CN104506478A - Time-variant multi-user MIMO-OFDM uplink linear iteration detector based on grouping - Google Patents

Time-variant multi-user MIMO-OFDM uplink linear iteration detector based on grouping Download PDF

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Publication number
CN104506478A
CN104506478A CN201510013012.2A CN201510013012A CN104506478A CN 104506478 A CN104506478 A CN 104506478A CN 201510013012 A CN201510013012 A CN 201510013012A CN 104506478 A CN104506478 A CN 104506478A
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group
signal
signals
interference
detector
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Inventor
束锋
顾晨
周叶
童娟娟
阙非
桂林卿
陆锦辉
张一晋
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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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
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0256—Channel estimation using minimum mean square error criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03821—Inter-carrier interference cancellation [ICI]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

The invention discloses a time-variant multi-user MIMO-OFDM uplink linear iteration detector based on grouping. For an MIMO-OFDM uplink, received signals are firstly divided into I groups identical in subcarrier number when a base station detects the signals, and then interference of the previous group of detected signals to each group of signals is eliminated when the group of signals is are detected. The time-variant multi-user MIMO-OFDM uplink linear iteration detector firstly adopts a minimum mean square error detecting algorithm to conduct in-group detection on each group of signals after grouping and then eliminates interference of the previous group of detected signals to each group of signals by means of a serial interference offset algorithm when the group of signals is are detected. The detection performance of each group of signals can be improved by means of the detecting algorithm after interference elimination, and accordingly the performance of the whole detector is improved.

Description

Time become multi-user MIMO-OFDM up link packet-based linear iteraction detector
Technical field
The present invention relates to wireless communication field, particularly become multi-user MIMO-OFDM up link packet-based linear iteraction detector during one.
Background technology
Input is the key technology realizing wireless communication system.Can correctly detect at receiving terminal and transmit, be the important indicator of a measurement performance in wireless communication systems.Detection algorithm can be equivalent to receiving terminal beam forming, can reduce the interference between multiple antennas and multi-user, thus recover primary signal.Detection algorithm can be divided into linear detection algorithm and non-linear detection algorithm, the comparatively classical linear least square of linearity test method (LS), minimize mean square error (MMSE) etc., these two kinds of detectors can be applied in MIMO and MIMO-OFDM system, although the two computational process is simple but performance is very limited, and along with the increase of mimo system antenna number or the increase of ofdm system sub-carrier number, the computation complexity of these two kinds of linear detection algorithm also can correspondingly increase.By contrast, Interference Cancellation detects thought can obtain more superior performance, such as counteracting serial interference (SIC) multiuser detection algorithm, Parallel Interference Cancellation (PIC) detection algorithm etc., they do not follow the order first detecting rear demodulation, but detection and demodulating process alternating iteration are carried out, namely the signal obtained is detected to back and carry out demodulation, demodulation result is fed back to the input of detector to detecting use next time, therefore back detection perform will have influence on the detection perform of current generation.But in MIMO-OFDM system, along with the increase of antenna number and total number of sub-carriers, channel matrix dimension increases, and makes the complexity of detection algorithm sharply increase, and is that linear detection algorithm or the complexity of interference cancellation algorithm all can increase thereupon.
Therefore, a kind of new method is needed to solve input problem.
Summary of the invention
Object of the present invention becomes the packet-based linear iteraction detector of multi-user MIMO-OFDM up link, to obtain the good compromise of detector performance and complexity when aiming to provide one.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
First the frequency-region signal that MIMO-OFDM system base-station receives is divided into the identical I group of sub-carrier number, according to mean square error detector is minimized in the group that calculating is often organized, and initialization y 0=y, loop initialization frequency n=1.Then calculate || G ii|| 2, and sort from big to small, and the deck label set φ of record ordering result, this step is intended to preferentially detect good group of channel conditions.3rd step detects φ (n) and organizes signal, namely deduct φ (n) when detection φ (n+1) Received signal strength and organize the interference of signal to it, even make n=n+1.Finally repeat above-mentioned detecting step, until all signals are detected.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
Adopt time become multi-user MIMO-OFDM up link packet-based linear iteraction detector, because it utilizes the detection thought of counteracting serial interference, therefore last group of signal eliminating before input and detected often is organized to its interference, therefore compared with linear detection algorithm, its detection perform is improved.Meanwhile, for the feature that broadband system complexity is higher, propose the thought of carrying out interblock interference to received signal, significantly reduce detection complexity, between detection perform and complexity, achieve good compromise.
The aspect that the present invention adds and advantage will part provide in the following description, and these will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Fig. 1 is according to the present invention's system schematic.
Fig. 2 is the flow chart of counteracting serial interference algorithm.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Become multi-user MIMO-OFDM up link packet-based linear iteraction detector when the present invention is a kind of to comprise: utilize the thought of grouping effectively to reduce complexity, the detection method of recycling counteracting serial interference improves the performance of detector.
Preferably, according to the thought of grouping, first the frequency-region signal that MIMO-OFDM system base-station receives is divided into the identical I group of sub-carrier number.
Preferably, according to mean square error detector is minimized in the group that calculating is often organized, and initialization y 0=y, loop initialization frequency n=1.Then calculate || G ii|| 2, and sort from big to small, and the deck label set φ of record ordering result, this step is intended to preferentially detect good group of channel conditions.3rd step detects φ (n) and organizes signal, namely deduct φ (n) when detection φ (n+1) Received signal strength and organize the interference of signal to it, even make n=n+1.Finally repeat above-mentioned detecting step, until all signals are detected.
As shown in Figure 1, after the frequency-region signal received by MIMO-OFDM system base-station is divided into the identical I group of sub-carrier number, minimizing after mean square error detects to often organizing in signal group, then adopting counteracting serial interference method that the signals revivification obtained is become the primary signal of respective user.
As shown in Figure 2, detect and carry out with demodulating process alternating iteration, namely the signal obtained is detected to back and carry out demodulation, demodulation result be fed back to the input of detector to detecting use next time, deducting one group of signal to its interference when detecting this signal, having improve the performance of detector.
The present invention adopts the detection thought of counteracting serial interference, detection and demodulating process alternating iteration are carried out, namely the signal obtained is detected to back and carry out demodulation, demodulation result is fed back to the input of detector to detecting use next time, effectively can reduce interference, improve the performance of detector.Because subcarrier whole detection method complexity is higher, therefore, invention introduces the thought that subcarrier grouping detects, obtain compromise good between detection perform and algorithm complex.

Claims (3)

1. one kind time become multi-user MIMO-OFDM up link packet-based linear iteraction detector, it is characterized in that: first base station received signal is divided into groups, adopt when detecting and often organizing signal in minimum mean-squared error algorithm algorithm suppression group and disturb, the upper one group of signal detected is eliminated the interference of this group by recycling counteracting serial interference method, the detection perform often organized can be improved, thus improve the performance of whole detection device.
2. become multi-user MIMO-OFDM up link packet-based linear iteraction detector time according to claim 1, it is characterized in that: the concrete steps that the counteracting serial interference based on subcarrier grouping detects are as follows:
Step 1), first the signal received is divided into the identical I group of sub-carrier number, according to mean square error detector is minimized in the group that calculating is often organized, and initialization y 0=y, loop initialization frequency n=1.
Wherein, G iibe the equivalent channel matrix that i-th group of signal is corresponding, G ii'be i-th ' group signal is to the equivalent channel matrix of the interference correspondence of i-th group of signal.W ibe the monitoring matrix of i-th group, y is the signal received, σ 2for noise variance.
Step 2), calculate || G ii|| 2, and sort from big to small, and the deck label set φ of record ordering result, this step is intended to preferentially detect good group of channel conditions.
Step 3), detect φ (n) and organize signal, namely
Step 4), in φ (n+1) Received signal strength, deduct φ (n) organize the interference of signal to it, even
y φ ( n + 1 ) = y φ ( n ) - G φ ( n + 1 ) φ ( n ) s ^ φ ( n ) , Make n=n+1.
Step 5), repeat step 3 and 4, until n=I, stop circulation.
3. become multi-user MIMO-OFDM up link packet-based linear iteraction detector time according to claim 1, it is characterized in that: the frequency-region signal that MIMO-OFDM system base-station receives is divided into the I group that sub-carrier number is identical.
CN201510013012.2A 2015-01-09 2015-01-09 Time-variant multi-user MIMO-OFDM uplink linear iteration detector based on grouping Pending CN104506478A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105680984A (en) * 2015-05-11 2016-06-15 南京理工大学 Alternating group iterative detection method for broadband multiuser MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system
CN112702103A (en) * 2020-11-11 2021-04-23 山东星通易航通信科技有限公司 VDES uplink received signal detection method based on serial interference elimination

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CN1429433A (en) * 2000-03-15 2003-07-09 交互数字技术公司 Multi-user detection using an adaptive combination of joint detection and successive interference cancellation
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Patent Citations (2)

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CN1429433A (en) * 2000-03-15 2003-07-09 交互数字技术公司 Multi-user detection using an adaptive combination of joint detection and successive interference cancellation
US20130126713A1 (en) * 2011-11-04 2013-05-23 The University Court Of The University Of Edinburgh Communication apparatus and method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105680984A (en) * 2015-05-11 2016-06-15 南京理工大学 Alternating group iterative detection method for broadband multiuser MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system
CN112702103A (en) * 2020-11-11 2021-04-23 山东星通易航通信科技有限公司 VDES uplink received signal detection method based on serial interference elimination

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Application publication date: 20150408