Fast adaptive transceiver architecture with symmetric preamble design

• US 7,075,975 B2
• Filed: 12/11/2000
• Issued: 07/11/2006
• Est. Priority Date: 12/11/2000
• Status: Expired due to Fees

• Current Assignee: L-3 Communications Titan Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Titan (L3Harris Technologies, Inc.)
• Inventors: Loan, Asim, Lai, Dennis T.
• Primary Examiner(s): Le, Amanda T.
• Assistant Examiner(s): WARE, CICELY Q
• Application Number:
  US09/735,374
• Publication Number:
  US 20020075947A1
• Time in Patent Office: 2,038 Days
• Field of Search: 375/219, 455/227, 455/561, 370/338, 370/469
• US Class Current: 375/219
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/12 by using return channel
• CPC Class Codes: H04L 7/041 using special codes as synchronising signal
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00

Abstract

Each of first and second stations, in communicating with the other station, provides a preamble including forward link parameters and reverse link parameters. The forward link parameters in each preamble for each individual station are provided for each station in accordance with the reverse link parameters previously transmitted to the station in packets from the other station. The reverse link parameters in each preamble in each individual station provide an indication to the other station of the forward link parameters to be provided by the other station in the next transmission of a packet to the individual station from the other station. Data is provided in packets at each station to be transmitted to the other station. Each packet transmitted by each station to the other station includes a preamble and includes data after the preamble.

Claims

1. A method of communicating between first and second stations, including the steps of:

providing at the first station a first preamble including first reverse link parameters and first forward link parameters individual to the first station and providing first data after the preamble,

transmitting the first preamble and the first data from the first station to the second station in accordance with the first forward link parameters in the first preamble,

receiving the first preamble and the first data at the second station and recovering the first data at the second station,

providing a second preamble and second data at the second station, the second preamble at the second station including second forward link parameters in accordance with the first reverse link parameters received at the second station from the first station and including second reverse link parameters, and

transmitting the second preamble including the second forward link parameters and second reverse link parameters and the second data from the second station to the first station.

2. A method as set forth in claim 1, including the steps of:

receiving at the first station the second preamble including the second forward link parameters and the second reverse link parameters and the second data from the second station and recovering the second data at the first station in accordance with the second forward link parameters in the second preamble from the second station.

3. A method as set forth in claim 2, including the steps of:

providing at the first station a third preamble and third data after the third preamble, the third preamble including third reverse link parameters individual to the first station and third forward link parameters corresponding to the second reverse link parameters and the third data constituting new data individual to the first station, and

transmitting the third preamble including the third reverse link parameters and the third forward link parameters corresponding to the second reverse link parameters and the third data to the second station.

4. A method as set forth in claim 3, including the steps of:

receiving at the second station the third preamble including the third reverse link parameters and the third forward link parameters and the third data and recovering the third data,

providing a fourth preamble and fourth data at the second station, the fourth preamble at the second station including fourth forward link parameters in accordance with the third reverse link parameters received at the second station from the first station and also including fourth reverse link parameters, and

transmitting the fourth preamble including the fourth reverse link parameters and the fourth forward link parameters and the fourth data from the second station to the first station.

5. A method as set forth in claim 1, including the steps of:

providing a higher layer network in the fourth preamble at the second station in place of the third reverse link parameters received at the second station to constitute the fourth forward link parameters in the next preamble transmitted by the second station to the first station.

6. A method as set forth in claim 1, including the steps of:

providing at the first station a preamble including reverse link parameters individual to the first station and providing data after the preamble,

transmitting the preamble and the data from the first station to the second station,

receiving the preamble and the data at the second station and recovering the data at the second station,

providing a preamble and data at the second station, the preamble including forward link parameters in accordance with the reverse link parameters received at the second station from the first station,

transmitting the preamble and data from the second station to the first station,

providing at the second station a channel estimation from the preamble and the data received at the second station,

providing a reverse link parameters assessment at the second station in accordance with the data received at the second station and the channel estimation at the second station,

formatting a frame at the second station in accordance with the reverse link parameters assessment at the second station and the data to be transmitted at the second station and the forward link parameters, and

processing the forward link parameters and the formatted frame at the second station in accordance with the forward link parameters to provide waveforms for transmission to the first station.

7. A method of communicating between first and second stations, including the steps of:

providing at the first station a first preamble including first forward link parameters and first reverse link parameters, both individual to the first station, and providing first data after the first preamble,

transmitting the first preamble and the data from the first station to the second station,

receiving the first preamble and the first data at the second station,

recovering the first data at the second station in accordance with the first forward link parameters from the first station,

providing at the second station a second preamble including second forward link parameters in accordance with the first reverse link parameters received at the second station and including second reverse link parameters individual to the second station and providing second data after the second preamble, and

transmitting the second preamble and the second data from the second station to the first station.

8. A method as set forth in claim 7, including the steps of:

receiving at the first station the second preamble and the second data from the second station and recovering the received data in accordance with the second forward link parameters in the second preamble,

providing at the first station a third preamble including third forward link parameters in accordance with the second reverse link parameters received at the first station and including third reverse link parameters individual to the first station and providing third data after the third preamble, and

transmitting the third preamble and the third data from the first station to the second station.

9. A method as set forth in claim 8, including the steps of:

receiving the third preamble and the third data at the second station,

recovering the third data at the second station in accordance with the third forward link parameters received in the third preamble at the second station,

providing at the second station a fourth preamble including fourth forward link parameters in accordance with the third reverse link parameters received at the second station and including fourth reverse link parameters individual to the second station and providing fourth data after the fourth r preamble, and

transmitting the fourth preamble and the fourth data from the second station to the first station.

10. A method as set forth in claim 9, including the steps of:

receiving the fourth preamble and the fourth data at the first station, and

recovering the fourth data at the first station in accordance with the fourth forward link parameters received in the fourth preamble at the first station.

11. A method as set forth in claim 7, including the steps of:

providing a higher layer network at the second station with a higher priority than the reverse link parameters from the first station, and

providing for the adoption of the higher layer network as the second forward link parameters at the second station.

12. A method as set forth in claim 8, including the steps of:

providing a channel estimation from the first preamble and the first data received at the second station,

providing an assessment of the channel estimation and the received data at the second station to determine the second reverse link parameters individual to the second station.

13. A method as set forth in claim 8,

receiving at the first station the second preamble and the second data from the second station and recovering the received data in accordance with the second forward link parameters in the second preamble,

providing at the first station a third preamble including third forward link parameters in accordance with the second reverse link parameters received at the first station and including third reverse link parameters individual to the first station and providing third data after the third preamble,

transmitting the third preamble and the third data from the first station to the second station,

providing a channel estimation from the first preamble and the first data received at the second station, and

providing an assessment of the channel estimation and the received data at the second station to determine the second reverse link parameters individual to the second station.

14. In a method of communicating between first and second stations, the steps of:

providing at the first station a first preamble including first forward link parameters and first reverse link parameters,

providing first data after the first preamble, and

transmitting signals representing the first preamble and the first data in a packet to the second station, and

providing at the second station a second preamble including second forward link parameters and second reverse link parameters, the second forward link parameters corresponding to the first reverse link parameters.

15. In a method as set forth in claim 14 wherein a training sequence is included in the first preamble.

16. In a method as set forth in claim 14 wherein

the first forward link parameters include information relating to at least one of modulation type, code rate of a forward error correction and spreading factor of the signals in the packet.

17. In a method as set forth in claim 14 wherein

the first reverse link parameters include information relating to at least one of modulation type, code rate of a forward error rate correction and spreading factor of signals in a preamble in a packet to be transmitted from the second station to the first station.

18. In a method as set forth in claim 14 wherein

the first preamble includes a training sequence and the training sequence includes sequences for at least one of sequence synchronization, channel estimation and delay profile.

19. In a method as set forth in claim 14 wherein

the first forward link parameters include information relating to at least one of modulation type, code rate of a forward error correction and spreading factor of the signals in the packet and wherein

the first reverse link parameters include information relating to at least one of modulation type, code rate of a forward error rate correction and spreading factor of signals in a preamble in a packet to be transmitted from the second station to the first station and wherein

the first preamble includes a training sequence and the training sequence includes a sequence of at least one of synchronization, channel estimation and delay profile.

20. A method of communicating between a first station and a second station, including the steps of:

providing for each station, in communicating with the other station, a preamble including forward link parameters and reverse link parameters,

providing data for each station to be transmitted to the other station,

providing for each station packets each including a preamble to be transmitted from the station to the other station and each including data to be transmitted after the preamble, each preamble including forward link parameters and reverse link parameters,

the forward link parameters for the preamble in each station being provided in accordance with the reverse link parameters previously transmitted to the station in a packet from the other station, and

the reverse link parameters for each preamble in each individual station providing an indication to the other station of the forward link parameters to be provided by the other station in the next transmission of a packet from the other station to the individual station.

21. A method as set forth in claim 20 wherein

each preamble to be transmitted from each of the first and second stations to the other of the first or second stations includes a training sequences.

22. A method as set forth in claim 21 wherein

each training sequence includes at least one of synchronization, channel estimation and delay profile.

23. In combination,

a first station constructed to provide a preamble including forward link parameters and reverse link parameters and including data after the preamble,

a second station displaced from the first station and constructed to provide a preamble including forward link parameters and reverse link parameters and including data after the preamble,

the first station being constructed to transmit its preamble and data to the second station for processing by the other one of the stations,

the first station being constructed to provide as its forward link parameters the reverse link parameters, received from the second station.

24. In a combination as set forth in claim 23,

the first station including in the preamble a training sequence for coordinating its station with the operation of the second station.

25. In a combination as set forth in claim 23,

the first station including, in the forward link parameters transmitted to the second station, signals for facilitating the recovery of the data transmitted by the other station and for facilitating the processing of the recovered data.

26. In a combination as set forth in claim 23,

a higher layer network in the first station,

a higher layer network in the second station,

the higher layer network in the first station being used instead of the reverse link parameters in the second station in providing the forward link parameters for the first station.

27. In a combination as set forth in claim 23,

the forward link parameters for each individual station including at least one type of modulation, code rate of forward error corrections and spreading factor of progressive frequencies used in transmitting successive packets of signals from the individual link station to the other station.

28. In a combination as set forth in claim 24,

each of the stations including, in the forward link parameters transmitted to the other station, signals for facilitating the recovery of the data transmitted by the other station and for facilitating the processing of the recovered data,

a higher layer network in the first station,

a higher layer network in the second station,

the higher layer network in the first station being used instead of the reverse link parameters in the second station in providing the forward link parameters for the first station, and

the forward link parameters for each station including types of at least one of modulation, code rate of forward error corrections and spreading factor of progressive frequencies used in transmitting successive packets of signals between the stations.

29. In combination in a first station for receiving data from, and transmitting data to, a second station,

a receiver in the first station for receiving from the second station signals including a preamble and data after the preamble, the preamble including forward link parameters and reverse link parameters,

a preamble detector in the receiver in the first station for detecting the forward link parameters and the reverse link parameters,

a first processor responsive in the receiver in the first station to the forward link parameters for processing the data in accordance with the forward link parameters, and

a transmitter in the first station,

a link adaptation controller in the transmitter in the first station for providing forward link parameters in accordance with the reverse link parameters received by the receiver in the first station from the second station, and

a second processor in the first station for processing data at the transmitter in the first station in accordance with the forward link parameters provided by the link adaptation controller to obtain signals for transmission to the second station.

30. In a combination as set forth in claim 29,

an assessor for providing reverse link parameters individual to the first station, and

a frame formatter for formatting a preamble including the forward link parameters and the reverse link parameters in a preamble and for formatting the preamble and the data in packets.

31. In a combination as set forth in claim 29,

a network responsive to higher sources than the reverse link parameters for superseding the reverse link parameters in providing the forward link parameters for the transmitter in the first station.

32. In a combination as set forth in claim 30,

a channel estimator for estimating parameters to be provided in facilitating the recovery of the signals transmitted by the second station to the first station, and

the assessor being responsive to the data received from the second station and to the parameters estimated by the channel estimator for providing the reverse link parameters to the frame formatter.

33. In a combination as set forth in claim 30,

a network responsive to higher sources than the reverse link parameters for superseding the reverse link parameters in providing the forward link parameters for the transmitter,

a channel estimator for estimating parameters to be provided in facilitating the recovery at the second station of the signals transmitted by the first station to the second station, and

the assessor being responsive to the data received from the second station and to the parameters estimated by the channel estimator for providing the reverse link parameters to the frame formatter.

34. In combination in a first station for transmitting first data to a second station and for receiving second data from the second station,

a controller for providing forward link parameters having characteristics for facilitating the recovery by the second station of data transmitted by the first station to the second station,

an assessor for providing reverse link parameters individual to the first station in facilitating the recovery by the second station of data from the first station and in facilitating the processing of the recovered data by the second station,

a formatter responsive to the forward link parameters, the reverse link parameters and the data to be transmitted to the second station from the first station for formatting the forward link parameters, the reverse link parameters and the data into packets, and

a processor at the first station for processing the data in the packets in accordance with the forward link parameters to provide signals for transmission to the second station.

35. In a combination as set forth in claim 34,

an estimator for estimating parameters for facilitating the recovery at the second station of the signals received at the second station from the first station,

the assessor being responsive to the parameters estimated by the estimator for providing the reverse link parameters.