SYSTEM AND METHOD OF AN IN-BAND MODEM FOR DATA COMMUNICATIONS OVER DIGITAL WIRELESS COMMUNICATION NETWORKS
First Claim
1. A method of controlling bidirectional data transmissions from a destination terminal in an in-band communication system, the method comprising:
- transmitting a send signal from the destination terminal;
discontinuing transmission of the send signal upon detection of a first received signal, wherein the first received signal indicates a successful reception of the send signal from a source terminal;
transmitting a synchronization signal from the destination terminal;
transmitting a user data segment from the destination terminal using a first modulation scheme; and
discontinuing transmission of the user data segment upon detection of a second received signal, wherein the second received signal indicates a successful reception of the user data segment from the source terminal.
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Accused Products
Abstract
A system is provided for transmitting information through a speech codec (in-band) such as found in a wireless communication network. A modulator transforms the data into a spectrally noise-like signal based on the mapping of a shaped pulse to predetermined positions within a modulation frame, and the signal is efficiently encoded by a speech codec. A synchronization sequence provides modulation frame timing at the receiver and is detected based on analysis of a correlation peak pattern. A request/response protocol provides reliable transfer of data using message redundancy, retransmission, and/or robust modulation modes dependent on the communication channel conditions.
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Citations
19 Claims
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1. A method of controlling bidirectional data transmissions from a destination terminal in an in-band communication system, the method comprising:
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transmitting a send signal from the destination terminal; discontinuing transmission of the send signal upon detection of a first received signal, wherein the first received signal indicates a successful reception of the send signal from a source terminal; transmitting a synchronization signal from the destination terminal; transmitting a user data segment from the destination terminal using a first modulation scheme; and discontinuing transmission of the user data segment upon detection of a second received signal, wherein the second received signal indicates a successful reception of the user data segment from the source terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for controlling bidirectional data transmissions from a destination terminal in an in-band communication system comprising:
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a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being capable of executing the steps of; transmitting a send signal from the destination terminal; discontinuing transmission of the send signal upon detection of a first received signal, wherein the first received signal indicates a successful reception of the send signal from a source terminal; transmitting a synchronization signal from the destination terminal; transmitting a user data segment from the destination terminal using a first modulation scheme; and discontinuing transmission of the user data segment upon detection of a second received signal, wherein the second received signal indicates a successful reception of the user data segment from the source terminal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for controlling bidirectional data transmissions from a destination terminal in an in-band communication system comprising:
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means for transmitting a send signal from the destination terminal; means for discontinuing transmission of the send signal upon detection of a first received signal, wherein the first received signal indicates a successful reception of the send signal from a source terminal; means for transmitting a synchronization signal from the destination terminal; means for transmitting a user data segment from the destination terminal using a first modulation scheme; and means for discontinuing transmission of the user data segment upon detection of a second received signal, wherein the second received signal indicates a successful reception of the user data segment from the source terminal. - View Dependent Claims (18, 19)
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Specification