, comprising the steps oftransmitting, in each of a plurality of timing windows, a first spread-spectrum pulse during a predefined framing pulse window, said timing windows being of equal time duration;
- selecting, in each of said plurality of timing windows, one of a plurality of data pulse windows, responsive to at least one data bit associated with a particular one of said timing windows; and
transmitting a second spread-spectrum pulse during the selected data pulse window, said second spread-spectrum pulse indicative of one or more bits of serial data.
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Accused Products
Abstract
A method of pulse-position modulation in a spread-spectrum communication system, which is capable of transmitting more than one bit per received and recognized chip sequence in a system in which an entire chip sequence is required to produce a correlation pulse. A framing pulse window in which a framing pulse may be received, and a plurality of data pulse windows in which a data pulse may (or may not) be received. The delay between the framing pulse window and the first data pulse window may comprise an entire chip-sequence duration, while the delay from one data pulse window to the next may be less. A method of pulse-position modulation with more than one spread-spectrum code. A second transmission medium (such as a second spread-spectrum code) on which a data pulse may (or may not) be received. Each possible choice, for the data pulse, of delay time and transmission code may represent a separate set of multiple data bits. A method of transmitting signals in a spread-spectrum communication system in which a spread-spectrum chip sequence may be interrupted with reduced noise. The system may ground the transmitter antenna at the end of a chip sequence when it is desired to delay transmission of the next chip sequence.
39 Citations
15 Claims
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1. A method of coherent communication, comprising the steps of
transmitting, in each of a plurality of timing windows, a first spread-spectrum pulse during a predefined framing pulse window, said timing windows being of equal time duration; -
selecting, in each of said plurality of timing windows, one of a plurality of data pulse windows, responsive to at least one data bit associated with a particular one of said timing windows; and transmitting a second spread-spectrum pulse during the selected data pulse window, said second spread-spectrum pulse indicative of one or more bits of serial data. - View Dependent Claims (2, 3, 4)
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5. A method of communication, comprising the steps of
transmitting, in each of a plurality of timing windows of equal time duration, a first entire spread-spectrum chip sequence timed to end during a predefined framing pulse window; -
selecting, in each of said plurality of timing windows, one of a plurality of data pulse windows, responsive to at least one data bit associated with a particular one of said timing windows; and transmitting a second entire spread-spectrum chip sequence timed to end during the selected data pulse window, said second spread-spectrum chip sequence indicative of one or more bits of serial data.
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6. A system for spread-spectrum communication, comprising
a plurality of timing windows of equal time duration, a predefined framing pulse window in each of said timing windows, during which a spread-spectrum framing pulse is received; a plurality of data pulse windows in each of said timing windows, during each of which a data pulse may be received or not received, wherein receipt of a data pulse in any of said data pulse windows is indicative of a first set of information, and failure to receive a data pulse in any of said data pulse windows is indicative of a second set of information, said first set of information and said second set of information each comprising one or more data bits, a first one of said data pulse windows being offset from said framing pulse window by a predetermined time duration. - View Dependent Claims (7, 8)
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9. A system for spread-spectrum communication, comprising
a plurality of timing windows of equal time duration, a predefined framing pulse window in each of said timing windows, during which a spread-spectrum framing pulse is received; -
a plurality of data pulse windows in each of said timing windows, during each of which a data pulse may be received or not received; each one of said plurality of data pulse windows being offset from said framing pulse window by a predetermined time duration specific to said one data pulse window. - View Dependent Claims (10, 11, 12)
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13. A system for communication, comprising
a timing window; -
a predefined framing pulse window within said timing window, during which a first spread-spectrum signal is received; and a plurality of predefined data pulse windows within said timing window, said data pulse windows following said framing pulse window, wherein receipt of a second spread-spectrum signal during a selected one of said data pulse windows is indicative of a first plurality of serial data bits, and wherein failure to receive said second spread-spectrum signal during one of said data pulse windows is indicative of a second plurality of serial data bits. - View Dependent Claims (14, 15)
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Specification
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Current AssigneeMicron Technology, Inc.
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Original AssigneeOmnipoint Corp. (Deutsche Telekom AG)
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InventorsWilliams, Michael, Peterson, Pete O., Jensen, Ryan N., Vanderpool, Jeffrey S.
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Primary Examiner(s)Cangialosi, Salvatore
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Application NumberUS08/146,490Time in Patent Office1,373 DaysField of Search375/1, 375/200US Class Current375/130CPC Class CodesH04B 1/707 using direct sequence modul...H04B 14/026 using pulse time characteri...
