Receiver and method for detecting synchronization in wireless communication system

Patent metadata

Field	Value
Publication number	US-9907041-B2
Application number	US-201514811500-A
Country	US
Kind code	B2
Filing date	Jul 28, 2015
Priority date	Jan 2, 2015
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

The present disclosure provides a method and a receiver for detecting synchronization in a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system. The receiver includes a reception unit that receives a synchronization signal including an interference signal from at least one adjacent cell; and a synchronization detector that cancels the interference signal included in the synchronization signal based on a serial interference cancellation, and detects the synchronization based on the synchronization signal, from which the interference signal is canceled.

First claim

What is claimed is:

1. A receiver for detecting synchronization in a wireless communication system, the apparatus comprising:
a reception unit that receives a synchronization signal including an interference signal from at least one adjacent cell; and
a synchronization detector that cancels the interference signal included in the synchronization signal based on a serial interference cancellation and an estimated channel from which noise is removed, and detects the synchronization based on the synchronization signal, from which the interference signal is canceled,
wherein the synchronization detector comprises:
a channel estimation module that estimates a channel;
a noise removal module that removes the noise from the estimated channel; and
a reconstruction module that reconstructs at least one of a synchronization signal and an interference signal based on the estimated channel, from which the noise is removed.

2. The receiver as claimed in claim 1 , further comprising an interference cancellation module that cancels the reconstructed interference signal from the reconstructed synchronization signal.

3. The receiver as claimed in claim 1 , wherein the channel estimation module comprises:
a fast fourier transform (FFT) operation unit that performs an FFT operation on the received synchronization signal; and
at least one multiplier that multiplies the received synchronization signal by an inverse of a synchronization signal in a frequency domain.

4. The receiver as claimed in claim 1 , wherein the noise removal module comprises:
at least one inverse fast fourier transform (IFFT) operation unit that performs an IFFT operation on the estimated channel; and
a processing unit that, in a time domain, compares power values of signal taps of the estimated channel with a threshold and nulls to zero signal taps having power values less than the threshold.

5. The receiver as claimed in claim 1 , wherein the noise removal module comprises:
at least one IFFT operation unit that performs an IFFT operation on the estimated channel; and
a processing unit that, in a time domain, nulls to zero signal taps having lengths exceeding a maximum length of the channel among signal taps of the estimated channel.

6. The receiver as claimed in claim 1 , wherein the channel estimation module comprises at least one correlator that determines a correlation power of the received synchronization signal.

7. The receiver as claimed in claim 1 , wherein the noise removal module comprises a processing unit that arranges correlation power values of the received synchronization signal and determines a predetermined number of correlation power values in order of the arrangement.

8. The receiver as claimed in claim 6 , further comprising a processing unit that sets, to a maximum delay, a time period according to which the correlation power of the received synchronization signal is determined.

9. The receiver as claimed in claim 1 , wherein the synchronization signal is located in a downlink pilot time slot (DwPTS), which discriminates between cells, between a first time slot and a second time slot, and
wherein the DwPTS comprises a guard period (GP) of 32 chips and a SYNC_DL of 64 chips.

10. A method for detecting synchronization by a receiver in a wireless communication system, the method comprising:
receiving a synchronization signal including an interference signal from at least one adjacent cell;
canceling the interference signal included in the synchronization signal based on a serial interference cancellation and an estimated channel from which noise is removed; and
detecting the synchronization based on the synchronization signal, from which the interference signal is canceled,
wherein canceling the interference signal included in the synchronization signal comprises:
estimating a channel;
removing the noise from the estimated channel; and
reconstructing at least one of a synchronization signal and an interference signal based on the estimated channel, from which the noise is removed.

11. The method as claimed in claim 10 , further comprising canceling the reconstructed interference signal from the reconstructed synchronization signal.

12. The method as claimed in claim 10 , wherein estimating the channel comprises:
performing a fast fourier transform (FFT) operation on the received synchronization signal; and
multiplying the received synchronization signal by an inverse of a synchronization signal in a frequency domain.

13. The method as claimed in claim 10 , wherein removing the noise from the estimated channel comprises:
performing an inverse fast fourier transform (IFFT) operation on the estimated channel;
comparing power values of signal taps of the estimated channel with a threshold in a time domain; and
nulling to zero signal taps having power values less than the threshold.

14. The method as claimed in claim 10 , wherein removing the noise from the estimated channel comprises:
performing an IFFT on the estimated channel; and
nulling to zero signal taps having lengths exceeding a maximum length of the channel among signal taps of the estimated channel, in a time domain.

15. The method as claimed in claim 10 , wherein estimating the channel comprises determining a correlation power of the received synchronization signal.

16. The method as claimed in claim 10 , wherein removing the noise from the estimated channel comprises:
arranging correlation power values of the received synchronization signal; and
determining a predetermined number of correlation power values in order of the arrangement.

17. The method as claimed in claim 15 , comprising setting, to a maximum delay, a time period according to which the correlation power of the received synchronization signal is determined.

18. A receiver for detecting synchronization in a wireless communication system, the receiver comprising:
a chipset configured to:
cancel, based on a serial interference cancellation and an estimated channel from which noise is removed, an interference signal included in a synchronization signal received from at least one adjacent cell; and
detect the synchronization based on the synchronization signal, from which the interference signal is canceled,

wherein canceling the interference signal included in the synchronization signal comprises:
estimating a channel;
removing the noise from the estimated channel; and
reconstructing at least one of a synchronization signal and an interference signal based on the estimated channel, from which the noise is removed.

Assignees

• Park Jeong Soon
• Park Hwan Min
• Kim Sang Woo
• Shim Myung Joon
• Hong Suk Bum
• Hwang Jong Yoon
• Samsung Electronics Co Ltd

Inventors

• Park Jeong Soon
• Park Hwan Min
• Kim Sang Woo
• Shim Myung Joon
• Hong Suk Bum
• Hwang Jong Yoon

Classifications

• H04B1/7087 Primary

  Carrier synchronisation aspects · CPC title

• H04B1/7073

  Synchronisation aspects · CPC title

• H04B1/692

  Hybrid techniques using combinations of two or more spread spectrum techniques · CPC title

• H04B2201/70727

  using fast Fourier transform · CPC title

• H04L25/0202

  Channel estimation · CPC title