First and second communication devices and methods

Patent metadata

Field	Value
Publication number	US-2025141625-A1
Application number	US-202218691471-A
Country	US
Kind code	A1
Filing date	Sep 19, 2022
Priority date	Sep 20, 2021
Publication date	May 1, 2025
Grant date	—

Abstract

A first communication device that is configured to transmit data to a second communication device comprises circuitry configured to generate a number of one or more spatial streams, each spatial stream carrying payload data; map the payload data of each of the one or more spatial streams into a data field of a data unit, wherein a data unit comprises a preamble and a data field carrying one or more OFDM symbols and wherein one or more resource units (RU) are allocated to a data unit; reserve one or more subcarriers within one or more embedded training sequences (ETS) RU blocks (ERUBs) in one or more OFDM symbols in the data field of a data unit, wherein an ERUB spans part of or the complete bandwidth of a RU; and embed one or more ETSs into the one or more reserved subcarriers within one or more ERUBs.

First claim

1 . First communication device configured to transmit data to a second communication device, the first communication device comprising circuitry configured to:
generate a number of one or more spatial streams, each spatial stream carrying payload data; map the payload data of each of the one or more spatial streams into a data field of a data unit, wherein a data unit comprises a preamble and a data field carrying one or more OFDM symbols and wherein one or more resource units (RU) are allocated to a data unit; reserve one or more subcarriers within one or more embedded training sequences (ETS) RU blocks (ERUBs) in one or more OFDM symbols in the data field of a data unit, wherein an ERUB spans part of or the complete bandwidth of a RU; and embed one or more ETSs into the one or more reserved subcarriers within one or more ERUBs.

2 . First communication device as claimed in claim 1 ,
wherein the processing circuitry is configured to determine the amount of ETSs to be embedded into a data field of a data unit and/or to determine the amount of ETSs so that the total number of subcarriers in all OFDM symbols used for the ETS embedding is upper bounded by a metric defined as a difference between the number of subcarriers over all employed OFDM symbols, weighted by a training efficiency factor, and the total number of subcarriers used for channel estimation during the preamble.

3 . First communication device as claimed in claim 2 ,
wherein the processing circuitry is configured to determine the amount of ETSs to be embedded into a data field of a data unit based on information about interference collected by the first communication device and/or the second communication device and/or an instruction to increase or decrease the amount.

4 . First communication device as claimed in claim 1 ,
wherein the processing circuitry is configured to not to embed ETSs in the last OFDM symbol carried in a data field.

5 . First communication device as claimed in claim 1 ,
wherein the processing circuitry is configured to check, before mapping payload data into a data field of a data unit, if one or more granularity conditions with respect to the spatial streams are fulfilled once the one or more ETSs are embedded.

6 . First communication device as claimed in claim 5 ,
wherein the processing circuitry is configured to check, as granularity condition, if
the total number of subcarriers in all the OFDM symbols used for ETS embedded inside a data field is divisible by the number of data subcarriers of an OFDM symbol for which no ETS embedding is performed, or
the total number of the subcarriers in all the OFDM symbols used for ETS embedded within one RU inside a data filed is divisible by the number of data subcarriers in the corresponding RU, or
all subcarriers of one or more RUs in all OFDM symbols within a data field are embedded with ETS.

7 . First communication device as claimed in claim 1 ,
wherein the processing circuitry is configured to determine which ERUBs to reserve for embedding ETSs and/or to determine the locations of reserved ERUBs, in time and/or frequency domain, to embed ETSs based on information about interference collected by the first communication device and/or the second communication device.

8 . First communication device as claimed in claim 3 or 7 ,
wherein the information about interference comprises one or more of type of interference, location of interference in time and/or frequency domain, periodicity of interference, coherence time and/or bandwidth of interference, number of interference spatial streams, and spatial channel correlation of interference.

9 . First communication device as claimed in claim 1 ,
wherein the processing circuitry is configured to reserve all subcarriers of one or more ERUBs that span the complete bandwidth of a RU and to embed one or more ETSs into the reserved subcarriers covering one or more OFDM symbols and/or to reserve all subcarriers of one or more ERUBs and to embed one or more ETSs in the reserved subcarriers covering all OFDM symbols in the data field.

10 . First communication device as claimed in claim 1 ,
wherein the processing circuitry is configured to add, into the one or more spatial streams or into one or more data units, signaling information indicating one or more of:
presence of ETSs in a spatial stream or a data unit;
location in time and/or frequency domain, and/or amount of ETSs embedded into spatial stream or a data unit;
predefined pattern of embedding ETSs into a data unit;
adoption of instruction of the second communication device;
type of ERUBs used for embedding one or more ETSs, the type of ERUB indicating if an ERUB is completely used, half used or partly used for embedding ETSs.

11 . First communication device as claimed in claim 1 ,
wherein the processing circuitry is configured to reserve one or more subcarriers of an ERUB and to embed one or more ETSs into the reserved subcarriers of ERUBs, wherein an ERUB is completely used, half used or partly used for embedding one or more ETSs.

12 . First communication device as claimed in claim 1 ,
wherein the processing circuitry comprises either i):
a binary convolutionally encoded (BCC) interleaver, configured to perform a permutation to encoded data bits in BCC interleaver blocks of fixed size within an RU, and
a constellation mapper configured to map encoded data bits into complex data symbols, and
a tone mapper configured to map the complex data symbols into data subcarriers of an ERUB, wherein the number of complex data symbols containing one or more BCC interleaver blocks is equal to the number of data subcarriers in an ERUB that is half or partially used for embedding ETS;
or ii):
a constellation mapper configured to map encoded data bits into complex data symbols, and
a low-density parity-check (LDPC) interleaver configured to perform a permutation to the complex data symbols and map them with a determined mapping distance into data subcarriers of an ERUB, wherein the mapping distance is an integer number that divides the number of data subcarriers in an ERUB, that is half or partially used for embedding ETS, into integer parts.

13 . First communication device as claimed in claim 1 ,
wherein the processing circuitry is configured to use an ETS mapping matrix for mapping the one or more ETSs into the one or more reserved subcarriers within an ERUB.

14 . Second communication device configured to receive data from a first communication device, the second communication device comprising circuitry configured to:
extract, from a received data stream, one or more embedded training sequences (ETSs) that are embedded into one or more reserved subcarriers within one or more ETS RU blocks (ERUBs) that are reserved in one or more OFDM symbols in the data field of a data unit, wherein an ERUB spans part of or the complete bandwidth of a resource unit (RU); extract, from the received data stream, payload data of each of one or more spatial streams mapped into data fields of data units, wherein a data unit comprises a preamble and a data field carrying one or more OFDM symbols and wherein one or more resource units are allocated to a data unit; reconstruct a number of one or more spatial streams, each spatial stream carrying payload data; and perform detection and/or estimation of interference and/or channel state based on the extracted ETSs.

15 . Second communication device as claimed in claim 14 ,
wherein the processing circuitry is configured to extract, from the received data stream, signaling information indicating one or more of:
presence of

Assignees

• Sony Group Corp

Inventors

• Verenzuela Daniel
• Handte Thomas
• Ciochina-Kar Dana
• Tanaka Ken

Classifications

• H04L5/0007

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

• H04L1/0059

  Convolutional codes · CPC title

• H04L5/0092

  Indication of how the channel is divided · CPC title

• H04L5/0051 Primary

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title