Transmission of OFDM symbols

• US 10,257,765 B2
• Filed: 11/13/2017
• Issued: 04/09/2019
• Est. Priority Date: 06/13/2000
• Status: Expired due to Term

• Current Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Original Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Inventors: Agee, Brian G., Bromberg, Matthew C.
• Primary Examiner(s): Odom, Curtis
• Application Number:
  US15/811,087
• Publication Number:
  US 20180192349A1
• Time in Patent Office: 512 Days
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0443 utilizing "waterfilling" technique
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0465 taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 40/04 based on wireless node resources
• CPC Class Codes: H04W 52/241 : taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/265 : taking into account the quality of service QoS
• CPC Class Codes: H04W 52/42 : in systems with time, space, frequency or polarisation diversity
• CPC Class Codes: H04W 72/00 : Local resource management
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/044 : based on the type of the allocated resource
• CPC Class Codes: H04W 72/0453 : Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/542 : using measured or perceived quality
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Methods and systems are described in which a node may cause a plurality of orthogonal frequency division multiplexing (OFDM) symbols to be transmitted. The OFDM symbols may comprise at least a portion of a pilot and/or user data.

Claims

1. A system comprising:

a first node comprising;

a plurality of antennas; and

first circuitry configured to cause, via at least one of the plurality of antennas and based on a request for user data associated with a second node, wireless orthogonal frequency division multiplexing (OFDM) transmission of;

a first OFDM symbol comprising a first portion of a pilot; and

a second OFDM symbol comprising at least a portion of the user data and a second portion of the pilot,

wherein the pilot comprises at least one pseudorandom sequence, and the pilot is associated with the second node and with a group of nodes that comprises the first node; and

the second node comprising;

one or more antennas; and

second circuitry configured to decode the pilot and the at least the portion of the user data based at least in part on the first OFDM symbol and the second OFDM symbol.

2. The system of claim 1, wherein the at least one pseudorandom sequence is associated with the first node.

3. The system of claim 1, wherein the at least one pseudorandom sequence is associated with the group of nodes that comprises the first node.

4. The system of claim 1, wherein the at least one pseudorandom sequence is associated with the second node.

5. The system of claim 1, wherein the first node comprises a base station and the second node comprises a mobile terminal.

6. The system of claim 1, wherein the first circuitry is further configured to cause wireless OFDM transmission of additional OFDM symbols comprising portions of the pilot that vary amongst the additional OFDM symbols.

7. The system of claim 1, wherein the first circuitry is further configured to cause wireless OFDM transmission of a third OFDM symbol comprising synchronization information.

8. A first node comprising:

a plurality of antennas; and

circuitry configured to cause, via at least one of the plurality of antennas and based on a request for user data associated with a second node, wireless orthogonal frequency division multiplexing (OFDM) transmission of;

a first OFDM symbol comprising a first portion of a pilot; and

a second OFDM symbol comprising at least a portion of the user data and a second portion of the pilot,

wherein the pilot comprises at least one pseudorandom sequence, and the pilot is associated with the second node and with a group of nodes that comprises the first node.

9. The first node of claim 8, wherein the at least one pseudorandom sequence is associated with the first node.

10. The first node of claim 8, wherein the at least one pseudorandom sequence is associated with the group of nodes that comprises the first node.

11. The first node of claim 8, wherein the at least one pseudorandom sequence is associated with the second node.

12. The first node of claim 8, wherein the first node comprises a base station and the second node comprises a mobile terminal.

13. The first node of claim 8, wherein the circuitry is further configured to cause wireless OFDM transmission of additional OFDM symbols comprising portions of the pilot that vary amongst the additional OFDM symbols.

14. The first node of claim 8, wherein the circuitry is further configured to cause wireless OFDM transmission of a third OFDM symbol comprising synchronization information.

15. A second node comprising:

one or more antennas; and

circuitry configured to;

wirelessly transmit a request for user data;

wirelessly receive, from a first node, an orthogonal frequency division multiplexing (OFDM) transmission of;

a first OFDM symbol comprising a first portion of a pilot; and

a second OFDM symbol comprising at least a portion of the user data and a second portion of the pilot,

wherein the pilot comprises at least one pseudorandom sequence, and the pilot is associated with the second node and with a group of nodes that comprises the first node; and

decode the pilot and the at least the portion of the user data based at least in part on the first OFDM symbol and the second OFDM symbol.

16. The second node of claim 15, wherein the at least one pseudorandom sequence is associated with the first node.

17. The second node of claim 15, wherein the at least one pseudorandom sequence is associated with the group of nodes that comprises the first node.

18. The second node of claim 15, wherein the at least one pseudorandom sequence is associated with the second node.

19. The second node of claim 15, wherein the first node comprises a base station and the second node comprises a mobile terminal.

20. The second node of claim 15, wherein the OFDM transmission comprises a third OFDM symbol that comprises synchronization information, and the circuitry is configured to use the synchronization information to decode the pilot and the at least the portion of the user data.

21. A method comprising:

receiving, by a first node, a request for user data associated with a second node; and

causing, via at least one of a plurality of antennas, wireless orthogonal frequency division multiplexing (OFDM) transmission of;

a first OFDM symbol comprising a first portion of a pilot; and

a second OFDM symbol comprising at least a portion of the user data and a second portion of the pilot,

wherein the pilot comprises at least one pseudorandom sequence, and the pilot is associated with the second node and with a group of nodes that comprises the first node.

22. The method of claim 21, wherein the at least one pseudorandom sequence is associated with the first node.

23. The method of claim 21, wherein the at least one pseudorandom sequence is associated with the group of nodes that comprises the first node.

24. The method of claim 21, wherein the at least one pseudorandom sequence is associated with the second node.

25. The method of claim 21, wherein the first node comprises a base station and the second node comprises a mobile terminal.

26. The method of claim 21, further comprising causing wireless OFDM transmission of additional OFDM symbols comprising portions of the pilot that vary amongst the additional OFDM symbols.

27. The method of claim 21, further comprising causing wireless OFDM transmission of a third OFDM symbol comprising synchronization information.

28. The method of claim 21, further comprising:

decoding, by the second node, the pilot and the at least the portion of the user data based at least in part on the first OFDM symbol and the second OFDM symbol.

29. A method comprising:

wirelessly transmitting, by a second node, a request for user data;

wirelessly receiving, from a first node, an orthogonal frequency division multiplexing (OFDM) transmission of;

a first OFDM symbol comprising a first portion of a pilot; and

a second OFDM symbol comprising at least a portion of the user data and a second portion of the pilot,

wherein the pilot comprises at least one pseudorandom sequence, and the pilot is associated with the second node and with a group of nodes that comprises the first node; and

decoding the pilot and the at least the portion of the user data based at least in part on the first OFDM symbol and the second OFDM symbol.

30. The method of claim 29, wherein the at least one pseudorandom sequence is associated with the first node.

31. The method of claim 29, wherein the at least one pseudorandom sequence is associated with the group of nodes that comprises the first node.

32. The method of claim 29, wherein the at least one pseudorandom sequence is associated with the second node.

33. The method of claim 29, wherein the first node comprises a base station and the second node comprises a mobile terminal.

34. The method of claim 29, wherein the OFDM transmission comprises a third OFDM symbol that comprises synchronization information, and decoding comprises using the synchronization information to decode the pilot and the at least the portion of the user data.