System and method for improved communication utilizing velocity related information

• US 8,369,445 B2
• Filed: 12/04/2008
• Issued: 02/05/2013
• Est. Priority Date: 12/04/2008
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Hensley, Marion P.
• Primary Examiner(s): KASSA, ZEWDU A
• Application Number:
  US12/328,316
• Publication Number:
  US 20100142646A1
• Time in Patent Office: 1,524 Days
• Field of Search: 375/295, 375/316, 375/219, 342/352, 342/354, 342/353, 342/175, 455/12, 455/13, 455/63, 455/71
• US Class Current: 375/295
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 2027/0044 Control loops for carrier regulation
• CPC Class Codes: H04L 2027/0093 Intermittant signals
• CPC Class Codes: H04L 27/0014 Carrier regulation of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657

Abstract

According to one embodiment, a method for communication includes receiving, by a receiver, a first modulated signal. The first modulated signal includes at least one error. The method also includes demodulating the first modulated signal. The demodulation includes compensating for the at least one error utilizing information related to a velocity of the receiver.

Claims

1. A method for communication, the method comprising:

receiving, by a receiver, a first pre-distorted modulated signal sent by a transmitter, the first pre-distorted modulated signal comprising Doppler error and a first transmitter velocity vector corresponding to movement of the transmitter with respect to the receiver, wherein the first pre-distorted modulated signal is pre-distorted prior to its being received at the receiver, wherein the pre-distorting comprises adjusting the first modulated signal by a first increment to compensate for a first predicted velocity based error in the first modulated signal;

receiving, by the receiver, a second pre-distorted modulated signal sent by the transmitter, the second pre-distorted modulated signal comprising Doppler error and a second transmitter velocity vector corresponding to movement of the transmitter with respect to the receiver, wherein the second pre-distorted modulated signal is pre-distorted prior to its being received at the receiver, wherein the pre-distorting comprises adjusting the second modulated signal by a second increment to compensate for a second predicted velocity based error in the second modulated signal, wherein the second increment is different than the first increment;

receiving at least one further transmitter velocity vector at a rate depending at least in part upon change of the Doppler error due to movement of the transmitter with respect to the receiver; and

if a first predetermined condition exists, compensating for at least one velocity-based error in at least one of the first and second pre-distorted modulated signals by demodulating the first and second pre-distorted modulated signals and at least the at least one further transmitter velocity vector, the demodulation comprising using at least one of the first and further transmitter velocity vectors for frequency adjustment to compensate for the Doppler error of at least one of the received first and second pre-distorted modulated signal.

2. The method of claim 1, wherein the information related to the velocity of the receiver comprises the velocity of the receiver with respect to the Earth.

3. The method of claim 1, wherein the first and farther transmitter velocity vectors are transmitted by the transmitter to a third node and then to the receiver.

4. The method of claim 1, further comprising, if the predetermined condition exists, compensating for the at least one velocity-based error in accordance with at least one threshold.

5. The method of claim 1, wherein the first predetermined condition comprises at least one of the following conditions:

(a) a relative velocity vector, computed based at least in part on at least one of the first and further transmitter velocity vectors, exceeds a first predetermined threshold;

(b) a predicted velocity vector, computed without use of the at least one of the first and further transmitter velocity vectors, exceeds a second predetermined threshold;

(c) the rate of receiving the at least one of the further transmitter velocity vectors meets the conditions of a predetermined rate threshold;

(d) the communication of at least one of the first pre-distorted modulated signal, second pre-distorted modulated signal, first transmitter velocity vector, and further transmitter velocity vector, occurs during a predetermined time;

(e) at least one of the first and second pre-distorted modulated signals is sent using a protocol susceptible to velocity-based error and, based on the velocity of at least one of the transmitter and receiver, application of compensation provides sufficient compensation for velocity-based errors so as to enable data communication using a high data rate algorithm; and

(f) a node in operable communication with at least one of the receiver and the transmitter has requested that compensation for velocity based error be applied to a communication session between the receiver and the transmitter.

6. The method of claim 1, further comprising demodulating at least one of the first and second pre-distorted modulated signals without performing frequency adjustment to compensate for Doppler error, if at least one of the following second predetermined conditions exists:

(a) the predetermined first condition does not exist;

(b) the predetermined first condition no longer exists;

(c) a node in operable communication with at least one of the receiver and the transmitter has indicated mat compensation for Doppler or velocity based error does not have to be applied to a communication session between the receiver and the transmitter;

(d) the pre-distortion of the at least one of the first and second pre-distorted modulated signals is sufficient to account for at least a first predicted velocity error; and

(e) based upon a first frequency adjustment applied using at least a first received transmitter velocity vector, a second predicted velocity error for at least one of the first and second pre-distorted modulated signals indicates that a second frequency adjustment is not necessary.

7. A system for communication, the system comprising:

a first node operable to;

receive, by a receiver, a first pre-distorted modulated signal sent by a transmitter, the first pre-distorted modulated signal comprising Doppler error and a first transmitter velocity vector corresponding to movement of the transmitter with respect to the receiver, wherein the first pre-distorted modulated signal is pre-distorted prior to its being received at the receiver, wherein the pre-distorting comprises adjusting the first modulated signal by a first increment to compensate for a first predicted velocity based error in the first modulated signal;

receiving, by the receiver, a second pre-distorted modulated signal sent by the transmitter, the second pre-distorted modulated signal comprising Doppler error and a second transmitter velocity vector corresponding to movement of the transmitter with respect to the receiver, wherein the second pre-distorted modulated signal is pre-distorted prior to its being received at the receiver, wherein the pre-distorting comprises adjusting the second modulated signal by a second increment to compensate for a second predicted velocity based error in the second modulated signal, wherein the second increment is different than the first increment;

receive at least one further transmitter velocity vector at a rate depending at least in part upon change of the Doppler error due to movement of the transmitter with respect to the receiver;

determine whether a predetermined condition exists; and

if the predetermined condition exists, demodulate the first and second pre-distorted modulated signals and the at least one further transmitter velocity vector, the demodulation comprising using at least one of the first and further transmitter velocity vectors for frequency adjustment to compensate for the Doppler error of at least one of the received first and second pre-distorted modulated signal.

8. The system of claim 7, wherein the information related to the velocity of the first node comprises the velocity of the first node with respect to the Earth.

9. The system of claim 7, wherein the information related to the velocity of the first node comprises a velocity of a second node that transmits the first modulated signal to the first node.

10. The system of claim 7, wherein the information related to the velocity of the first node comprises a relative velocity vector with respect to the velocity of the first node and the velocity of a second node that transmits the first modulated signal.

11. The method of claim 7, wherein the predetermined condition comprises at least one of the following conditions:

(a) a relative velocity vector, computed based at least in part on at least one of the first and further transmitter velocity vectors, exceeds a first predetermined threshold;

(b) a predicted velocity vector, computed without use of the at least one of the first and further transmitter velocity vectors, exceeds a second predetermined threshold;

(c) the rate of receiving the at least one of the further transmitter velocity vectors meets the conditions of a predetermined rate threshold;

(d) the communication of at least one of the first pre-distorted modulated signal, second pre-distorted modulated signal, first transmitter velocity vector, and further transmitter velocity vector, occurs during a predetermined time;

(e) at least one of the first and second pre-distorted modulated signals is sent using a protocol susceptible to velocity-based error and, based on the velocity of at least one of the transmitter and receiver, application of compensation provides sufficient compensation for velocity-based errors so as to enable data communication using a high data rate algorithm; and

(f) a second node in operable communication with at least one of the receiver and the transmitter has requested that compensation for velocity based error be applied to a communication session between the receiver and the transmitter.

12. The method of claim 7, wherein the receiving of a further transmitter velocity vector is further dependent upon whether one or more of the first node and a second node mat transmits the first and second pre-distorted modulated signals to the first node has requested a transmitter velocity vector.

13. The method of claim 7, further comprising retrieving, by one or both of the first node that receives the first and second pre-distorted modulated signals and a second node that transmits the first and second pre-distorted modulated signals, at least one further transmitter velocity vector, wherein the retrieving of the further transmitter velocity vector is performed if it is determined mat at least one of the first and second pre-distorted modulated signals is susceptible to velocity-based error.

14. The method of claim 7, wherein at least a first portion of one of the first and further transmitter velocity vectors received at the receiver comprises a velocity vector from a first sensor disposed at the first node, and at least a second portion of one of the first and further transmitter velocity vectors received at the receiver comprises velocity vectors from a second sensor disposed at a second node separate from the first node, wherein the first node communicates with the second node, and where there is relative movement between the first node and the second node.

15. A method for communication, the method comprising:

generating, by a transmitter, a first pre-distorted modulated signal for transmission to a receiver, the first pre-distorted modulated signal comprising Doppler error and a first transmitter velocity vector corresponding to movement of the transmitter with respect to the receiver, wherein the first pre-distorted modulated signal is pre-distorted prior to its being received at the receiver, wherein the pre-distorting comprises adjusting the first modulated signal by a first increment to compensate for a first predicted velocity based error in the first modulated signal;

generating, by the transmitter, a second pre-distorted modulated signal, the second pre-distorted modulated signal comprising Doppler error and a second transmitter velocity vector corresponding to movement of the transmitter with respect to the receiver, wherein the second pre-distorted modulated signal is pre-distorted prior to its being received at the receiver, wherein the pre-distorting comprises adjusting the second modulated signal by a second increment to compensate for a second predicted velocity based error in the second modulated signal, wherein the second increment is different than the first increment; and

generating further transmitter velocity vectors at a rate dependent at least in part upon change of the Doppler error due to movement of the transmitter with respect to the receiver;

wherein, if a predetermined condition exists, the receiver uses the first and second pre-distorted modulated signals and the further transmitter velocity vectors for frequency adjustment to compensate for the Doppler error of the received signals.

16. The method of claim 15, wherein the information related to the velocity of the transmitter comprises the velocity of the transmitter with respect to the Earth.

17. The method of claim 15, wherein the predetermined condition comprises at least one of the following conditions:

(a) a relative velocity vector, computed based at least in part on at least one of the first and further transmitter velocity vectors, exceeds a first predetermined threshold;

(b) a predicted velocity vector, computed without use of the at least one of the first and further transmitter velocity vectors, exceeds a second predetermined threshold;

(c) the rate of receiving the at least one of the further transmitter velocity vectors meets the conditions of a predetermined rate threshold;

(d) the communication of at least one of the first pre-distorted modulated signal, second pre-distorted modulated signal, first transmitter velocity vector, and further transmitter velocity vector, occurs during a predetermined time;

(e) at least one of the first and second pre-distorted modulated signals is sent using a protocol susceptible to velocity-based error and, based on the velocity of at least one of the transmitter and receiver, application of compensation provides sufficient compensation for velocity-based errors so as to enable data communication using a high data rate algorithm; and

(f) a node in operable communication with at least one of the receiver and the transmitter has requested that compensation for velocity based error be applied to a communication session between the receiver and the transmitter.

18. The method of claim 15, further comprising demodulating at least one of the first and second pre-distorted modulated signals without performing frequency adjustment to compensate for Doppler error, if at least one of the following second predetermined conditions exists:

(a) the predetermined first condition does not exist;

(b) the predetermined first condition no longer exists;

(c) a node in operable communication with at least one of the receiver and the transmitter has indicated that compensation for Doppler or velocity based error does not have to be applied to a communication session between the receiver and the transmitter;

(d) the pre-distortion of the at least one of the first and second pre-distorted modulated signals is sufficient to account for at least a first predicted velocity error; and

(e) based upon a frequency adjustment applied to at least a first received transmitter velocity vector, a second predicted velocity error for the at least one of the first and second pre-distorted modulated signals indicates that frequency adjustment is not necessary.

19. A system for communication, the system comprising:

a first node operable to;

;

generate, by a transmitter, a first pre-distorted modulated signal for transmission to a receiver, the first pre-distorted modulated signal comprising Doppler error and a first transmitter velocity vector corresponding to movement of the transmitter with respect to the receiver, wherein the first pre-distorted modulated signal is pre-distorted prior to its being received at the receiver, wherein the pre-distorting comprises adjusting the first modulated signal by a first increment to compensate for a first predicted velocity based error in the first modulated signal;

generate, by the transmitter, a second pre-distorted modulated signal, the second pre-distorted modulated signal comprising Doppler error and a second transmitter velocity vector corresponding to movement of the transmitter with respect to the receiver, wherein the second pre-distorted modulated signal is pre-distorted prior to its being received at the receiver, wherein die pre-distorting comprises adjusting the second modulated signal by a second increment to compensate for a second predicted velocity based error in the second modulated signal wherein the second increment is different than the first increment; and

generate further transmitter velocity vectors at a rate dependent at least in part upon change of the Doppler error due to movement of the transmitter with respect to the receiver;

wherein, if a predetermined condition exists, the first and second pre-distorted modulated signals and the further transmitter velocity vectors are configured to enable the receiver to use the transmitter-velocity vectors-for frequency adjustment to compensate for the Doppler error of the received signals.

20. The system of claim 19, wherein the information related to the velocity of the transmitter comprises the velocity of the transmitter with respect to the Earth.

21. The system of claim 19, wherein the predetermined condition comprises at least one of the following conditions:

(a) a relative velocity vector, computed based at least in part on at least one of the first and further transmitter velocity vectors, exceeds a first predetermined threshold;

(b) a predicted velocity vector, computed without use of the at least one of the first and further transmitter velocity vectors, exceeds a second predetermined threshold;

(c) the rate of receiving the at least one of the further transmitter velocity vectors meets the conditions of a predetermined rate threshold;

(d) the communication of at least one of the first pre-distorted modulated signal, second pre-distorted modulated signal, first transmitter velocity vector, and further transmitter velocity vector, occurs during a predetermined time;

(e) at least one of the first and second pre-distorted modulated signals is sent using a protocol susceptible to velocity-based error and, based on the velocity of at least one of the transmitter and receiver, application of compensation provides sufficient compensation for velocity-based errors so as to enable data communication using a high data rate algorithm; and

(f) a second node in operable communication with at least one of the receiver and the transmitter has requested that compensation for velocity based error be applied to a communication session between the receiver and the transmitter.

22. The system of claim 19, wherein the first node is former configured to generate further transmitter velocity vectors dependent whether one or more of the first node and a second node that receives the first and second pre-distorted modulated signals from the first node, has requested a transmitter velocity vector.

23. The system of claim 19, wherein the first node is further configured to generate at least one further transmitter velocity vector, if it is determined, by either the first node or a second node that receives the first and second pre-distorted modulated signals, that at least one of the first and second pre-distorted modulated signals is susceptible to velocity-based error.

24. The method of claim 19, wherein at least a first portion of one of the first and further transmitter velocity vectors generated by the transmitter comprises a velocity vector from a first sensor disposed at the first node, and at least a second portion of one of the first and further transmitter velocity vectors sent to the receiver comprises velocity vectors from a second sensor disposed at a second node separate from the first node, wherein the first node communicates with the second node, and where there is relative movement between the first node and the second node.