KR101764528B1 - Method of receiving multiple signals using single analog-to-digital converter based on multiple antennas - Google Patents

Abstract

A method for receiving multiple signals via a single antenna based on multiple antennas and an apparatus for performing the same are disclosed. A communication method of a communication apparatus according to an embodiment includes generating a primary conversion reception signal based on channel information and a reception signal received from each of a plurality of antennas, And converting the secondary conversion received signal to a digital signal via a single ADC.

Description

Field of the Invention [0001] The present invention relates to a method for receiving multiple signals through a single ADC based on multiple antennas,

The following embodiments are directed to a method for receiving multiple signals via a single antenna based on multiple antennas and an apparatus for performing the same.

In general, a MIMO system is a technology for transmitting signals by installing two or more antennas in a transmitter and a receiver of a communication system. Since different signals can be transmitted in the same band for each antenna, Of the system.

Meanwhile, in order to implement the MIMO system in the conventional communication system, a transceiver is constructed by configuring several antennas and several RF lines. Each RF line includes a modulator / demodulator, an ADC, an oscillator, and an AMP.

Since various elements are used for the RF line, the RF line is large and expensive. Especially, in N x N MIMO systems, as N increases, the number of RF lines increases, so the price and size of the transceiver increases.

Embodiments may provide a technique for receiving multiple signals received by multiple receive antennas with one ADC.

A communication method of a communication apparatus according to an embodiment includes generating a primary conversion reception signal based on channel information and a reception signal received from each of a plurality of antennas, And converting the secondary conversion received signal to a digital signal via a single ADC.

The step of generating the primary conversion reception signal may include generating at least one of the magnitude and phase of the reception signal received from each of the plurality of antennas to generate the primary conversion reception signal.

The step of generating the secondary conversion reception signal may include generating the secondary conversion reception signal by summing each product of the primary conversion reception signal and each weight product corresponding to each element.

The transforming may include demodulating the secondary transform received signal through a Successive Interference Cancellation (SIC) operation.

A communication apparatus according to an exemplary embodiment includes a plurality of antennas and an ADC and generates a primary conversion reception signal based on channel information and a reception signal received from each of the plurality of antennas, A controller for generating a secondary conversion reception signal based on the signal and the weight, and converting the secondary conversion reception signal to a digital signal through the ADC, wherein the ADC can be single.

The controller may further include a signal separation module for generating at least one of a magnitude and a phase of a reception signal received from each of the plurality of antennas to generate the primary conversion reception signal.

The signal separation module may include a plurality of attenuators for changing the magnitude and a plurality of phase converters for changing the phase.

The controller may include a weight integration module for generating the secondary conversion reception signal by summing each product of the primary conversion reception signal and each weight corresponding to each element.

The ADC can demodulate the secondary conversion received signal through a successive interference cancellation (SIC) operation.

1 is a schematic block diagram of a communication system according to one embodiment.
Fig. 2 is a schematic configuration diagram of the second communication apparatus shown in Fig. 1. Fig.
Fig. 3 is a flowchart for explaining an operation method of the second communication apparatus shown in Fig. 1. Fig.

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are presented for the purpose of describing embodiments only in accordance with the concepts of the present invention, May be embodied in various forms and are not limited to the embodiments described herein.

Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

The terms first, second, or the like may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, Similarly, the second component may also be referred to as the first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ", or" having ", or the like, specify that there is a stated feature, number, step, operation, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

Unless defined otherwise, 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 meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. Like reference symbols in the drawings denote like elements.

A module in this specification may mean hardware capable of performing the functions and operations according to the respective names described in this specification and may mean computer program codes capable of performing specific functions and operations , Or an electronic recording medium, e.g., a processor or a microprocessor, having computer program code embodied thereon to perform particular functions and operations.

In other words, a module may mean a functional and / or structural combination of hardware for carrying out the technical idea of the present invention and / or software for driving the hardware.

1 is a schematic block diagram of a communication system according to one embodiment.

Referring to FIG. 1, a communication system 10 may include a first communication apparatus 100 and a second communication apparatus 200.

The communication system 10 can perform communication in a wireless communication environment. For example, the communication system 10 may be implemented in 3GPP (3 ^rd Generation Partnership Project), Long-Term Evolution (LTE), LTE-Advanced (LTE-A), 3GPP2 and World Interoperability for Microwave Access have.

At this time, the communication system 10 may be a system that performs communication through a channel. That is, the first communication device 100 and the second communication device 200 can communicate with each other through a channel between the first communication device 100 and the second communication device 200. [

Each of the first communication device 100 and the second communication device 200 may be implemented as at least one of a base station, a relay station, and a terminal. The base station may be a mobile station, a fixed station, a Node-B, an eNode-B, a BTS (Base Transceiver System), an access point Can be called. Also, the terminal may be a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a wireless terminal, an access terminal (AT), a subscriber unit, A subscriber station (SS), a wireless device, a wireless communication device, a wireless transmit / receive unit (WTRU), a mobile node, or a mobile.

The terminal may be implemented as a portable electronic device. The portable electronic device may be a laptop computer, a mobile phone, a smart phone, a tablet PC, a mobile internet device (MID), a personal digital assistant (PDA), an enterprise digital assistant A digital still camera, a digital video camera, a portable multimedia player (PMP), a personal navigation device or a portable navigation device (PND), a handheld game console, an e-book, or a smart device. For example, a smart device can be implemented as a smart watch or a smart band.

The first communication device 100 may be a transmission apparatus, i.e., a base station, and the second communication apparatus 200 may be a receiving apparatus, i.e., a terminal.

The first communication device 100 may include a plurality of transmission antennas T-ANT and the second communication device 200 may include a plurality of reception antennas R-ANT. The number of the plurality of transmission antennas T-ANT may be m, and the number of the plurality of reception antennas R-ANT may be n. For example, m and n may be the same or different.

That is, each of the first communication device 100 and the second communication device 200 may be a communication device based on a Multiple-Input Multiple-Output (MIMO) antenna system.

Hereinafter, for convenience of explanation, it is assumed that both the first communication device 100 and the second communication device 200 know the channel information.

The first communication apparatus 100 transmits, based on the channel information,

And the channel

To the second communication device 200 via the second communication device 200. Transmission signal

Is expressed as Equation (1), and the channel

Can be expressed as Equation (2) through a Singular Value Decomposition (SVD) process.

here,

Wow

May be a unitary matrix. That is, the first communication apparatus 100 transmits information (or data)

Channel

The transmission signal < RTI ID = 0.0 >

And transmit it to the second communication device 200 through a plurality of transmission antennas (T-ANT).

The second communication device 200 can receive signals transmitted from the first communication device 100 via a plurality of antennas R-ANT.

The second communication apparatus generates a primary conversion reception signal based on the channel information and the reception signal received from each of the plurality of antennas (R-ANT), and generates a secondary conversion reception signal based on the primary conversion reception signal and the weight, Lt; / RTI > Thereafter, the second communication device 200 can convert the secondary conversion received signal to a digital signal through a single ADC.

Fig. 2 is a schematic configuration diagram of the second communication apparatus shown in Fig. 1. Fig.

Referring to FIGS. 1 and 2, the second communication device 200 may include a plurality of antennas and a controller 210.

The controller 210 may include a signal separation module 230, a weight integration module 250, an ADC 270, and a demodulator 290.

[Post-processing process of receiving system]

The second communication device 200 includes a plurality of antennas < RTI ID = 0.0 >

Can be expressed by Equation (3).

here,

May mean noise.

The transmission signal transmitted from each of the plurality of transmission antennas of the first communication apparatus 100

Can be expressed as Equation (1), Equation (3) can be expressed again as Equation (4).

The signal separation module 230 receives the channel information and the received signal

The primary conversion reception signal < RTI ID = 0.0 >

Lt; / RTI > For example, the signal separation module 230 may receive

Can be linearly transformed as shown in Equation (5).

Received signal

on

The reception signal received from each reception antenna

Lt; RTI ID = 0.0 > a < / RTI > particular size and phase. That is, the signal separation module 230 receives the reception signal from each of the plurality of reception antennas

Can be changed. For example, the signal separation module 230 may comprise a plurality of attenuators and a plurality of phase shifters.

The signal separation module 230 receives the primary conversion reception signal

To the weight integration module 250.

Primary conversion received signal

And each signal may be expressed by Equation (6).

here,

Channel

May mean a singular value of < RTI ID = 0.0 > That is, the primary conversion reception signal

≪ / RTI >

Specific value of

And the transmission signal

. ≪ / RTI >

The weight integration module 250 receives the primary conversion reception signal

And weight

The second conversion reception signal < RTI ID = 0.0 >

Lt; / RTI >

The weight integration module 250 receives the primary conversion reception signal

Lt; RTI ID = 0.0 >

The received signal < RTI ID = 0.0 >

Can be converted.

Thereafter, the weight integration module 250 receives the primary-transformed received signal < RTI ID = 0.0 >

And outputs the weighted sum of the products of the second-order transformation received signal < RTI ID = 0.0 >

Lt; / RTI > That is, the secondary conversion reception signal

Can be expressed by Equation (8).

ADC 270 receives the secondary conversion received signal < RTI ID = 0.0 >

Can be converted into a discrete signal. That is, the secondary conversion reception signal

May be converted to a digital signal using a single ADC 270. [ At this time, the ADC 270 can have a high resolution.

The ADC 270 also receives the secondary conversion received signal < RTI ID = 0.0 >

Can be demodulated through a Successive Interference Cancellation (SIC) operation.

For example, the ADC 270 may demodulate the largest signal first by weight and singular value, and demodulate the signal in turn while removing the demodulated signal from the previous signal.

Assuming the largest case, the demodulation operation of the ADC 270 can be described as follows.

Secondary conversion received signal

Can be expressed as Equation (9) based on the first received signal.

In the high signal-to-noise ratio (SNR) region

Value can be ignored and the size of the received signal different from the size of the first received signal can be small. Thus, the ADC 270 can demodulate the first received signal.

The ADC 270 receives the demodulated signal

, For example, the first demodulated signal

The second conversion reception signal < RTI ID = 0.0 >

(10). ≪ / RTI >

As described above in the demodulation operation of the first received signal, the size of the other received signal and the size of the noise may be smaller than the size of the second received signal. Accordingly, the BAD ADC 270 can successfully demodulate the second received signal. The ADC 270 can demodulate the N received signals by repeatedly performing the demodulation operation described above.

By demodulating the signal in this manner, a plurality of signals can be received using a single ADC 270, and a multiplexing gain can be effectively obtained based on a single ADC 270.

That is, the present invention can receive a plurality of signals (or multiple signals) received from a plurality of antennas (R-ANT) using a single ADC 270 and a single RF element, thereby lowering the complexity of the system .

Fig. 3 is a flowchart for explaining an operation method of the second communication apparatus shown in Fig. 1. Fig.

Referring to FIG. 3, the signal separation module 230 may generate a primary conversion reception signal based on the channel information and the reception signals received from the plurality of antennas, respectively (S310).

The weight integration module 250 may generate a secondary conversion reception signal based on the primary conversion reception signal and the weight (S330).

A single ADC 270 may convert the secondary conversion received signal to a digital signal (S350).

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA) , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (9)

Generating a primary transform received signal based on the channel information of the channel and a received signal received from each of the plurality of antennas;
Generating a secondary conversion reception signal based on each element of the primary conversion reception signal and each weight corresponding to each element; And
Converting the secondary conversion received signal to a digital signal through a single ADC;
Lt; / RTI >
Wherein the step of generating the primary conversion received signal comprises:
Generating at least one of a magnitude and a phase of a reception signal received from each of the plurality of antennas to generate the primary conversion reception signal
Lt; / RTI >
Wherein the converting comprises:
Demodulates the received secondary signal by successive interference cancellation (SIC) operations in the order of large signals according to the weights and the singular values of the channels in the secondary transform received signal, Demodulating the signals constituting the secondary conversion reception signal in order while removing
The communication method comprising the steps of:
delete The method according to claim 1,
Wherein the step of generating the secondary conversion reception signal comprises:
Generating the secondary conversion reception signal by summing each product of the primary conversion reception signal and each weight product corresponding to each element,
The communication method comprising the steps of:
delete A plurality of antennas; And
An ADC and generates at least one of a magnitude and a phase of the received signal based on the channel information of the channel and the received signal received from each of the plurality of antennas to generate a first transform received signal, A controller for generating a secondary conversion reception signal based on each element of the reception signal and each weight corresponding to each element and for converting the secondary conversion reception signal into a digital signal through the ADC,
Lt; / RTI >
The ADC is single and demodulates in the order of large signals according to the weights and the singular values of the channels in the quadratic transform received signal through Successive Interference Cancellation (SIC) operation, And demodulates the signals constituting the secondary conversion reception signal in order while removing the demodulated signal from the secondary conversion reception signal.
delete 6. The method of claim 5,
The controller comprising:
A plurality of attenuators for varying the size; And
A plurality of phase converters
.
6. The method of claim 5,
The controller comprising:
A weight integration module for generating the secondary conversion reception signal by summing the products of the primary conversion reception signal and the respective weights corresponding to the respective elements,
Further comprising:
delete

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