Equalization method, equalization device and receiving system

Patent metadata

Field	Value
Publication number	US-12568007-B2
Application number	US-202218843570-A
Country	US
Kind code	B2
Filing date	Mar 11, 2022
Priority date	Mar 11, 2022
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

A receiving system includes one or more subarrays, a phase rotation unit, an equalization unit, and a calculation unit. The subarray includes a set of a plurality of elements having a strong correlation in a Doppler frequency transition. The phase rotation unit performs, on a reception signal received by each element of the subarray, phase rotation processing of a phase rotation amount calculated for the subarray to which the element that has received the reception signal belongs. The equalization unit performs equalization processing on the reception signal subjected to the phase rotation processing. The calculation unit averages phase amounts of the signals received by the elements belonging to the subarray for each subarray, and calculates the phase rotation amount for performing phase compensation using the averaged phase amount.

First claim

The invention claimed is:

1 . An equalization method comprising:
inputting, from one or more subarrays including a set of the plurality of elements having a strong correlation in a Doppler frequency transition, received signals each received by each of the plurality of elements, and performing, on each of the received signals as a reception signal, phase rotation processing of a phase rotation amount calculated for one of the subarrays to which one of the plurality of elements that has received the reception signal belongs; performing equalization processing on the reception signal subjected to the phase rotation processing; and performing calculation processing of averaging phase amounts of the received signals each having been received by each of the plurality of elements belonging to same of the subarrays to calculate averaged phase amount for each of the subarrays, and of calculating the phase rotation amount for performing phase compensation by the phase rotation processing using the averaged phase amount for each of the subarrays.

2 . The equalization method according to claim 1 , wherein
the calculation processing includes applying loop filter processing to the averaged phase amount to calculate the phase rotation amount for each of the subarrays.

3 . The equalization method according to claim 1 , wherein
the calculation processing includes performing (i) comparison processing of comparing a composite signal obtained by combining all the received signals which have been performed the equalization processing with a desired signal, (ii) phase amount calculation processing of calculating the averaged phase amount on the basis of a comparison result of the comparison processing and a result of summing the received signals which have been received by the plurality of elements belonging to the same of the subarrays and have been performed the equalization processing for each of the subarrays, and (iii) phase rotation amount calculation processing of smoothing the averaged phase amount of each of a plurality of symbols to calculate the phase rotation amount for each of the subarrays.

4 . The equalization method according to claim 1 , wherein
the calculation processing includes performing (i) comparison processing of comparing a composite signal obtained by combining all the received signals which have been performed the equalization processing with a desired signal, (ii) phase amount calculation processing of averaging phase amounts obtained on the basis of a comparison result of the comparison processing and the received signals which have been received by the plurality of elements belonging to the same of the subarrays and have been performed the equalization processing for each of the subarrays, and (iii) phase rotation amount calculation processing of smoothing the averaged phase amount of each of a plurality of symbols to calculate the phase rotation amount for each of the subarrays.

5 . The equalization method according to claim 1 , wherein,
in a case where there is one subarray, the calculation processing includes performing phase amount calculation processing of calculating the averaged phase amount on the basis of multiplication of a composite signal obtained by combining all the received signals after the equalization processing by a complex conjugate of a desired signal, and phase rotation amount calculation processing of smoothing the averaged phase amount of each of a plurality of symbols to calculate the phase rotation amount.

6 . The equalization method according to claim 1 , wherein
the set of the plurality of elements having a strong correlation in a Doppler frequency transition is a set of a plurality of the elements which are close together.

7 . An equalization device comprising:
a phase rotation circuitry configured to input, from one or more subarrays including a set of the plurality of elements having a strong correlation in a Doppler frequency transition, received signals each received by each of the plurality of elements, and to perform, on each of the received signals as a reception signal, phase rotation processing of a phase rotation amount calculated for one of the subarrays to which one of the plurality of elements that has received the reception signal belongs; an equalizer configured to perform equalization processing on the reception signal subjected to the phase rotation processing; and a calculator configured to average phase amounts of the received signals each having been received by each of the plurality of elements belonging to same of the subarrays to calculate averaged phase amount for each of the subarrays, and to calculate the phase rotation amount for performing phase compensation by the phase rotation processing using the averaged phase amount for each of the subarrays.

8 . A receiving system comprising:
one or more subarrays including a set of a plurality of elements having a strong correlation in a Doppler frequency transition; a phase rotation circuitry configured to perform, on each of received signals received by the plurality of elements as a reception signal, phase rotation processing of a phase rotation amount calculated for one of the subarrays to which one of the plurality of elements that has received the reception signal belongs; an equalizer configured to perform equalization processing on the reception signal subjected to the phase rotation processing; and a calculator configured to average phase amounts of the received signals each having been received by each of the plurality of elements belonging to same of the subarrays to calculate averaged phase amount for each of the subarrays, and to calculate the phase rotation amount for performing phase compensation by the phase rotation processing using the averaged phase amount for each of the subarrays.

Assignees

• Ntt Inc

Inventors

• Fukumoto Hiroyuki
• Fujino Yosuke
• Omori Seiji
• Ito Yuya
• OIWA Miharu
• Okumura Ryota

Classifications

• H04L2025/03636

  Algorithms using least mean square [LMS] · CPC title

• H04L25/03821

  Inter-carrier interference cancellation [ICI] · CPC title

• H04L25/03146

  with a recursive structure (H04L25/03127 takes precedence) · CPC title

• H04L25/03127

  using only passive components (H04L25/03121 takes precedence) · CPC title

• H04L27/01 Primary

  Equalisers {(baseband equalizers at the transmitter end H04L25/03343; in analogue transmission systems H04B3/04, H04B7/005)} · CPC title