Method and device for the automatic selection of the bit rate in high frequency transmissions

• US 7,366,232 B2
• Filed: 10/08/2002
• Issued: 04/29/2008
• Est. Priority Date: 10/09/2001
• Status: Expired due to Fees

• Current Assignee: Thales SA
• Original Assignee: Thales SA
• Inventors: Bruas, Patrick
• Primary Examiner(s): Odom; Curtis B.
• Application Number:
  US10/265,696
• Publication Number:
  US 20030128749A1
• Time in Patent Office: 2,030 Days
• Field of Search: 375229-236
• US Class Current: 375/222
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

A method and device for determining at least one traffic parameter in a data transmission system including at least one transmitter and one receiver, wherein the receiver includes a modem with equalizer. The method includes determining at least one piece of data given by the equalizer, wherein the piece of data includes the equalization error E_i; and determining one or more traffic parameters in taking account of the data provided, the fixed quality of service QoS and a relationship linking the quality of service and the equalization error E_i.

Claims

1. A method for determining at least one traffic parameter in a data transmission system comprising at least one transmitter and a receiver, said receiver including a modem with an equalizer and a decoder as part of a signal processing card, and a management card, the method comprising:

transmitting via a high frequency channel reflected by ionosphere an initial training sequence by using known modulation symbols to said equalizer;

first determining at least one piece of data given by the equalizer, the at least one piece of data including an equalization error E_i of the initial training sequence;

second determining in said management card at least one traffic parameter in taking account of the data provided, a required quality of service QoS, and a relationship linking the required quality of service and the equalization error E_i;

transmitting said at least one traffic parameter to said decoder; and

transmitting traffic information, after said decoder is configured based on said at least one traffic parameter, from said decoder to a user not through said management card.

2. A method according to claim 1, wherein the at least one traffic parameter determined in said second determining includes a transmission bit rate Di.

3. A method according to one of the claims 1 or 2, further comprising:

averaging the equalization error E_i so as to obtain <

E_i>

.

4. A method according to claim 1, wherein the relationship linking the required quality of service QoS and the equalization error E_i is given in the form of a database obtained for different modems with equalizers, the database being pre-established or built during operation.

5. A method according to claim 1, wherein the relationship is formed by different bit rate values corresponding to intervals of given values of bit error rate BER and averaged equalization error <

E_i>

.

6. A method according to claim 1 further comprising:

using an Automatic Link Establishment (ALE) type protocol to obtain several frequency/bit rate pairs; and

selecting a frequency value and/or a bit rate value as a function of decision criteria.

7. A method according to claim 1 , wherein the signals exchanged take a form of a frame comprising a traffic header, and wherein the at least one traffic parameter determined is transmitted in a waveform available in the header.

8. A use of the method according to claim 1 , for the transmission of data in the High Frequency (HF) range.

9. The method according to claim 3, wherein in the averaging, the average equalization error <

E_i>

is standardized by a power of the received signal.

10. The method according to claim 1, wherein in the transmitting, a pre-polling protocol is sent from the at least one transmitter to the receiver, and the method further comprises:

responding to the at least one transmitter with the at least one traffic parameter.

11. A device to determine at least one traffic parameter in a data transmission system comprising:

at least one transmitter;

at least one receiver configured to receive information via a high frequency channel reflected by ionosphere, the receiver comprising at least one modem having a signal processing card, the signal processing card including an equalizer and a decoder; and

a management card configured to determine at least one traffic parameter in taking account of an equalization error E_i given by the equalizer of an initial training sequence, a required value of quality of service QoS, and a relationship linking the quality of service QoS and the equalization error E_i, wherein

said decoder is configured to transmit information to a user not through said management card.

12. A device according to claim 11, further comprising a database integrating the relationship set up between the fixed value QoS and the equalization error E_i.

13. The device according to claim 11, wherein the equalizer is configured to average the equalization error E_i so as to obtain an average equalization error <

E_i>

, and is further configured to standardize the average equalization error <

E_i>

by a power of the received signal.

14. The device according to claim 11, wherein the management card is further configured to respond to a pre-polling protocol by transmitting to the transmitter the at least one traffic parameter.