Noise floor level reduction device and noise floor level reduction method

Patent metadata

Field	Value
Publication number	US-9838144-B2
Application number	US-201615154014-A
Country	US
Kind code	B2
Filing date	May 13, 2016
Priority date	Jul 15, 2015
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

Provided are a noise floor level reduction device and a noise floor level reduction method capable of reducing a noise floor level. A transmission power measurement system 10 is installed before a signal measurement device 20 including a noise floor level measurement unit 22 that measures a noise floor level, and a measurement unit 24 that subtracts the noise floor level from a level of a signal from a DUT 2 to calculate a level of a signal after subtraction, and includes an LNA 17 provided between the DUT 2 and the signal measurement device 20 for amplifying the signal from the DUT 2, and a termination resistor 16 that terminates an input of the LNA 17, and the termination resistor 16 terminates the input of the LNA 17 in a case in which the noise floor level measurement unit 22 measures the noise floor level.

First claim

What is claimed is:

1. A noise floor level reduction device installed before a signal measurement device comprising noise floor level measurement means for measuring a noise floor level of the signal measurement device and signal level calculation means for subtracting the noise floor level from a level of a signal from a device under test to calculate a level of a signal after subtraction, the noise floor level reduction device comprising:
amplifying means provided between the device under test and the signal measurement device for amplifying the signal from the device under test; and
termination means for terminating an input of the amplifying means,
wherein the termination means terminates the input of the amplifying means on condition that the noise floor level measurement means measures the noise floor level,
the device under test outputs a transmission signal based on a time division duplex scheme as an output signal, and
the signal level calculation means subtracts the noise floor level from a level of the transmission signal to calculate a level of the transmission signal after subtraction.

2. The noise floor level reduction device according to claim 1 , further comprising:
path selection means provided between the device under test and the amplifying means for selecting a path to either the device under test and the termination means,
wherein the path selection means
selects the path to the termination means on condition that the noise floor level measurement means measures the noise floor level, and
selects the path to the device under test on condition that the signal measurement device measures a level of the signal from the device under test.

3. The noise floor level reduction device according to claim 1 ,
wherein a level of the signal from the device under test includes a level in an ON state that is a state in which the device under test outputs a signal, and a level in an OFF state that is a state in which the device under test stops the output of the signal.

4. The noise floor level reduction device according to claim 2 ,
wherein a level of the signal from the device under test includes a level in an ON state that is a state in which the device under test outputs a signal, and a level in an OFF state that is a state in which the device under test stops the output of the signal.

5. A noise floor level reduction method using a noise floor level reduction device installed before a signal measurement device comprising noise floor level measurement means for measuring a noise floor level of the signal measurement device and signal level calculation means for subtracting the noise floor level from a level of a signal from a device under test to calculate a level of a signal after subtraction, the noise floor level reduction device comprising:
amplifying means provided between the device under test and the signal measurement device for amplifying the signal from the device under test; and
termination means for terminating an input of the amplifying means,
wherein the noise floor level reduction method comprises
executing a step (S 12 ) of terminating the input of the amplifying means using the termination means on condition that the noise floor level measurement means measures the noise floor level, and
wherein the device under test
outputs a transmission signal based on a time division duplex scheme as an output signal, and
subtracts the noise floor level from a level of the transmission signal to calculate a level of the transmission signal after subtraction.

6. The noise floor level reduction method according to claim 5 ,
wherein the noise floor level reduction device further comprises:
path selection means provided between the device under test and the amplifying means for selecting a path to either the device under test and the termination means,
wherein noise floor level reduction method executes
a step (S 13 ) of selecting, by the path selection means, the path to the termination means on condition that the noise floor level measurement means measures the noise floor level, and
a step (S 17 ) of selecting, by the path selection means, the path to the device under test on condition that the signal measurement device measures a level of the signal from the device under test.

7. The noise floor level reduction method according to claim 6 ,
wherein a level of the signal from the device under test includes a level in an ON state that is a state in which the device under test outputs a signal, and a level in an OFF state that is a state in which the device under test stops the output of the signal.

8. The noise floor level reduction method according to claim 5 ,
wherein a level of the signal from the device under test includes a level in an ON state that is a state in which the device under test outputs a signal, and a level in an OFF state that is a state in which the device under test stops the output of the signal.

Assignees

• Anritsu Corp

Inventors

• Shiozawa Yoshihiro
• Ito Shinichi
• Inadomaru Momoko

Classifications

• H04B17/346

  Noise values (signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336) · CPC title

• H04W88/08

  Access point devices · CPC title

• H04B17/18

  Monitoring during normal operation · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04B17/345

  Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) · CPC title