Method and system for filtering out adjacent frequency band interference

• US 9,461,682 B2
• Filed: 06/24/2013
• Issued: 10/04/2016
• Est. Priority Date: 10/30/2012
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Liu, Teng
• Primary Examiner(s): LE, NHAN T
• Application Number:
  US14/439,319
• Publication Number:
  US 20150295606A1
• Time in Patent Office: 1,198 Days
• Field of Search: 455 631- 633, 455 76- 78, 455/101, 455/114.2, 455118-120, 455296-299, 455/307, 455/313, 455/334, 455/550.1, 455/552.1
• US Class Current: 1/1
• CPC Class Codes: H01Q 1/521 reducing the coupling between adjacent antennas
• CPC Class Codes: H04B 1/0064 with separate antennas for the more than one band H04B1/0053 takes precedence
• CPC Class Codes: H04B 1/1036 with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters H04B1/123 takes precedence; filter circuits H03H
• CPC Class Codes: H04B 1/109 by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 1/50 using different frequencies for the two directions of communication

Abstract

Provided are a method and a system for filtering out adjacent frequency band interference. The method includes that an RF MEMS switch control module receives a first transmitted coupling signal from a first frequency band RF module and a second received coupling signal from a second frequency band RF module; the RF MEMS switch control module determines whether interference exists between a first frequency band and a second frequency band according to the first transmitted coupling signal and the second received coupling signal; if interference exists, the RF MEMS switch control module filters out the interference by instructing a first frequency band RF MEMS radio frequency reconfigurable antenna working in the first frequency band to change a first antenna structure and/or by instructing a second frequency band RF MEMS radio frequency reconfigurable antenna working in the second frequency band to change a second antenna structure. By means of the disclosure, adjacent frequency bands can co-exist on hardware and mutual interference is effectively avoided.

Claims

1. A method for filtering out adjacent frequency band interference, comprising:

receiving, by a Radio Frequency Micro Electro Mechanical System (RF MEMS) switch control module, a first transmitted coupling signal from a first frequency band RF module and a second received coupling signal from a second frequency band RF module, wherein the first frequency band RF module works in a first frequency band and the second frequency band RF module works in a second frequency band; and

determining, by the RF MEMS switch control module, whether interference exists between the first frequency band and the second frequency band according to the first transmitted coupling signal and the second received coupling signal;

if interference exists, filtering out, by the RF MEMS switch control module, the interference by instructing a first frequency band RF MEMS antenna working in the first frequency band to change a first antenna structure and/or by instructing a second frequency band RF MEMS antenna working in the second frequency band to change a second antenna structure;

wherein the first transmitted coupling signal is formed by coupling, through the first frequency band RF module, a predetermined proportion of enemy of a digital baseband signal which needs to be sent, to the RF MEMS switch control module; and

the second received coupling signal is formed by coupling, through the second frequency band RF module, a predetermined proportion of enemy of a demodulated received digital baseband signal, to the RF MEMS switch control module;

wherein a first working frequency band group of the first frequency band RF MEMS antenna is reconfigurable and comprises at least two different working frequency bands; and

a second working frequency band group of the second frequency band RF MEMS antenna is reconfigurable and comprises at least two different working frequency bands;

wherein a frequency band section of the second working frequency band group is adjacent to a frequency band section of the first working frequency band group.

2. The method according to claim 1, wherein the method is applied to a Long Term Evolution (LTE) Band 7 network and a Wireless Fidelity (WIFI) network.

3. The method according to claim 1, wherein the method is applied to an LTE Band 40 network and a WIFI network.

4. A system for filtering out adjacent frequency band interference, comprising:

a first frequency band RF module, configured to send a Radio Frequency Micro Electro Mechanical System (RF MEMS) switch control module a first transmitted coupling signal, wherein the first frequency band RF module works in a first frequency band;

a second frequency band RF module, configured to send the RF MEMS switch control module a second received coupling signal, wherein the second frequency band RF module works in a second frequency band; and

the RF MEMS switch control module, configured to determine, after receiving the first transmitted coupling signal and the second received coupling signal, whether interference exists between the first frequency band and the second frequency band according to the first transmitted coupling signal and the second received coupling signal, and if interference exists, to filter out the interference by instructing a first frequency band RF MEMS antenna working in the first frequency band to change a first antenna structure and/or by instructing a second frequency band RF MEMS antenna working in the second frequency band to change a second antenna structure;

wherein the first frequency band RF module is further configured to couple a predetermined proportion of enemy of a digital baseband signal which needs to be sent, to the RF MEMS switch control module and to form the first transmitted coupling signal; and

the second frequency band RF module is further configured to couple a predetermined proportion of enemy of a demodulated received digital baseband signal to the RF MEMS switch control module and to form the second received coupling signal;

wherein a first working frequency band group of the first frequency band RF MEMS antenna is reconfigurable and comprises at least two different working frequency bands; and

a second working frequency band group of the second frequency band RF MEMS antenna is reconfigurable and comprises at least two different working frequency bands;

wherein a frequency band section of the second working frequency band group is adjacent to a frequency band section of the first working frequency band group.

5. The system according to claim 4, wherein the system is applied to a Long Term Evolution (LTE) Band 7 network and a Wireless Fidelity (WIFI) network.

6. The system according to claim 4, wherein the system is applied to an LTE Band 40 network and a WIFI network.