SYSTEM AND METHOD OF AN IN-BAND MODEM FOR DATA COMMUNICATIONS OVER DIGITAL WIRELESS COMMUNICATION NETWORKS

    公开(公告)号:SG191622A1

    公开(公告)日:2013-07-31

    申请号:SG2013041405

    申请日:2009-06-05

    Applicant: QUALCOMM INC

    Abstract: SYSTEM AND METHOD OF AN IN-BAND MODEM FOR DATA COMMUNICATIONS OVER DIGITAL WIRELESS COMMUNICATION NETWORKSA system is provided for transmitting information through a speech codec (in-band) such as found in a wireless communication network. A modulator transfon-ns 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.Figure 1

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