WO2015196724A1

WO2015196724A1 - Channel simulator and channel simulation processing method

Info

Publication number: WO2015196724A1
Application number: PCT/CN2014/092147
Authority: WO
Inventors: 陆海涛; 刘喜林; 马伟
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-06-27
Filing date: 2014-11-25
Publication date: 2015-12-30
Also published as: CN105323016A

Abstract

Provided in the present invention are a channel simulator and a channel simulation processing method, the channel simulator comprising: a channel radio frequency input unit, set up to convert a radio frequency input signal into a first baseband input signal; a channel simulation unit, set up to perform channel processing on the first baseband input signal received from the channel radio frequency input unit to acquire a first baseband output signal, or to perform channel processing on a second baseband input signal inputted to a baseband input interface of the channel simulation unit to acquire a second baseband output signal, and to output the first baseband output signal and the second baseband output signal through a baseband output interface, or to transfer the first baseband output signal and the second baseband output signal to a channel radio frequency output unit; a channel radio frequency output unit, set up to convert a first baseband output signal or a second baseband output signal outputted from the channel simulation unit into a radio frequency output signal. By means of the present invention, the interfaces of a channel simulator and the effects of signal type processing are enriched.

Description

Channel simulator and channel simulation processing method

Technical field

The present invention relates to the field of communications, and in particular to a channel simulator and a channel emulation processing method.

Background technique

The wireless channel is a time-varying channel. When a wireless signal passes through such a channel, the fading is: 1 is the transmission loss and dispersion caused by the change of the signal transmission distance; 2 is due to the terrain and buildings in the transmission environment. And the shadow fading caused by the blocking of electromagnetic signals by other obstacles; 3 is that the wireless signal is reflected, diffracted and scattered by the surrounding obstacles on the transmission path, so that it reaches the receiver and is transmitted from multiple paths. The superposition of the signal results in multipath fading caused by the random variation of the amplitude, phase and arrival time of the signal at the receiving end; 4 is the Doppler shift generated by the movement of the receiving terminal in the direction of signal transmission, so that the received signal is in the frequency domain The extension produces additional FM noise and distortion of the received signal.

When studying wireless channels, wireless channels are usually divided into two types: large-scale fading and small-scale fading. The large-scale fading model is used to describe signal strength changes over long distances between transmitter and receiver, including transmission loss, dispersion, and shadow fading. Small-scale fading models are used to describe rapid changes in signal strength over short and short periods of time. , including multipath fading and Doppler shift.

In the related art, the wireless channel simulator generally provides channel emulation of the radio frequency interface, internally converts the radio frequency signal into a baseband signal, performs channelization processing on the baseband signal, and converts the processed baseband signal into a radio frequency signal, and finally The channelized RF signal is output. It can be seen that the wireless channel simulator in the related art can only implement channelization processing on the radio frequency signal, and the application range is limited and the scalability is low.

Therefore, in the related art, when there is a channel processing of a signal by a wireless channel simulator, there is a problem that the signal type is limited.

Summary of the invention

The embodiment of the invention provides a channel emulator and a channel emulation processing method, so as to at least solve the problem that the signal type is limited when there is a channel processing of the signal by the radio channel simulator in the related art.

According to an aspect of an embodiment of the present invention, a channel emulator is provided, including: a channel radio frequency input unit configured to convert a radio frequency input signal into a first baseband input signal; and a channel emulation unit configured to: radio frequency from the channel The first baseband input signal received by the input unit is channelized to obtain a first baseband input Generating a signal, or channelizing a second baseband input signal input from the baseband input interface of the channel emulation unit to obtain a second baseband output signal, and the first baseband output signal, the second baseband output signal Outputting the baseband output interface, or outputting the first baseband output signal and the second baseband output signal to a channel radio frequency output unit; the channel radio frequency output unit is configured to output the same from the channel emulation unit The first baseband output signal or the second baseband output signal is converted to a radio frequency output signal.

Preferably, the channel simulator further comprises: a channel management unit, configured to: first channel fading value for channel emulating the first baseband input signal, and second channel for channel emulation of the second baseband input signal The fading value is written to the channel emulation unit for channel emulation processing.

Preferably, the channel management unit and the channel emulation unit are connected through an Ethernet interface.

Preferably, the channel radio frequency input unit receives the radio frequency input signal through a radio frequency interface, and the channel radio frequency output unit outputs the radio frequency output signal through a radio frequency interface.

Preferably, the channel radio frequency input unit and the channel radio frequency input unit are connected through a universal public radio interface CPRI optical fiber interface, and the channel radio frequency output unit and the channel radio frequency input unit are connected through a common public radio interface CPRI optical fiber interface.

According to another aspect of an embodiment of the present invention, a channel emulation processing method is provided, including: a channel radio frequency input unit converts a radio frequency input signal into a first baseband input signal; and a channel emulation unit receives the radio frequency input unit from the channel The first baseband input signal is channelized to obtain a first baseband output signal, or the second baseband input signal input from the baseband input interface of the channel emulation unit is channelized to obtain a second baseband output signal, and Outputting the first baseband output signal and the second baseband output signal to the baseband output interface, or outputting the first baseband output signal and the second baseband output signal to a channel radio frequency output unit; The output unit converts the first baseband output signal or the second baseband output signal output from the channel emulation unit into a radio frequency output signal;

Preferably, the method further includes: the channel management unit writes a first channel fading value for channel emulation of the first baseband input signal, and a second channel fading value for channel emulation of the second baseband input signal to the The channel emulation unit performs channel emulation processing.

According to an embodiment of the present invention, a channel simulator is used, including: a channel radio frequency input unit configured to convert a radio frequency input signal into a first baseband input signal; and a channel emulation unit configured to receive from the channel radio frequency input unit The first baseband input signal is channelized to obtain a first baseband output signal, or the second baseband input signal input from the baseband input interface of the channel emulation unit is channelized to obtain a second baseband output signal, and the second baseband output signal is obtained. The first baseband output signal, the second baseband output signal is outputted by the baseband output interface, or the first baseband output signal and the second baseband output signal are output to a channel radio frequency output unit; a channel radio frequency output unit And configured to convert the first baseband output signal or the second baseband output signal output from the channel emulation unit into a radio frequency output signal. In the related art, when the wireless channel simulator performs channel processing on the signal, there is a problem that the signal type is limited, thereby further enriching the interface of the channel simulator and the effect on the signal type processing.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a block diagram showing the structure of a channel emulator according to an embodiment of the present invention;

2 is a block diagram showing a preferred structure of a channel emulator according to an embodiment of the present invention;

3 is a flowchart of a channel emulation processing method according to an embodiment of the present invention;

4 is a channel simulator compatible with a radio frequency and baseband interface, in accordance with an embodiment of the present invention;

FIG. 5 is a schematic diagram of a connection structure supporting a radio frequency-radio frequency emulation interface according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a connection structure supporting a radio frequency-baseband emulation interface according to an embodiment of the present invention;

7 is a schematic diagram of a connection structure of a support baseband-radio frequency emulation interface according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a connection structure supporting a baseband-baseband emulation interface according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

A channel emulator is also provided in this embodiment, and the device is configured to implement the foregoing embodiments and preferred embodiments, and details are not described herein. As used below, the term "unit module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

1 is a structural block diagram of a channel emulator according to an embodiment of the present invention. As shown in FIG. 1, the channel emulator includes a channel radio frequency input unit 12, a channel emulation unit 14, and a channel radio frequency output unit 16, which are The channel simulator is described.

The channel radio frequency input unit 12 is configured to convert the radio frequency input signal into the first baseband input signal; the channel emulation unit 14 is connected to the channel radio frequency input unit 12 and the channel radio frequency output unit 16 and is configured to receive from the channel radio frequency input unit. The first baseband input signal is channelized to obtain a first baseband output signal, or the second baseband input signal input from the baseband input interface of the channel emulation unit is channelized to obtain a second baseband output signal, and the first baseband is obtained The output signal, the second baseband output signal is outputted by the baseband output interface, or the first baseband output signal and the second baseband output signal are output to the channel radio frequency output unit; the channel radio frequency output unit 16 is set to output from the channel emulation unit A baseband output signal or a second baseband output signal is converted to an RF output signal.

2 is a block diagram showing a preferred structure of a channel emulator according to an embodiment of the present invention. As shown in FIG. 2, the channel emulator includes a channel management unit 22 in addition to all the units shown in FIG. The management unit 22 will explain.

The channel management unit 22 is connected to the channel emulation unit 14 and configured to write a first channel fading value for channel emulation of the first baseband input signal and a second channel fading value for channel emulation of the second baseband input signal to The channel emulation unit performs channel emulation processing.

The channel management unit and the channel emulation unit may be connected through an Ethernet interface. The channel RF input unit can receive the RF input signal through the RF interface, and the channel RF output unit can output the RF output signal through the RF interface. The channel RF input unit and the channel RF input unit can be connected through a common public wireless interface CPRI optical interface, and the channel RF output unit and the channel RF input unit can be connected through a common public wireless interface CPRI optical interface.

In this embodiment, a channel emulation processing method is also provided. FIG. 3 is a flowchart of a channel emulation processing method according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps:

Step S302, the channel radio frequency input unit converts the radio frequency input signal into a first baseband input signal;

Step S304, the channel emulation unit performs channelization processing on the first baseband input signal received from the channel radio frequency input unit to obtain a first baseband output signal, or performs channelization on a second baseband input signal input from a baseband input interface of the channel emulation unit. The second baseband output signal is obtained, and the first baseband output signal and the second baseband output signal are outputted as a baseband output interface, or the first baseband output signal and the second baseband output signal are output to the channel radio frequency output unit;

Step S306, the channel radio frequency output unit converts the first baseband output signal or the second baseband output signal output from the channel emulation unit into a radio frequency output signal;

The channel management unit may further write, by the channel management unit, a first channel fading value for channel emulation of the first baseband input signal and a second channel fading value for channel emulation of the second baseband input signal to the channel emulation unit for channel emulation processing. .

The channel management unit and the channel emulation unit are connected through an Ethernet interface. The channel RF input unit receives the RF input signal through the RF interface, and the channel RF output unit outputs the RF output signal through the RF interface. The channel RF input unit and the channel RF input unit are connected through a common public wireless interface CPRI optical interface, and the channel RF output unit and the channel RF input unit are connected through a common public wireless interface CPRI optical interface.

In view of the above problems of the related art, in the face of the problems of the related technologies, for example, in some channel simulation scenarios, such as verifying the performance of the baseband algorithm, the performance of the physical layer codec, etc., it is often desirable to exclude the interference of the radio frequency signal, but only in the The baseband signal analyzes the verification model. Therefore, it is hoped that the wireless channel simulator can provide a radio frequency interface, and can also provide a baseband interface to perform channel simulation on the scene model with a more comprehensive simulation level. Based on the above analysis of the problem, in the present embodiment, a channel simulator device and a working method compatible with the radio frequency and baseband interface are provided, and various combinations of radio frequency-radio frequency, radio frequency-baseband, baseband-radio frequency, baseband-baseband are provided. The interface connects base stations and terminal devices in different scenarios, and enriches the channel emulation verification interface model.

4 is a channel emulator compatible with a radio frequency and a baseband interface. As shown in FIG. 4, the device includes the following modules: a channel radio frequency input unit 42 (same as the above-mentioned channel radio frequency input unit 12), and a channel radio frequency output unit. 44 (same as the above-mentioned channel radio frequency output unit 14), channel emulation unit 46 (same as channel emulation unit 16 described above), and channel management unit 48 (same as channel management unit 22 described above), the device will be described below:

The channel RF input unit 42 is connected to a radio remote signal unit (Radio Remote Unit, RRU for short) or a radio frequency signal interface of the terminal, and converts the radio frequency signal through analog down conversion, analog to digital conversion, digital down conversion, and uplink data processing. For the baseband signal, a 2.45 Gbps, 4.9 Gbps, 9.8 Gbps optical interface connection channel emulation unit is provided, which supports a CPRI (Common Public Radio Interface) transmission protocol; the channel radio frequency output unit 44 is opposite to the channel radio frequency input unit 32, and is a baseband signal. Converted to RF signal, provide CPRI fiber interface connection channel simulation unit, convert the baseband signal into RF signal through downlink data processing, digital up-conversion, digital-to-analog conversion, analog up-conversion, etc., and connect to the base station RRU through the RF interface. Or a terminal; the channel emulation unit 46 only provides a CPRI fiber interface, inputs/outputs baseband data, and performs channelization processing on the baseband data; and the channel management unit 48 writes the channel fading value to be simulated to the channel emulation unit through the Ethernet interface. Channelization processing of baseband data.

By providing compatible radio frequency and baseband interfaces, different types of base stations and terminal devices are connected to implement channel emulation at different levels such as air interface and baseband processing.

The following describes the working method of the multi-antenna wireless channel simulator supporting the radio frequency and baseband hybrid interface according to the embodiment of the present invention. The multi-antenna wireless channel emulator can adopt the following emulation interfaces: providing an RF-RF emulation interface; providing an RF-baseband Simulation interface; provide baseband-RF simulation interface; provide baseband-baseband emulation interface. The working method using the above simulation interface will be described below.

FIG. 5 is a schematic diagram of a connection structure supporting a radio frequency-radio frequency emulation interface according to an embodiment of the present invention. As shown in FIG. 5, a radio frequency interface of a base station RRU or a terminal is connected to a channel radio frequency input unit and a channel output unit of the present invention.

6 is a schematic diagram of a connection structure supporting a radio frequency-baseband emulation interface according to an embodiment of the present invention. As shown in FIG. 6, a radio frequency interface of a base station RRU or a terminal is connected to a channel radio frequency input unit of the present invention, and a base station BBU (Base Band Unit) or The baseband interface of the terminal is coupled to the channel emulation unit of the present invention.

FIG. 7 is a schematic diagram of a connection structure of a baseband-radio frequency emulation interface according to an embodiment of the present invention. As shown in FIG. 7, a baseband interface of a base station (BBU) or a baseband interface of a terminal is connected to a channel emulation unit according to an embodiment of the present invention. Or the radio frequency interface of the terminal is connected to the channel radio frequency input unit of the embodiment of the present invention.

FIG. 8 is a schematic diagram of a connection structure supporting a baseband-baseband emulation interface according to an embodiment of the present invention. As shown in FIG. 8, a baseband interface of a base station (BBU) or a baseband interface of a terminal is connected to a channel emulation unit according to an embodiment of the present invention.

Obviously, those skilled in the art should understand that the above modules or steps of the embodiments of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed in multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, thereby They may be stored in a storage device by a computing device, and in some cases, the steps shown or described may be performed in an order different than that herein, or separately fabricated into individual integrated circuit modules, or Implementing multiple modules or steps in them as a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

As described above, a channel emulator and channel emulation processing method provided by an embodiment of the present invention has the following beneficial effects: greatly enriching the interface of the channel emulator and the effect on signal type processing.

Claims

A channel simulator comprising:

a channel RF input unit configured to convert the RF input signal into a first baseband input signal;

a channel emulation unit configured to perform channelization processing on the first baseband input signal received from the channel radio frequency input unit to obtain a first baseband output signal, or input from a baseband input interface of the channel emulation unit The second baseband input signal is channelized to obtain a second baseband output signal, and the first baseband output signal and the second baseband output signal are outputted by the baseband output interface, or the first baseband output signal, The second baseband output signal is output to a channel radio frequency output unit;

a channel radio frequency output unit configured to convert the first baseband output signal or the second baseband output signal output from the channel emulation unit into a radio frequency output signal;
The channel emulator according to claim 1, further comprising: a channel management unit configured to perform a channel emulation first channel fading value for said first baseband input signal, and said second baseband input signal The second channel fading value of the channel emulation is written to the channel emulation unit for channel emulation processing.
The channel emulator according to claim 2, wherein said channel management unit and said channel emulation unit are connected by an Ethernet interface.
The channel emulator according to claim 1, wherein the channel radio frequency input unit receives the radio frequency input signal through a radio frequency interface, and the channel radio frequency output unit outputs the radio frequency output signal through a radio frequency interface.
The channel emulator according to claim 1, wherein the channel radio frequency input unit and the channel radio frequency input unit are connected through a common public radio interface CPRI optical fiber interface, and the channel radio frequency output unit and the channel radio frequency input unit pass General public wireless interface CPRI fiber interface connection.
A channel simulation processing method includes:

The channel RF input unit converts the RF input signal into a first baseband input signal;

The channel emulation unit performs channelization processing on the first baseband input signal received from the channel radio frequency input unit to obtain a first baseband output signal, or a second baseband input input from a baseband input interface of the channel emulation unit The signal is channelized to obtain a second baseband output signal and The first baseband output signal, the second baseband output signal is outputted by the baseband output interface, or the first baseband output signal and the second baseband output signal are output to a channel radio frequency output unit;

The channel radio frequency output unit converts the first baseband output signal or the second baseband output signal output from the channel emulation unit into a radio frequency output signal;
The method according to claim 6, further comprising: a channel management unit that performs a channel emulation first channel fading value for the first baseband input signal, and a channel emulation second for the second baseband input signal The channel fading value is written to the channel emulation unit for channel emulation processing.
The method of claim 7, wherein the channel management unit and the channel emulation unit are connected by an Ethernet interface.
The method according to claim 6, wherein the channel radio frequency input unit receives the radio frequency input signal through a radio frequency interface, and the channel radio frequency output unit outputs the radio frequency output signal through a radio frequency interface.
The method according to claim 6, wherein the channel radio frequency input unit and the channel radio frequency input unit are connected through a common public radio interface CPRI optical fiber interface, and the channel radio frequency output unit and the channel radio frequency input unit are generally public Wireless interface CPRI fiber interface connection.