Inter-channel linear crosstalk estimation method and apparatus and receiver

Patent metadata

Field	Value
Publication number	US-10892962-B2
Application number	US-201816136817-A
Country	US
Kind code	B2
Filing date	Sep 20, 2018
Priority date	Sep 30, 2017
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

An inter-channel linear crosstalk estimation method and apparatus and a communication system are disclosed. The apparatus includes: an adjacent channel synchronizing unit configured to synchronize adjacent channel information inserted with a cyclic training sequence in a received signal, to determine a time window of occurrence of the cyclic training sequence; a time domain cutoff unit configured to perform time cutoff on center channel information in the received signal according to the time window of occurrence of the cyclic training sequence, to obtain center channel information within the same time window as the cyclic training sequence; a filtering unit configured to filter the center channel information within the time window, and reserve center channel information containing linear crosstalk from an adjacent channel; and a linear crosstalk estimating unit configured to estimate a magnitude of linear crosstalk leaking into the center channel by using a cyclic characteristic of the cyclic training sequence.

First claim

What is claimed is:

1. An inter-channel linear crosstalk estimation apparatus, comprising:
a memory that stores a plurality of instructions; and
a processor coupled to the memory and configured to execute the instructions to:
synchronize adjacent channel information inserted with a cyclic training sequence in a received signal, to determine a time window of occurrence of the cyclic training sequence;
perform time cutoff on center channel information in the received signal in a center channel according to the time window of occurrence of the cyclic training sequence, to obtain center channel information within a same time window as the cyclic training sequence;
filter the center channel information within the time window, and reserve center channel information containing linear crosstalk from an adjacent channel; and
estimate a magnitude of linear crosstalk leaking into the center channel by using a cyclic characteristic of the cyclic training sequence.

2. The apparatus according to claim 1 , wherein the processor further configured to execute the instructions to:
receive a signal containing the center channel information and the adjacent channel information, the adjacent channel information having been inserted with the cyclic training sequence.

3. The apparatus according to claim 2 , wherein the cyclic training sequence includes one or more sequence sections, each sequence section comprising a plurality of temporally repeated data symbols.

4. The apparatus according to claim 3 , wherein adjacent sequence sections are connected to each other in an end to end manner.

5. The apparatus according to claim 1 , wherein in synchronizing adjacent channel information, the processor is configured to execute the instructions to:
filter the received signal, to filter out the center channel information and reserve the adjacent channel information;
synchronize the adjacent channel information according to the cyclic characteristic of the cyclic training sequence, to determine a position of the cyclic training sequence in the adjacent channel information; and
determine the time window of occurrence of the cyclic training sequence according to the position of the cyclic training sequence in the adjacent channel information.

6. The apparatus according to claim 1 , wherein in performing time cutoff on center channel information, the processor configured to execute the instructions to:
filter the center channel information in the received signal; and
perform time cutoff on the filtered center channel information according to the time window of occurrence of the cyclic training sequence, to obtain the center channel information within the same time window as the cyclic training sequence.

7. The apparatus according to claim 6 , wherein a filter used in the filtering of the center channel information in the received signal is one of identical to and different from a filter used in the filtering of the center channel information with respect to type, and comprises one of an all-pass filter, a matched filter, and a band-pass filter.

8. The apparatus according to claim 7 , wherein in filtering the center channel information by using a band-pass filter, the processor is configured to execute the instructions to perform a windowing operation on the band-pass filter by using a window function, the window function comprising one of a rectangular window, a Kaiser window, a Hamming window, and a Blackman window.

9. The apparatus according to claim 1 , wherein in estimating the magnitude of linear crosstalk, the processor configured to execute the instructions to:
perform an autocorrelation on the center channel information within the time window by using L symbol intervals as a cycle, L being the cycle of the cyclic training sequence;
according to a plurality of correlation values with lengths equivalent to a length of the cyclic training sequence appearing after the autocorrelation, calculate a mean value of the plurality of correlation values; and
determine the magnitude of linear crosstalk leaking into the center channel within the time window according to a ratio of the mean value of the plurality of correlation values to power of the center channel information.

10. An inter-channel linear crosstalk estimation method, comprising:
estimating a magnitude of linear crosstalk leaking into a center channel by using information on a training sequence of an adjacent channel; wherein, the training sequence of the adjacent channel is a cyclic training sequence,
wherein the method includes:
synchronizing adjacent channel information inserted with a cyclic training sequence in a received signal, to determine a time window of occurrence of the cyclic training sequence;
performing time cutoff on center channel information in the received signal according to the time window of occurrence of the cyclic training sequence, to obtain center channel information within a same time window as the cyclic training sequence;
filtering the center channel information within the time window, and reserving center channel information containing linear crosstalk from an adjacent channel; and
estimating a magnitude of linear crosstalk leaking into the center channel by using a cyclic characteristic of the cyclic training sequence.

11. The method according to claim 10 , wherein before the synchronizing adjacent channel information, the method further includes:
receiving a signal containing the center channel information and the adjacent channel information, the adjacent channel information having been inserted with the cyclic training sequence.

12. The method according to claim 11 , wherein the cyclic training sequence includes one or more sequence sections, each sequence section including a plurality of temporally repeated data symbols.

13. The method according to claim 12 , wherein adjacent sequence sections are connected to each other in an end to end manner.

14. The method according to claim 10 , wherein the synchronizing of adjacent channel information includes:
filtering the received signal, to filter out the center channel information and reserve the adjacent channel information;
synchronizing the adjacent channel information according to the cyclic characteristic of the cyclic training sequence, to determine a position of the cyclic training sequence in the adjacent channel information; and
determining the time window of occurrence of the cyclic training sequence according to the position of the cyclic training sequence in the adjacent channel information.

15. The method according to claim 10 , wherein the performing of the time cutoff includes:
filtering the center channel information in the received signal; and
performing time cutoff on the filtered center channel information according to the time window of occurrence of the cyclic training sequence, to obtain the center channel information within the same time window as the cyclic training sequence.

16. The method according to claim 15 , wherein a filter used in the filtering of the center channel information in the received signal is one of identical to and different from a filter used in the filtering of the center channel information.

17. The method according to claim 16 , wherein the filter used in the filtering of the center channel information in the received signal and the filter used in the filtering of the center channel information include one of an all-pass filter, a matched filter, and a band-pass filter.

18. The method according to claim 17 , wherein in filtering the center channel information by using a ba

Assignees

• Fujitsu Ltd

Inventors

• Zhang Ke
• Su Xiaofei
• Fan Yangyang
• Tao Zhenning

Classifications

• H04L25/0202

  Channel estimation · CPC title

• H04B10/0795

  Performance monitoring; Measurement of transmission parameters · CPC title

• H04L43/028 Primary

  by filtering · CPC title

• H04L7/0087

  Preprocessing of received signal for synchronisation, e.g. by code conversion, pulse generation or edge detection · CPC title

• H04B10/60

  Receivers · CPC title