KR101400235B1 - Low complexity relay control method and system for two-ray amplify-and-forward system with with multiple antennas - Google Patents

Low complexity relay control method and system for two-ray amplify-and-forward system with with multiple antennas Download PDF

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KR101400235B1
KR101400235B1 KR1020130038766A KR20130038766A KR101400235B1 KR 101400235 B1 KR101400235 B1 KR 101400235B1 KR 1020130038766 A KR1020130038766 A KR 1020130038766A KR 20130038766 A KR20130038766 A KR 20130038766A KR 101400235 B1 KR101400235 B1 KR 101400235B1
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signal processing
matrix
repeater
terminals
transmission
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KR1020130038766A
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Korean (ko)
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최준성
장원범
천병진
김철순
이용훈
김성진
김민현
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국방과학연구소
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15535—Control of relay amplifier gain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15542—Selecting at relay station its transmit and receive resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15564—Relay station antennae loop interference reduction
    • H04B7/15585—Relay station antennae loop interference reduction by interference cancellation

Abstract

The present invention relates to a relay control technique and, more specifically, to a relay control method which obtains performances for coming close to an optimal transmission rate in low complexity in a repeater system transmitting a signal after amplifying the signal in both directions by using a plurality of antennas. The present invention can obtain transmission rate performances coming close to a maximum transmission rate which can be obtained in an existing communication environment with the low complexity.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a low complexity relay control method and a repeater system for multi-antenna bi-

The present invention relates to a relay control technique, and more particularly, to a relay control method for obtaining performance close to an optimum transmission amount with low complexity in a bi-directional amplified transmission repeater system using a plurality of antennas.

The present invention also relates to a repeater system that performs bi-directional amplification using a plurality of antennas, and then achieves a performance close to an optimum transmission amount with low complexity.

In cellular systems, the inter-cell interference signal greatly degrades the signal quality of the edge user. When the distance from the transmitter is long, the strength of the received signal is weakened due to signal attenuation. Therefore, Lt; / RTI >

Also, even if terminals exchange data with each other in an Ad-hoc system, if the distance between the terminals is long, the user also has a problem of transmitting / receiving data with a low transmission amount due to signal attenuation.

To solve this problem, a repeater for amplifying and transmitting signals between a base station and a terminal or between terminals has been proposed. The introduction and use of repeaters are becoming visible through the organization and standardization finance of standardization organizations such as IEEE 802.16j, and the frame structure and protocol establishment.

A widely used relaying method in cellular and ad hoc systems to date is a relaying method that supports unidirectional data transmission from one terminal to another terminal in a unidirectional relaying scheme.

In the unidirectional relaying method, the terminal that transmits data to the first phase transmits data to the repeater, and the data received by the repeater is transmitted to the counterpart terminal in the second phase.

In case of using this unidirectional relay scheme in a system for exchanging information, data is exchanged by using 4 phases in each phase for 2 phases, which is very inefficient.

1. Korean Patent Publication No. 10-2012-0047337 2. Korean Patent Publication No. 10-2011-0104806

1. R. Zhang et al., "Optimal beamforming for two-way multi-antenna relay channel with analogue network coding," IEEE JSAC 2008

The present invention has been proposed in order to solve the problem according to the above background art and provides a relay control method of low complexity that obtains performance close to the optimal transmission amount with low complexity in a bidirectional amplified transmission repeater system using a plurality of antennas It has its purpose.

It is another object of the present invention to provide a repeater system that performs bidirectional amplification using a plurality of antennas, and then transmits the amplified signals with a low complexity to obtain an optimum performance.

In order to achieve the above-described object, the present invention provides a low-complexity relay control method for obtaining a performance close to an optimum transmission amount with low complexity in a bidirectional amplified transmission repeater system using a plurality of antennas.

In the relay control method of low complexity,

A signal receiving step in which a repeater receives a signal from a plurality of terminals;

A transmission signal transmission step in which the repeater amplifies a reception signal received from the plurality of terminals through a linear signal processing matrix and simultaneously transmits the amplified transmission signal to the plurality of terminals; And

And a decoding step of decoding the transmission signal by the plurality of terminals through a magnetic signal cancellation technique.

The calculating of the linear signal processing matrix may include: defining an alternative transformation matrix for simplifying a transfer capacity maximization problem of the plurality of terminals through spatial matrix transformation; Separating to optimize the size or orientation of the alternative transformation matrix; Performing a simplifying theorem on the separated alternative transformation matrix using the vector technique; And calculating the linear signal processing matrix by optimizing the simplified alternative transformation matrix by using the Convex optimization technique.

In addition, the linear signal processing matrix may be calculated based on algorithms of received signal processing and transmission signal processing.

In addition, the linear signal processing matrix may be calculated based on algorithms of received signal processing, transmission signal processing, and power control.

Also, the size of the linear signal processing matrix may be M × M, and M may be the number of antennas of the repeater.

In addition, the plurality of terminals may have the same channel when transmitting to and from the repeater.

On the other hand, in another embodiment of the present invention,

A plurality of terminals; And

A repeater for amplifying a received signal received from the plurality of terminals through a linear signal processing matrix and transmitting the amplified transmission signal to the plurality of terminals simultaneously,

And the plurality of terminals decode the transmission signal through a magnetic signal cancellation technique.

According to the present invention, a throughput performance close to the maximum throughput obtained in a communication environment given a low complexity can be obtained.

1 is a configuration diagram of a repeater system 100 in which two terminals having a single antenna according to an embodiment of the present invention exchange information with each other through a bidirectional repeater having a plurality of antennas.
FIG. 2 is a conceptual diagram showing the reception signal processing and the transmission signal processing performed by the repeater transmission / reception algorithm 1 according to an embodiment of the present invention.
FIG. 3 is a conceptual diagram illustrating receiving signal processing, transmission signal processing, and power control performed by the repeater transmission / reception algorithm 2 according to another embodiment of the present invention.
FIG. 4 is a graph showing a result of verifying the throughput performance through the simulation according to FIGS. 1 to 3. FIG.
5 is a flowchart illustrating a signal processing process according to an embodiment of the present invention.
6 is a flowchart showing a process of generating the linear signal processing matrix shown in FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Should not.

Hereinafter, a low-complexity relay control method and a repeater system for performing multi-antenna bi-directional amplification and transmission according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a repeater system 100 in which two terminals having a single antenna according to an embodiment of the present invention exchange information with each other through a bidirectional repeater having a plurality of antennas. Referring to FIG. 1, in order to exchange data between two terminals 110 and 120, data is simultaneously transmitted from the first phase to the repeater 130. In the second phase, the repeater 130 transmits the received signal to each of the terminals 110 and 120 ) At the same time.

Here, the repeater system 100 may be a bi-directional Amplify and Forward (AF) MIMO (Multi-Input Multi-Output) system.

Since the first terminal 110 and the second terminal 120 know the magnetic interference signal which is a signal transmitted from the first terminal 110 and the second terminal 120, the first terminal 110 and the second terminal 120 remove the magnetic interference signal from the received signal and decode the signal transmitted by the counterpart.

The repeater 130 is advantageous in terms of transmission efficiency because it requires only one-half phase compared to a unidirectional repeater to exchange data as a bidirectional repeater.

As shown in FIG. 1, an operation form of a repeater in a repeater system for bi-directional amplification in which two terminals 110 and 120 having a repeater 130 therebetween transmit / receive data over two phases is transmitted.

The repeater 130 assumes a repeater for amplifying and transmitting after amplifying (linear signal processing) signals without receiving signals from the first terminal 110 and the second terminal 120, The repeater 130 transmits / receives a signal of each terminal through a plurality of antennas 131-1 to 131-m.

Here, it is assumed that each of the terminals 110 and 120 uses one antenna 111 and 121, respectively. As shown in Figure 1, the channel between each terminal 110, 120 and the repeater 130 is

Figure 112013030867765-pat00001
And it is assumed that the channel for transmission to the repeater 130 and the channel for reception from the repeater are the same in order to simplify the representation.

In addition, the following general expression is utilized to explain a relay control method of low complexity in which multi-antenna bi-directional amplification is performed after transmission according to an embodiment of the present invention.

Figure 112013030867765-pat00002
silver
Figure 112013030867765-pat00003
by
Figure 112013030867765-pat00004
, ≪ / RTI >
Figure 112013030867765-pat00005
Vector
Figure 112013030867765-pat00006
(Norm),
Figure 112013030867765-pat00007
Denotes a transpose.

Figure 112013030867765-pat00008
Matrix A and matrix
Figure 112013030867765-pat00009
Is the Hadamard product of.

Finally, real () denotes the real component of the complex number.

In one embodiment of the present invention, the received signal of the repeater 130 receiving the signal transmitted from each of the terminals 110 and 120 to the phase 1 can be expressed by the following equation.

Figure 112013030867765-pat00010

here,

Figure 112013030867765-pat00011
Are signals transmitted from terminals 110 and 120, respectively,
Figure 112013030867765-pat00012
Lt; / RTI >

Figure 112013030867765-pat00013
Is a channel vector from each terminal 110 and 120 to the repeater, and the size of the channel vector is the number of antennas of the repeater
Figure 112013030867765-pat00014
Respectively.

Finally

Figure 112013030867765-pat00015
Is an Additive White Gaussian Noise (AWGN) experienced by a repeater, and has a complex Gaussian characteristic
Figure 112013030867765-pat00016
.

In the embodiment of the present invention, the antenna of each terminal is assumed to be one, but the present invention is not limited to this, and it is easily extendable to a terminal utilizing a plurality of antennas.

The repeater signal processing method according to an exemplary embodiment of the present invention includes:

Figure 112013030867765-pat00017
To a linear signal processing matrix
Figure 112013030867765-pat00018
And the signal processing matrix
Figure 112013030867765-pat00019
The size of
Figure 112013030867765-pat00020
x
Figure 112013030867765-pat00021
And is determined according to the number of repeater antennas.

Repeater Transmission signal transmitted after repeater signal processing

Figure 112013030867765-pat00022
Can be expressed as a linear equation as shown in the following equation.

Figure 112013030867765-pat00023

Finally, in the phase 2, the signals transmitted through the repeater 130 are received,

Figure 112013030867765-pat00024
,
Figure 112013030867765-pat00025
Can be expressed by the following equation.

Figure 112013030867765-pat00026

Figure 112013030867765-pat00027

At this time, since each of the terminals 110 and 120 knows its own signal, channel, and relay matrix, it can decode the signal through self interference cancellation.

As shown in the above equations, the received signals of the terminals 110 and 120 are transmitted to the repeater signal processing matrix

Figure 112013030867765-pat00028
And the problem of maximizing the capacity of each terminal can be expressed as a weighted sum rate maximization problem as shown in the following equation.

Figure 112013030867765-pat00029

here,

Figure 112013030867765-pat00030
The right term in the function means the SNR component,
Figure 112013030867765-pat00031
,
Figure 112013030867765-pat00032
Denotes a fixed value that can be predetermined in the system according to the importance of each link, which is a weight value of a signal size of each terminal.

Therefore, a matrix for maximizing the transmission capacity using Equation (5)

Figure 112013030867765-pat00033
Is to find. Considering the transmission power of the repeater 130, the following condition must be satisfied.

Figure 112013030867765-pat00034

here,

Figure 112013030867765-pat00035
to be.

The problem of maximizing the weighted transmission sum can be solved by selecting the best local optimum value after taking the derivative for the right term, but it is generally not easy to solve. Therefore, in the embodiment of the present invention, And a repeater transmission matrix

Figure 112013030867765-pat00036
Suggests ways to get.

Repeater transmission matrix

Figure 112013030867765-pat00037
, We can consider a simplification of the maximization problem through the spatial matrix transformation as the following equation. In other words, applying a slight change to existing variables,
Figure 112013030867765-pat00038
.

Figure 112013030867765-pat00039

here,

Figure 112013030867765-pat00040
And {
Figure 112013030867765-pat00041
} ≪ / RTI > size < RTI ID = 0.0 >
Figure 112013030867765-pat00042
Can be separated as shown in the following equation.

Figure 112013030867765-pat00043

here,

Figure 112013030867765-pat00044
Is a direction vector of size 1,
Figure 112013030867765-pat00045
,
Figure 112013030867765-pat00046
Is a positive number.

One embodiment of the present invention is a method

Figure 112013030867765-pat00047
It includes a method to determine the vector as follows.

Figure 112013030867765-pat00048

Figure 112013030867765-pat00049
The problem of maximizing the transmission sum for a repeater linear signal processing matrix using a vector is simplified as shown in the following equation.

Figure 112013030867765-pat00050

here,

Figure 112013030867765-pat00051
,
Figure 112013030867765-pat00052
,
Figure 112013030867765-pat00053
,
Figure 112013030867765-pat00054
to be.

Also, the repeater signal processing matrix proposed by the present invention encompasses the following optimization method. Equation (10) for the transmission power limitation condition of the transformed optimization problem can be summarized as the following equation.

Figure 112013030867765-pat00055

Here,

Figure 112013030867765-pat00056
The
Figure 112013030867765-pat00057
to be. In summary, the equation (11) can be summarized as a convex optimization problem expressed by the following equation.

Figure 112013030867765-pat00058

here,

Figure 112013030867765-pat00059
Lt;
Figure 112013030867765-pat00060
,
Figure 112013030867765-pat00061
,
Figure 112013030867765-pat00062
to be.

The maximization problem of Equation (12) can be solved efficiently by a simple computer algorithm using a convex optimization technique.

The signal processing matrix of the repeater considered in the present invention

Figure 112013030867765-pat00063
The design scheme of

Figure 112013030867765-pat00064

Up to this point, a repeater signal processing matrix (hereinafter, referred to as " repeater signal processing ") 210 is performed by using a reception signal processing 200 such as matched filtering and a transmission signal processing 210 such as zero-

Figure 112013030867765-pat00065
As shown in Fig.

However, in addition to Algorithm 1 shown in Fig. 2, in accordance with the repeater transmission / reception algorithm 2 shown in Fig. 3,

Figure 112013030867765-pat00066
Includes receive signal processing 300 such as matched filtering, transmit signal processing 310 such as zero forcing, and power control 320 schemes.

FIG. 4 is a graph showing a result of verifying the throughput performance through the simulation according to FIGS. 1 to 3. FIG. That is, FIG. 4 shows a test of the throughput performance in the following environment in order to check the performance of the embodiment of the present invention.

It can be seen that the experimental environment is close to the maximum throughput performance (expressed as 'upper bound') obtained through the optimal repeater design method when the antenna of the repeater is four and the transmission power of each terminal and the repeater is the same.

Also, it can be seen that the performance of the MRR-MRT (Maximum Ratio Reception and Maximal-Ratio Transmission) scheme, which is a low complexity technology, is more advantageous.

Here, the MRR-MRT method can be expressed as a dual matched filter. In FIG. 4, the performance of the proposed scheme is expressed as MRR-ZFT (zero-forcing transmission) / optimal and MRR-ZFT / equal, where the former refers to a scheme including power control and the latter does not include power control.

The complexity of the technique proposed in the present invention is as follows, in comparison with the technique using Equation (5) and the MRR-MRT technique. Table 1 shows the complexity of the system using M repeater antennas. Where O () denotes the order of maximum complexity of the computational complexity.

division Complexity Matrix multiplication optimization Zero-forcing Suggestions O (2M ^ 2) O (2) O (2 ^ 3) Upper bound (Equation 5) O (2M ^ 2) O (M ^ 2) * number of initial values O (M ^ 3) MRR-MRT O (2M ^ 2) - -

In the case of the MRR-MRT scheme, only the matrix multiplication is required. In the case of Equation (5), all operations necessary for the inverse of the channel and / or optimization are proportional to the number of antennas.

On the other hand, according to the embodiment of the present invention, the complexity required for the optimization and the inverse of the channel is proportional to the number of UEs.

FIG. 5 is a flowchart showing a procedure for relay control with low complexity in a repeater system (130 in FIG. 1) and a repeater system after bidirectional amplification between terminals (110 and 120 in FIG. 1). That is, FIG. 5 is a flowchart illustrating a process of processing a repeater signal using a repeater transmission / reception algorithm 1 (MMR-ZFT / equal) or a repeater transmission / reception algorithm 2 (MMR-ZFT / optimal).

Referring to FIG. 5, each terminal (110,120 in FIG. 1) transmits a signal to a repeater (130 in FIG. 1) (step S500).

The repeater 130 receives signals from the terminals 110 and 120, amplifies the received signals through the linear signal processing matrix, and transmits the transmission signals to the terminals 110 and 120 at the same time (step S520).

Each of the terminals 110 and 120 decodes the transmitted transmission signal through a magnetic signal cancellation technique (step S530).

 6 is a flowchart showing a process of generating the linear signal processing matrix shown in FIG. Referring to FIG. 6, an alternative transformation matrix is defined to simplify the problem of maximizing transmission capacity of each terminal through spatial matrix transformation, and is separated to optimize its size and / or direction (steps S600 and S610).

Simplification theorem is performed on the separated transform matrix using the vector, and the linear signal processing matrix E is optimized by using Convex optimization technique (steps S630, S640, S650).

100: repeater system
110, 120: terminal
111, 121: antenna
130: Repeater
131-1 to 131-m: Repeater antenna

Claims (11)

A signal receiving step in which a repeater receives a signal from a plurality of terminals;
A transmission signal transmission step in which the repeater amplifies a reception signal received from the plurality of terminals through a linear signal processing matrix and simultaneously transmits the amplified transmission signal to the plurality of terminals; And
And a decoding step of the plurality of terminals decoding the transmission signal through a magnetic signal cancellation technique,
The transmission signal transmission step of the repeater amplifying the reception signals received from the plurality of terminals through a linear signal processing matrix and simultaneously transmitting the amplified transmission signals to the plurality of terminals,
Defining an alternative transformation matrix for simplifying the problem of maximizing transmission capacity of the plurality of terminals through spatial matrix transformation;
Separating to optimize the size or orientation of the alternative transformation matrix;
Performing a simplifying theorem on the separated alternative transformation matrix using the vector technique; And
And calculating the linear signal processing matrix by optimizing the simplified alternative transformation matrix by using the convolution optimization technique.
delete The method according to claim 1,
Wherein the linear signal processing matrix is calculated on the basis of algorithms of received signal processing and transmission signal processing.
The method according to claim 1,
Wherein the linear signal processing matrix is calculated based on algorithms of received signal processing, transmission signal processing, and power control.
The method according to claim 1,
Wherein the size of the linear signal processing matrix is M × M, and M is the number of antennas of the repeater. The method according to claim 1,
Wherein the channels are the same when the plurality of terminals transmit to the repeater and when they receive from the repeater.
A plurality of terminals; And
A repeater for amplifying a received signal received from the plurality of terminals through a linear signal processing matrix and transmitting the amplified transmission signal to the plurality of terminals simultaneously,
The plurality of terminals decode the transmission signal through a magnetic signal cancellation technique,
The linear signal processing matrix defines an alternative transformation matrix for simplifying the problem of maximizing the transmission capacity of the plurality of terminals through spatial matrix transformation, separates the optimal transformation matrix to optimize the size or direction of the alternative transformation matrix, And the simplified alternative matrix is optimized by using the Convex optimization technique to optimize the simplified alternative matrix.
8. The method of claim 7,
Wherein the linear signal processing matrix is calculated based on algorithms of received signal processing and transmission signal processing.
8. The method of claim 7,
Wherein the linear signal processing matrix is calculated based on algorithms of received signal processing, transmission signal processing, and power control.
8. The method of claim 7,
Wherein the size of the linear signal processing matrix is M × M, and M is the number of antennas of the repeater.
8. The method of claim 7,
Wherein the plurality of terminals transmit and receive the same channel to and from the repeater.
KR1020130038766A 2013-04-09 2013-04-09 Low complexity relay control method and system for two-ray amplify-and-forward system with with multiple antennas KR101400235B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101173940B1 (en) * 2007-06-01 2012-09-03 보드 오브 리전츠, 더 유니버시티 오브 텍사스 시스템 Apparatus and method for transmission and recepetion in multi input multi output system with relay
KR20130019125A (en) * 2011-08-16 2013-02-26 성균관대학교산학협력단 Cooperative stbc-ofdm signal relay method, reception method, relay apparatus, reception apparatus and transmission and reception system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101173940B1 (en) * 2007-06-01 2012-09-03 보드 오브 리전츠, 더 유니버시티 오브 텍사스 시스템 Apparatus and method for transmission and recepetion in multi input multi output system with relay
KR20130019125A (en) * 2011-08-16 2013-02-26 성균관대학교산학협력단 Cooperative stbc-ofdm signal relay method, reception method, relay apparatus, reception apparatus and transmission and reception system

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