METHOD FOR DATA COMMUNICATION VIA A VOICE CHANNEL OF A WIRELESS COMMUNICATION NETWORK

• US 20070092024A1
• Filed: 10/24/2005
• Published: 04/26/2007
• Est. Priority Date: 10/24/2005
• Status: Active Grant

• Current Assignee: General Motors LLC (General Motors Company)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Surti, Iqbal, Madhavan, Sethu, Yin, Jijun
• Granted Patent: US 8,194,526 B2
• Time in Patent Office: Days
• US Class Current: 375/283
• CPC Class Codes: H04L 27/2071 in which the data are represented by the carrier phase, e.g. systems with differential coding
• CPC Class Codes: H04L 27/2331 wherein the received signal is demodulated using one or more delayed versions of itself

Abstract

A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel of the communications network. Digital data is encoded into DBPSK data using differential binary phase shift keying encoding. The DBPSK data is then sent across the cellular network using a vocoder having a linear predictive or other speech compression codec. At the receiving end, the DBPSK data is demodulated back into the original digital data. This approach permits data communication via a CDMA, GSM, or other type of voice traffic channel at a low bit error rate.

Claims

1. A method of communicating digital data via a wireless telecommunications network, comprising the steps of:

generating DPSK data from digital data using differential phase shift keying encoding;

transmitting the DPSK data across a voice channel of a wireless telecommunications network;

receiving the DPSK data transmitted via the wireless telecommunications network; and

demodulating the received DPSK data back into the digital data.

2. The method of claim 1, wherein the generating step further comprises generating the DPSK data as DBPSK data using differential binary phase shift keying encoding.

3. The method of claim 2, wherein the transmitting step further comprises obtaining vocoder output data by sending the DBPSK data through a voice encoder and thereafter transmitting the DBSPK data via the voice channel.

4. The method of claim 3, wherein the receiving step further comprises converting the received output data into decoded DBPSK data by sending the received output data through a voice decoder.

5. The method of claim 4, wherein the demodulating step further comprises decoding the DBPSK data back into the digital data.

6. The method of claim 3, wherein said step of obtaining vocoder output data comprises the step of inputting the DBPSK data into a speech compression circuit that exhibits a time-varying, non-linear transfer function and that at least partially filters out non-speech components of the inputted data.

7. The method of claim 2, wherein said generating step further comprises encoding the digital data using differential binary phase shift keying encoding at a carrier frequency within the range of 1 Hz to 4,000 Hz.

8. The method of claim 7, wherein said generating step further comprises encoding the digital data at a bit rate within the range of 250 bits/sec to 3,000 bits/sec.

9. The method of claim 2, wherein said generating step further comprises encoding the digital data using differential binary phase shift keying encoding at a carrier frequency within the range of 400 Hz to 2,500 Hz.

10. The method of claim 2, wherein said generating step further comprises encoding the digital data using differential binary phase shift keying encoding at a carrier frequency of 500 Hz and at a bit rate of 500 bits/sec.

11. A method of transmitting digital data via a wireless telecommunications network that includes a time-varying, non-linear speech compression circuit, the method comprising the steps of:

modulating digital data using differential binary phase shift keying;

inputting the modulated digital data into a speech compression circuit that exhibits a time-varying, non-linear transfer function and that at least partially filters out non-speech components of the inputted data;

obtaining an encoded output from the speech compression circuit;

transmitting the encoded output via an antenna.

12. A method of encoding digital data for transmission via a voice traffic channel of a wireless telecommunications network, comprising the steps of:

generating DPSK data by encoding digital data using differential phase shift keying encoding; and

applying a linear predictive coding to the DPSK data.

13. The method of claim 12, wherein said generating step further comprises encoding the digital data using differential binary phase shift keying encoding at a carrier frequency within the range of 1 Hz to 4,000 Hz.

14. The method of claim 13, wherein said generating step further comprises encoding the digital data at a bit rate within the range of 250 bits/sec to 3,000 bits/sec.

15. The method of claim 12, wherein said generating step further comprises encoding the digital data using differential binary phase shift keying encoding at a carrier frequency within the range of 400 Hz to 2,500 Hz.

16. The method of claim 12, wherein said generating step further comprises encoding the digital data using differential binary phase shift keying encoding at a carrier frequency of 500 Hz and at a bit rate of 500 bits/sec.

17. The method of claim 12, wherein said applying step further comprises encoding the DPSK data with an RPE-LPC codec.

18. The method of claim 12, wherein said applying step further comprises encoding the DPSK data with a CELP codec.

19. The method of claim 18, wherein said CELP codec is a variable rate CELP codec.

20. The method of claim 12, wherein said applying step further comprising encoding the DPSK data with a speech compression circuit that exhibits a time-varying, non-linear transfer function and that at least partially filters out non-speech components of the inputted data.