Method for wifi beamforming, feedback, and sounding (WIBEAM)

A beamforming, feedback frame technology, applied in the field of WIFI beamforming, feedback and sounding (WIBEAM), can solve problems such as reducing spectral efficiency and BSS capacity

Active Publication Date: 2015-06-24
INTERDIGITAL PATENT HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current beamforming reporting method results in significant feedback overhead, thereby reducing spectral efficiency and BSS capacity

Method used

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  • Method for wifi beamforming, feedback, and sounding (WIBEAM)
  • Method for wifi beamforming, feedback, and sounding (WIBEAM)
  • Method for wifi beamforming, feedback, and sounding (WIBEAM)

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Embodiment

[0328] CLAIMS 1. A method in a Wireless Transmit / Receive Unit (WTRU), the method comprising: signaling feedback.

[0329] 2. According to the method described in embodiment 1, the method also includes:

[0330] Select or shape beams.

[0331] 3. The method as in any one of the preceding embodiments, wherein the shaped beam is based on the signaled feedback.

[0332] 4. The method according to any one of the preceding embodiments, the method further comprising:

[0333] receiving a codebook-based sounding frame;

[0334] estimating a channel based on the received codebook-based sounding frames; and

[0335] Feedback codeword index.

[0336] 5. The method as in any one of the preceding embodiments, wherein the codebook-based sounding frame is received after a beacon frame.

[0337] 6. The method as in any preceding embodiment, wherein the codebook-based sounding frame is received after the codebook-based sounding frame request.

[0338] 7. The method as in any one of the p...

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Abstract

Methods for WiFi beamforming, feedback, and sounding (WiBEAM) are described. Codebook based beamforming feedback signaling and sounding mechanisms for use in wireless communications are disclosed. The methods described herein improve the feedback efficiency by using Givens rotation based decompositions and quantizing the resulting angles of the Givens rotation based decompositions using a range from a subset of [0, 2π]. Feedback may also be divided into multiple components to improve feedback efficiency/accuracy. Time domain beamforming reports for taking advantage of channel reciprocity while still taking into account practical radio frequency (RF) channel impairments are also described. Beamforming feedback that prioritizes the feedback bits in accordance with the significance of the bits is also disclosed. A preamble structure to enable the use of smoothing methods for improved channel estimation, codebook designs that may be used for codebook based beamforming feedback, and multi-resolution explicit feedback are disclosed as well.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Patent Application No. 61 / 707,452, filed September 28, 2012, U.S. Provisional Patent Application No. 61 / 770,879, filed February 28, 2013, and March 14, 2013 The benefit of filed U.S. Provisional Patent Application No. 61 / 783,918, the contents of which are hereby incorporated by reference. Background technique [0003] Current wireless local area network (WLAN) systems, such as IEEE 802.11n, IEEE 802.11ac and IEEE 802.11ad support multiple transmit antennas at both the transmitter (Tx) and receiver (Rx). Multiple transmit and receive antennas are supported in access points (APs), wireless transmit / receive units (WTRUs), and other non-WTRU devices. For example, 802.11n supports up to 4 transmit and 4 receive antennas, while 802.11ac supports up to 8 transmit and 8 receive antennas. For such systems, transmit beamforming (also referred to as "precoding") may be used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/06H04L1/00
CPCH04B7/0421H04B7/0617H04B7/0628H04B7/0634H04B7/0639H04B7/0641H04B7/066H04L1/007H04L1/0073H04B1/40H04B3/23
Inventor P·夏M·高希H·娄R·L·奥勒森O·奥特莱
Owner INTERDIGITAL PATENT HLDG INC
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