US 9,813,168 B2
Self-interference signal cancellation device and method
Taofu Mo, Chengdu (CN); Huajiong Lin, Chengdu (CN); Long Luo, Shenzhen (CN); Bo Han, Chengdu (CN); Weimin Chen, Chengdu (CN); Siqing Ye, Shenzhen (CN); and Linjun Lv, Shenzhen (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen, Guangdong (CN)
Filed on Mar. 28, 2016, as Appl. No. 15/82,420.
Application 15/082,420 is a continuation of application No. PCT/CN2014/087679, filed on Sep. 28, 2014.
Claims priority of application No. 2013 1 0462055 (CN), filed on Sep. 29, 2013.
Prior Publication US 2016/0211927 A1, Jul. 21, 2016
Int. Cl. H04B 15/00 (2006.01); H04B 1/52 (2015.01); H04B 1/12 (2006.01); H04B 1/525 (2015.01)
CPC H04B 15/00 (2013.01) [H04B 1/123 (2013.01); H04B 1/525 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A self-interference signal cancellation device, comprising:
a digital transmit processing module, an analog transmit processing module, a first analog-to-digital conversion module, an analog receive processing module, and a digital receive processing module,
wherein the analog transmit processing module is configured to output a transmit signal for transmission through an air interface to the first analog-to-digital conversion module, forming a self-interference signal, and wherein the first analog-to-digital conversion module is configured to convert the self-interference signal to a digital output signal;
a first signal coupling module, a second analog-to-digital conversion module, a first digital interference reconstruction module, and a digital interference cancellation module,
wherein the first signal coupling module is configured to obtain a first analog signal by coupling the transmit signal output by the analog transmit processing module, and output the first analog signal to a second analog-to-digital conversion module;
wherein the second analog-to-digital conversion module comprises: a filter, a down-converter, and an analog-to-digital converter, and wherein:
the filter is configured to perform filtering processing on the first analog signal, to obtain a first filtered analog signal, and output the first filtered analog signal to the down-converter,
the down-converter is configured to down-convert the first filtered analog signal, to obtain a second analog signal, and output the second analog signal to the analog-to-digital converter, and
the analog-to-digital converter is configured to perform analog-to-digital conversion on the second analog signal, to obtain a first digital signal, and output the first digital signal to the first digital interference reconstruction module,
wherein the first digital interference reconstruction module is configured to perform interference reconstruction according to the first digital signal, to obtain a first digital interference cancellation signal, and output the first digital interference cancellation signal to the digital interference cancellation module, and
wherein the digital interference cancellation module is configured to cancel, according to the first digital interference cancellation signal, the self-interference signal comprised in the digital signal output by the first analog-to-digital conversion module, to obtain a first output signal, and output the first output signal to the digital receive processing module;
a second self-interference cancellation unit configured to:
perform interference reconstruction according to a digital transmit signal output by the digital transmit processing module, to obtain a second digital interference cancellation signal;
perform digital-to-analog conversion on the second digital interference cancellation signal, to obtain a first analog synthesis signal;
cancel, according to the first analog synthesis signal, a self-interference signal in an analog receive signal received by a receive antenna, to remove a linear part of the self-interference signal from the analog receive signal; and
output a signal obtained through the cancellation to the analog receive processing module,
wherein the second self-interference cancellation unit comprises a second digital interference reconstruction module, a second digital-to-analog conversion module, and a first signal synthesis module, wherein:
the second digital interference reconstruction module is configured to perform interference reconstruction according to the digital transmit signal output by the digital transmit processing module, to obtain the second digital interference cancellation signal, and output the second digital interference cancellation signal to the second digital-to-analog conversion module,
the second digital-to-analog conversion module is configured to perform digital-to-analog conversion on the second digital interference cancellation signal, to obtain the first analog synthesis signal, and output the first analog synthesis signal to the first signal synthesis module, and
the first signal synthesis module is configured to cancel, according to the first analog synthesis signal, the self-interference signal in the analog receive signal received by the receive antenna, to remove the linear part of the self-interference signal from the analog receive signal; and
a third self-interference cancellation unit configured to:
obtain a third analog signal by coupling the first analog synthesis signal;
perform analog-to-digital conversion on the third analog signal, to obtain a third digital signal;
perform interference reconstruction according to the third digital signal, to obtain a third digital interference cancellation signal; and
cancel a self-interference signal in the first output signal according to the third digital interference cancellation signal, to obtain a second output signal, and output the second output signal to the digital receive processing module.