WO2016019843A1

WO2016019843A1 - Multi-antenna implementation method, device and system

Info

Publication number: WO2016019843A1
Application number: PCT/CN2015/086010
Authority: WO
Inventors: 张毅
Original assignee: 华为技术有限公司
Priority date: 2014-08-06
Filing date: 2015-08-04
Publication date: 2016-02-11
Also published as: CN105337646A; CN105337646B

Abstract

Provided are a multi-antenna implementation method, device and system. In a multi-antenna system, frequency conversion of different frequency points is performed via an LMU on signals within a plurality of antenna channel signals outputted by a base station except for one signal, and the signals which have undergone frequency conversion and the signal which has not undergone frequency conversion are sent to a UE and RMBs after being combined, the RMBs restoring the signals which have undergone frequency conversion to the original frequency points and sending the signals to the UE, so that the UE simultaneously receives the signal within the combined signals which has not undergone frequency conversion and the restored signals sent by the RMBs. The UE can thus simultaneously receive a plurality of signals without the number of antennae being increased. Therefore, multi-antenna technology can be implemented without increasing antenna deployment, and system performance can be improved without increasing costs.

Description

Multi-antenna implementation method, device and system

Technical field

The present invention relates to the field of communications technologies, and in particular, to a multi-antenna implementation method, apparatus, and system.

Background technique

Multi-input Multiple-Output (MIMO) is one of the cores of the Long Term Evolution (LTE) system. It is provided by deploying a large number of antennas indoors and outdoors. More space freedom, which in turn improves system performance. Considering the limitations of the antenna installation space and the processing power of the terminal, the outdoor system of the commercial LTE system generally adopts a two-antenna transmission mode. In order to further improve system performance, technologies such as massive MIMO have emerged as the evolution of MIMO technology. Massive MIMO provides more degrees of freedom by introducing a large number of antennas, thereby increasing system capacity. In a prior art, the above-mentioned plurality of antennas are usually placed in an iron tower, a roof or other high places, connected to a remote radio unit (RRU) through a feeder, and then connected to a baseband unit through an optical fiber. (Baseband Unit, hereinafter referred to as BBU). In the above outdoor system, since the dual antenna system is adopted, the antenna feeder system of the base station needs to be upgraded in order to support the large-scale antenna, and since the antenna is large in size, a large number of antennas need to occupy a large amount of space, which greatly increases the deployment cost.

In the current commercial LTE system indoor system, the BBU and the RRU are set on the base station side, and the signal is distributed to each floor through a feeder connected to the base station, and the signal power is allocated to the floor through the coupler of each floor, and the signal after the power is distributed. The power splitter further divides the power and transmits it through the antenna. Since the above indoor system uses a single feeder, no matter whether the base station of the system has several antenna ports, it will be configured as a single antenna channel, so the indoor system can only support single input and single output (Single- Input Single-Output, hereinafter referred to as SISO), cannot support MIMO, so multi-antenna technology cannot be implemented.

Summary of the invention

Embodiments of the present invention provide a multi-antenna implementation method, apparatus, and system, which can implement multi-antenna technology without increasing antenna deployment, thereby improving system performance without increasing cost.

In a first aspect, an indoor multi-antenna system is provided. The indoor multi-antenna system includes: a base station, a local multiple input multiple output unit LMU, a combining unit, a feeder, and at least one signal transmitting and receiving branch connected to the feeder, and At least one remote input multi-output box RMB; wherein the base station outputs a plurality of antenna channel signals;

The LMU is configured to frequency-convert other antenna channel signals other than the first antenna channel signal of the plurality of antenna channel signals to obtain other antenna channel signals after frequency conversion, wherein each of the other antenna channel signals after the frequency conversion is used The frequency of the signal is different;

The combining unit is configured to combine the first antenna channel signal and the frequency-converted other antenna channel signals to obtain a combined signal; and the combined signal is transmitted to the at least one signal through the feeder Transmitting and transmitting a branch, and transmitting the combined signal to the user equipment and the at least one of the RMBs;

The RMB is used to restore a frequency point of at least one of the converted other antenna channel signals to the same frequency point as the first antenna channel signal, to obtain at least one of the received combined signals. Recovering the antenna channel signal, and transmitting the at least one restored antenna channel signal to the user equipment;

The user equipment is configured to receive the combined signal sent by a signal transceiver branch, acquire the first antenna channel signal in the combined signal, and receive the at least one recovery sent by at least one of the RMB Rear antenna channel signal.

In combination with the first aspect, in the first possible implementation manner, the method further includes:

The user equipment is configured to send an uplink signal to the one signal transceiver branch and the at least one RMB;

The RMB is configured to receive the uplink signal, perform frequency conversion on the received uplink signal, obtain an up-converted uplink signal, and send the frequency-converted uplink signal to the one signal transceiver branch;

The one signal transmitting and receiving branch is configured to receive the uplink signal and the frequency-converted uplink signal, and pass the uplink signal and the frequency-converted uplink signal as one signal The feeder is transmitted to the LMU;

The LMU is configured to restore the frequency-converted uplink signal to the same frequency point as the uplink signal, obtain a recovered uplink signal, and transmit the uplink signal and the recovered uplink signal to the Said base station.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner,

The combining unit is externally connected to the LMU, wherein a first end of the LMU is connected to the base station, and a second end of the LMU is connected to a first end of the combining unit, the combining unit The second end of the second end is connected to each of the signal transceiver branches through the feeder;

Alternatively, the combining unit is built in the LMU, the first end of the LMU is connected to the base station, and the second end of the LMU is connected to each of the signal transmitting and receiving branches through the feeder;

The LMU is externally connected to the base station or built in the base station;

The signal transmitting branch includes: a coupler, a power splitter, and at least one antenna, an input end of the coupler is connected to the feeder, an output of the coupler, and an input of the power splitter The terminals are connected, and the output of the power splitter is connected to each of the antennas.

In conjunction with the second possible implementation of the first aspect, in a third possible implementation, the combining unit is specifically configured to:

Obtaining at least one of a reference clock signal, a preset synchronization signal, and an operation and maintenance signal of a preset frequency output by the base station;

Combining the first antenna channel signal, the frequency-converted other antenna channel signal, and the signal of the preset frequency, the preset synchronization signal, and the operation and maintenance signal to obtain a path The combined signal.

With reference to the third possible implementation of the first aspect, in a fourth possible implementation, the reference clock signal includes a signal with a frequency of 10 MHz or a signal with a frequency of 122.88 MHz;

When the indoor multi-antenna system is applied to a time division duplex system, the preset synchronization signal is a control signal for transmitting and receiving switching;

The operation and maintenance signal includes at least one of a gain control signal, a delay control signal, and a phase adjustment signal.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation, the RMB is further configured to:

And adjusting, according to the operation and maintenance signal, a transmission characteristic parameter of a downlink of the RMB, where the transmission characteristic parameter of the downlink includes at least one of an amplification gain, a delay parameter, and a phase parameter.

In conjunction with the first possible implementation of the first aspect, in a sixth possible implementation, the RMB is further configured to:

Adjusting, according to the received combined signal, or according to the uplink signal sent by the user equipment, a downlink transmission characteristic parameter of the RMB; the downlink transmission characteristic parameter includes an amplification gain At least one of a delay parameter and a phase parameter.

In conjunction with the first possible implementation of the first aspect, in a seventh possible implementation, the base station is further configured to:

And adjusting, according to the uplink signal sent by the user equipment, or a channel status indication sent by the user equipment, a downlink transmission characteristic parameter of the RMB, where the downlink transmission characteristic parameter includes an amplification At least one of a gain, a delay parameter, and a phase parameter.

With reference to the second possible implementation of the first aspect, in an eighth possible implementation, the base station is further configured to:

During initialization, the parameters of the signals transmitted by the multiple antenna channels of the base station are adjusted according to the initial transmission characteristic parameters of the downlink of the RMB, so that the antenna channel signals transmitted by the multiple antenna channels are adjusted. The error of the parameter is within the preset range;

The initial transmission characteristic parameter of the downlink includes: at least one of an amplification gain, a delay parameter, and a phase parameter;

The parameters of the antenna channel signal include at least one of delay, amplitude, and phase.

With reference to the second possible implementation of the first aspect, in a ninth possible implementation, the user equipment is further configured to acquire measurement results according to all antenna channel signals that the user equipment can receive, and Transmitting the measurement result to the base station, where the measurement result includes a signal to noise ratio of each antenna channel signal that can be received;

The base station is further configured to adopt a proportional fairness criterion according to the measurement result, the data scheduled by the user equipment in a specified time, and the current data transmission rate of the user equipment. The user equipment schedules time-frequency resources.

The second aspect provides a local multiple input multiple output unit LMU. The LMU includes: at least one downlink transmission unit, where the downlink transmission unit includes: a first frequency converter, a first filter, a first power amplification module, and a first Diplexer;

Wherein, a signal of any antenna channel of the base station is input from a first input end of the first frequency converter, and an output end of the first frequency converter is connected to an input end of the first filter, the first filtering An output end of the device is connected to an input end of the first power amplifying module, an output end of the first power amplifying module is connected to an input end of the first duplexer, and an output end of the first duplexer Connect the feeders in the indoor multi-antenna system.

With reference to the second aspect, in a first possible implementation, the downlink transmission unit further includes: a second filter, a power splitter, a second power amplification module, and a first phase locked loop;

The input end of the second filter is used to input a reference clock signal, the output end of the second filter is connected to the input end of the power splitter, and the first output end of the power splitter is connected to the An input end of the first phase locked loop, an output end of the first phase locked loop is connected to a second input end of the first frequency converter, and a second output end of the power splitter is connected to the second power amplification module The input end of the second power amplifying module is connected to the first duplexer;

A preset synchronization signal and an operation and maintenance signal are connected to the first duplexer.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation, the LMU further includes: at least one uplink transmission unit, where the uplink transmission unit includes: a second duplex , a third power amplification module, a fourth power amplification module, a second frequency converter, a third filter, and a fifth power amplification module;

The input end of the second duplexer is connected to a feeder in the indoor multi-antenna system, and the first output end of the second duplexer is connected to the input end of the third power amplifying module, the third power The output end of the amplification module is connected to the base station in the indoor multi-antenna system; the second output end of the second duplexer is connected to the input end of the fourth power amplification module, and the output end of the fourth power amplification module Connecting a first input end of the second frequency converter, an output end of the second frequency converter is connected to an input end of the third filter, and an output end of the third filter is connected to the fifth power amplification module The output of the fifth power amplifying module is connected to the base station.

In conjunction with the second possible implementation of the second aspect, in a third possible implementation The uplink transmission unit further includes: a sixth power amplification module and a second phase locked loop;

The input end of the sixth power amplifier is used to input a reference clock signal, the output end of the sixth power amplifier is connected to the input end of the second phase locked loop, and the output end of the second phase locked loop is connected. a second input of the second frequency converter.

With reference to the third possible implementation of the second aspect, in a fourth possible implementation, the second power amplifying module, the third power amplifying module, the fourth power amplifying module, the a five power amplification module, the sixth power amplification module is a power amplifier;

The first power amplification module is composed of a gain adjustable power amplifier and a power amplifier connected in series.

In a third aspect, a remote input multiple output box RMB is provided, where the RMB includes: at least one downlink transmission unit, a first antenna, and a second antenna, where the downlink transmission unit includes: a first duplexer, a first power An amplification module, a first frequency converter, a first filter, and a second power amplification module;

The first antenna is connected to an input end of the first duplexer, and a first output end of the first duplexer is connected to an input end of the first power amplifier, where the first power amplification module is The output end is connected to the first input end of the first frequency converter, the output end of the first frequency converter is connected to the input end of the first filter, and the output end of the first filter is connected to the second power An input end of the amplification module, and an output end of the second power amplification module is connected to the second antenna.

With reference to the third aspect, in a first possible implementation, the downlink transmission unit further includes: a third power amplification module, a first phase locked loop;

The second output end of the first duplexer is connected to the input end of the third power amplifying module, and the second output end of the first duplexer is configured to output the received reference clock signal, The output end of the third power amplifying module is connected to the input end of the phase locked loop, and the output end of the phase locked loop is connected to the second input end of the first frequency converter.

With the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation, the RMB further includes: at least one uplink transmission unit, where the uplink transmission unit includes: a second filter a fourth power amplification module, a second frequency converter, a third filter, and a fifth power amplification module;

The first antenna is connected to the input end of the second filter, the output end of the second filter is connected to the input end of the fourth power amplifying module, and the output end of the fourth power amplifying module is connected. a first input end of the second frequency converter, an output end of the second frequency converter is connected to an input end of the third filter, and an output end of the third filter is connected to an input of the fifth power amplifier The output of the fifth power amplifier is connected to the second antenna.

With the second possible implementation of the third aspect, in a third possible implementation, the uplink transmission unit further includes: a fourth filter, a power splitter, and a second phase locked loop;

The input end of the fourth filter is used to input a reference clock signal, the output end of the fourth filter is connected to the input end of the power splitter, and the output end of the power splitter is connected to the second An input end of the phase locked loop, and an output end of the second phase locked loop is connected to the second input end of the second frequency converter.

In conjunction with the third possible implementation of the third aspect, in a fourth possible implementation,

The first power amplification module, the third power amplification module, and the fourth power amplification module are power amplifiers;

The second power amplification module and the fifth power amplification module are composed of a gain adjustable power amplifier and a power amplifier connected in series.

According to a fourth aspect, an indoor multi-antenna system includes: a base station, a local multiple input multiple output unit LMU, a combining unit, a feeder, and at least one signal transmitting and receiving branch connected to the feeder, and At least one remote input multi-output box RMB; wherein the base station outputs a plurality of antenna channel signals;

The base station is configured to perform an inverse fast Fourier transform IFFT or an inverse discrete Fourier transform IDFT on the first antenna channel signal of the multiple antenna channel signals to obtain a discrete first antenna channel signal, and the first antenna channel Other antenna channel signals other than the signal are combined with the first data for IFFT or IDFT to obtain discrete other antenna channel signals;

The LMU is configured to modulate the discrete other antenna channel signals to obtain modulated other antenna channel signals;

The base station buffers the modulated first antenna channel signal and transmits the signal to the combining unit, and the LMU transmits the modulated other antenna channel signal to the combining unit;

The combining unit is configured to combine the discrete first antenna channel signals with the modulated other antenna channel signals to obtain a combined signal; the combining unit passes the combined road through the feeder Transmitting a signal to the at least one signal transceiving branch, and transmitting the combined signal to the user equipment and the at least one of the RMBs;

The RMB is configured to demodulate at least one of the modulated other antenna channel signals into the received combined signal to obtain at least one demodulated other antenna channel signal, and then perform the demodulation The other antenna channel signals are FFT or DFT to remove the first data, obtain the original signal of at least one other antenna channel signal, and then perform the IFFT or IDFT on the original signal of the at least one other antenna channel signal to obtain at least one a discrete other antenna channel signal that is the same as a frequency of the discrete first antenna channel signal, and the at least one discrete other antenna channel signal that is the same as the frequency of the discrete first antenna channel signal Said user equipment to send;

The user equipment is configured to receive the combined signal sent by a signal transceiver branch, acquire the discrete first antenna channel signal in the combined signal, and receive the at least one of the at least one of the RMB transmissions A discrete other antenna channel signal that is the same as the frequency of the discrete first antenna channel signal.

In combination with the fourth aspect, in a first possible implementation manner,

The signal transmitting branch includes: a coupler, a power splitter, at least one antenna, an input end of the coupler is connected to the feed line, and an output end of the coupler is connected to an input end of the power splitter The output of the power splitter is connected to each of the antennas.

The fifth aspect provides an outdoor multi-antenna system, where the outdoor multi-antenna system includes: a base station, a local module, a first antenna module, a second antenna module, at least one evolved remote radio unit, and at least one evolved remote module; The base station outputs a plurality of antenna channel signals to At least two antenna channel signals are in a group, and the number of signals in each group of antenna channel signals is the same;

Transmitting, by the first antenna module, the first group of antenna channel signals to the user equipment by using the first antenna module;

The local module is configured to send at least one group of antenna channel signals except the first group of antenna channel signals to the at least one evolved remote radio unit through the second antenna module;

If the next stage of the evolved remote radio unit is another evolved remote radio unit, the evolved remote radio unit is configured to receive at least one of the at least one set of antenna channel signals Transmitting the signal to the another evolved remote radio unit; if the next stage of the evolved remote radio unit is the evolved remote module, the evolved remote radio unit is configured to receive the at least Each of the antenna channel signals of the set of antenna channel signals is respectively frequency-converted at different frequency points to obtain at least one set of frequency-converted antenna channel signals, and sent to the evolved remote module;

The evolved remote module is configured to restore a frequency point corresponding to each of the at least one set of the converted antenna channel signals to each of the first group of antenna channel signals At least a set of recovered antenna channel signals are obtained from the frequency of the channel signal and sent to the user equipment;

The user equipment is configured to receive the first group of antenna channel signals sent by the first antenna module, and receive the at least one set of restored antenna channel signals sent by the infinite remote module.

In combination with the fifth aspect, in the first possible implementation manner,

The user equipment is further configured to send an uplink signal to the first antenna module and an evolved remote module;

The evolved remote module is further configured to perform signal synchronization and analog-to-digital conversion processing on the received uplink signal, and convert the processed signal into an in-phase orthogonal IQ data signal, and forward the IQ data signal to the The evolved remote radio unit of the evolved remote module is sent by the evolved remote radio unit;

If the upper stage of the evolved remote radio unit is the second antenna module, the evolved remote radio unit is further configured to send the received IQ data signal to the second antenna module; The upper stage of the remote radio unit is another evolved remote radio unit. The remote radio unit is further configured to send the received IQ data signal to the another evolved remote radio unit until being sent to the second antenna module;

The base station is further configured to receive the uplink signal received by the first antenna module, and receive the IQ data signal that is received by the local module by using the second antenna module.

In combination with the fifth aspect, in a second possible implementation manner,

The evolved remote module is further configured to perform frequency conversion on the uplink signal to obtain a frequency-converted uplink signal, and send the uplink signal to the evolved remote radio unit of the egress of the evolved remote module;

If the upper stage of the evolved remote radio unit is the second antenna module, the evolved remote radio unit is further configured to send the received uplink signal to the second antenna module; The evolved remote radio unit is further configured to send the received uplink signal to the another evolved remote radio unit. Until being sent to the second antenna module;

The local module is further configured to restore a frequency point of the frequency-converted uplink signal received by the second antenna module to a frequency point that is the same as the uplink signal, to obtain a recovered uplink signal, and to the Sending, by the base station, the recovered uplink signal;

The base station is further configured to receive the uplink signal received by the first antenna module, and receive the restored uplink signal sent by the local module.

With reference to any one of the fifth aspect to the second possible implementation of the fifth aspect, in a third possible implementation manner,

The first evolved remote module is further configured to transmit a signal to the second evolved remote module, where the signal includes any one of the converted antenna channel signal, the IQ data signal, and the frequency-converted uplink signal. ;

The first evolved remote module and the second evolved remote module are any two evolved remote modules of the at least one evolved remote module.

In a sixth aspect, a multi-antenna implementation method is provided, the method comprising:

Transforming other antenna channel signals other than the first antenna channel signal of the plurality of antenna channel signals output by the base station to obtain other antenna channel signals after frequency conversion, wherein frequency of each signal in the other antenna channel signals after the frequency conversion Different

Combining the first antenna channel signal with the frequency-converted other antenna channel signals to obtain a combined signal;

Transmitting the combined signal to the user equipment and the at least one remote input multi-output box RMB, so that the other antenna of the combined signal in the combined signal that the RMB of the combined signal will receive is received Recovering a frequency point of at least one of the channel signals to the same frequency point as the first antenna channel signal, obtaining at least one recovered antenna channel signal, and transmitting the at least one restored antenna channel signal to the user The device sends, so that the user equipment acquires the first antenna channel signal in the combined signal, and receives at least one of the at least one restored antenna channel signal sent by the RMB.

With reference to the sixth aspect, in a first possible implementation, the method further includes:

Receiving an uplink signal sent by the user equipment, and receiving an up-converted uplink signal sent by at least one RMB;

Recovering the converted uplink signal to the same frequency point as the uplink signal, and obtaining the restored uplink signal;

Sending the uplink signal and the recovered uplink signal to the base station.

In a seventh aspect, a multi-antenna implementation method is provided, the method comprising:

Performing an inverse fast Fourier transform IFFT or an inverse discrete Fourier transform (IDFT) on the first antenna channel signal of the plurality of antenna channel signals to obtain a discrete first antenna channel signal, and using the antenna other than the first antenna channel signal The channel signal is combined with the first data for IFFT or IDFT to obtain discrete other antenna channel signals;

Modulating the discrete other antenna channel signals to obtain modulated other antenna channel signals;

The modulated first antenna channel signal is buffered and combined with the modulated other antenna channel signals to obtain a combined signal;

Transmitting the combined signal to the user equipment and the at least one of the RMBs, so that the combined signal that the RMB that receives the combined signal will receive, in the modulated other antenna channel signals Demodulating at least one signal to obtain at least one demodulated other antenna channel signal, and performing FFT or DFT on the demodulated other antenna channel signal to remove the first data to obtain at least one other antenna channel signal. Original signal, and then performing IFFT or IDFT on the original signal of the at least one other antenna channel signal to obtain at least one a discrete other antenna channel signal that is the same as a frequency of the discrete first antenna channel signal, and the at least one discrete other antenna channel signal that is the same as the frequency of the discrete first antenna channel signal The user equipment sends, so that the user equipment receives the combined signal sent by a signal transceiver branch, acquires the discrete first antenna channel signal in the combined signal, and receives at least one of the RMB transmissions. The at least one other discrete antenna channel signal that is the same as the frequency of the discrete first antenna channel signal.

In an eighth aspect, another multi-antenna implementation method is provided, the method comprising:

Sending a first set of antenna channel signals to the user equipment;

Transmitting at least one set of antenna channel signals other than the first set of antenna channel signals to the at least one evolved remote radio frequency unit; wherein each set of antenna channel signals comprises at least one of a plurality of antenna channel signals output by the base station Two antenna channel signals, and the number of signals in each group of antenna channel signals is the same;

After the at least one evolved remote radio unit receives the at least one antenna channel signal, if the next stage of the evolved remote radio unit is another evolved remote radio unit, the evolved far end The radio unit transmits at least one of the received at least one set of antenna channel signals to the another evolved remote radio unit; if the next stage of the evolved remote radio unit is the evolution The remote module, the evolved remote radio unit performs frequency conversion of each of the at least one set of the antenna channel signals of the at least one set of antenna channel signals to obtain at least one And converting the antenna channel signal to the evolved remote module, so as to receive the frequency of each of the at least one set of the converted antenna channel signals received by the evolved remote module Point corresponding to recovering to a frequency point of each antenna channel signal of the first group of antenna channel signals, obtaining at least one set of recovered antenna channel signals, and providing the user with the antenna channel signal Preparation transmission, so that the user equipment is configured to receive the first group of antenna channel signal and the antenna signal recovery channel at least one group.

With reference to the eighth aspect, in a first possible implementation, the method further includes:

Receiving an uplink signal sent by the user equipment;

Receiving, by the at least one evolved remote radio unit, an IQ data signal, where the IQ data signal is subjected to signal synchronization and analog-to-digital conversion processing on the uplink signal by the evolved remote module, and converting the processed signal to obtain And sent to the evolved remote radio unit of.

With reference to the eighth aspect, in a second possible implementation manner, the method further includes:

Receiving an uplink signal sent by the user equipment;

Receiving, by the at least one evolved remote radio unit, the frequency-converted uplink signal, where the converted uplink signal is generated by the evolved remote module, and sent to the evolved remote end Radio frequency unit

The frequency point of the received up-converted uplink signal is restored to the same frequency point as the uplink signal, and the recovered uplink signal is obtained.

In summary, the embodiments of the present invention provide a multi-antenna implementation method, apparatus, and system. In an indoor multi-antenna system, an antenna channel other than the first antenna channel signal is outputted by the LMU through multiple antenna channel signals output by the base station. The signal is frequency-converted at different frequency points, and then the first antenna channel signal is combined with the frequency-converted other antenna channel signals, and the obtained combined signal is simultaneously sent to the UE and the RMB, wherein the RMB is converted after the frequency conversion. The frequency point of at least one of the other antenna channel signals is restored to the original frequency point and is also sent to the UE, so that the UE can simultaneously receive the first antenna channel signal in the combined signal, and the frequency point recovery of the at least one signal. In the outdoor multi-antenna system, a group of antenna channel signals are sent to the UE through the first antenna module, and the other group antenna channel signals are transmitted to the evolved remote radio unit through the second antenna module, and the remote radio unit is evolved. The other antenna channel signals are frequency-converted and transmitted to the evolved remote module, and the other remote antenna channels are converted by the evolved remote module. After re-conversion to restore the original frequency, and sends the UE, so that the UE can simultaneously receive multiple sets of antenna channel signal. It can be seen that multi-antenna technology can be implemented without increasing antenna deployment, thereby improving system performance without increasing cost.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic diagram of downlink transmission of an indoor multi-antenna system according to an embodiment of the present invention;

2 is a schematic diagram of uplink transmission of an indoor multi-antenna system according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an LMU according to an embodiment of the present disclosure;

4 is another schematic structural diagram of an LMU according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an RMB according to an embodiment of the present disclosure;

FIG. 6 is another schematic structural diagram of an RMB according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of utilizing discrete spectrum transmission of an indoor multi-antenna system according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of downlink transmission of an outdoor multi-antenna system according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic diagram of uplink transmission of an outdoor multi-antenna system according to an embodiment of the present invention; FIG.

FIG. 10 is another schematic diagram of uplink transmission of an outdoor multi-antenna system according to an embodiment of the present disclosure;

FIG. 11 is a schematic flowchart diagram of a method for implementing multiple antennas according to an embodiment of the present invention;

FIG. 12 is a schematic flowchart of downlink transmission of a multi-antenna implementation method according to an embodiment of the present disclosure;

FIG. 13 is a schematic flowchart of uplink transmission of a multi-antenna implementation method according to an embodiment of the present disclosure;

FIG. 14 is a schematic flowchart diagram of another multi-antenna implementation method according to an embodiment of the present invention;

FIG. 15 is a schematic flowchart diagram of still another method for implementing multiple antennas according to an embodiment of the present invention;

FIG. 16 is a schematic flowchart of downlink transmission of another multi-antenna implementation method according to an embodiment of the present disclosure;

FIG. 17 is a schematic flowchart of uplink transmission of another multi-antenna implementation method according to an embodiment of the present disclosure;

FIG. 18 is a schematic flowchart of uplink transmission of another multi-antenna implementation method according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. Based on the embodiments of the present invention, one of ordinary skill in the art does not create All other embodiments obtained under the premise of sexual labor are within the scope of protection of the present invention.

An embodiment of the present invention provides an indoor multi-antenna system. As shown in FIG. 1 , the indoor multi-antenna system includes:

a base station, a local MIMO unit (LMU), a combining unit, a feeder, at least one signal transmitting and receiving branch connected to the feeder, and at least one remote input MIMO box (Remote MIMO Box, Hereinafter referred to as: RMB). The indoor multi-antenna system can serve a plurality of user equipments (User Equipments, hereinafter referred to as UEs) located within the signal range of the system.

Wherein, for downlink transmission, the base station outputs multiple antenna channel signals.

The LMU is configured to frequency-convert other antenna channel signals other than the first antenna channel signal of the plurality of antenna channel signals to obtain other antenna channel signals after the frequency conversion, wherein each of the other antenna channel signals after the frequency conversion has different frequency points.

The combining unit is configured to combine the first antenna channel signal with the converted other antenna channel signals to obtain a combined signal; the combined signal is transmitted to the at least one signal transmitting and receiving branch through the feeder, and is to the user equipment and the at least one RMB Send a combined signal.

The RMB is used to restore the frequency of at least one of the converted other antenna channel signals to the same frequency as the first antenna channel signal, to obtain at least one restored antenna channel signal, and Sending at least one recovered antenna channel signal to the user equipment.

The UE is configured to receive a combined signal sent by a signal transmitting and receiving branch, acquire a first antenna channel signal in the combined signal, and receive at least one restored antenna channel signal sent by at least one RMB.

Exemplarily, the plurality of antenna channel signals output by the base station are antenna channel signals 0 to 3, respectively, as shown in FIG. 1, and are respectively recorded as p0 to p3. The p0 to p3 may be an LTE radio frequency signal, and the optional p0 to p3 may further include at least one of a reference clock signal, a preset synchronization signal, and an operation and maintenance signal provided by the base station. The reference clock signal may be a signal with a frequency of 10 MHz or a signal with a frequency of 122.88 MHz (of course, it may also be a signal of other frequencies). If a Time Division Duplexing (TDD) is used, the preset synchronization is performed. The signal can be a control signal for TDD transceiving switching. Operation and maintenance signals include device switching signals (for switching RMB), gain control signals, delay control signals, and phase adjustment signals. At least one of them.

For the multiple antenna channel signals p0 to p3 provided by the base station, in addition to p0, the LMU frequency-converts p1 to p3, and the frequency after the frequency conversion may be 5.2 GHz or 3.5 GHz, or other frequencies than the original frequency point. The frequency of p1 to p3 after frequency conversion is different, and the purpose is to prevent interference from each other when p0 to p1 are transmitted through the same feeder.

Then, the combining unit combines p0 and the converted p1 to p3 (the combined way refers to combining the multiple signals into one channel for transmission), and the combining unit can be a combiner or a duplexer. Specific can be used:

For example, the LMU is provided with another built-in combiner. The built-in combiner can first combine and output p1~p3, and then combine the combined unit and p0 to obtain a combined signal; or the LMU directly P1 to p3 are input to the combining unit and combined to obtain a combined signal.

The combination signal includes at least p0 and the converted p1 to p3. Optionally, when the base station further provides at least one of a reference clock signal, a preset synchronization signal, and an operation and maintenance signal, the combination signal further includes a reference. At least one of a clock signal, a preset synchronization signal, and an operation and maintenance signal.

Optionally, the combining unit may be built in the LMU or externally connected to the LMU, and the LMU may be built in the base station or externally connected to the base station, where the base station may be an eNB, including an RRU and a BBU. In Figure 1, the LMU is external to the base station, and the combining unit is external to the LMU. Other possible implementations are not shown.

After the combined unit obtains the combined signal, the combined unit sends the combined unit to each signal transmitting and receiving branch through the feeding line. The structure of the signal transmitting and receiving branch can be as shown in FIG. 1 (signal transmitting and receiving branches 1 to 3 shown in FIG. 1), including : coupler, splitter, at least one antenna, the input end of the coupler is connected to the feeder, the output of the coupler is connected to the input of the splitter, and the output of the splitter is connected to each antenna (Fig. 1 The number of antennas connected to the power splitter shown is two or three).

Each of the signal transmission and reception branches is generally located in a different area, such as in a building, and each of the layers is provided with one of the above signal transmission and reception branches. After the combined signal is distributed by the coupler connected to the feeder, the combined signal is transmitted to the splitter on each signal receiving and dispatching branch, and the splitter further distributes the transmit power (generally equal power) for each antenna. Finally, the combined signal is sent out by radiating outward.

The RMB and the UE in the signal coverage sent by the signal transmitting and receiving branch can receive the combined signal. After receiving the combined signal, the UE can only recognize the combined path because p1 to p3 are converted in the combined signal. P0 in the signal.

At the same time, after the RMB receives the combined signal, at least one of p1 to p3 in the combined signal is further frequency-converted, so that the frequency of at least one of the signals p1 to p3 is restored to the same frequency as p0, that is, p1 ~p3 At least one signal is restored to the original frequency. Each of the RMBs shown in FIG. 1 recovers one of the signals p1 to p3, wherein the RAM1 covered by the top-to-bottom signal transmission and reception branch 1 recovers the frequency of p1, and the signal transmission and reception branch 2 covers the The recovery of RMB2 is also the frequency of p1. The three RMB1~3 covered by the signal transmission and reception branch 3 recover the frequency points of p1, p2 and p3 respectively. Of course, the above is only an example, and each of the RMB can recover several signals. Can be achieved by configuring RMB.

Then, the RMB transmits the recovered at least one signal to the UE. At this time, the UE can receive both p0 and at least one of p1 to p3 sent by the RMB. As shown in FIG. 1, the signal transmission and reception branch 1 The UE1 under the coverage receives p0 and p1 at the same time, and the UE2 covered by the signal transmission and reception branch 2 receives p0 and p1 at the same time, and the UE3 covered by the signal transmission and reception branch 3 simultaneously receives p0 to p3. It can be seen that through the wireless transmission mode, MIMO is realized in the downlink transmission of the indoor system, and the system performance is improved.

The deployment of RMB can be determined according to needs, and can generally be deployed in an area with more UEs, so that MIMO can be implemented in the area. Therefore, dynamic deployment can be performed according to the performance requirements of different regions.

Second, for uplink transmission, it may include:

The UE is configured to send an uplink signal to a signal transceiver branch and at least one RMB;

RMB is used for receiving the uplink signal, and frequency-converting the received uplink signal to obtain an up-converted uplink signal, and transmitting the frequency-converted uplink signal to a signal transmitting and receiving branch;

A signal transmitting and receiving branch is used for receiving the uplink signal and the converted uplink signal, and transmitting the uplink signal and the converted uplink signal as one signal to the LMU through the feeder;

The LMU is configured to restore the up-converted uplink signal to the same frequency as the uplink signal, obtain the recovered uplink signal, and transmit the uplink signal and the recovered uplink signal to the base station.

Exemplarily, as shown in FIG. 2, UE1 sends out an uplink signal, denoted as p, the signal range covers the signal transmission and reception branch 1 of the UE1, and the signal range of the signal transmission and reception branch 1. The internal RMB1 can receive the uplink signal.

After receiving p, RMB1 converts p, and the frequency after the frequency conversion can be 5.2GHz or 3.5GHz, or the frequency other than the original frequency point, the frequency signal p' after the frequency conversion is obtained, and p' Send outside. The reference clock signal may also be the same as the reference clock signal in the river channel acquired by the UE1 from the base station during downlink transmission.

After the signal transmission/reception branch 1 acquires the frequency-converted uplink signal p', it transmits p' and the received one-way signal to the LMU.

After acquiring the signal, the LMU sends the p in the signal to the base station, and p' is again frequency-converted to obtain p", so that the frequency of p" is the same as p (which can be understood as p" is to restore p' Go back to p) and then p" to the base station. Therefore, the base station can receive the uplink signals p and p". It can be seen that, by means of wireless transmission, MIMO is also implemented in the uplink transmission of the indoor system, thereby improving system performance.

In addition, the LMU structure provided by the embodiment of the present invention may be as shown in FIG. 3, and includes:

At least one downlink transmission unit 1, the downlink transmission unit includes: a first frequency converter 101, a first filter 102, a first power amplification module 103, and a first duplexer 104;

The signal of any antenna channel of the base station is input from the first input end of the first frequency converter 101, and the output end of the first frequency converter 101 is connected to the input end of the first filter 103, and the output end of the first filter 102 Connected to the input end of the first power amplifying module 103, the output end of the first power amplifying module 103 is connected to the input end of the first duplexer 104, and the output end of the first duplexer 104 is connected to the feeder in the indoor multi-antenna system. .

The downlink transmission unit 1 can perform frequency conversion on one antenna channel signal. Therefore, when the LMU sets multiple downlink transmission units 1, the multiple antenna channel signals can be simultaneously converted.

Optionally, the downlink transmission unit 1 may further include: a second filter 105, a power divider 106, a second power amplification module 107, and a first phase locked loop 108;

The input end of the second filter 105 is used to input the reference clock signal, the output end of the second filter 105 is connected to the input end of the power splitter 106, and the first output end of the power splitter 106 is connected to the first phase-locked loop. 108 input end, the output end of the first phase locked loop 108 is connected to the second input end of the first frequency converter 101, and the second output end of the power splitter 106 is connected to the input of the second power amplifying module 107 The first duplexer 104 connected to the output of the second power amplifying module 107;

The aforementioned preset synchronization signal and operation and maintenance signal are connected to the first duplexer 104.

The first power amplifying module may be composed of a gain adjustable power amplifier and a power amplifier (large gain), and the second power amplifying module may also be a power amplifier.

Optionally, as shown in FIG. 4, the LMU may further include at least one uplink transmission unit 2, where the uplink transmission unit 2 includes: a second duplexer 201, a third power amplification module 202, and a fourth power amplification module 203. Two frequency converter 204, third filter 205, fifth power amplification module 206;

The input end of the second duplexer 201 is connected to the feeder in the indoor multi-antenna system, and the first output end of the second duplexer 201 is connected to the input end of the third power amplifying module 202, and the output of the third power amplifying module 202 is output. The second output end of the second duplexer 201 is connected to the input end of the fourth power amplifying module 203, and the output end of the fourth power amplifying module 203 is connected to the first end of the second frequency converter 204. The input end of the second frequency converter 204 is connected to the input end of the third filter 205, the output end of the third filter 205 is connected to the output end of the fifth power amplifying module 206, and the output end of the fifth power amplifying module 206 is connected. Base station.

Optionally, the uplink transmission unit 2 further includes: a sixth power amplification module 207 and a second phase locked loop 208;

The input end of the sixth power amplifier 207 is used to input the reference clock signal, the output end of the sixth power amplifier 207 is connected to the input end of the second phase locked loop 208, and the output end of the second phase locked loop 208 is connected to the second frequency converter. The second input of 204.

The third, fourth, fifth, and sixth power amplification modules may be power amplifiers.

As shown in FIG. 5, the structure of the RMB provided by the embodiment of the present invention includes: at least one downlink transmission unit 3, a first antenna 00, and a second antenna 01. The downlink transmission unit 3 includes: a first duplexer 301, and a first power. The amplification module 302, the first frequency converter 303, the first filter 304, and the second power amplification module 305;

The first antenna 00 is connected to the input end of the first duplexer 301, the first output end of the first duplexer 301 is connected to the input end of the first power amplifier 302, and the output end of the first power amplifying module 302 is connected to the first end. The first input end of the frequency converter 303, the output end of the first frequency converter 303 is connected to the input end of the first filter 304, and the output end of the first filter 304 is connected to the second power amplification. At the input of the module 305, the output of the second power amplifying module 305 is connected to the second antenna 01.

The downlink transmission unit 3 can perform frequency conversion recovery on one antenna channel signal. Therefore, when the plurality of downlink transmission units 3 are set by the RMB, the multiple antenna channel signals can be simultaneously restored by frequency conversion.

Optionally, the downlink transmission unit 3 may further include: a third power amplification module 306, a first phase locked loop 307;

The second output end of the first duplexer 301 is connected to the input end of the third power amplifying module 306, and the second output end of the first duplexer 301 is used to output the received reference clock signal, and the third power amplifying module The output end of the first phase-locked loop 307 is connected to the input end of the first phase-locked loop 307, and the output end of the first phase-locked loop 307 is connected to the second input end of the first frequency converter 303.

The first power amplification module and the third power amplification module may be a power amplifier, and the second power amplification module is composed of a gain adjustable power amplifier and a power amplifier connected in series.

Optionally, as shown in FIG. 6, the RMB may further include:

The at least one uplink transmission unit 4, the uplink transmission unit 4 includes: a second filter 401, a fourth power amplification module 402, a second frequency converter 403, a third filter 404, and a fifth power amplification module 405;

The first antenna 00 is connected to the input end of the second filter 401, the output end of the second filter 401 is connected to the input end of the fourth power amplifying module 402, and the output end of the fourth power amplifying module 402 is connected to the second inverter 403. The first input end, the output end of the second frequency converter 403 is connected to the input end of the third filter 404, the output end of the third filter 404 is connected to the input end of the fifth power amplifier 405, and the output end of the fifth power amplifier 405 The second antenna 01 is connected.

Optionally, the uplink transmission unit 4 further includes: a fourth filter 406, a power divider 407, and a second phase locked loop 408;

The input end of the fourth filter 406 is used to input the reference clock signal, the output end of the fourth filter 406 is connected to the input end of the splitter 407, and the output end of the splitter 407 is connected to the input of the second phase locked loop 408. The output end of the second phase locked loop 408 is connected to the second input end of the second frequency converter 403.

The fourth power amplifying module is a power amplifier, for example, may be a low noise power amplifier, and the fifth power amplifying module is a power amplifier, which may be a gain adjustable power amplifier. It is composed in series with a power amplifier.

Optionally, the RMB may adjust the downlink transmission characteristic parameter of the RMB according to the foregoing operation and maintenance signal, where the transmission characteristic parameter of the downlink includes at least one of an amplification gain, a delay parameter, and a phase parameter.

Optionally, the RMB may further adjust the downlink transmission characteristic parameter of the RMB according to the received combined signal or according to an uplink signal sent by the UE (for example, according to a signal strength, a delay, and the like of the uplink signal). . The transmission characteristic parameter of the downlink includes at least one of an amplification gain, a delay parameter, and a phase parameter.

Optionally, the base station may further adjust the downlink transmission characteristic parameter of the RMB according to the uplink signal sent by the user equipment or the channel status indication sent by the user equipment, where the transmission characteristic parameter of the downlink includes the amplification gain and the time. At least one of a delay parameter and a phase parameter.

Exemplarily, the above adjustment of the amplification gain can be implemented by configuring a power amplifier with adjustable gain, or by configuring a numerically controlled adjustable attenuator (not shown); adjusting the delay and phase can be configured by configuring a numerically controlled delay line. The phase shifter is implemented by a method such as buffer delay transmission (not shown in the figure).

Optionally, during initialization, the base station may further adjust parameters of the signals transmitted by the multiple antenna channels of the base station according to the initial transmission characteristic parameter of the downlink of the RMB, so that the antenna channel signals transmitted by the multiple antenna channels are The error of the parameter is within the preset range;

Optionally, the UE may also obtain measurement results according to all antenna channel signals that the user equipment can receive, and send the measurement result to the base station. The measurement results include, but are not limited to, a signal to noise ratio of each antenna channel signal that can be received.

The base station may use the proportional fairness criterion to schedule time-frequency resources for the user equipment according to the measurement result, the data scheduled by the user equipment, and the current data transmission rate of the user equipment.

In addition, optionally, the signal converted by the antenna channel signal is a continuous spectrum signal, and may be a discrete spectrum signal, as shown in FIG. At least one Inverse Fast Fourier Transform (IFFT) module or an Inverse Discrete Fourier Transform (IDFT) module is set in the base station in the antenna system (which can be set in the BBU). And buffer (can be set in the BBU and / or RRU), the transmit channel module is correspondingly set for each signal; the demodulation module, the Fast Fourier Transform (FFT) module or the discrete is set in the RMB A Fourier Transform (DFT) module, an IFFT module or an IDFT module, and a transmission channel module, and the processing methods include:

First, the IFFT module in the BBU performs IFFT or IDFT on the first antenna channel signal of the plurality of antenna channel signals output by the base station to obtain a discrete first antenna channel signal, and the first antenna channel signal and other antenna channel signals are first. Data (for example, data "0" can be combined for IFFT or IDFT) to obtain discrete other antenna channel signals;

Second, the LMU modulates the discrete other antenna channel signals (which can be modulated to 3.5 GHz or other possible frequencies) to obtain modulated other antenna channel signals;

At the same time, the modulated first antenna channel signal is input into the buffer, and is buffered into the transmission channel module (where the modulated first antenna channel signal input buffer is used to enable the signal to be sent to the UE and the signal sent to the UE by the RMB) Synchronizing in time), and transmitting the modulated other antenna channel signals to the combining unit through the transmitting channel module, the combining unit combining the first antenna channel signal with the modulated other antenna channel signals , get the combined signal;

The combining unit sends the combined signal to the respective signal transmitting and receiving branches through the feeder, and is configured to send the combined signal to the user equipment and the at least one RMB;

Receiving, by the RMB, the combined signal, at least one of the modulated other antenna channel signals in the combined signal is demodulated by a synchronization module to obtain at least one demodulated other antenna The channel signal is subjected to FFT or DFT processing on the demodulated other antenna channel signals by the FFT module or the DFT module to obtain an original signal of at least one other antenna channel signal, and finally, other antenna channels obtained by the IFFT module or the IDFT module are obtained. The original signal of the signal is subjected to IFFT or IDFT processing to obtain discrete other antenna channel signals having the same frequency as the discrete first antenna channel signal (notably, since the aforementioned discrete other antenna channel signals are combined with the first data Do IFFT or IDFT, so it is different from the discrete other antenna channel signals obtained here).

Then, the RMB transmits the obtained discrete antenna channel signals to the UE.

In this way, the UE simultaneously receives the discrete first antenna channel signal and the discrete other antenna channel signals. Since the discrete first antenna channel signal is processed by the buffer before transmission, the UE discrete first antenna channel signal and discrete Other antenna channel signals are synchronized in time.

Exemplarily, as shown in FIG. 7, it is assumed that a plurality of antenna channel signals output by a base station (which may be an eNB) are antenna channel signals 0 to 3, respectively, which are denoted as p0 to p3, and corresponding to p0 to p3 in the BBU of the base station. There are 4 IFFT modules, which are IFFT modules 0 to 3. In the BBU and RRU, buffers are set for p0. In the RRU, there are 4 transmission channels corresponding to p0 to p3, which are transmission channels 0 to 3. The LMU can be externally connected to the base station. It can also be built in the base station. Here, the built-in base station is taken as an example (shown in FIG. 7 and built in the RRU). In addition, the above IFFT module can be replaced with an IDFT module, and the FFT module can be replaced with a DFT module.

The p0 is subjected to IFFT processing by the IFFT module 0 to obtain a discrete spectrum signal p0'.

P1 to p3 and data "0" are subjected to IFFT processing by IFFT modules 1 to 3, respectively, to obtain discrete spectrum signals p1" to p3".

P0' is input to the buffer of the BBU, and is input to the transmission channel 0 through the buffer of the RRU.

P1" to p3" are input to the transmission channels 1 to 3, respectively.

Each of the input channels respectively combines the above p0', p1"~p3" through a combining unit (which may be a duplexer) to obtain a combined signal, and transmits the combined signal to the signal transmitting and receiving branch through the feeding line. .

After receiving the combined signal, the RMB processes at least one of p1"~p3" in the combined signal. If two or more signals in p1"~p3" are to be processed simultaneously, it is necessary to have at least two sets of RMB. The following modules: demodulation module, FFT module, IFFT module, transmission channel module. This assumes that RMB only processes p1", then:

The RMB demodulates p1" by the demodulation module to obtain the demodulated p1"', and then FFTs the p1"' by the FFT module, removes the data "0", and obtains the original data p1 of p1"', and finally P1 is subjected to IFFT processing by the IFFT module to obtain p1' of the same frequency point as p0'.

Finally, the RMB transmits p1' to the UE, at which time the UE simultaneously receives p0' in the combined signal and p1' transmitted from the RMB. The storage time of p0' in the cache of the BBU and the RRU may be determined according to actual conditions, such as the processing time of the reference RMB, and other possible delay synthesis. Depending on the consideration, p0' and p1' received by the UE are synchronized in time. It can be seen that through another wireless transmission mode, MIMO is also implemented in the uplink transmission of the indoor system, thereby improving system performance.

In summary, the indoor multi-antenna system provided by the embodiment of the present invention performs frequency conversion of different antenna channels other than the first antenna channel signal of the plurality of antenna channel signals output by the base station through the LMU during downlink transmission. And combining the first antenna channel signal with the frequency-converted other antenna channel signals, and simultaneously transmitting the obtained combined signal to the UE and the RMB, wherein the RMB is in the other antenna channel signals after the frequency conversion After the frequency of the at least one signal is restored to the original frequency, the UE is also sent to the UE, so that the UE can simultaneously receive the first antenna channel signal in the combined signal and the recovery signal of the frequency recovery of the at least one signal, thereby The method implements MIMO in downlink transmission; in uplink transmission, the UE simultaneously sends an uplink signal to the signal transmission and reception branch and the RMB, and then the RMB transmits the frequency-converted uplink signal to the signal transmission and reception branch, and the LMU further converts the uplink signal after the frequency conversion. After returning to the original frequency point, the recovery signal and the received uplink signal are sent to the base station, thereby implementing the M in the uplink mode by wireless. IMO can be seen to enable multi-antenna technology without increasing antenna deployment, thereby improving system performance without increasing cost.

An embodiment of the present invention provides an outdoor multi-antenna system. As shown in FIG. 8, the outdoor multi-antenna system includes:

a base station, a local module (hereinafter referred to as LM), a first antenna module, a second antenna module, at least one evolved remote radio unit (advanced RRU, hereinafter referred to as aRRU), and at least one evolved remote module (advanced remote module) Hereinafter referred to as: aRM);

For downlink transmission, the base station outputs multiple antenna channel signals, and at least two antenna channel signals are grouped, and the number of signals in each group of antenna channel signals is the same;

Transmitting, by the first antenna module, the first group of antenna channel signals to the UE by using the first antenna module;

The LM is configured to send at least one group of antenna channel signals except the first group of antenna channel signals to the at least one aRRU through the second antenna module;

If the next level of the aRRU is another aRRU, the aRRU is configured to send at least one of the received at least one set of antenna channel signals to another aRRU; if the next level of the aRRU is aRM, the aRRU is used At least one of the at least one set of antenna channel signals to be received Each antenna channel signal of a group of antenna channel signals is respectively frequency-converted at different frequency points to obtain at least one group of frequency-converted antenna channel signals, and is sent to the aRM;

The aRM is configured to restore a frequency point corresponding to each of the received at least one set of the converted antenna channel signals to a frequency point of each antenna channel signal of the first group of antenna channel signals, to obtain at least one The restored antenna channel signal is sent to the UE;

The UE is configured to receive the first group of antenna channel signals sent by the first antenna module, and receive at least one group of the restored antenna channel signals sent by the aRM.

For example, as shown in FIG. 8 , since the antenna modules of the outdoor multi-antenna system mostly use dual antennas, the first antenna module and the second antenna module in this embodiment are also dual antennas, and multiple antenna channels of the base station are transmitted. The antenna channel signal can be grouped by two signals. For example, if the antenna channel signal of the base station has p0, p1, p2, p3, p2', p3', p2", p3", it can be divided into p0/p1, p2. Four groups of /p3, p2'/p3', p2"/p3" ("/" means "and"), wherein the signals of each group may be the same signal or different signals.

The foregoing base station may be an eNB, including: a BBU, an RRU, a BBU, and an RRU, where the LM and the BBU are connected. P0/p1 is directly transmitted by the RRU to the UE through the first antenna module (hereinafter, UE1 is taken as an example), and p2/p3, p2'/p3', p2"/p3" are transmitted by the LM to the aRRU through the second antenna module. The data transmission between the LM and the aRRU can be implemented digitally through a Common Public Radio Interface (CPRI).

As shown in FIG. 8, aRRU0 transmits at least one of p2/p3, p2'/p3', p2"/p3" to aRRU1 of the lower stage after receiving p2/p3, p2'/p3', p2"/p3". The exemplary aRRU0 in Figure 8 sends p2/p3, p2'/p3' to aRRU1. Among them, the data transmission between aRRU can also be realized digitally through CPRI.

After aRRU1 is received, at least one of p2/p3 and p2'/p3', such as p2'/p3', is frequency-converted at different frequencies, that is, p2' becomes a frequency point, and p3' becomes another frequency. point. The converted p2'/p3' is then sent to aRM1. Among them, the data transmission between aRRU and aRM can be through the air interface.

After aRM1 receives p2'/p3', it converts p2'/p3' again, restores the frequency of p2' to the same frequency as p0, and restores the frequency of p3' to the same frequency as p1, and then Then send the restored p2'/p3' to UE1, at this time UE1 can receive p0/p1 and P2'/p3'. Wherein, the reference clock signal may also be introduced when the frequency conversion is performed, and the signal is provided by the base station and sent together with the antenna channel signal, or the signal may be a GPS signal.

Of course, by configuring the aRRU, UE1 can also receive p0/p1, p2/p3, p2'/p3', p2"/p3", and the base station transmits p0/p1, p2/p3, p2'/p3', P2"/p3" is merely exemplary. The base station may also send more groups of signals, and the UE can also receive more groups of signals at the same time. It can be seen that the antenna channel can be increased in a large amount without increasing the number of antennas. The signal realizes massive MIMO of downlink transmission by means of wireless, and improves system performance.

In addition, it is worth mentioning that if aRM1 cannot obtain a signal from the aRRU for some reason, the aRRU can send the signal to aRM0 first and aRM0 to aRM1. Among them, the data transmission between aRM can be realized in an analog manner through the air interface. Moreover, in another possible implementation manner, the aRM may also be directly connected to the LM through the second antenna module, and the transmission method is similar to the downlink transmission method of the RMB connected to the LMU in the foregoing embodiment.

For upstream transmissions, include:

The UE is further configured to send an uplink signal to the first antenna module and an aRM;

The aRM is further configured to perform signal synchronization and analog-to-digital conversion processing on the received uplink signal, and convert the processed signal into an IQ data signal, and send the IQ data signal to the aRRU of the upper aRM;

If the upper stage of the aRRU is the second antenna module, the aRRU is further configured to send the received IQ data signal to the second antenna module; if the upper level of the aRRU is another aRRU, the aRRU is further used to send the received IQ data signal to another An aRRU is sent until it is sent to the second antenna module;

The base station is further configured to receive an uplink signal received by the first antenna module, and receive an IQ data signal that is received by the local module by using the second antenna module.

Illustrative, as shown in Figure 9:

UE1 sends an uplink signal to aRM1 of the upper level, which is assumed to be p.

aRM1 performs signal synchronization and analog-to-digital conversion processing on the received p, and converts the processed signal into an in-phase (Quadrature, hereinafter referred to as: IQ) data signal, and passes the IQ data signal through the upper level of aRM1. At least one aRRU is sent to the second antenna module. For example, in FIG. 8, aRM1 sends an IQ data signal to the transmitting aRRU1, and aRRU1 sends an IQ to aRRU0. The data signal, aRRU0 sends an IQ data signal to the second antenna module, the second antenna module transmits the IQ data signal to the LM, and the LM transmits the IQ data signal to the BBU of the base station, and the first antenna module passes the received uplink signal p. The RRU is transmitted to the BBU. It can be seen that the BBU of the base station simultaneously receives the two sets of signals of the IQ data signal and the uplink signal p.

Alternatively, the uplink transmission can include:

The aRM is also used to frequency-convert the uplink signal to obtain the up-converted uplink signal, and send it to the aRRU of the upper aRM;

If the upper stage of the aRRU is the second antenna module, the aRRU is further configured to send the received up-converted uplink signal to the second antenna module; if the upper level of the aRRU is another aRRU, the aRRU is also used to receive the received frequency conversion. The uplink signal is sent to another aRRU until it is sent to the second antenna module;

The LM is further configured to restore the frequency point of the frequency-converted uplink signal received by the second antenna module to the same frequency point as the uplink signal, obtain the recovered uplink signal, and send the restored uplink signal to the base station;

The base station is further configured to receive an uplink signal received by the first antenna module, and receive the restored uplink signal sent by the LM.

Exemplarily, as shown in FIG. 10, UE1 is still taken as an example, and UE1 sends an uplink signal to aRM1 of the upper level, which is assumed to be p.

After receiving the p, the aRM1 converts p to obtain p', and then transmits the converted p' to the second antenna module through at least one aRRU. As shown in FIG. 9, aRM1 sends the converted p', aRRU1 to aRRU1. After transmitting the converted p' to aRRU0, aRRU0 sends the converted p' to the second antenna module.

After receiving the converted p', the second antenna module sends the converted p' to the LM, and the LM converts the converted p' to the frequency, and restores the frequency of the converted p' to the same frequency as p. Point to get p" (which can be understood as p) is to restore p' back to p,), and then send the recovered p" to the base station, at which time the base station receives both p and recovered p" signals.

Optionally, in another possible implementation manner, the aRM may also be directly connected to the LM through the second antenna module, and the transmission method is similar to the uplink transmission method of the RMB connected to the LMU in the foregoing embodiment.

In this embodiment, the LM may be built in the base station or externally connected to the base station, and FIG. 8, FIG. 9, and FIG. 10 are built in the base station.

It can be seen that, in the downlink transmission, the base station can receive two signals at the same time. Of course, the foregoing is merely exemplary. Since the outdoor system may serve many UEs, the base station may also receive more groups by the above method. The signal can be seen that, without increasing the number of antennas, the antenna channel signal can be greatly increased, and the large-scale MIMO of the uplink transmission is realized by the wireless method, thereby improving the system performance.

In summary, the outdoor multi-antenna system provided by the embodiment of the present invention transmits a set of antenna channel signals to the UE through the first antenna module in the downlink transmission, and transmits the signals of the other group antenna channels to the UE through the second antenna module. aRRU, aRRU converts the other groups of antenna channel signals to aRM, re-converts the other groups of antenna channel signals after amplification, restores the original frequency points, and sends them to the UE, so that the UE can receive multiple sets of antennas at the same time. The channel signal is used to implement large-scale MIMO in the downlink mode. In the uplink transmission, the first antenna module receives the uplink signal sent by the UE, and sends the uplink signal to the base station, and the aRM receives the transmitted uplink signal to perform the uplink signal. The series is processed and sent to the aRRU, which is sent by the aRRU to the second antenna module, and is sent to the base station, so that the base station can receive multiple sets of antenna channel signals at the same time, thereby implementing large-scale MIMO in the uplink transmission in a wireless manner. Multi-antenna technology without increasing antenna deployment, enabling cost without increasing costs Under conditions to improve system performance.

An embodiment of the present invention provides a multi-antenna implementation method, which can be applied to the foregoing indoor multi-antenna system. As shown in FIG. 11, the method includes:

S101. Perform frequency conversion on other antenna channel signals other than the first antenna channel signal of the plurality of antenna channel signals output by the base station, to obtain other antenna channel signals after frequency conversion, wherein frequency of each signal in the other antenna channel signals after frequency conversion different.

S102: Combine the first antenna channel signal with the other antenna channel signals after the frequency conversion to obtain a combined signal.

S103. Send a combined signal to the UE and the at least one remote input multiple output box RMB, so that the frequency at least one of the converted other antenna channel signals in the received combined signal of the received combined signal of the RMB is received. Recovering to the same frequency as the first antenna channel signal, obtaining at least one recovered antenna channel signal, and at least one restored antenna The channel signal is sent to the UE, so that the UE acquires the first antenna channel signal in the combined signal and receives at least one restored antenna channel signal sent by the at least one RMB.

The multi-antenna implementation method provided by the embodiment of the present invention uses the LMU to perform frequency conversion of different antenna channels other than the first antenna channel signal of the plurality of antenna channel signals output by the base station, and then converts the first antenna channel signal and the frequency conversion. After the other antenna channel signals are combined, the combined combined signals are simultaneously sent to the UE and the RMB, wherein the RMB transmits the frequency of at least one of the other antenna channel signals after the frequency conversion is restored to the original frequency point. Up to the UE, enabling the UE to simultaneously receive the first antenna channel signal in the combined signal and the recovery signal of the frequency point recovery of the at least one signal, thereby implementing MIMO in a wireless manner, which can be seen without increasing the antenna deployment. Implement multi-antenna technology to improve system performance without increasing costs.

In order to enable a person skilled in the art to more clearly understand the technical solutions provided by the embodiments of the present invention, the multi-antenna implementation method provided by the embodiments of the present invention is described in detail below by way of specific embodiments. The indoor multi-antenna system includes: a base station, an LMU, a combining unit, a feeder, at least one signal transmitting and receiving branch connected to the feeder, and at least one RMB.

In the downlink transmission, as shown in FIG. 12, the method includes:

S201. The LMU frequency-converts other antenna channel signals other than the first antenna channel signal of the plurality of antenna channel signals output by the base station, and obtains other antenna channel signals after the frequency conversion, wherein the frequency of each of the other antenna channel signals after the frequency conversion is converted. The point is different.

S202: The combining unit combines the first antenna channel signal with the converted other antenna channel signals to obtain a combined signal.

S203. The signal transceiving branch sends a combined signal to the UE and the at least one remote input multi-output box RMB.

S204. The RMB restores a frequency point of at least one of the converted other antenna channel signals in the received combined signal to the same frequency as the first antenna channel signal, to obtain at least one restored antenna channel signal.

S205. The RMB sends at least one recovered antenna channel signal to the UE.

S206. The UE acquires a first antenna channel signal in the combined signal, and receives at least one restored antenna channel signal sent by the at least one RMB.

The specific method of the foregoing steps, the structure of each unit performing the above steps, and the connection relationship of each unit are completely the same as those in the indoor antenna system shown in FIG. 1, and specifically, the foregoing system shown in FIG. The content of this will not be repeated.

In the uplink transmission, as shown in FIG. 13, the method includes:

S207. The signal transceiver branch receives the uplink signal sent by the UE, and receives the frequency-converted uplink signal sent by the at least one RMB.

S208. The LMU restores the frequency-converted uplink signal to the same frequency as the uplink signal, and obtains the restored uplink signal.

S209. The LMU sends an uplink signal and a recovered uplink signal to the base station.

The specific method of each step, the structure of each unit performing the above steps, and the connection relationship of each unit are completely the same as those in the indoor antenna system shown in FIG. 2, and specifically refer to the foregoing system shown in FIG. 2. The content of this will not be repeated.

In summary, the multi-antenna implementation method provided by the embodiment of the present invention performs frequency conversion of different antenna channel signals other than the first antenna channel signal of multiple antenna channel signals output by the base station through the LMU during downlink transmission. And combining the first antenna channel signal with the converted other antenna channel signals, and simultaneously transmitting the obtained combined signal to the UE and the RMB, wherein the at least one of the other antenna channel signals of the RMB after the frequency conversion is performed After the frequency point is restored to the original frequency point, the UE is also sent to the UE, so that the UE can simultaneously receive the first antenna channel signal in the combined signal and the recovery signal of the frequency point recovery of at least one signal, thereby transmitting in the downlink manner through the wireless manner. MIMO is implemented; in the uplink transmission, the UE simultaneously sends the uplink signal to the signal transmission and reception branch and the RMB, and then the RMB transmits the frequency-converted uplink signal to the signal transmission and reception branch, and the LMU restores the converted uplink signal to the original signal. After the frequency point, the recovered signal and the received uplink signal are sent to the base station, so that MIMO is also realized in the uplink mode by wireless, which is visible. Multi-antenna technology can be implemented without increasing antenna deployment, enabling system performance to be improved without increasing cost.

In addition, the above method may also be implemented by using a discrete spectrum signal. For example, the embodiment of the present invention further provides another multi-antenna implementation method, which may be applied to the foregoing indoor multi-antenna system, where the indoor multi-antenna system includes: a base station, an LMU, a combining unit, a feeder, at least one signal transceiving branch connected to the feeder, and at least one RMB; wherein the base station outputs a plurality of antenna channel signals. As shown in FIG. 14, the method includes:

S301. Perform inverse fast Fourier transform (IFFT) or Inverse Discrete Fourier Transform (IDFT) on the first antenna channel signal of the plurality of antenna channel signals. Obtaining a discrete first antenna channel signal, combining other antenna channel signals other than the first antenna channel signal with the first data for IFFT or IDFT, to obtain discrete other antenna channel signals.

S302. Modulate the other antenna channel signals to obtain other modulated antenna channel signals.

S303: Cache the modulated first antenna channel signal and combine the modulated other antenna channel signals to obtain a combined signal.

S304. Send the combined signal to the UE and the at least one RMB, so that the RMB that receives the combined signal will receive at least one of the modulated other antenna channel signals to obtain at least one demodulation. After the other antenna channel signals, the demodulated other antenna channel signals are subjected to Fast Fourier Transform (FFT) or Discrete Fourier Transform (DFT) to remove the first data. Obtaining an original signal of at least one other antenna channel signal, and performing IFFT or IDFT on the original signal of the at least one other antenna channel signal to obtain at least one other discrete antenna channel signal that is the same as the frequency of the discrete first antenna channel signal. And transmitting at least one discrete other antenna channel signal that is the same as the frequency of the discrete first antenna channel signal to the UE, so that the UE receives the combined signal sent by one signal transceiver branch to obtain a discrete first in the combined signal An antenna channel signal and receiving at least one of the at least one transmitted by the RMB and the discrete first antenna channel signal The same point of the other antenna discrete channel signals.

The specific method of each step, the structure of each unit performing the above steps, and the connection relationship of each unit are completely the same as those in the indoor antenna system shown in FIG. 7. For details, refer to the foregoing system shown in FIG. The content of this will not be repeated.

In summary, the multi-antenna implementation method provided by the embodiment first performs IFFT or IDFT processing on the first antenna channel signal of the plurality of antenna channel signals output by the base station, and performs IFFT or the other antenna channel signal and the first data. IDFT processing, and then the obtained plurality of discrete antenna channel signals are combined and sent to the transmitting UE and the at least one RMB, and the RMB receiving the combined signal demodulates the received combined signal and demodulates the other The antenna channel signal performs FFT or DFT to remove the first data, and obtains the original signal of at least one other antenna channel signal. And then performing the IFFT or IDFT on the original signal to obtain at least one discrete other antenna channel signal that is the same as the frequency of the discrete first antenna channel signal, and transmitting the signal to the UE, so that the UE receives the combined signal The discrete first antenna channel signal and the discrete other antenna channel signals transmitted by the RMB, thereby implementing MIMO in a wireless manner, and it can be seen that the multi-antenna technology can be realized without increasing the antenna deployment, thereby being able to increase the cost without increasing the cost. Improve system performance in case.

The embodiment of the present invention further provides a multi-antenna implementation method, which can be applied to the foregoing outdoor multi-antenna system. As shown in FIG. 15, the method includes:

S401. Send a first group of antenna channel signals to the UE.

S402. Send at least one group of antenna channel signals except the first group of antenna channel signals to at least one aRRU, where each group of antenna channel signals includes at least two antenna channel signals of the plurality of antenna channel signals output by the base station. And the number of signals in each group of antenna channel signals is the same.

After the at least one aRRU receives at least one set of antenna channel signals, if the next stage of the aRRU is another aRRU, the aRRU transmits at least one of the at least one set of antenna channel signals to the other aRRU. Transmitting; if the next level of the aRRU is aRM, the aRRU performs frequency conversion of each of the at least one set of the antenna channel signals of the at least one set of antenna channel signals to obtain at least one group The converted antenna channel signal is sent to the aRM, so that the aRM restores the frequency corresponding to each of the received at least one set of the converted antenna channel signals to the signal of the first group of antenna channels. At least a set of recovered antenna channel signals are obtained from the frequency points of each antenna channel signal, and are transmitted to the UE, so that the UE is configured to receive the first group of antenna channel signals and the at least one set of restored antenna channel signals.

In order to enable a person skilled in the art to more clearly understand the technical solutions provided by the embodiments of the present invention, the multi-antenna implementation method provided by the embodiments of the present invention is described in detail below by way of specific embodiments. The outdoor multi-antenna system includes: a base station, an LM, a first antenna module, a second antenna module, at least one aRRU, and at least one aRM; wherein the base station outputs a plurality of antenna channel signals, at least two The antenna channel signals are a group, and the number of signals in each group of antenna channel signals is the same. In the downlink transmission, as shown in FIG. 16, the method includes:

S501. The base station sends, by using the first antenna module, a first group of antenna channel signals to the UE.

S502. The LM sends, by using the second antenna module, at least one group of antenna channel signals except the first group of antenna channel signals to the at least one aRRU.

S503. After the at least one set of antenna channel signals is received by the aRRU, if the next level of the aRRU is another aRRU, then S504 is performed; if the next level of the aRRU is aRM, then S505 is performed.

S504. The aRRU sends at least one of the received at least one set of antenna channel signals to another aRRU.

S505. The aRRU performs frequency conversion of each of the at least one set of antenna channel signals of the at least one set of antenna channel signals to obtain a minimum frequency of the antenna channel signals, and obtains at least one set of the converted antenna channel signals, and sends the signal to the aRM. send.

S506. The aRM restores the frequency point corresponding to each of the at least one set of the converted antenna channel signals to a frequency point of each antenna channel signal in the first group of antenna channel signals, to obtain at least one. The recovered antenna channel signal is sent to the UE.

S507. The UE receives the first group of antenna channel signals and the at least one group of restored antenna channel signals.

The specific method of each step, the structure of each unit performing the above steps, and the unit connection relationship are completely the same as those in the indoor antenna system shown in FIG. 8. For details, refer to the foregoing system shown in FIG. The content of this will not be repeated.

In the uplink transmission, as shown in FIG. 17, the method includes:

S508. The base station receives an uplink signal sent by the UE.

S509. The base station receives the IQ data signal sent by the at least one aRRU. The IQ data signal is subjected to signal synchronization and analog-to-digital conversion processing on the uplink signal by the aRM, and the processed signal is converted and sent to the aRRU.

The uplink signal is received by the base station by using the first antenna module, and the IQ data signal sent by the at least one aRRU is received by the LM from the second antenna module. The order of S508, S509 shown in Fig. 17 is merely exemplary, and in actual case, S508, S509 can also be performed simultaneously.

The specific method of each step, the structure of each unit performing the above steps, and the unit connection relationship are completely the same as those in the indoor antenna system shown in FIG. 9. For details, refer to the contents of the foregoing system shown in FIG. ,No longer.

Or, in the uplink transmission, as shown in FIG. 18, the method includes:

S510. The base station receives an uplink signal sent by the user equipment.

S511. The LM receives the frequency-converted uplink signal sent by at least one aRRU. The up-converted uplink signal is generated by aRM converting the uplink signal and sent to the aRRU.

S512 and LM restore the frequency of the received uplink signal to the same frequency as the uplink signal, obtain the recovered uplink signal, and send the restored uplink signal to the base station.

S513. The base station receives the restored uplink signal sent by the LM. Therefore, the base station obtains the uplink signal sent by the user equipment and the restored uplink signal sent by the LM.

The specific method of each step, the structure of each unit performing the above steps, and the connection relationship of each unit are completely the same as those in the indoor antenna system shown in FIG. 10, and specifically refer to the content in the foregoing system shown in FIG. ,No longer.

In summary, the multi-antenna implementation method provided by the embodiment of the present invention transmits a set of antenna channel signals to the UE through the first antenna module in the downlink transmission, and transmits the signals of the other group antenna channels to the UE through the second antenna module. aRRU, aRRU converts the other groups of antenna channel signals to aRM, re-converts the other groups of antenna channel signals after amplification, restores the original frequency points, and sends them to the UE, so that the UE can receive multiple sets of antennas at the same time. The channel signal is used to implement large-scale MIMO in the downlink mode. In the uplink transmission, the first antenna module receives the uplink signal sent by the UE, and sends the uplink signal to the base station, and the aRM receives the transmitted uplink signal to perform the uplink signal. The series is processed and sent to the aRRU, which is sent by the aRRU to the second antenna module, and is sent to the base station, so that the base station can receive multiple sets of antenna channel signals at the same time, thereby implementing large-scale MIMO in the uplink transmission in a wireless manner. Multi-antenna technology without increasing antenna deployment, enabling cost without increasing costs Under conditions to improve system performance.

In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. At another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some connections. The indirect coupling or communication connection of the port, device or unit may be in electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The above software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the methods of the various embodiments of the present invention. Part of the steps. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

An indoor multi-antenna system, comprising: a base station, a local multiple input multiple output unit LMU, a combining unit, a feeder, at least one signal transmitting and receiving branch connected to the feeder, and at least a remote input multi-output box RMB; wherein the base station outputs a plurality of antenna channel signals;

The LMU is configured to frequency-convert other antenna channel signals other than the first antenna channel signal of the plurality of antenna channel signals to obtain other antenna channel signals after frequency conversion, wherein each of the other antenna channel signals after the frequency conversion is used The frequency of the signal is different;

The combining unit is configured to combine the first antenna channel signal and the frequency-converted other antenna channel signals to obtain a combined signal; and the combined signal is transmitted to the at least one signal through the feeder Transmitting and transmitting a branch, and transmitting the combined signal to the user equipment and the at least one of the RMBs;

The RMB is used to restore a frequency point of at least one of the converted other antenna channel signals to the same frequency point as the first antenna channel signal, to obtain at least one of the received combined signals. Recovering the antenna channel signal, and transmitting the at least one restored antenna channel signal to the user equipment;

The user equipment is configured to receive the combined signal sent by a signal transceiver branch, acquire the first antenna channel signal in the combined signal, and receive the at least one recovery sent by at least one of the RMB Rear antenna channel signal.
The indoor multi-antenna system according to claim 1, further comprising:

The user equipment is configured to send an uplink signal to the one signal transceiver branch and the at least one RMB;

The RMB is configured to receive the uplink signal, perform frequency conversion on the received uplink signal, obtain an up-converted uplink signal, and send the frequency-converted uplink signal to the one signal transceiver branch;

The signal transmitting and receiving branch is configured to receive the uplink signal and the frequency-converted uplink signal, and transmit the uplink signal and the frequency-converted uplink signal as a signal to the LMU through the feeder;

The LMU is configured to restore the frequency-converted uplink signal to the same frequency point as the uplink signal, obtain a recovered uplink signal, and obtain the uplink signal and the restored uplink signal. The uplink signal is transmitted to the base station.
The indoor multi-antenna system according to claim 1 or 2, characterized in that

The combining unit is externally connected to the LMU, wherein a first end of the LMU is connected to the base station, and a second end of the LMU is connected to a first end of the combining unit, the combining unit The second end of the second end is connected to each of the signal transceiver branches through the feeder;

Alternatively, the combining unit is built in the LMU, the first end of the LMU is connected to the base station, and the second end of the LMU is connected to each of the signal transmitting and receiving branches through the feeder;

The LMU is externally connected to the base station or built in the base station;

The signal transmitting branch includes: a coupler, a power splitter, and at least one antenna, an input end of the coupler is connected to the feeder, an output of the coupler, and an input of the power splitter The terminals are connected, and the output of the power splitter is connected to each of the antennas.
The indoor multi-antenna system according to claim 3, wherein the combining unit is specifically configured to:

Obtaining at least one of a reference clock signal, a preset synchronization signal, and an operation and maintenance signal of a preset frequency output by the base station;

Combining the first antenna channel signal, the frequency-converted other antenna channel signal, and the signal of the preset frequency, the preset synchronization signal, and the operation and maintenance signal to obtain a path The combined signal.
The indoor multi-antenna system according to claim 4, wherein the reference clock signal comprises a signal having a frequency of 10 MHz or a signal having a frequency of 122.88 MHz;

When the indoor multi-antenna system is applied to a time division duplex system, the preset synchronization signal is a control signal for transmitting and receiving switching;

The operation and maintenance signal includes at least one of a gain control signal, a delay control signal, and a phase adjustment signal.
The indoor multi-antenna system according to claim 5, wherein the RMB is further used to:

And adjusting, according to the operation and maintenance signal, a transmission characteristic parameter of a downlink of the RMB, where the transmission characteristic parameter of the downlink includes at least one of an amplification gain, a delay parameter, and a phase parameter.
The indoor multi-antenna system according to claim 2, wherein the RMB is further used for:

Adjusting, according to the received combined signal, or according to the uplink signal sent by the user equipment, a downlink transmission characteristic parameter of the RMB; the downlink transmission characteristic parameter includes an amplification gain At least one of a delay parameter and a phase parameter.
The indoor multi-antenna system according to claim 2, wherein the base station is further configured to:

And adjusting, according to the uplink signal sent by the user equipment, or a channel status indication sent by the user equipment, a downlink transmission characteristic parameter of the RMB, where the downlink transmission characteristic parameter includes an amplification At least one of a gain, a delay parameter, and a phase parameter.
The indoor multi-antenna system according to claim 3, wherein the base station is further configured to:

During initialization, the parameters of the signals transmitted by the multiple antenna channels of the base station are adjusted according to the initial transmission characteristic parameters of the downlink of the RMB, so that the antenna channel signals transmitted by the multiple antenna channels are adjusted. The error of the parameter is within the preset range;

The initial transmission characteristic parameter of the downlink includes: at least one of an amplification gain, a delay parameter, and a phase parameter;

The parameters of the antenna channel signal include at least one of delay, amplitude, and phase.
The indoor multi-antenna system according to claim 3, characterized in that

The user equipment is further configured to acquire a measurement result according to all antenna channel signals that the user equipment can receive, and send the measurement result to the base station, where the measurement result includes each antenna channel signal that can be received. Signal to noise ratio

The base station is further configured to use the proportional fairness criterion to schedule time-frequency resources for the user equipment according to the measurement result, the data that the user equipment has scheduled, and the current data transmission rate of the user equipment.
A local multiple input multiple output unit LMU, wherein the LMU includes: at least one downlink transmission unit, the downlink transmission unit includes: a first frequency converter, a first filter, a first power amplification module, and a first Diplexer;

Wherein the signal of any antenna channel of the base station is from the first input end of the first frequency converter Input, an output end of the first frequency converter is connected to an input end of the first filter, and an output end of the first filter is connected to an input end of the first power amplification module, the first power An output of the amplification module is coupled to an input of the first duplexer, and an output of the first duplexer is coupled to a feeder in the indoor multi-antenna system.
The LMU according to claim 11, wherein the downlink transmission unit further comprises: a second filter, a power divider, a second power amplification module, and a first phase locked loop;

The input end of the second filter is used to input a reference clock signal, the output end of the second filter is connected to the input end of the power splitter, and the first output end of the power splitter is connected to the An input end of the first phase locked loop, an output end of the first phase locked loop is connected to a second input end of the first frequency converter, and a second output end of the power splitter is connected to the second power amplification module The input end of the second power amplifying module is connected to the first duplexer;

A preset synchronization signal and an operation and maintenance signal are connected to the first duplexer.
The LMU according to claim 11 or 12, wherein the LMU further comprises: at least one uplink transmission unit, the uplink transmission unit comprises: a second duplexer, a third power amplification module, and a fourth power amplification Module, second frequency converter, third filter, fifth power amplification module;

The input end of the second duplexer is connected to a feeder in the indoor multi-antenna system, and the first output end of the second duplexer is connected to the input end of the third power amplifying module, the third power The output end of the amplification module is connected to the base station in the indoor multi-antenna system; the second output end of the second duplexer is connected to the input end of the fourth power amplification module, and the output end of the fourth power amplification module Connecting a first input end of the second frequency converter, an output end of the second frequency converter is connected to an input end of the third filter, and an output end of the third filter is connected to the fifth power amplification module The output of the fifth power amplifying module is connected to the base station.
The LMU according to claim 13, wherein the uplink transmission unit further comprises: a sixth power amplification module and a second phase locked loop;

The input end of the sixth power amplifier is used to input a reference clock signal, the output end of the sixth power amplifier is connected to the input end of the second phase locked loop, and the output end of the second phase locked loop is connected. a second input of the second frequency converter.
The LMU of claim 14 wherein said second power amplification The module, the third power amplification module, the fourth power amplification module, the fifth power amplification module, and the sixth power amplification module are power amplifiers;

The first power amplification module is composed of a gain adjustable power amplifier and a power amplifier connected in series.
A remote input multiple output box RMB, wherein the RMB includes: at least one downlink transmission unit, a first antenna, and a second antenna, where the downlink transmission unit includes: a first duplexer, a first power amplification Module, first frequency converter, first filter, second power amplification module;

The first antenna is connected to an input end of the first duplexer, and a first output end of the first duplexer is connected to an input end of the first power amplifier, where the first power amplification module is The output end is connected to the first input end of the first frequency converter, the output end of the first frequency converter is connected to the input end of the first filter, and the output end of the first filter is connected to the second power An input end of the amplification module, and an output end of the second power amplification module is connected to the second antenna.
The remote input multi-output box RMB according to claim 16, wherein the downlink transmission unit further comprises: a third power amplification module, a first phase locked loop;

The second output end of the first duplexer is connected to the input end of the third power amplifying module, and the second output end of the first duplexer is configured to output the received reference clock signal, The output end of the third power amplifier module is connected to the input end of the first phase locked loop, and the output end of the first phase locked loop is connected to the second input end of the first frequency converter.
The RMB according to claim 16 or 17, wherein the RMB further comprises: at least one uplink transmission unit, the uplink transmission unit comprises: a second filter, a fourth power amplification module, a second frequency converter, a third filter, a fifth power amplification module;

The first antenna is connected to the input end of the second filter, the output end of the second filter is connected to the input end of the fourth power amplifying module, and the output end of the fourth power amplifying module is connected. a first input end of the second frequency converter, an output end of the second frequency converter is connected to an input end of the third filter, and an output end of the third filter is connected to an input of the fifth power amplifier The output of the fifth power amplifier is connected to the second antenna.
The RMB according to claim 18, wherein said uplink transmission unit The method further includes: a fourth filter, a power splitter, and a second phase locked loop;

The input end of the fourth filter is used to input a reference clock signal, the output end of the fourth filter is connected to the input end of the power splitter, and the output end of the power splitter is connected to the second An input end of the phase locked loop, and an output end of the second phase locked loop is connected to the second input end of the second frequency converter.
The RMB according to claim 19, characterized in that

The first power amplification module, the third power amplification module, and the fourth power amplification module are power amplifiers;

The second power amplification module and the fifth power amplification module are composed of a gain adjustable power amplifier and a power amplifier connected in series.
An indoor multi-antenna system, comprising: a base station, a local multiple input multiple output unit LMU, a combining unit, a feeder, at least one signal transmitting and receiving branch connected to the feeder, and at least a remote input multi-output box RMB; wherein the base station outputs a plurality of antenna channel signals;

The base station is configured to perform an inverse fast Fourier transform IFFT or an inverse discrete Fourier transform IDFT on the first antenna channel signal of the multiple antenna channel signals to obtain a discrete first antenna channel signal, and the first antenna channel Other antenna channel signals other than the signal are combined with the first data for IFFT or IDFT to obtain discrete other antenna channel signals;

The LMU is configured to modulate the discrete other antenna channel signals to obtain modulated other antenna channel signals;

The base station buffers the modulated first antenna channel signal and transmits the signal to the combining unit, and the LMU transmits the modulated other antenna channel signal to the combining unit;

The combining unit is configured to combine the discrete first antenna channel signals with the modulated other antenna channel signals to obtain a combined signal; the combining unit passes the combined road through the feeder Transmitting a signal to the at least one signal transceiving branch, and transmitting the combined signal to the user equipment and the at least one of the RMBs;

The RMB is configured to demodulate at least one of the modulated other antenna channel signals into the received combined signal to obtain at least one demodulated other antenna channel signal, and then perform the demodulation The other antenna channel signals are subjected to FFT or DFT to remove the first data, to obtain an original signal of at least one other antenna channel signal, and then the at least one The original signals of the other antenna channel signals are subjected to IFFT or IDFT to obtain at least one other antenna channel signal that is the same as the frequency of the discrete first antenna channel signals, and the at least one and the first of the discrete Dissipating other antenna channel signals of the antenna channel signal having the same frequency point to the user equipment;

The user equipment is configured to receive the combined signal sent by a signal transceiver branch, acquire the discrete first antenna channel signal in the combined signal, and receive the at least one of the at least one of the RMB transmissions A discrete other antenna channel signal that is the same as the frequency of the discrete first antenna channel signal.
The indoor multi-antenna system according to claim 21, wherein

The combining unit is externally connected to the LMU, wherein a first end of the LMU is connected to the base station, and a second end of the LMU is connected to a first end of the combining unit, the combining unit The second end of the second end is connected to each of the signal transceiver branches through the feeder;

Alternatively, the combining unit is built in the LMU, the first end of the LMU is connected to the base station, and the second end of the LMU is connected to each of the signal transmitting and receiving branches through the feeder;

The LMU is externally connected to the base station or built in the base station;

The signal transmitting branch includes: a coupler, a power splitter, at least one antenna, an input end of the coupler is connected to the feed line, and an output end of the coupler is connected to an input end of the power splitter The output of the power splitter is connected to each of the antennas.
An outdoor multi-antenna system, comprising: a base station, a local module, a first antenna module, a second antenna module, at least one evolved remote radio unit, and at least one evolved remote module; The base station outputs a plurality of antenna channel signals, and the at least two antenna channel signals are grouped, and the number of signals in each group of antenna channel signals is the same;

Transmitting, by the first antenna module, the first group of antenna channel signals to the user equipment by using the first antenna module;

The local module is configured to send at least one group of antenna channel signals except the first group of antenna channel signals to the at least one evolved remote radio unit through the second antenna module;

If the next level of the evolved remote radio unit is another evolved remote radio unit, The evolved remote radio unit is configured to send at least one of the received at least one set of antenna channel signals to the another evolved remote radio unit; if the evolved remote radio unit is under The first stage is the evolved remote module, and the evolved remote radio unit is configured to separately perform each of the at least one set of the antenna channel signals of the received at least one set of antenna channel signals. Frequency conversion of the frequency point, obtaining at least one set of converted antenna channel signals, and transmitting to the evolved remote module;

The evolved remote module is configured to restore a frequency point corresponding to each of the at least one set of the converted antenna channel signals to each of the first group of antenna channel signals At least a set of recovered antenna channel signals are obtained from the frequency of the channel signal and sent to the user equipment;

The user equipment is configured to receive the first group of antenna channel signals sent by the first antenna module, and receive the at least one set of restored antenna channel signals sent by the infinite remote module.
The outdoor multi-antenna system according to claim 23, wherein

The user equipment is further configured to send an uplink signal to the first antenna module and an evolved remote module;

The evolved remote module is further configured to perform signal synchronization and analog-to-digital conversion processing on the received uplink signal, and convert the processed signal into an in-phase orthogonal IQ data signal, and forward the IQ data signal to the The evolved remote radio unit of the evolved remote module is sent by the evolved remote radio unit;

If the upper stage of the evolved remote radio unit is the second antenna module, the evolved remote radio unit is further configured to send the received IQ data signal to the second antenna module; The upper stage of the remote radio unit is another evolved remote radio unit, and the evolved remote radio unit is further configured to send the received IQ data signal to the another evolved remote radio unit until sent to the Said second antenna module;

The base station is further configured to receive the uplink signal received by the first antenna module, and receive the IQ data signal that is received by the local module by using the second antenna module.
The outdoor multi-antenna system according to claim 23, wherein

The user equipment is further configured to send an uplink signal to the first antenna module and an evolved remote module;

The evolved remote module is further configured to perform frequency conversion on the uplink signal to obtain a frequency converted And sending an uplink signal to the evolved remote radio unit of the egress of the evolved remote module;

If the upper stage of the evolved remote radio unit is the second antenna module, the evolved remote radio unit is further configured to send the received uplink signal to the second antenna module; The evolved remote radio unit is further configured to send the received uplink signal to the another evolved remote radio unit. Until being sent to the second antenna module;

The local module is further configured to restore a frequency point of the frequency-converted uplink signal received by the second antenna module to a frequency point that is the same as the uplink signal, to obtain a recovered uplink signal, and to the Sending, by the base station, the recovered uplink signal;

The base station is further configured to receive the uplink signal received by the first antenna, and receive the restored uplink signal sent by the local module.
An outdoor multi-antenna system according to any of claims 23-25, characterized in that

The first evolved remote module is further configured to transmit a signal to the second evolved remote module, where the signal includes any one of the converted antenna channel signal, the IQ data signal, and the frequency-converted uplink signal. ;

The first evolved remote module and the second evolved remote module are any two evolved remote modules of the at least one evolved remote module.
A multi-antenna implementation method, the method comprising:

Transforming other antenna channel signals other than the first antenna channel signal of the plurality of antenna channel signals output by the base station to obtain other antenna channel signals after frequency conversion, wherein frequency of each signal in the other antenna channel signals after the frequency conversion different;

Combining the first antenna channel signal with the frequency-converted other antenna channel signals to obtain a combined signal;

Transmitting the combined signal to the user equipment and the at least one remote input multi-output box RMB, so that the other antenna of the combined signal in the combined signal that the RMB of the combined signal will receive is received Recovering a frequency point of at least one of the channel signals to the same frequency point as the first antenna channel signal, obtaining at least one recovered antenna channel signal, and transmitting the at least one restored antenna channel signal to the user The device sends, so that the user equipment acquires the first antenna channel signal in the combined signal, and receives at least one of the at least one restored antenna channel signal sent by the RMB.
The method of claim 27, wherein the method further comprises:

Receiving an uplink signal sent by the user equipment, and receiving an up-converted uplink signal sent by at least one RMB;

Recovering the converted uplink signal to the same frequency point as the uplink signal, and obtaining the restored uplink signal;

Sending the uplink signal and the recovered uplink signal to the base station.
A multi-antenna implementation method, the method comprising:

Performing an inverse fast Fourier transform IFFT or an inverse discrete Fourier transform (IDFT) on the first antenna channel signal of the plurality of antenna channel signals to obtain a discrete first antenna channel signal, and using the antenna other than the first antenna channel signal The channel signal is combined with the first data for IFFT or IDFT to obtain discrete other antenna channel signals;

Modulating the discrete other antenna channel signals to obtain modulated other antenna channel signals;

The modulated first antenna channel signal is buffered and combined with the modulated other antenna channel signals to obtain a combined signal;

Transmitting the combined signal to the user equipment and the at least one of the RMBs, so that the combined signal that the RMB that receives the combined signal will receive, in the modulated other antenna channel signals Demodulating at least one signal to obtain at least one demodulated other antenna channel signal, and performing fast Fourier transform FFT or discrete Fourier transform DFT on the demodulated other antenna channel signal to remove the first Data, obtaining an original signal of at least one other antenna channel signal, and performing an IFFT or IDFT on the original signal of the at least one other antenna channel signal to obtain at least one dispersion that is the same as a frequency of the discrete first antenna channel signal And the other antenna channel signals transmit the at least one discrete other antenna channel signal that is the same as the frequency of the discrete first antenna channel signal to the user equipment, so that the user equipment receives a signal transmission and reception branch Transmitting the combined signal, acquiring the discrete first antenna channel signal in the combined signal, and receiving at least one The RMB frequency transmitting at least one first discrete antenna and the channel signal is the same as the other antenna discrete channel signals.
A multi-antenna implementation method, the method comprising:

Sending a first set of antenna channel signals to the user equipment;

Transmitting at least one set of antenna channel signals other than the first set of antenna channel signals to the at least one evolved remote radio frequency unit; wherein each set of antenna channel signals comprises at least one of a plurality of antenna channel signals output by the base station Two antenna channel signals, and the number of signals in each group of antenna channel signals is the same;

After the at least one evolved remote radio unit receives the at least one antenna channel signal, if the next stage of the evolved remote radio unit is another evolved remote radio unit, the evolved far end The radio unit transmits at least one of the received at least one set of antenna channel signals to the another evolved remote radio unit; if the next stage of the evolved remote radio unit is the evolution The remote module, the evolved remote radio unit performs frequency conversion of each of the at least one set of the antenna channel signals of the at least one set of antenna channel signals to obtain at least one And converting the antenna channel signal to the evolved remote module, so as to receive the frequency of each of the at least one set of the converted antenna channel signals received by the evolved remote module Point corresponding to recovering to a frequency point of each antenna channel signal of the first group of antenna channel signals, obtaining at least one set of recovered antenna channel signals, and providing the user with the antenna channel signal Preparation transmission, so that the user equipment is configured to receive the first group of antenna channel signal and the antenna signal recovery channel at least one group.
The method of claim 30, wherein the method further comprises:

Receiving an uplink signal sent by the user equipment;

Receiving, by the at least one evolved remote radio unit, an IQ data signal, where the IQ data signal is subjected to signal synchronization and analog-to-digital conversion processing on the uplink signal by the evolved remote module, and converting the processed signal to obtain And sent to the evolved remote radio unit.
The method of claim 30, wherein the method further comprises:

Receiving an uplink signal sent by the user equipment;

Receiving, by the at least one evolved remote radio unit, the frequency-converted uplink signal, where the converted uplink signal is generated by the evolved remote module, and sent to the evolved remote end Radio frequency unit

The frequency point of the received up-converted uplink signal is restored to the same frequency point as the uplink signal, and the recovered uplink signal is obtained.