Calibration method for parallel multi-channel wireless channel measurement and system for the same

• US 10,362,551 B2
• Filed: 08/06/2017
• Issued: 07/23/2019
• Est. Priority Date: 04/02/2017
• Status: Active Grant

• Current Assignee: Shanghai Research Center For Wireless Communications
• Original Assignee: Shanghai Research Center For Wireless Communications
• Inventors: Cai, Zhong-fei, Gui, Yun-song, Wang, Hao-wen, Zhou, Ming-tuo, Yang, Yang, Wang, Hai-feng
• Primary Examiner(s): Nguyen, Brian D
• Application Number:
  US15/669,931
• Publication Number:
  US 20180288723A1
• Time in Patent Office: 716 Days
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 17/0085 using test signal generators
• CPC Class Codes: H04B 17/14 of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04B 17/30 of propagation channels
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04J 2013/0096 Network synchronisation
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 56/0065 using measurement of signal travel time

Abstract

The present invention discloses a calibration method for parallel multi-channel wireless channel measurement and a calibration system thereof. The transmitting end and the receiving end are disconnected, and are respectively connected to the calibration receiving channel and the calibration transmitting channel, and the calibration receiving channel/calibration transmitting channel cooperates with a measurement channel in air interface measurement, to calibrate a channel response characteristic of the transmitting end and the receiving end. By means of the present invention, a current channel response characteristic between multiple channels can be online supervised in real time, so as to ensure that a measurement error because of an impact of mutual interference between multiple channels can be avoided in the channel measurement process.

Claims

1. A calibration method for parallel multi-channel wireless channel measurement, wherein a calibration receiving channel is added at a transmitting end and a calibration transmitting channel is added at a receiving end, and the method comprising the following steps:

disconnecting the transmitting end and the receiving end,

connecting the transmitting end with the calibration receiving channel,

connecting the receiving end with the calibration transmitting channel, and

recording channel response characteristic of the transmitting end and the receiving end with cooperation of the calibration receiving channel and the calibration transmitting channel in air interface measurement, the receiving end acquires a peak value by using a correlation between orthogonal sequences, and transforms the peak value to a frequency domain by using FFT, to measure a frequency response matrix of channels.

2. The calibration method according to claim 1, wherein:

in a calibration process, the transmitting end parallel transmits multi-channel data, and the receiving end parallel receives multi-channel data in a code division multiplexing manner.

3. The calibration method according to claim 2, further comprising,

Before the step of disconnecting the transmitting end and the receiving end, directly connecting the transmitting end and the receiving end, disconnecting the calibration receiving channel and the calibration transmitting channel, and testing a response characteristic of a passive device.

4. The calibration method according to claim 1, wherein:

the receiving end selects a j^th receiving channel, generates a local sequence of an i^th transmitting channel of the transmitting end, performs a correlation operation on a receiving sequence of the j^th receiving channel and the local sequence of the i^th transmitting channel to acquire the correlation peak value, wherein both i and j are positive integers;

then transforms the correlation peak value to the frequency domain by using FFT, to acquire a frequency domain channel response characteristic; and

acquires channel responses of all channels as the frequency response matrix.

5. The calibration method according to claim 1, wherein:

calibrating the channel response characteristic of the transmitting end and the receiving end with a measurement transmitting channel and a measurement receiving channel,

when the measurement transmitting channel in a silent period, the calibration transmitting channel transmits a narrow pulse signal for circularly testing, and

transmission of the narrow pulse signal satisfies a time delay requirement of the measurement transmitting channel and the measurement receiving channel.

6. The calibration method according to claim 5, wherein:

when the transmitting end transmits a signal, the calibration transmitting channel is closed;

after transmission of the signal, the calibration transmitting channel begins to transmit the narrow pulse signal.

7. The calibration method according to claim 1, wherein:

at the transmitting end and the receiving end, a pulse per second is used as an initial synchronization trigger signal source; and

a periodic trigger signal is generated with the initial synchronization trigger signal used as a reference signal, and is then transmitted to the calibration transmitting channels and the calibration receiving channels.

8. A calibration system for parallel multi-channel wireless channel measurement comprising:

a transmitting end including a combiner and a calibration receiving channel, the calibration receiving channel selectively connecting to an output end of the combiner; and

a receiving end including a splitter and a calibration transmitting channel, the calibration transmitting channel selectively connecting to an input end of the splitter,

in a condition that the transmitting end disconnect with the receiving end, the calibration receiving channel connects to the output end of the combiner at the transmitting end and the calibration transmitting channel connects to the input end of the splitter at the receiving end;

in a condition that the transmitting end connects with the receiving end, the calibration receiving channel disconnects to the output end of the combiner at the transmitting end and the calibration transmitting channel disconnects to the input end of the splitter at the receiving end.

9. The calibration system according to claim 8, wherein:

the transmitting end further includes a plurality of splitters, whose output ends connect with an input end of the combiner at the transmitting end;

the receiving end further includes a plurality of combiners, whose input ends connect to an output end of the splitter at the receiving end.