System and method of an in-band modem for data communications over digital wireless communication networks

US8958441B2 · kind B2 · utility

Assignee

• QUALCOMM Incorporated · US

Inventors

• Marc W. Werner · Nuremberg, DE
• Christian Pietsch · Nuremberg, DE
• Christian Sgraja · Achern, DE
• Wolfgang Granzow · Heroldsberg, DE
• Nikolai Konrad Leung · Takoma Park, US
• Christoph Arnold Joetten · Bitburg, DE
• Pengjun Huang · San Diego, US

Key dates

• Filing date: Jun 3, 2009
• Grant date: Feb 17, 2015
• Expiry date: Jan 30, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L1/1607
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

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.