CN108512788A - A kind of PCM modules based on noise shaping for digital mobile forward pass link - Google Patents
A kind of PCM modules based on noise shaping for digital mobile forward pass link Download PDFInfo
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- CN108512788A CN108512788A CN201810274285.6A CN201810274285A CN108512788A CN 108512788 A CN108512788 A CN 108512788A CN 201810274285 A CN201810274285 A CN 201810274285A CN 108512788 A CN108512788 A CN 108512788A
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- 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
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
- H04B14/046—Systems or methods for reducing noise or bandwidth
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- Computer Networks & Wireless Communication (AREA)
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
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Abstract
The invention discloses a kind of PCM modules based on noise shaping for digital mobile forward pass link, are related to light and wireless fusion access network field.The PCM modules include the quantizer and FIR filter for having backfeed loop, the quantizer forms the PCM modules based on noise shaping with FIR filter, the PCM modules based on noise shaping can change the frequency domain distribution of base band OFDM signal generated quantizing noise when by quantizer, quantization noise power is reduced in data modulated subcarriers, and power increases in non-data modulated sub-carriers.The present invention, which can be reduced effectively, demodulates data error vector amplitude caused by quantizing noise, it realizes spectral efficient, high-quality transmission, solves the problems, such as in digital mobile forward pass signal transmission spectrum efficiency (quantizing bit number) contradiction between transmission quality between BBU and RRH.
Description
Technical field
The present invention relates to light and wireless fusion to access network field, is specifically that one kind being used for digital mobile forward pass link
PCM (Pulse Code Modulation, pulse code modulation) module based on noise shaping.
Background technology
Centralized Radio Access Network (C-RAN) is a kind of based on centralization processing (Centralized
Processing), collaborative radio (Collaborative Radio) and real-time cloud computing framework (Real-time Cloud
Infrastructure green wireless access network framework (Clean system)).Its essence is to reduce base station machine by realization
Room quantity reduces energy consumption, using Collaborative, virtualization technology, realizes resource-sharing and dynamic dispatching, improves spectrum efficiency, with
Reach low cost, the operation of high bandwidth and flexibility ratio.
In C-RAN, baseband processing module (BBU, Base band Unit) and far end radio frequency head (RRH, Remote
Radio Head) between mobile forward pass is referred to as by the part of optical fiber link connection.Existing mobile forward pass using based on
The digital light-carried wireless of common public radio interface (CPRI, Common Public Radio Interface) digital signal
Technology (D-RoF, Digital-radio over fiber), by LTE (Long Term Evolution, the general shifting at the ends BBU
The long term evolution of the dynamic communication technology) signal quantified by the 15bit of I/Q two-way, become binary OOK (On-Off
Keying, binary system on off keying) signal, then pass through intensity modulated/directly detection (IM/DD, Intensity
Modulation/Direct Detection) it is transmitted by optical fiber.Such spectrum efficiency will reduce, to fiber channel
Bandwidth demand will improve, and be improved with the rate of the ends BBU wireless signal, the requirement of sun adjuster part and bandwidth is with regard to higher and higher.
On the one hand, quantizing noise can be reduced by increasing quantizing bit number, to ensure high-quality transmission, but due to needing more bits,
Spectrum efficiency is caused to reduce；On the other hand, spectrum efficiency can be promoted by reducing quantizing bit number, but can increase quantizing noise,
Cause transmission quality impaired.This contradiction how is solved, is urgently to be resolved hurrily in generation digital movement forward pass link important ask
Topic.
Invention content
In view of the deficiencies in the prior art, the purpose of the present invention is to provide one kind being used for digital mobile forward pass link
The PCM modules based on noise shaping, can effectively reduce demodulation data error vector amplitude caused by quantizing noise (EVM,
Error Vector Magnitude), realize spectral efficient, high-quality transmission.
To achieve the above objectives, the technical solution adopted by the present invention is that：It provides a kind of for digital mobile forward pass link
PCM modules based on noise shaping, the PCM modules include：Quantizer with backfeed loop and FIR filter, the quantization
Device forms the PCM modules based on noise shaping with FIR filter, and baseband OFDM can be changed by being somebody's turn to do the PCM modules based on noise shaping
The frequency domain distribution of signal generated quantizing noise when by quantizer, by quantization noise power in data modulated subcarriers
It reduces, and power increases in non-data modulated sub-carriers.
Based on the above technical solution, the PCM modules based on noise shaping include：One quantizer, one
FIR filter and two adders；The signal e [n] for first entering quantizer obtains quantized signal after quantizer is handled
eq[n], n are the serial number of input signal；One adder will quantify front and back signal subtraction, obtain signal q [n] (q [n]=eq
[n]-e [n]), then signal q [n] is sent to FIR filter；Signal q is obtained after FIR filter is filteredf[n]；
Another adder is by signal qf[n] is added with base band OFDM signal s [n], obtains the signal that subsequent time is input to quantizer.
Based on the above technical solution, the signal qf[n] meets claimed below：
qf[n]=a1q[n-1]+a2q[n-2]+…+aMq[n-M]；
Wherein, M is the exponent number of filter, for the positive integer more than or equal to 1 and less than n；ai(i=1,2 ..., M) is default
FIR filter coefficient.
Based on the above technical solution, the preset FIR filter coefficient meets following preset rules：So that letter
Number qfThe frequency spectrum of [n] reduces in data modulated subcarriers, and power increases in non-data modulated sub-carriers.
Based on the above technical solution, the FIR filter includes：M delayer, M multiplier and M-1 add
Musical instruments used in a Buddhist or Taoist mass, forms the FIR filter of M ranks, and M is the positive integer more than or equal to 1 and less than n；The output of each delayer is as next
Rank delayer and input with multiplier, the input of the output of the first multiplier as the first rank adder, remaining multiplies
The output of musical instruments used in a Buddhist or Taoist mass will feed back to single order adder as its input, and the output of each adder is also used as lower single order adder
Input.
Based on the above technical solution, the digital mobile forward pass link includes the centralization BBU as transmitting terminal
Pond and RRH as receiving terminal, pass through intensity modulated/Direct-detection Optical fibre link connection between the ponds centralization BBU and RRH；Institute
It includes the baseband processing module being sequentially connected, PCM modules and framing module to state the ponds centralization BBU；The RRH includes being sequentially connected
Solution frame module, PCM decoder modules, DAC, radio-frequency front-end and antenna.
Based on the above technical solution, the intensity modulated/Direct-detection Optical fibre link is OOK/PAM-4 optical fiber chains
Road.
The beneficial effects of the present invention are：
The present invention by quantizer part increase a backfeed loop and one it is designed have limit for length's unit impulse sound
Filter is answered, to form the PCM modules based on noise shaping.The PCM modules based on noise shaping change baseband OFDM
Signal passes through the frequency domain distribution of the quantizing noise generated when PCM modules, and quantization noise power is dropped in data modulated subcarriers
Low, and power increases in non-data modulated sub-carriers, certain in quantizing bit number in this way, i.e. quantizing noise general power is certain
In the case of, it can effectively reduce and solve adjusting data EVM caused by quantizing noise, to efficiently solve BBU in digital mobile forward pass
Signal transmission spectrum efficiency (quantizing bit number) is between transmission quality the problem of contradiction between RRH.
Description of the drawings
Fig. 1 is the structural schematic diagram for the digital mobile forward pass link that the present invention is used for；
Fig. 2 is the structural schematic diagram of the PCM modules based on noise shaping in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of FIR filter in the embodiment of the present invention；
Fig. 4 is quantization noise power distribution map；
Fig. 5 is that adjusting data EVM comparison diagrams are solved in simulation example.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment invention is further described in detail.
Or the present invention can lead to spectrum efficiency for quantizing noise is reduced because increasing quantizing bit number in the prior art
It reduces；Spectrum efficiency is promoted because reducing quantizing bit number, the contradictory problems that transmission quality can be caused impaired.Now provide
A kind of PCM modules based on noise shaping for digital mobile forward pass link can effectively reduce solution caused by quantizing noise
Adjusting data error vector magnitude realizes spectral efficient, high-quality transmission, efficiently solves dependent discrepancy in the prior art and ask
Topic.
The mentality of designing of the present invention is to provide a kind of PCM moulds based on noise shaping for digital mobile forward pass link
Block.Wherein, the digital mobile forward pass link can be found in shown in Fig. 1, include as the ponds centralization BBU of transmitting terminal and as connecing
The RRH of receiving end passes through intensity modulated/directly detection (IM/DD) optical fiber link connection between the ponds centralization BBU and RRH.For example,
As shown in Figure 1, can (On-Off Keying/Pulse Amplitude Modulation-4, binary system open by OOK/PAM-4
Close keying/4 grade pulse amplitude modulation) etc. the straight straightening inspection optical fiber link connection of low cost.Specifically, the ponds centralization BBU include according to
Secondary connected baseband processing module (BBU), PCM modules and framing module；RRH includes the solution frame module being sequentially connected, PCM decodings
Module, DAC (Digital to Analog Converter, digital analog converter), radio-frequency front-end and antenna.In the ponds centralization BBU
Baseband OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing) signal pass through base
After tape handling module (BBU) processing, baseband OFDM plural number continuous signal is generated, real part (roads I) and imaginary part (roads Q) are passed through respectively
PCM modules generate discrete digital signal；After carrying out framing using framing module, make signal by intensity modulated/directly detection
Optical fiber link is transferred to RRH.After solution frame module in RRH carries out frame decoding operation to signal, baseband discrete signal is obtained, using
PCM is decoded, and obtains baseband OFDM continuous signal, real part (roads I) and imaginary part (roads Q) pass through a DAC respectively becomes simulation letter
Enter radio-frequency front-end after number, then is sent to corresponding antenna and sends.
The present invention original digital mobile forward pass interface PCM inside modules, by quantizer part increase by one it is anti-
It is fed back to road and designed FIR (Finite impulse response, there is a limit for length's unit impulse response) filter, from
And form the PCM modules based on noise shaping.The PCM modules based on noise shaping can change base band OFDM signal process
The frequency domain distribution for the quantizing noise that PCM modules generate, quantization noise power is reduced in data modulated subcarriers, and in non-number
Increase according to power in modulated sub-carriers, it, can be in this way in the case where the certain i.e. quantizing noise general power of quantizing bit number is certain
Effectively reduce solution adjusting data EVM caused by quantizing noise.In other words, under identical EVM performance requirements, required quantization can be reduced
Bit number, to promote spectrum efficiency.
It is attached below in conjunction with specification to keep the technical problem to be solved in the present invention, technical solution and advantage clearer
Technical scheme of the present invention is described in detail in figure and specific embodiment.
The embodiment of the present invention provides a kind of PCM modules based on noise shaping for digital mobile forward pass link, the PCM
Module includes：Quantizer with backfeed loop and FIR filter, the quantizer form whole based on noise with FIR filter
The PCM modules of shape, base band OFDM signal can be changed when passing through (that is, by being based on noise by being somebody's turn to do the PCM modules based on noise shaping
When the quantizer of the PCM modules of shaping) caused by quantizing noise frequency domain distribution, by quantization noise power data modulate son
It is reduced on carrier wave, and power increases in non-data modulated sub-carriers.
Further, in a kind of optional embodiment, as shown in Fig. 2, the PCM modules based on noise shaping
Concrete structure includes：One quantizer, a FIR filter and two adders.First enter signal e [n] (n of quantizer
For the serial number of input signal), after quantizer is handled, obtain quantized signal eq[n]；One adder will quantify front and back letter
Number subtract each other, obtains signal q [n] (q [n]=eq[n]-e [n]), then signal q [n] is sent to FIR filter；Through FIR filter
Signal q is obtained after being filteredf[n]；Another adder is by signal qf[n] is added with base band OFDM signal s [n], is obtained
Subsequent time is input to the signal of quantizer.
Further, in a kind of optional embodiment, as shown in figure 3, the concrete structure packet of the FIR filter
It includes：M delayer (Z-1), M multiplier and (M-1) a adder, form the FIR filter of M ranks, M is more than or equal to 1 and small
In the positive integer of n；Wherein, the output of each delayer is as lower single order delayer and with the input of multiplier, the first rank
Input of the output of multiplier as the first rank adder, remaining multiplier (remaining multiplier i.e. in addition to the first multiplier)
Output will feed back to single order adder as its input, and the output of each adder is also as the defeated of lower single order adder
Enter.
FIR filter based on above structure, the signal q obtained after processingf[n] meets claimed below：
qf[n]=a1q[n-1]+a2q[n-2]+…+aMq[n-M]；
Wherein, M is the exponent number of filter, for the positive integer more than or equal to 1 and less than n, ai(i=1,2 ..., M) is design
Good filter coefficient, the coefficient meet certain design rule so that signal qfThe frequency spectrum of [n] drops in data modulated subcarriers
It is low, and power increases in non-data modulated sub-carriers, as shown in Figure 4.
The embodiment of the present invention quantizer part increase a backfeed loop and one it is designed have limit for length's unit punching
Response filter is swashed, to form the PCM modules based on noise shaping.The PCM modules based on noise shaping change base band
Ofdm signal passes through the frequency domain distribution of the quantizing noise generated when PCM modules, by quantization noise power in data modulated subcarriers
Upper reduction, and power increases in non-data modulated sub-carriers, certain in quantizing bit number in this way, i.e. quantizing noise general power one
In the case of fixed, it can effectively reduce and solve adjusting data EVM caused by quantizing noise, to efficiently solve in digital mobile forward pass
Signal transmission spectrum efficiency (quantizing bit number) is between transmission quality the problem of contradiction between BBU and RRH.
In order to further verify the attainable technique effect of institute of the invention, below in conjunction with attached drawing and simulation example, to foundation
The technique effect of PCM modules based on noise shaping proposed by the present invention for digital mobile forward pass link carries out specifically
It is bright.
It is the EVM performance comparisons of demodulated signal for 5,64QAM-OFDM signals with quantizing bit number in the simulation example
As shown in Figure 4.It can be seen that PCM (NS-PCM) scheme proposed by the present invention based on noise shaping, demodulated signal EVM is compared
Existing PCM schemes, have and are more obviously improved.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (7)
1. a kind of PCM modules based on noise shaping for digital mobile forward pass link, which is characterized in that the PCM module packets
It includes：Quantizer with backfeed loop and FIR filter, the quantizer form the PCM based on noise shaping with FIR filter
Module, base band OFDM signal generated quantizing noise when by quantizer can be changed by being somebody's turn to do the PCM modules based on noise shaping
Frequency domain distribution, quantization noise power is reduced in data modulated subcarriers, and in non-data modulated sub-carriers power increase
Add.
2. being used for the PCM modules based on noise shaping of digital mobile forward pass link as described in claim 1, feature exists
In the PCM modules based on noise shaping include：One quantizer, a FIR filter and two adders；
The signal e [n] for first entering quantizer obtains quantized signal e after quantizer is handledq[n], n are input signal
Serial number；One adder will quantify front and back signal subtraction, obtain signal q [n] (q [n]=eq[n]-e [n]), then by signal q
[n] is sent to FIR filter；Signal q is obtained after FIR filter is filteredf[n]；Another adder is by signal qf
[n] is added with base band OFDM signal s [n], obtains the signal that subsequent time is input to quantizer.
3. being used for the PCM modules based on noise shaping of digital mobile forward pass link as claimed in claim 2, feature exists
In the signal qf[n] meets claimed below：
qf[n]=a1q[n-1]+a2q[n-2]+…+aMq[n-M]；
Wherein, M is the exponent number of filter, for the positive integer more than or equal to 1 and less than n；ai(i=1,2 ..., M) is preset FIR
Filter coefficient.
4. being used for the PCM modules based on noise shaping of digital mobile forward pass link as claimed in claim 3, feature exists
In the preset FIR filter coefficient meets following preset rules：Make signal qfThe frequency spectrum of [n] is modulated son in data and is carried
It is reduced on wave, and power increases in non-data modulated sub-carriers.
5. being used for the PCM modules based on noise shaping of digital mobile forward pass link as described in claim 1, feature exists
In the FIR filter includes：M delayer, M multiplier and M-1 adder, form the FIR filter of M ranks, and M is
Positive integer more than or equal to 1 and less than n；
As lower single order delayer and with the input of multiplier, the output of the first multiplier is made for the output of each delayer
Output for the input of the first rank adder, remaining multiplier will feed back to single order adder as its input, and each add
Input of the output of musical instruments used in a Buddhist or Taoist mass also as lower single order adder.
6. the PCM moulds based on noise shaping for digital mobile forward pass link as described in any one of claim 1 to 5
Block, it is characterised in that：The digital mobile forward pass link includes as the ponds centralization BBU of transmitting terminal and as receiving terminal
RRH passes through intensity modulated/Direct-detection Optical fibre link connection between the ponds centralization BBU and RRH；
The ponds the centralization BBU include the baseband processing module being sequentially connected, PCM modules and framing module；The RRH include according to
Secondary connected solution frame module, PCM decoder modules, DAC, radio-frequency front-end and antenna.
7. being used for the PCM modules based on noise shaping of digital mobile forward pass link as claimed in claim 6, feature exists
In：The intensity modulated/Direct-detection Optical fibre link is OOK/PAM-4 optical fiber links.
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