Originator and recipient based transmissions in wireless communications

Patent metadata

Field	Value
Publication number	US-9515788-B2
Application number	US-201514961445-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Jun 13, 2000
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

Methods and systems are described for determining a plurality of transmission levels for, e.g., a plurality of time-frequency channels and/or a plurality of tones. The transmission levels may be determined by a first node based on, for example, a received transmission from a second node. The first node may generate a signal, which may be based on, for example, an originator-based pseudorandom sequence, a recipient-based pseudorandom sequence, and/or a complex sinusoid. The first node may transmit the signal as an orthogonal frequency division multiplexing (OFDM) transmission.

First claim

The invention claimed is:

1. A method comprising:
receiving, by a first node, a first transmission from a second node;
determining, based at least in part on the first transmission, a plurality of transmission levels, respectively, for a plurality of time-frequency channels;
generating a signal that comprises an originator-based first pseudorandom sequence; and
transmitting the signal, via the plurality of time-frequency channels and using the plurality of transmission levels, as at least part of an orthogonal frequency division multiplexing (OFDM) second transmission via one or more antennas of a plurality of antennas of the first node.

2. The method of claim 1 , wherein the signal comprises the originator-based first pseudorandom sequence modified by an originating node index overlay and a recipient-based second pseudorandom sequence.

3. The method of claim 1 , wherein the generating the signal comprises generating the signal to further comprise user data and a recipient-based second pseudorandom sequence.

4. The method of claim 1 , wherein a first portion of the OFDM second transmission comprises a first portion of the signal modified by user data associated with the second node, and wherein a second portion of the OFDM second transmission comprises a second portion of the signal that is not modified by the user data.

5. The method of claim 1 , wherein the generating the signal comprises generating the signal to further comprise a complex sinusoid that identifies an originator of the OFDM second transmission.

6. The method of claim 1 , wherein the generating the signal comprises generating the signal to comprise:
the originator-based first pseudorandom sequence, wherein the originator-based first pseudorandom sequence identifies an originating group, associated with the OFDM second transmission, that comprises the first node;
a second pseudorandom sequence that identifies a recipient of the OFDM second transmission; and
a complex sinusoid that identifies an originator of the OFDM second transmission.

7. The method of claim 1 , wherein the signal comprises a pilot signal.

8. The method of claim 1 , wherein the transmitting comprises transmitting the OFDM second transmission to multiple recipients using a multiple access scheme.

9. The method of claim 1 , wherein the OFDM second transmission comprises a time series of OFDM symbols, the method further comprising inserting the signal into a first plurality of the time series of OFDM symbols and user data into a second plurality of the time series of OFDM symbols.

10. The method of claim 1 , wherein the generating the signal comprises generating the signal to further comprise a complex signal component that identifies an originator of the OFDM second transmission.

11. The method of claim 1 , wherein the generating the signal comprises generating the signal to comprise:
the originator-based first pseudorandom sequence, wherein the originator-based first pseudorandom sequence identifies an originating group, associated with the OFDM second transmission, that comprises the first node;
a second pseudorandom sequence that identifies a recipient of the OFDM second transmission; and
a complex signal component that identifies an originator of the OFDM second transmission.

12. A first node comprising:
a plurality of antennas; and
circuitry configured to:
receive a first transmission from a second node;
determine, based at least in part on the first transmission, a plurality of transmission levels, respectively, for a plurality of tones;
generate a signal that comprises an originator-based first pseudorandom sequence modified by an originating node index overlay and a recipient-based second pseudorandom sequence; and
cause transmission of the signal, using the plurality of tones and the plurality of transmission levels, as at least part of an orthogonal frequency division multiplexing (OFDM) second transmission via one or more antennas of the plurality of antennas.

13. The first node of claim 12 , wherein a first portion of the OFDM second transmission comprises a first portion of the signal modified by user data associated with the second node, and wherein a second portion of the OFDM second transmission comprises a second portion of the signal that is not modified by the user data.

14. The first node of claim 12 , wherein the originator-based first pseudorandom sequence identifies an originating group, associated with the OFDM second transmission, that comprises the first node.

15. The first node of claim 12 , wherein the signal comprises a pilot signal.

16. The first node of claim 12 , wherein the circuitry is configured to cause the signal to be transmitted as at least part of the OFDM second transmission to multiple recipients using a multiple access scheme.

17. The first node of claim 12 , wherein the OFDM second transmission comprises a time series of OFDM symbols, and wherein the circuitry is further configured to insert the signal into a first plurality of the time series of OFDM symbols and user data into a second plurality of the time series of OFDM symbols.

18. A method comprising:
receiving, by a first node, a first transmission from a second node;
determining, based at least in part on the first transmission, a plurality of transmission levels, respectively, for a plurality of tones;
generating a signal that comprises an originator-based first pseudorandom sequence and that comprises a complex sinusoid that identifies an originator of an orthogonal frequency division multiplexing (OFDM) second transmission; and
transmitting the signal, using the plurality of tones and the plurality of transmission levels, as at least part of the OFDM second transmission via one or more antennas of a plurality of antennas of the first node.

19. The method of claim 18 , wherein the generating the signal comprises generating the signal to further comprise user data.

20. The method of claim 18 , wherein a first portion of the OFDM second transmission comprises a first portion of the signal modified by user data associated with the second node, and wherein a second portion of the OFDM second transmission comprises a second portion of the signal that is not modified by the user data.

21. The method of claim 18 , wherein the generating the signal comprises generating the signal to further comprise user data and a recipient-based second pseudorandom sequence.

22. The method of claim 18 , wherein a first portion of the OFDM second transmission comprises a first portion of the signal modified by user data associated with the second node, and wherein a second portion of the OFDM second transmission comprises a second portion of the signal that is not modified by the user data.

23. The method of claim 18 , wherein the generating the signal comprises generating the signal to comprise:
the originator-based first pseudorandom sequence, wherein the originator-based first pseudorandom sequence identifies an originating group, associated with the OFDM second transmission, that comprises the first node;
a second pseudorandom sequence that identifies a recipient of the OFDM second transmission; and
the complex sinusoid that identifies the originator of the OFDM second transmission.

24. The method of claim 18 , wherein the OFDM second transmission comprises a time series of OFDM symbols, the method further comprising inserting the signal into a first plurality of the time series of OFDM symbols a

Assignees

• Comcast Cable Comm Llc

Inventors

• Agee Brian G
• Bromberg Matthew C

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/542

  using measured or perceived quality · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04L5/0007 Primary

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L27/2607

  Cyclic extensions · CPC title