Phase rotation for preambles within multiple user, multiple access, and/or MIMO wireless communications

Patent metadata

Field	Value
Publication number	US-2016173305-A1
Application number	US-201615052337-A
Country	US
Kind code	A1
Filing date	Feb 24, 2016
Priority date	Aug 31, 2010
Publication date	Jun 16, 2016
Grant date	—

Abstract

Phase rotation for preambles within multiple user, multiple access, and/or MIMO wireless communications. An appropriately designed phase rotation vector and/or appropriately designed cyclic shift delays (CSDs) are applied to respective sub-band components of the preamble. With appropriately designed CSDs, certain fields within the preamble are not modified. For example, a legacy short training field (L-STF) of the preamble is not changed when using appropriately designed CSDs. The respective CSDs may be implemented as integer multiples of a common CSD (e.g., 0×CSD, 1×CSD, 2×CSD, etc. such that one of the values of such a CSD vector may be zero [0], another may be the common CSD itself, etc.). Also, by employing an appropriately designed phase rotation vector and integer multiples of a CSD to a preamble, the respective peak to average power ratio (PAPR) between different respective fields within the preamble may be minimized.

First claim

What is claimed is:

1 . A wireless communication device comprising:
a processor configured to:
receive, from another wireless communication device, a first sub-band component of a signal via a first sub-band of a communication channel, wherein the signal includes a plurality of sub-components including the first sub-band component and a second one or more sub-band components, wherein the second one or more sub-band components have undergone rotation based on a phase rotation vector, and wherein the first sub-band component and the second one or more sub-band components of the signal have undergone cyclic shift delay (CSD);
receive a second sub-band component of the signal via a second sub-band of the communication channel; and
process the first sub-band component and the second one or more sub-band components of the signal based on the CSD and the phase rotation vector to recover data transmitted from the another wireless communication device.

2 . The wireless communication device of claim 1 , wherein the processor is further configured to:
receive a third sub-band component of the signal via a third sub-band of the communication channel; receive a fourth sub-band component of the signal via a fourth sub-band of the communication channel; and process the first sub-band component, the second sub-band component, the third sub-band component, and the fourth sub-band component based on the CSD and the phase rotation vector to recover the data transmitted from the another wireless communication device.

3 . The wireless communication device of claim 2 , wherein the phase rotation vector is [1, −1, −1, −1].

4 . The wireless communication device of claim 2 , wherein:
the first sub-band of the communication channel is a first 20 MHz sub-band of an 80 MHz communication channel; the second sub-band of the communication channel is a second 20 MHz sub-band of the 80 MHz communication channel; the third sub-band of the communication channel is a third 20 MHz sub-band of the 80 MHz communication channel; and the fourth sub-band of the communication channel is a fourth 20 MHz sub-band of the 80 MHz communication channel.

5 . The wireless communication device of claim 1 , wherein:
the first sub-band of the communication channel is a first 20 MHz sub-band of the communication channel; and the second sub-band of the communication channel is a second 20 MHz sub-band of the communication channel.

6 . The wireless communication device of claim 1 further comprising:
a communication interface, coupled to the processor, that is configured to support communications within at least one of a satellite communication system, a wireless communication system, a wired communication system, a fiber-optic communication system, or a mobile communication system; and
the processor configured to receive the signal from the another wireless communication device via the communication interface.

7 . The wireless communication device of claim 1 further comprising:
a wireless station (STA), wherein the another wireless communication device includes an access point (AP).

8 . The wireless communication device of claim 1 further comprising:
an access point (AP), wherein the another wireless communication device includes a wireless station (STA).

9 . A wireless communication device comprising:
a processor configured to:
receive, from another wireless communication device, a first sub-band component of a signal via a first sub-band of a communication channel, wherein the signal includes a plurality of sub-components including the first sub-band component and a second one or more sub-band components, wherein the second one or more sub-band components have undergone rotation based on a phase rotation vector that is [1, −1, −1, −1], and wherein the first sub-band component and the second one or more sub-band components of the signal have undergone cyclic shift delay (CSD);
receive a second sub-band component of the signal via a second sub-band of the communication channel;
receive a third sub-band component of the signal via a third sub-band of the communication channel;
receive a fourth sub-band component of the signal via a fourth sub-band of the communication channel; and
process the first sub-band component, the second sub-band component, the third sub-band component, and the fourth sub-band component of the signal based on the CSD and the phase rotation vector to recover data transmitted from the another wireless communication device.

10 . The wireless communication device of claim 9 , wherein:
the first sub-band of the communication channel is a first 20 MHz sub-band of an 80 MHz communication channel; the second sub-band of the communication channel is a second 20 MHz sub-band of the 80 MHz communication channel; the third sub-band of the communication channel is a third 20 MHz sub-band of the 80 MHz communication channel; and the fourth sub-band of the communication channel is a fourth 20 MHz sub-band of the 80 MHz communication channel.

11 . The wireless communication device of claim 9 further comprising:
a communication interface, coupled to the processor, that is configured to support communications within at least one of a satellite communication system, a wireless communication system, a wired communication system, a fiber-optic communication system, or a mobile communication system; and
the processor configured to receive the signal from the another wireless communication device via the communication interface.

12 . The wireless communication device of claim 9 further comprising:
a wireless station (STA), wherein the another wireless communication device includes an access point (AP).

13 . The wireless communication device of claim 9 further comprising:
an access point (AP), wherein the another wireless communication device includes a wireless station (STA).

14 . A method for execution by a wireless communication device, the method comprising:
receiving, via a communication interface of the wireless communication device and from another wireless communication device, a first sub-band component of a signal via a first sub-band of a communication channel, wherein the signal includes a plurality of sub-components including the first sub-band component and a second one or more sub-band components, wherein the second one or more sub-band components have undergone rotation based on a phase rotation vector, and wherein the first sub-band component and the second one or more sub-band components of the signal have undergone cyclic shift delay (CSD); receiving, via the communication interface of the wireless communication device and from the another wireless communication device, a second sub-band component of the signal via a second sub-band of the communication channel; and processing the first sub-band component and the second one or more sub-band components of the signal based on the CSD and the phase rotation vector to recover data transmitted from the another wireless communication device.

15 . The method of claim 14 further comprising:
receiving, via the communication interface of the wireless communication device and from the another wireless communication device, a third sub-band component of the signal via a third sub-band of the communication channel;
receiving, via the communication interface of the wireless communication device and from the another wireless communication device, a fourth sub-band component of the signal via a fourth sub-band of the communication channel; and
processing the first sub-band component, the second sub-band component, the third sub-

Assignees

• Broadcom Corp

Inventors

• Zheng Jun
• Hoo Min Chuin
• Erceg Vinko

Classifications

• H04L27/227 Primary

  using coherent demodulation · CPC title

• H04B7/084

  Equal gain combining, only phase adjustments (antenna beam scanning or forming by phase or amplitude control H01Q3/26, e.g. phased arrays) · CPC title

• H04L27/2613 Primary

  Structure of the reference signals · CPC title

• H04L25/03866

  using scrambling · CPC title

• H04L5/0048

  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