CN107070451A - Device A DC precision collocation methods in a kind of extensive mimo system - Google Patents
Device A DC precision collocation methods in a kind of extensive mimo system Download PDFInfo
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- CN107070451A CN107070451A CN201710030997.9A CN201710030997A CN107070451A CN 107070451 A CN107070451 A CN 107070451A CN 201710030997 A CN201710030997 A CN 201710030997A CN 107070451 A CN107070451 A CN 107070451A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/002—Provisions or arrangements for saving power, e.g. by allowing a sleep mode, using lower supply voltage for downstream stages, using multiple clock domains or by selectively turning on stages when needed
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/1205—Multiplexed conversion systems
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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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses device A DC precision collocation methods in a kind of extensive mimo system.It is that the DAC and ADC of the low precision of each antenna element configuration are capable of the overall power of effective controlling transmission system because number of antennas is huge in extensive mimo system.The present invention considers downlink, it is the every bit quantization DAC of antenna configuration low-power consumption 1 as the extensive antenna base station of transmitting terminal, given system target data rate, the present invention can calculate the receiving terminal ADC optimum precisions for determining to meet targeted rate requirement according to the fixed system such as antenna for base station and terminal device number parameter.The present invention calculates simple, can realize aims of systems performance with minimum power consumption cost, has directive significance to the configuration of extensive mimo system and hardware design.
Description
Technical field
The present invention relates to a kind of extensive MIMO (multiple-input and multiple-output) devices in system ADC (AD conversion unit) precision
Collocation method, belongs to wireless communication technology.
Background technology
In recent years, in order to adapt to the mobile data transfer needs being skyrocketed through, wireless communication system is in the urgent need to improving frequency
Compose efficiency of transmission.MIMO, i.e., use multiple transmitting antennas and reception antenna in transmitting terminal and receiving terminal, can make full use of respectively
Space resources suppresses channel fading, in the case where not increasing frequency spectrum resource and overall emitted power, significantly improves the letter of system
Road capacity, with obvious advantage.The extensive MIMO technology proposed on this basis turns into Next-Generation Wireless Communication Systems
The key components of (5G).The technology substantially increases wireless signal by configuring hundreds of or even thousands of antennas to base station
The spatial degrees of freedom of transmission, so as to improve the spectrum efficiency and channel capacity of system by space division multiplexing.In multi-user
In MIMO scheme, multiple single-antenna subscribers are served in a base station simultaneously, and multiple data flows can simultaneously be passed between base station and user
It is defeated.As long as antenna for base station number is more than number of users, each user remains able to obtain considerable spatial degrees of freedom.
However, the growth of number of antennas also improves hard-wired complexity simultaneously.In the downlink, each base station
Transmitting antenna needs to configure a DAC (D/A conversion unit), and each terminal reception antenna needs to configure an ADC.Therefore, firmly
Part cost and power consumption cost quickly increase with the increase of number of antennas.Which greatly limits extensive MIMO application.Pin
To this problem, mainly there are two kinds of solutions at present.One is the number for reducing DAC and ADC, uses mixing transceiver to reduce
Radio frequency link, such as in the advanced row digital precode of transmitting terminal, then carry out digital-to-analogue conversion, then carries out simulation precoding.Numeral
Precoding is still using methods such as traditional broken zero (ZF), maximal ratio transmission (MRT) precodings, and simulating precoding then needs
Design in addition.When carrying out beam forming, the lower limit of radio frequency link number is the number of actual transmissions data stream, and beam forming
The upper limit of gain is determined by number of antennas；Two be the precision for reducing DAC and ADC, even only with 1 bit under extreme case
DAC and ADC, because DAC and ADC power consumption increases with the increase of quantified precision bit number into index percent.At present mostly
Scheme is all individually to consider low precision DAC or ADC.Therefore, joint considers the precision allocation problem of the two, especially the two precision
Balance, the design of real system tool is of great significance.If both the above scheme is combined, it becomes possible to simultaneously
The power consumption of extensive mimo system is reduced in terms of two.
When transmitting terminal configures the DAC of 1 bit, the ADC of receiving terminal configuration infinite precision is not just necessary.Because low
The ADC of precision can also obtain the message transmission rate for approaching maximum, and power consumption can reduce many than infinite precision ADC.Change and
Yan Zhi, ADC precision need to be weighed between system transmission performance and hardware, power consumption cost.According to specific data rate
It is required that the precision to design receiving terminal ADC, realizes there is very important directive significance to system.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention is provided in a kind of extensive mimo system
Device A DC precision configuration calculation method, the precision Configuration Values that this method calculates ADC can minimize letter in Transmission system
The power consumption of number quantization modules, greatly reduces the overall power of large-scale antenna array system.
Technical scheme：To achieve the above object, the technical solution adopted by the present invention is：Including step：
(1) theoretical according to Bussang, the bit DAC of Base Transmitter antenna configuration 1, terminal reception antenna configures preferable nothing
When limiting Precision A/D C, the received signal to noise ratio γ of each user in downlinkidealFor：
Wherein, ρDAC=0.3634, represent affecting parameters of the 1 bit quantization DAC to received signal to noise ratio；Antenna for base station number
For N, terminal single-antenna subscriber number is M, and transmission power is P, and receiving terminal thermal noise power is N0；
(2) according to Bussang theories and step (1), the bit DAC of Base Transmitter antenna configuration 1, the configuration of terminal reception antenna
Quantizing bit number is kADCLow Precision A/D C when, the received signal to noise ratio γ of each user is in downlink：
Wherein, kADC>=3, ρ represent decay factors of the low Precision A/D C to received signal to noise ratio；ρ and kADCRelation be：
(3) when target data rate is η times of ideal rate, according to shannon formula, have
Log (1+ γ)=η log (1+ γideal)
Formula (2) is substituted into, decay factor ρ can be solved：
(4) obtained by step (3) after ρ, further according to the configuration required for formula (3) computing terminal reception antenna ADC precision
Value kADC：
Wherein,Expression rounds up.
Beneficial effect：Device A DC precision collocation method in the extensive mimo system that the present invention is provided, relative to existing
Technology, with following advantage：1st, the present invention configures 1 bit DAC premise from the extensive mimo system overall situation in transmitting terminal
Under, balance message transmission rate and system hardware, power consumption cost determine receiving terminal ADC precision, result in total optimization
Performance；2nd, the present invention is approximately linear to the non-linear effects of user data rate by DAC and ADC quantified precisions, simplifies and asks
Solution preocess, reduces computation complexity；3rd, antenna for base station number N, number of users M, transmission power P, noise power in the present invention
N0Value is flexible；Therefore, the program is applied to the extensive mimo system of multi-user under any signal to noise ratio；4th, the present invention is for reality
The design of border system has important value；Under given data rate requirement, the present invention can quickly determine ADC precision,
The performance of demand is obtained with minimum power consumption cost.
Brief description of the drawings
Fig. 1 is transmitting terminal, the receiving terminal block diagram of extensive mimo system in the present invention；
The schematic diagram that Fig. 2 is handled signal for low Precision A/D C in the present invention in receiving terminal；
Under Fig. 3 is specified criteria, the signal changed according to the obtained ADC precision of present invention calculating with target data rate
Figure；
Under Fig. 4 is specified criteria, the schematic diagram changed according to the obtained ADC precision of present invention calculating with signal to noise ratio.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 illustrates transmitting terminal, the receiving terminal block diagram of extensive mimo system in the present invention.In transmitting terminal, initial data
M symbol is generated through ovennodulation, then N number of complex signal, the real part of each complex signal, imaginary part difference is produced by precoding
Analog signal is produced by DAC, is eventually passed after radio frequency link (RF) by the transmitting of N roots antenna.In receiving terminal, M single antenna is used
Family is respectively received signal, after radio frequency link is handled, then obtains data signal through ADC processing, eventually passes demodulation
Recover initial data.
Fig. 2 illustrates the operating process of the low Precision A/D C docking collection of letters number, ADC precision kADCFor 1 bit, transmitting antenna number
N is 32, and number of users M is 8.Signal y is reception signal after radio frequency link is handled in figure, as can be seen from the figure y-
It is continuously distributed between 5~10；Signal yqFor the output signal after ADC is handled, as can be seen from the figure yqOnly 2 kinds values.
Obviously, the processing through too low Precision A/D C, receives signal and generates distortion, and kADCSmaller, distortion is more serious.Therefore, in order to drop
Low system power dissipation and use low Precision A/D C, can on system transmission performance produce influence.Specifically, transmission rate can be lowered.
Fig. 3 is given in signal to noise ratio P/N0Under conditions of=0dB, N=128, M=8, target data rate is respectively ideal
Speed 0~100% when, calculate obtained ADC precision according to the algorithm of the present invention.It can be seen that if it is desired that number
0~39%, ADC of ideal rate precision is reached according to speed all will at least reach 1 bit；If reaching 40%~76%,
Then at least want 2 bits；If reaching 77%~93%, 3 bits are at least reached；If reaching 94%~98%,
At least to reach 4 bits.Calculate kADCComprise the following steps that：
(1) by N=128, M=8, signal to noise ratio P/N0=0dB, calculating obtains 1 bit DAC of configuration and preferable infinite precision
During ADC, the received signal to noise ratio γ of each user in downlinkideal, formula is：
Wherein, ρDAC=0.3634, represent affecting parameters of the 1 bit quantization DAC to received signal to noise ratio.
(2) according to Bussang theories and step (1), the bit DAC of Base Transmitter antenna configuration 1, the configuration of terminal reception antenna
Quantizing bit number is kADCLow Precision A/D C when, the received signal to noise ratio γ of each user is in downlink：
Wherein, kADC>=3, ρ represent decay factors of the low Precision A/D C to received signal to noise ratio；ρ and kADCRelation be：
(3) when target data rate is η times of ideal rate, according to shannon formula, there are log (1+ γ)=η log (1+
γideal), target data rate η and formula (2) are substituted into formula, decay factor ρ is calculated, formula is：
(4) ρ and formula (3) computing terminal reception antenna obtained by step (2) ADC precision kADC, formula is：
Wherein,Expression rounds up.
Fig. 4 is given under conditions of N=128, M=8, and target data rate η is respectively 50%, 70%, when 90%, this hair
It is bright to calculate obtained ADC precision kADCWith signal to noise ratio P/N0The schematic diagram of change.P/N0Scope be -15dB to 15dB.From figure
As can be seen that for identical target data rate η, signal to noise ratio is higher, kADCValue is bigger.Illustrate in systems in practice, noise
Than higher, the requirement to hardware such as ADC is higher.
The present invention is from the extensive mimo system overall situation, on the premise of transmitting terminal configures 1 bit DAC, according to step
(1) the ADC precision k that-(4) are obtainedADC, it is to ensure that data rate reaches η γidealUnder conditions of, minimum precision.Precision is got over
Small, hardware, power consumption cost are smaller.Therefore present invention balance message transmission rate and system hardware, power consumption cost, with it is minimum into
Originally targeted rate is realized.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (1)
1. device A DC precision collocation methods in a kind of extensive mimo system, it is characterised in that：Including step：
(1) theoretical according to Bussang, the bit DAC of Base Transmitter antenna configuration 1, terminal reception antenna configuration is preferably unlimited smart
When spending ADC, the received signal to noise ratio γ of each user in downlinkidealFor：
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Wherein, ρDAC=0.3634, represent affecting parameters of the 1 bit quantization DAC to received signal to noise ratio；Antenna for base station number is N,
Terminal single-antenna subscriber number is M, and transmission power is P, and receiving terminal thermal noise power is N0；
(2) according to Bussang theories and step (1), the bit DAC of Base Transmitter antenna configuration 1, terminal reception antenna configuration quantifies
Bit number is kADCLow Precision A/D C when, the received signal to noise ratio γ of each user is in downlink：
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Wherein, kADC>=3, ρ represent decay factors of the low Precision A/D C to received signal to noise ratio；ρ and kADCRelation be：
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(3) when target data rate is η times of ideal rate, according to shannon formula, obtain
Log (1+ γ)=η log (1+ γideal)
Formula (2) is substituted into, decay factor ρ is solved：
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(4) obtained by step (3) after ρ, further according to the Configuration Values required for formula (3) computing terminal reception antenna ADC precision
kADC：
Wherein,Expression rounds up.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365873A (en) * | 2018-01-12 | 2018-08-03 | 东南大学 | Using the extensive MIMO adaptive transmission methods of low Precision A/D C millimeter waves |
| CN110176950A (en) * | 2019-04-22 | 2019-08-27 | 江苏大学 | A kind of extensive mimo system uplink optimum quantization bit number calculation method of low Precision A/D C |
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| WO2006112030A1 (en) * | 2005-04-14 | 2006-10-26 | Matsushita Electric Industrial Co., Ltd. | Wireless reception apparatus and wireless reception method |
| CN101547066A (en) * | 2008-03-25 | 2009-09-30 | 中兴通讯股份有限公司 | MU-MIMO mode-based method for indicating downlink precoding information |
| CN101621321A (en) * | 2008-06-30 | 2010-01-06 | 三星电子株式会社 | Closed loop constant modulus multi-user MIMO system and a control signaling processing method thereof |
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| WO2006112030A1 (en) * | 2005-04-14 | 2006-10-26 | Matsushita Electric Industrial Co., Ltd. | Wireless reception apparatus and wireless reception method |
| CN1770672A (en) * | 2005-10-21 | 2006-05-10 | 北京交通大学 | Space-time block code MT-CDMA system uplink transmitting and receiving method |
| CN101547066A (en) * | 2008-03-25 | 2009-09-30 | 中兴通讯股份有限公司 | MU-MIMO mode-based method for indicating downlink precoding information |
| CN101621321A (en) * | 2008-06-30 | 2010-01-06 | 三星电子株式会社 | Closed loop constant modulus multi-user MIMO system and a control signaling processing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365873A (en) * | 2018-01-12 | 2018-08-03 | 东南大学 | Using the extensive MIMO adaptive transmission methods of low Precision A/D C millimeter waves |
| CN108365873B (en) * | 2018-01-12 | 2021-03-23 | 东南大学 | Large-scale MIMO self-adaptive transmission method adopting low-precision ADC millimeter waves |
| CN110176950A (en) * | 2019-04-22 | 2019-08-27 | 江苏大学 | A kind of extensive mimo system uplink optimum quantization bit number calculation method of low Precision A/D C |
| CN110176950B (en) * | 2019-04-22 | 2021-08-03 | 江苏大学 | Method for calculating optimal quantization bit number of uplink of low-precision ADC large-scale MIMO system |
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