CN107453793A - A kind of method of simplified MIMO receiver signal transacting - Google Patents

A kind of method of simplified MIMO receiver signal transacting Download PDF

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Publication number
CN107453793A
CN107453793A CN201710838322.7A CN201710838322A CN107453793A CN 107453793 A CN107453793 A CN 107453793A CN 201710838322 A CN201710838322 A CN 201710838322A CN 107453793 A CN107453793 A CN 107453793A
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CN
China
Prior art keywords
channel
signal
receiving
precoding
multipath
Prior art date
Application number
CN201710838322.7A
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Chinese (zh)
Inventor
王洁
张清洪
张建刚
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成都亿凌特科技有限公司
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Priority to CN201710838322.7A priority Critical patent/CN107453793A/en
Publication of CN107453793A publication Critical patent/CN107453793A/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; Arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks ; Receiver end arrangements for processing baseband signals
    • H04L25/03006Arrangements for removing intersymbol interference

Abstract

The present invention discloses a kind of method of simplified MIMO receiver signal transacting, comprises the following steps:Step 1:The transmitting terminal emission detection frame of UE sides, NB side joints, which receive, does channel estimation, obtains channel estimate matrix;Step 2:After NB sides obtain channel estimate matrix, according to sending and receiving channel reciprocity principle, the channel matrix can be done simple transformation, be placed on transmitting terminal and do precoding processing, step 3:After NB originating terminal signals carry out precoding, UE reception antenna is come by wireless channel, the signal that then receiving terminal receives is equivalent to the channel that have passed through an all-pass, the multipath of same signal is converged on same antenna port in synchronization, has reached the purpose for suppressing multipath and realizing signal energy convergence.The present invention is by receiving and dispatching reciprocity, channel precoding, it is suppressed that multipath effect, the signal that reception antenna receives are aggregation of the primary signal on room and time, realize greatly simplifying for receiver signal processing.

Description

A kind of method of simplified MIMO receiver signal transacting

Technical field

The present invention relates to wireless communication technology field, specially a kind of method of simplified MIMO receiver signal transacting.

Background technology

In current wireless communication system, realized by MIMO technology and proportionally increase transmission with transmission antenna quantity Capacity and attracted attention.As shown in figure 1, but receiving terminal there is also intersymbol interference (Inter-Symbol Interference, Abbreviation ISI) and interchannel interference (Inter-Channel Interference, abbreviation ICI), in order to effectively utilize these interference Signal simultaneously correctly demodulates, and the processing of MIMO technology is relatively complicated, and receiving terminal is higher to the accuracy requirement of channel estimation, together When relate to matrix operation, equalization algorithm, cause the processing complexity of MIMO receiver very high.

MIMO technology is concentrated mainly on following three field:

1st, precoding technique knows CSI (channel state information), it is necessary to realize, then in transmitting terminal The matrix for producing beamforming does precoding to signal, so as to improve received signal strength.But beamforming handles past It is past all more complicated.

2nd, Space Time Coding, can be mutually perpendicular to or not when being launched by each antenna of coding mode It is disturbed, so as to reduce error rate and improve channel capacity.

3rd, balancing technique, mainly based on linear equalization, ZF and MMSE algorithms be common are.Balancing technique is to suppress relevant A kind of effective technology of multipath and non-coherent multi pathway, but difficulty is big in structure and Project Realization, equalization algorithm is complicated, computing Amount also sharply increases with the increase of propagation path quantity, it is difficult to is used widely in high-speed radiocommunication system.

The content of the invention

Technical problem solved by the invention is to provide a kind of method of simplified MIMO receiver signal transacting, to solve The shortcomings that in above-mentioned background technology.

Technical problem solved by the invention is realized using following technical scheme:At a kind of simplified MIMO receiver signal The method of reason, comprises the following steps:

Step 1:The transmitting terminal emission detection frame of UE sides, NB side joints, which receive, does channel estimation, obtains channel estimate matrix;

Step 2:After NB sides obtain channel estimate matrix, according to sending and receiving channel reciprocity principle, the channel matrix can be done Simple transformation, it is placed on transmitting terminal and does precoding processing,

Step 3:After NB originating terminal signals carry out precoding, UE reception antenna is come by wireless channel, then receiving terminal is received To signal converge to same antenna port in synchronization equivalent to the channel that have passed through an all-pass, the multipath of same signal On, reach the purpose for suppressing multipath and realizing signal energy convergence, it is achieved thereby that signal demodulation, then UE side joints receiving ends is only Decoding is directly sent to after needing synchronization.

Beneficial effects of the present invention:By receiving and dispatching reciprocity, channel precoding, it is suppressed that multipath effect, reception antenna receive Signal be aggregation of the primary signal on room and time, realize receiver signal processing greatly simplify, to receiver The power consumption of equipment, the product of cost sensitivity have great importance.

Brief description of the drawings

Fig. 1 is the current transmitting of receiver, reception processing block diagram under normal circumstances;

Fig. 2 is this mimo system structural representation;

Fig. 3 is the precoding processing schematic diagram of NB sides in base station of the present invention;

Fig. 4 is the reception processing schematic diagram of UE sides of the present invention.

Embodiment

In order that the technical means, the inventive features, the objects and the advantages of the present invention are easy to understand, tie below Conjunction is specifically illustrating, and the present invention is expanded on further.

Embodiment:As shown in Fig. 2 a kind of method of simplified MIMO receiver signal transacting, comprises the following steps:

Step 1:The transmitting terminal emission detection frame of UE sides, NB side joints do channel estimation after receiving detection frame, obtain channel and estimate Matrix is counted, if doing time domain channel estimation, channel estimation is represented with h;If do channel estimation in frequency domain matrix, channel estimation Represented with H;

There is more modulation standard under MIMO structures, by taking MIMO-OFDM system architectures as an example.

Assuming that system has NTIndividual transmitting antenna, NRIndividual reception antenna, then serial information bit stream be decomposed into NTIndividual data flow Afterwards, independent mapping, coding, modulation are carried out, finally from NTIndividual antenna is sent out simultaneously.Then through ovennodulation and wireless on reception antenna Signal after channel impulse response can be expressed as:

Wherein, Hij[n, k] is the frequency response of k-th carrier channel between transmitting antenna i and reception antenna j;

wj[n, k] is the additive white Gaussian noise in upper k-th of the carrier channel of reception antenna j, and its average is 0, and variance is

Its frequency response isWherein K0Represent multipath number, WK=e-j(2π/K)

The criterion of channel estimation substantially has following 3 kinds:Least square method (LS), least mean-square error (MMSE), maximum is seemingly So (ML).Here by taking LS as an example:

Channel frequency response on i-th of transmitting antenna on k-th of subcarrier of moment n is:

The signal then received is

Above formula is equivalent to as follows:

Then represent have with the form of matrix

Wherein

SoIt can be estimated by following formula

Step 2:, can should according to sending and receiving channel reciprocity principle as shown in figure 3, after NB sides obtain channel estimate matrix Channel matrix does simple transformation, is placed on transmitting terminal and does precoding processing, pre-coding matrix is represented with W;Calculating process is as follows;

By the equation of transmission, by taking frequency domain as an example, it is that X is the signal sent, and H is channel response, and Y is to receive Signal;

Y=HX

The precoding coefficients selection H's of transmitting terminal is inverse, i.e.,

W=H-1

Step 3:After NB originating terminal signals carry out precoding, UE reception antenna is come by wireless channel, then receiving terminal is received To signal converge to same antenna port in synchronization equivalent to the channel that have passed through an all-pass, the multipath of same signal On, reach the purpose for suppressing multipath and realizing signal energy convergence, it is achieved thereby that the demodulation of signal.Then UE side joints receiving end Decoding is directly sent to after needing synchronization.The derivation of all-pass channel is as follows;

After precoding, the signal that UE is received is transmission signal, then as shown below, and receiving terminal need not do channel again Estimation and equilibrium treatment.

By the principle of sending and receiving channel reciprocity, precoding directly is done in transmitting terminal after channel estimate matrix is obtained in NB sides, Then for UE receiving terminals, signal is equivalent to the channel that have passed through an all-pass.I.e. the precoding mode causes signal transmitting During the conversion of amplitude and phase will not occur, it is achieved thereby that the suppression of multipath and frequency selective fading, is improved logical The transmission performance of letter system, a variety of communication systems such as MIMO, OFDM etc. can be applied.

It can be seen that if surveyed in NB with UE ends using above-mentioned steps, it is possible to which the channel for dispensing UE side joint receiving ends is estimated The complex modules such as meter, equilibrium treatment, it greatly simplify the realization of receiver, it is possible to which the process chip of selection more low performance is come Realize, so as to reduce the power consumption of receiver and cost.

The general principle and principal character and advantages of the present invention of the present invention, the technology of the industry has been shown and described above Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes Change and improvement all fall within the protetion scope of the claimed invention, the claimed scope of the invention by appended claims and its Equivalent thereof.

Claims (1)

1. a kind of method of simplified MIMO receiver signal transacting, it is characterized in that:Comprise the following steps:
Step 1:The transmitting terminal emission detection frame of UE sides, NB side joints, which receive, does channel estimation, obtains channel estimate matrix;
Step 2:After NB sides obtain channel estimate matrix, according to sending and receiving channel reciprocity principle, the channel matrix can be done simply Conversion, is placed on transmitting terminal and does precoding processing,
Step 3:After NB originating terminal signals carry out precoding, UE reception antenna is come by wireless channel, then receiving terminal receives Signal is converged on same antenna port equivalent to the channel that have passed through an all-pass, the multipath of same signal in synchronization, The purpose for suppressing multipath and realizing signal energy convergence is reached, it is achieved thereby that signal demodulation, then UE side joints receiving end only needs Decoding is directly sent to after wanting synchronization.
CN201710838322.7A 2017-09-18 2017-09-18 A kind of method of simplified MIMO receiver signal transacting CN107453793A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101521532A (en) * 2008-02-28 2009-09-02 大唐移动通信设备有限公司 Method for obtaining complete information of uplink channel, system and device thereof
CN102035615A (en) * 2009-09-27 2011-04-27 大唐移动通信设备有限公司 MIMO-based downlink data transmission method, device and system
CN102104404A (en) * 2009-12-21 2011-06-22 株式会社Ntt都科摩 Multi-user MIMO transmission method in wireless communication system, base station and user terminal
WO2016164058A1 (en) * 2015-04-08 2016-10-13 Ntt Docomo, Inc. Base station, user equipment, and method for determining precoding matrix

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101521532A (en) * 2008-02-28 2009-09-02 大唐移动通信设备有限公司 Method for obtaining complete information of uplink channel, system and device thereof
CN102035615A (en) * 2009-09-27 2011-04-27 大唐移动通信设备有限公司 MIMO-based downlink data transmission method, device and system
CN102104404A (en) * 2009-12-21 2011-06-22 株式会社Ntt都科摩 Multi-user MIMO transmission method in wireless communication system, base station and user terminal
WO2016164058A1 (en) * 2015-04-08 2016-10-13 Ntt Docomo, Inc. Base station, user equipment, and method for determining precoding matrix

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