Carrier frequency offset estimation

Patent metadata

Field	Value
Publication number	US-10243711-B1
Application number	US-201615334550-A
Country	US
Kind code	B1
Filing date	Oct 26, 2016
Priority date	Mar 24, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A first communication device receives, from a second communication device, a synchronization frame having an allocation indicator that indicates a non-overlapping allocation of pilot tones. The first communication device generates a first data frame that comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols of a non-legacy training field portion, the plurality of OFDM symbols including only pilot tones corresponding to the non-overlapping allocation of pilot tones. The first communication device transmits, in response to the synchronization frame and via a multiple input, multiple output (MIMO) communication channel, the first data frame to the second communication device simultaneously with a transmission of a second data frame by a third communication device via the MIMO communication channel, wherein corresponding OFDM symbols of respective non-legacy training field portions of the first data frame and the second data frame include non-overlapping pilot tones according to the non-overlapping allocation.

First claim

What is claimed is:

1. A method for transmitting a transmission data unit in a communication network, the method comprising:
receiving, at a first communication device and from a second communication device, a synchronization frame having an allocation indicator that indicates a non-overlapping allocation of pilot tones;
generating, by the first communication device, a first transmission data unit that comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols of a non-legacy training field portion and a further plurality of OFDM symbols of a data portion, the plurality of OFDM symbols including only pilot tones corresponding to the non-overlapping allocation of pilot tones, the further plurality of OFDM symbols including only pilot tones corresponding to the non-overlapping allocation of pilot tones; and
transmitting, by the first communication device in response to the synchronization frame and via a multiple input, multiple output (MIMO) communication channel, the first transmission data unit to the second communication device simultaneously with a transmission of a second transmission data unit by a third communication device via the MIMO communication channel, wherein corresponding OFDM symbols of respective non-legacy training field portions and respective data portions of the first transmission data unit and the second transmission data unit include non-overlapping pilot tones according to the non-overlapping allocation, wherein the first transmission data unit and the second transmission data unit occupy a same bandwidth of the MIMO communication channel.

2. The method of claim 1 , wherein transmitting the first transmission data unit comprises:
transmitting the OFDM symbols of the non-legacy training field portion of the first transmission data unit at a first transmit power; and
transmitting the OFDM symbols of the data portion of the first transmission data unit at a second transmit power that is less than the first transmit power.

3. The method of claim 1 , wherein the allocation indicator corresponds to a non-overlapping block allocation of pilot tones.

4. The method of claim 1 , wherein the allocation indicator corresponds to a non-overlapping interleaved allocation of pilot tones.

5. An apparatus, comprising:
a network interface associated with a first communication device, the network interface comprising one or more integrated circuit devices configured to:
receive, from a second communication device, a synchronization frame having an allocation indicator that indicates a non-overlapping allocation of pilot tones;
generate a first transmission data unit that comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols of a non-legacy training field portion and a further plurality of OFDM symbols of a data portion, the plurality of OFDM symbols including only pilot tones corresponding to the non-overlapping allocation of pilot tones, the further plurality of OFDM symbols including only pilot tones corresponding to the non-overlapping allocation, of pilot tones; and
cause the first communication device to transmit, in response to the synchronization frame and via a multiple input, multiple output (MIMO) communication channel, the first transmission data unit fame to the second communication device simultaneously with a transmission of a second transmission data unit by a third communication device via the MIMO communication channel, wherein corresponding OFDM symbols of respective non-legacy training field portions of the first transmission data unit and the second transmission data unit include non-overlapping pilot tones according to the non-overlapping allocation, wherein the first transmission data unit and the second transmission data unit occupy a same bandwidth of the MIMO communication channel.

6. The apparatus of claim 5 , wherein the one or more integrated circuit devices are further configured to:
cause the first communication device to transmit the OFDM symbols of the non-legacy training field portion of the first transmission data unit at a first transmit power; and
cause the first communication device to transmit the OFDM symbols of the data portion of the first transmission data unit at a second transmit power that is less than the first transmit power.

7. The apparatus of claim 5 , wherein the allocation indicator corresponds to a non-overlapping block allocation of pilot tones.

8. The apparatus of claim 5 , wherein the allocation indicator corresponds to a non-overlapping interleaved allocation of pilot tones.

9. A method for transmitting a transmission data unit in a communication network, the method comprising:
receiving, at a first communication device and from a second communication device, a synchronization frame having an allocation indicator that indicates a non-overlapping allocation of pilot tones;
generating, by the first communication device, a first transmission data unit that comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols of a data portion, the plurality of OFDM symbols including only pilot tones corresponding to the non-overlapping allocation of pilot tones; and
transmitting, by the first communication device in response to the synchronization frame and via a multiple input, multiple output (MIMO) communication channel, the first transmission data unit to the second communication device simultaneously with a transmission of a second transmission data unit by a third communication device via the MIMO communication channel, wherein corresponding OFDM symbols of respective data portions of the first transmission data unit and the second transmission data unit include non-overlapping pilot tones according to the non-overlapping allocation, wherein the first transmission data unit and the second transmission data unit occupy a same bandwidth of the MIMO communication channel.

10. The method of claim 9 , wherein:
generating the first transmission data unit that comprises generating a plurality of OFDM symbols of a portion of a physical layer (PHY) protocol preamble; and
transmitting the first transmission data unit comprises:
transmitting OFDM symbols of the portion of the PHY preamble of the first transmission data unit at a first transmit power; and
transmitting OFDM symbols of the data portion of the first transmission data unit at a second transmit power that is less than the first transmit power.

11. The method of claim 10 , wherein generating the plurality of OFDM symbols of the portion of the PHY protocol preamble comprises:
generating the plurality of OFDM symbols of the portion of the PHY protocol preamble to include pilot tones that only correspond to the non-overlapping allocation of pilot tones.

12. The method of claim 9 , wherein:
the allocation indicator corresponds to a non-overlapping block allocation of pilot tones; and
generating the first transmission data unit comprises:
generating the plurality of OFDM symbols of the data portion using the non-overlapping block allocation of pilot tones.

13. The method of claim 9 , wherein:
the allocation indicator corresponds to a non-overlapping interleaved allocation of pilot tones; and
generating the first transmission data unit comprises:
generating the plurality of OFDM symbols of the data portion using the non-overlapping block allocation of pilot tones.

14. An apparatus, comprising:
a network interface associated with a first communication device, the network interface comprising one or more integrated circuit devices configured to:
receive, from a second communication device, a synchronization frame having an allocation indi

Assignees

• Marvell Int Ltd

Inventors

• Cao Rui
• Zheng Xiayu
• Zhang Hongyuan
• Lou Hui-Ling
• Chu Liwen
• Sun Yakun

Classifications

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L5/0007

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

• H04B7/0413

  MIMO systems · CPC title

• H04W72/044

  based on the type of the allocated resource · CPC title

• H04W56/0035

  detecting errors in frequency or phase · CPC title