First and second communication devices and methods

Patent metadata

Field	Value
Publication number	US-12476845-B2
Application number	US-202118269571-A
Country	US
Kind code	B2
Filing date	Dec 17, 2021
Priority date	Jan 14, 2021
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A first communication device that is configured to transmit data to a second communication device comprises circuitry configured to generate a second number of mutually orthogonal sequences; generate a third number of one or more spatial streams, each spatial stream carrying pay load data; generate a fourth number of transmission training sequences, each comprising, in addition to a distinct orthogonal sequence of said mutually orthogonal sequences, one or more zeros and/or a subset of said distinct orthogonal sequence; generate a training field by mapping the transmission training sequences into a first number of training symbols, each training symbol spanning a plurality of tones; and arrange the training field before and/or between the payload of the spatial streams to enable channel estimation by the second communication device.

First claim

The invention claimed is:

1 . A first communication device configured to transmit data to a second communication device, the first communication device comprising:
circuitry configured to:
generate a second number of mutually orthogonal sequences;
generate a third number of one or more spatial streams, each spatial stream carrying payload data;
generate a training field by mapping a length of a fourth number of transmission training sequences into a first number of training symbols, each training symbol spanning a plurality of tones, and each transmission training sequence comprising, in addition to a distinct orthogonal sequence of said mutually orthogonal sequences, one or more zeros and/or a subset of said distinct orthogonal sequence; and
arrange the training field before and/or between the payload of the spatial streams to enable channel estimation by the second communication device, wherein
the first number of training symbols equals the length of the fourth number of transmission training sequences, the first number of training symbols is set to be larger than the third number of spatial streams and/or the second number of orthogonal sequences is set to be larger than the third number of spatial streams, and the fourth number of transmission training sequences is set to be larger than or equal to the third number of spatial streams.

2 . The first communication device of claim 1 , wherein
the circuitry is configured to transmit first signaling information indicating one or more of the number of training symbols, the second number of orthogonal sequences, the third number of spatial streams, the fourth number of transmission training sequences, the presence, number and/or position of zeros and/or replicated elements represented by said subset of said distinct orthogonal sequence in the transmission training sequences.

3 . The first communication device of claim 1 , wherein
the circuitry is configured to obtain second signaling information from the second communication device, said second signaling information indicating if the first number of training symbols and/or the second number of orthogonal sequences shall be increased or decreased.

4 . The first communication device of claim 3 , wherein
the circuitry is configured to obtain as second signaling information one or more of a maximum number of training symbols, an interference indicator, an interference margin and a number of training symbols and/or orthogonal sequences to add or remove.

5 . The first communication device of claim 1 , wherein
the circuitry is configured to add one or more zeros at the beginning, at the end and/or in between the non-zero elements of a distinct orthogonal sequence in the transmission training sequences.

6 . The first communication device of claim 5 , wherein
the circuitry is configured to limit the number of consecutively arranged zeros in the transmission training sequences such that the time length of said consecutively arranged zeros is smaller than an interframe space.

7 . The first communication device of claim 1 , wherein
the circuitry is configured to add one or more replicated elements in the transmission training sequences, wherein the tones of the training symbols mapped into replicated elements are shifted in frequency compared to the tones of the corresponding elements of the original orthogonal sequence.

8 . The first communication device of claim 7 , wherein
the circuitry is configured perform the tone shift such that it does not change reserved tone areas and/or periodicity of the original training symbol.

9 . The first communication device of claim 7 , wherein
the circuitry is configured to transmit first signaling information indicating if and which tone shifts are applied to replicated elements of the transmission training sequences.

10 . The first communication device of claim 7 , wherein
the circuitry is configured to obtain second signaling information from the second communication device, said second signaling information indicating to change the tone shift.

11 . The first communication device of claim 1 , wherein
the circuitry is configured to generate the training field by multiplying, element-wise and/or per tone, the transmission training sequences with the training symbols.

12 . The first communication device of claim 1 , wherein
the circuitry is configured to identify a spatial stream by a distinct orthogonal sequence, wherein the training field contains a third number of distinct sets of training symbols that have been mapped with distinct orthogonal sequences, and to map the corresponding sets of training symbols and payload data of each spatial stream directly or indirectly onto transmit antennas using multiple input multiple output (MIMO) techniques.

13 . A second communication device configured to receive data from a first communication device, the second communication device comprising:
circuitry configured to:
obtain one or more intended channel observations of one or more channels between the first communication device and the second communication device based on at least a part of a training field comprising a first number of training symbols, the training field being arranged before and/or between the payload of a third number of one or more spatial streams received from the first communication device, wherein each spatial stream carries payload data, each training symbol spans a plurality of tones, and a second number of mutually orthogonal sequences is comprised in a fourth number of transmission training sequences mapped into the first number of training symbols of the training field;
perform interference channel estimation of one or more potential interference channels based on another part of said training field; and
perform interference suppression based on interference channel estimation information resulting from the interference channel estimation, wherein
the first number of training symbols equals the length of a transmission training sequence, the first number of training symbols is larger than the third number of spatial streams and/or the second number of orthogonal sequences is larger than the third number of spatial streams, and the fourth number of transmission training sequences is set to be larger than or equal to the third number of spatial streams.

14 . The second communication device of claim 13 , wherein the circuitry is configured to
obtain the intended channel observations from a part of the training field by extracting them from the orthogonal sequences mapped into the training symbols and to perform intended channel estimation of the one or more channels based on the obtained intended channel observations to refine the interference channel estimate, and/or obtain the interference channel observations based on another part of said training field and to perform interference channel estimation of the one or more potential interference channels based on the obtained interference channel observations.

15 . The second communication device of claim 13 , wherein
the circuitry is configured to obtain the interference channel observations from another part of the training field by extracting them from one or more zeros and/or a subset of a distinct orthogonal sequence comprised in a transmission training sequence.

16 . The second communication device of claim 13 , wherein
the circuitry is configured to receive first signaling information from the first communication device, the first signaling information indicating one or more of the first number of training symbols, the se

Assignees

• Sony Group Corp

Inventors

• Verenzuela Daniel
• Handte Thomas
• Ciochina-Kar Dana

Classifications

• H04L25/0226 Primary

  sounding signals per se · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04L5/0062

  Avoidance of ingress interference, e.g. ham radio channels · CPC title

• H04L25/0204 Primary

  of multiple channels · 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