CN102122996A - Analog radio frequency signal generation method and system - Google Patents

Analog radio frequency signal generation method and system Download PDF

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CN102122996A
CN102122996A CN2011100598064A CN201110059806A CN102122996A CN 102122996 A CN102122996 A CN 102122996A CN 2011100598064 A CN2011100598064 A CN 2011100598064A CN 201110059806 A CN201110059806 A CN 201110059806A CN 102122996 A CN102122996 A CN 102122996A
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digital signal
sampling
baseband signal
multipath
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CN102122996B (en
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刘龙
刘刚
邱海杰
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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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
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    • H04L25/03343—Arrangements at the transmitter end

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Abstract

The invention discloses an analog radio frequency signal generation method and system. The method comprises the following steps of: upsampling a baseband signal to acquire a first digital signal, wherein the sampling rate of upsampling is N times of original sampling rate of the baseband signal, and N is more than 1; downsampling according to the original sampling rate after the first digital signal is subject to time-delay and power attenuation so as to acquire a second digital signal; multiplying the second digital signal by related factors to acquire a third digital signal, wherein the related factors comprise a fading sequence of multipath fading caused by a multipath environment of a channel; and converting the multiplied third digital signal into an analog radio frequency signal to output. The analog radio frequency signal generation method and system, disclosed by the invention, realize the aim of modeling a process of transmitting a signal through the channel, and ensures that the complexity of modeling the process of transmitting the signal through the channel is greatly reduced on the premise that better performance is obtained.

Description

Analog radio-frequency signal generates method and system
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of signal of realizing and cross the analog radio-frequency signal of Channel Modeling and generate method and system.
Background technology
Wireless channel is the transmission medium of mobile communication, all information are all transmitted in channel, the quality of channel performance is directly determining the quality of communication, thus need usually to understand the characteristic of channel and it is accurately simulated, and then analog signal simulation in the transmission course in channel.Analog channel mainly is to determine the impulse response of the channel that will simulate, will send signal and channel impulse response and carry out convolution, realizes the simulation to signal transmission course in channel, and according to the signals transmission of simulation, realizes purposes such as signal test transmission.
Generating channel simulation real simulated territory channel in baseband digital domain, is the main flow implementation of present channel simulation.The simulation of transmission course in channel has two kinds of implementations to signal:
1) the direct channel impulse response that generates numeric field according to the former sample rate of baseband signal, with the digital signal of base band generation and the channel impulse response convolution of generation, with the digital signal transition that obtains after the convolution is analog signal, and analog radio-frequency signal is transmission course in channel.
Baseband signal is exactly the direct signal of wanting information transmitted of having expressed that information source (information source also claim to be sent out a terminal) is sent, for information source send less than raw electrical signal through ovennodulation (carrying out frequency spectrum shift and conversion).The baseband signal of communication system all generates at numeric field, and all there is the former sample rate that standard can the regulation baseband signal in each system, and the former sample rate of baseband signal is lower, and modulation obtains analog radio-frequency signal and launches to baseband signal.
With multiple-input and multiple-output MIMO is example, adopts this mode signals transmission to be expressed as follows:
x ( kT S ) * h ( nT S , kT S ) = x ( kT S ) * Σ l = 1 L p l Cg l ( nT S ) δ ( kT S - M l T S )
= Σ l = 1 L p l Cg l ( nT S ) x ( kT S - M l T S ) Formula (1)
Wherein, x (kT S) be the digital signal that baseband signal is obtained by former sample rate sampling, h (nT S, kT S) be the channel impulse response that generates numeric field according to the former sample rate of baseband signal, T SBe the sampling interval by former sample rate sampling, k, n are positive integer, and L is the multipath number, p lBe the power attenuation in l bar footpath, 1≤l≤L, C is the relevant moulding matrix of reflection multichannel baseband signal transmission correlation, g l(nT S) be the sequence that declines soon in l bar footpath, M lIt is the time delay sampling number that l bar footpath forms according to former sample rate quantification.
As seen, the signal of Channel Transmission is an analog radio-frequency signal in the reality, and adopt at the former sample rate generation channel impulse response of numeric field according to baseband signal, analog radio-frequency signal is transmission course in channel, because sampling number is few, therefore the scheme complexity is lower, but simultaneously because sampling number is few, the degree true to nature of the radiofrequency signal that the signal of numeric field is simulated relatively and the relative actual channel of channel of numeric field is poorer, and therefore, the channel impulse response temporal resolution that generates according to former sample rate is also lower, because the multipath characteristics of signal transmission, may cause the aliasing of multipath, thereby influence the modeling performance, can't carry out the signal test transmission.
2) rise the channel impulse response that sample rate after the sampling generates numeric field according to former relatively sample rate, to rise sample channel impulse response convolution to what baseband signal rose digital signal after the sampling and generation, obtain high sampling rate signal through channel distortions, the high sampling rate signal is exported digital signal through down-sampling filtering with former sample rate, D/A converting circuit is an analog signal with the digital signal transition of output, realizes analog radio-frequency signal transmission course in channel.
Rise sampling and be meant that promoting the sample rate of setting multiple according to former relatively sample rate samples.
With multiple-input and multiple-output MIMO is example, adopts this mode analog signal transmission procedural representation as follows:
Figure BDA0000049877220000022
Figure BDA0000049877220000023
Formula (2)
Figure BDA0000049877220000024
Formula (3)
In this mode, x (kT S_UP) be by rising the digital signal that the sample rate sampling obtains, h (nT to baseband signal S_UP, kT S_UP) be according to rising the channel impulse response that sample rate generates numeric field, T S_UPFor rising the sampling interval after the sampling, k, n are positive integer, and L is the multipath number, p lBe the power attenuation in l bar footpath, 1≤l≤L, C is the relevant moulding matrix of reflection multichannel baseband signal transmission correlation, g l(nT S_UP) be the sequence that declines soon in l bar footpath, Q is for rising sampling multiple, m lBe that l bar footpath is according to rising the time delay sampling number that sampling sample rate quantification afterwards forms.
Because m l/ Q one is decided to be integer, so direct production (3) needs first production (2), down-sampledly again comes approximate obtain (3).Because m l/ Q one is decided to be integer, so formula (1) and formula (3) inequivalence rise the sampling back and diminish at interval, process is more near actual value.
This scheme is because the sampling number of baseband signal and channel is more, therefore more approach actual analog signal and channel, can effectively improve the temporal resolution of channel impulse response, but simultaneously because sampling number is many, (N is for rising the multiple of sampling adopting the former sampling of N*, when sample rate N＞1) is carried out liter sampling, complexity be last scheme N doubly, therefore give and realize that signal transmission course simulation in channel brings big difficulty.
Simultaneously for the scene of multiple-input and multiple-output MIMO, existing scheme is identical usually to the liter sampling multiple of multiple signals, in the bandwidth of multiple signals not simultaneously, causes the sample rate difference of multiple signals like this.For the channel that has time delay, the sample rate difference of multiple signals can cause the time delay sample value difference of quantification, and frequency domain correlation also can be different, also can influence radiofrequency signal transmission course simulation in channel.
As seen, the shortcoming of prior art mainly is or the complexity low accuracy is also lower, or the high complexity of accuracy is also higher, can't reach the better compromise of complexity and performance.
Summary of the invention
The invention provides a kind of analog radio-frequency signal and generate method and system, cross being modeled in of channel in order to original relatively signal and obtain better compromise on complexity and the performance.
The invention provides a kind of analog radio-frequency signal generation method, comprising:
Baseband signal is carried out rising sampling, obtains first digital signal, the sample rate of described liter sampling be baseband signal former sample rate N doubly, N＞1;
To described first digital signal delay time and power attenuation after, by described former sample rate down-sampled, obtain second digital signal;
Described second digital signal and correlation factor are multiplied each other, obtain three digital signal, described correlation factor comprises the decline sequence that the reflection channel radially declines;
The three digital signal that will obtain after will multiplying each other is converted to analog radio-frequency signal output.
The present invention also provides a kind of analog radio-frequency signal generation system, comprising:
Rise sampling apparatus, be used for baseband signal is carried out rising sampling, obtain first digital signal, the sample rate of described liter sampling be baseband signal former sample rate N doubly, N＞1;
Power attenuation and time-delay mechanism are used for described first digital signal is delayed time and power attenuation;
Down-sampled device, be used for to the time-delay and power attenuation after signal down-sampled by described former sample rate, obtain second digital signal;
The decline sequence generator is used to generate the decline sequence that the reflection channel radially declines;
Multiplier multiplies each other described second digital signal and correlation factor, obtains three digital signal, and described correlation factor comprises the decline sequence;
Transducer, the three digital signal that is used for obtaining after multiplying each other are converted to analog radio-frequency signal output.
Utilize analog radio-frequency signal provided by the invention to generate method and system, have following beneficial effect: prior art is obtaining under the prerequisite of better performance relatively, makes the complexity that signal transmitted the modeling of channel reduce greatly, to realizing bringing very big facility.
Description of drawings
Fig. 1 is a signals transmission analogy method flow chart provided by the invention;
Fig. 2 is a signals transmission analogue system structure chart provided by the invention;
The signals transmission analogue system structure chart that Fig. 3 provides for the embodiment of the invention;
Fig. 4 is the structure chart of multiphase filter in the embodiment of the invention;
Fig. 5 is a multistage multiphase filter level link composition in the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples analog radio-frequency signal provided by the invention being generated method and system illustrates in greater detail.
For the modeling of signal transmission course in channel, for obtaining on complexity and performance better, original relatively modeling pattern trades off, the invention provides a kind of analog radio-frequency signal generation method, as shown in Figure 1, comprising:
Step S101 carries out rising sampling to baseband signal, obtains first digital signal, the sample rate of described liter sampling be baseband signal former sample rate N doubly, N＞1;
The baseband signal of communication system all generates at numeric field, and all there is the former sample rate that standard can the regulation baseband signal in each system, and the former sample rate of baseband signal is lower.
Rise sampling multiple N and be generally integer and, realize rising the purpose of sampling, rise the first digital signal x (kT that sampling obtains greater than 1 S_UP) sampling time interval T S_UPShorter, kT wherein S_UPThe expression sampled point, k is a positive integer.
Step S102, to described first digital signal delay time and power attenuation after, by described former sample rate down-sampled, obtain second digital signal;
To the first digital signal x (kT S_UP) delay value of delaying time and the power attenuation value of carrying out power attenuation, specifically determine, to have corresponding time delay value and power attenuation value in different scenes according to existing standard according to the different communication systems scene, no longer describe in detail here.
By down-sampled, the sampling interval that obtains second digital signal is the sampling interval of former sample rate correspondence in this step.
Step S103, described second digital signal and correlation factor are multiplied each other, obtain three digital signal, described correlation factor comprises the decline sequence that the reflection channel radially declines, in this step, second digital signal and correlation factor multiplied result rise behind the channel impulse response of sampling by down-sampled the coming to the same thing of obtaining of former sample rate with the first digital signal convolution;
Because the sample rate of second digital signal is former sample rate, therefore complexity reduces greatly, since before carried out carrying out after rising sampling after time delay and the power attenuation down-sampled and multiply each other to signal with the correlation factor of the reflection characteristic of channel, therefore, its result who obtains and the first digital signal convolution rise behind the channel impulse response of sampling identical by the down-sampled effect that realizes of former sample rate.
Step S104, the three digital signal that will obtain after will multiplying each other are converted to analog radio-frequency signal and output, thereby finish the modeling that signal is crossed channel.
The generation method of analog radio-frequency signal provided by the invention, prior art is obtaining under the prerequisite of better performance relatively, makes the complexity of modeling reduce greatly.
The decline sequence that above-mentioned reflection channel radially declines is according to the difference of channel model and difference, and alternatively, for the channel model that declines soon, this decline sequence can also be applied to decline slowly channel certainly for declining soon, and the value of decline sequence can be different.
Has multipath characteristics in the signals transmission, therefore, need carry out modeling at the channel multi-path transmission characteristic, preferably, present embodiment to described first digital signal delay time and power attenuation after, down-sampled by described former sample rate, obtain second digital signal, specifically comprise: determine the multipath number according to the multipath characteristics of transmission environment; To first digital signal delay time by the time delay value in every footpath and power attenuation value and power attenuation after, down-sampled by described former sample rate, obtain second digital signal of multipath.
With the channel impulse response of baseband signal convolution be to comprise the time delay value in every footpath and the multipath channel impulse response of power attenuation value.Be that channel impulse response is for having reflected signal transmission multipath characteristics, and the time delay value in the footpath number that channel impulse response comprises, every footpath and power attenuation value, the time delay value and the power attenuation value in employed footpath number, every footpath are identical during with the first digital signal time delay and power attenuation.According to existing standard, have corresponding footpath number in different scenes, and every time delay value and power attenuation value that the footpath is corresponding.In baseband signal is the multichannel baseband signal, and described correlation factor specifically comprises the relevant moulding Matrix C of reflection multichannel baseband signal transmission correlation and the product of decline sequence.
With multiple-input and multiple-output MIMO application scenarios is example, and the principle that analog radio-frequency signal generation method provided by the invention can obtain above-mentioned performance is utilized formula to derive and is described as follows.
Actual channel impulse response h (t τ) can be described as:
Figure BDA0000049877220000061
p lBe the power attenuation in l bar footpath, 1≤l≤L, L are the multipath number, and C is the relevant moulding matrix of reflection multichannel baseband signal transmission correlation, g l(t) be the signal that declines soon in l bar footpath, τ lIt is the time delay in l bar footpath.
The process of signal x (τ) mistake channel can be described as in the reality:
x ( τ ) * h ( t , τ ) = x ( τ ) * Σ l = 1 L p l Cg l ( t ) δ ( τ - τ l ) = Σ l = 1 L p l Cg l ( t ) x ( τ - τ l )
Signal is crossed Channel Modeling and is carried out at numeric field in the embodiment of the invention, therefore as previously mentioned, in order to reduce the complexity of realization, should carry out convolution with the channel impulse response that generates by former sample rate by the digital signal of former sample rate sampling, is expressed as follows:
x ( kT S ) * h ( nT S , kT S ) = x ( kT S ) * Σ l = 1 L p l Cg l ( nT S ) δ ( kT S - M l T S )
= Σ l = 1 L p l Cg l ( nT S ) x ( kT S - M l T S ) Formula (1)
In order to obtain reasonable signals transmission simulated performance, use the second way of the prior art, promptly need the channel impulse response behind channel module and up-sampling of the digital signal behind the up-sampling is carried out the high sampling rate signal that convolution obtains the process channel distortions, operation result is exported with former sample rate through down-sampling filtering again, with multiple-input and multiple-output MIMO is example, and expression is suc as formula shown in (2) and the formula (3):
Figure BDA0000049877220000074
Figure BDA0000049877220000075
Formula (2)
Figure BDA0000049877220000076
Formula (3)
The physical model meaning is the physics of actual transmissions environment abstract, the clarke model is the channel Mathematical Modeling of the multipath fading used always, and the Jakes model generator is a simulation model that generates the clarke model, the clarke model specific implementation form just, the signal that declines soon that its produces be broad sense stably, and the statistical property in the Clarke model that can coincide preferably.Preferably, the sequence that declines soon in every footpath can be produced by the JAKES modeling in the present embodiment.
Find after deliberation according to above-mentioned formula, rising before and after the sampling sequence that declines soon that JAKES model generator in fact generates is identical, it is the difference of counting that produces, but corresponding relation is arranged between counting, be about to rise the sequence that declines soon that the JAKES model generator after the sampling generates carry out down-sampled, with the original sequence that declines soon that the JAKES model generator generates when rising sampling be identical.And rising time delay on every footpath after main variation that sampling brings is to rise sampling more near ideal value, i.e. sample rate influence is the resolution of time delay.
Like this, according to embodiment of the present invention, baseband signal is carried out rising sampling, obtain first digital signal, to described first digital signal delay time and power attenuation after, down-sampled by described former sample rate, obtain second digital signal under multiple-input and multiple-output scene, consideration multipath characteristics situation, should be in the formula (3)
Figure BDA0000049877220000081
Preferably, described baseband signal is the multichannel baseband signal, described second digital signal and correlation factor are multiplied each other, specifically comprise: after second digital signal in every footpath being multiply by continuously the sequence that declines soon in C and this footpath, carry out the multipath stack, obtain three digital signal, promptly obtain the result of above-mentioned formula (3), the present invention realizes the raising of resolution under the situation that complexity reduces greatly like this.
Above-mentioned example of just giving a kind of channel model, existing different channels model with the different scene correspondences of generation, in the different channel models, the concrete numerical value of each parameter may be different in the above-mentioned formula, the process of determining each parameter in the above-mentioned formula is a prior art, no longer describes in detail here.
In the MIMO scene, in order to have solved the different problem of the inconsistent selectivity of channel frequency that causes of different bandwidth down-sampling rate, preferably, in the present embodiment baseband signal is carried out rising sampling, specifically comprise:, determine the liter sampling multiple of every roadbed band signal according to the bandwidth of every roadbed band signal; By the liter sampling multiple of determining every roadbed band signal is carried out rising sampling, the sample rate unanimity when making the multichannel baseband signal rise sampling, bandwidth is big more like this, and it is more little to rise the sampling multiple, and bandwidth is more little, and it is big more to rise the sampling multiple.
The method for transmitting signals that the above embodiment of the present invention provides has proposed the scheme that a kind of new signal is crossed Channel Modeling, and this scheme is come modeling MIMO channel based on the correlation matrix method.The present invention only needs signal is carried out rising sampling, to rise signal after the sampling then carries out down-sampled again and the decline of not carrying out rising sampling after time delay and the power attenuation and multiplies each other and obtain signal through after the channel distortions, through the derivation of equation second kind of scheme of equivalence on this scheme performance as can be known, but complexity reduces greatly.Consider various bandwidth down-sampling rate consistency and sampling multiple complexity and Effect on Performance simultaneously, need reasonably to determine to rise the multiple of sampling system.For example rising 8 times or 16 times of samplings after deliberation for Channel Modeling is better trading off to its performance and complexity, so the confirmable sampling plan that rises is: rise 8 times of samplings under the 20M bandwidth, rise 16 times of samplings under the 10M bandwidth, rise 32 times of samplings under the 5M bandwidth, also can obtain similar application for other system bandwidth.
The embodiment of the invention also provides a kind of analog radio-frequency signal generation system, as shown in Figure 2, comprising:
Rise sampling apparatus, be used for baseband signal is carried out rising sampling, obtain first digital signal, the sample rate that rises sampling be baseband signal former sample rate N doubly, N＞1, preferably, rise sampling apparatus and specifically adopt interpolation filter, according to the multiple that rises sampling, the exponent number of design interpolation filter, when liter sampling multiple was big, required interpolation filter exponent number was higher;
Power attenuation and time-delay mechanism, be used for described first digital signal is delayed time and power attenuation, the concrete time delay value that uses is determined according to different scenes with the power attenuation value, when considering the multistage characteristic of signal transmission, preferably, power attenuation and time-delay mechanism specifically are used for according to the multipath number, and first digital signal is delayed time and power attenuation by the time delay value and the power attenuation value in every footpath;
Down-sampled device, be used for the signal after time-delay and the power attenuation down-sampled by described former sample rate, obtain second digital signal, preferably, rise sampling apparatus and specifically adopt decimation filter,, be used for the signal after time-delay and the power attenuation on every footpath for the situation of multipath, it is down-sampled to press described former sample rate, obtains second digital signal of multipath;
The decline sequence generator is used to generate the decline sequence that the reflection channel radially declines, according to the difference of channel model, and the decline sequence difference that is generated;
Multiplier, second digital signal and correlation factor are multiplied each other, obtain three digital signal, described correlation factor comprises the decline sequence, second digital signal and correlation factor multiplied result and the first digital signal convolution rise behind the channel impulse response of sampling by down-sampled the coming to the same thing of obtaining of former sample rate, under multiple-input and multiple-output MIMO scene, definite mode of correlation factor is shown in above-mentioned embodiment, and application scenarios is not limited to the MIMO scene, under the scene of single input and output, can determine correlation factor equally by above-mentioned derivation of equation mode;
Transducer, the three digital signal that is used for obtaining after multiplying each other are converted to analog radio-frequency signal output, finish the modeling that signal is crossed channel, like this by the signals transmission simulation, can purpose such as measure to the various performances of signal transmission.
Because the multipath characteristics of signal transmission, alternatively, power attenuation and time-delay mechanism specifically are used for the multipath number according to transmission, and first digital signal is delayed time and power attenuation by the time delay value and the power attenuation value in every footpath; Described down-sampled device specifically is used for the signal after time-delay and the power attenuation on every footpath, and is down-sampled by described former sample rate, obtains second digital signal of multipath.Described decline sequence generator specifically is used to generate the multipath fading sequence that the reflection multipath channel radially declines.Described multiplier specifically is used for second digital signal in every footpath be multiply by continuously the decline sequence in C and this footpath; This system also comprises: the multipath superimposer, be used for the signal of multiplier output is carried out the multipath stack, and obtain three digital signal.
As shown in Figure 3, rise sampling apparatus and specifically adopt interpolation filter, the concrete decimation filter of down-sampled device, for the MIMO scene, this system also comprises: the correlation matrix former, be used to generate the relevant moulding Matrix C of reflection multichannel baseband signal transmission correlation, utilize the correlation matrix former to generate relevant moulding Matrix C and be prior art, no longer describe in detail here; Described decline sequence is specially the sequence that declines soon, described decline sequence generator is specially the multipath channel that declines is soon carried out the sequence generator that declines soon of model emulation, be used to generate the sequence that declines soon in every footpath, preferably, this sequence generator that declines soon is specially the Jakes model generator that multidiameter fading channel is carried out model emulation; Under the multipath situation, multiplier specifically is used for second digital signal in every footpath be multiply by continuously the sequence that declines soon in C and this footpath; The multipath superimposer is used for the signal of multiplier output is carried out the multipath stack, obtains three digital signal, i.e. the result of formula (3).
Because traditional interpolation filter has a lot of zero points, if adopt general interpolation filter can have a lot of nonsensical computings.In order to reduce operand, present embodiment interpolation filter when realizing adopts the multiphase filter of being made up of a plurality of subfilters, when liter sampling multiple is N, adopt N factor interpolation doubly, amount of calculation can be reduced to original 1/N by the multiphase filter that N sub-filter formed.In order to adopt minimum memory construction, can adopt a plurality of transducers, for example can adopt structure as shown in Figure 4, wherein x by four times of interpolation Old(n) digital signal for importing, h (0)～h (11) is the coefficient of four subfilters, the coefficient of the corresponding subfilter of each row among h (0)～h (11), multiplier rotating switch after finishing the multiplication of an input signal and a subfilter points to next subfilter, and adder is exported addition with multiplier and obtained output signal x New(n ').
In addition, be different because different system bandwidths rises the sampling multiple, for example consider three kinds of situations of 20M, 10M and 5M system.When rising decimation factor when big, required filter order is higher, can adopt the mode of multistage interpolation filter filtering to reduce operand, and alternatively, interpolation filter adopts multiphase filter.Structure adopts the sampling apparatus that rises of multistage interpolation filter specifically to be used for every roadbed band signal being carried out rising sampling, the sample rate unanimity when making the multichannel baseband signal rise sampling by the liter sampling multiple of determining according to the bandwidth of every roadbed band signal.The interpolation filter of described multi-stage cascade is applicable to that the baseband signal of single bandwidth and many bandwidth communication systems rises sampling.
As shown in Figure 5, when the bandwidth of multichannel baseband signal is respectively 20MHz, 10MHz and 5MHz, rise the interpolation filter that sampling apparatus adopts three-stage cascade, first order interpolation filter is realized 8 times and is risen sampling, second level interpolation filter is realized 2 times and rises sampling that third level interpolation filter is realized 2 times and risen sampling.Filter order and coefficient be flexible configuration as required.This scheme is applicable to the system of any single bandwidth or many bandwidth, for single bandwidth, realize rising step by step sampling, for many bandwidth, by designing the liter sampling multiple of realizations at different levels, realize output sampling rate never at the same level digital signal always, only need the coefficient of increase and decrease filter order and optimization filter to get final product, just use 20M, 10M here, the 5M system bandwidth illustrates, and also is for the effective multiplexing problem of many bandwidth system median filter is described simultaneously.Therefore at the many bandwidth applications of interpolation filter, can adopt a plurality of filter cascade modes, filter order and coefficient can flexible configuration be realized the multiplexing of filter.At interpolation filter list bandwidth applications, high-order filtering situation can adopt a plurality of filter cascade modes, and filter order and coefficient can flexible configuration.
The durability of filter under the different system bandwidth has been considered in the application of multiple filter, and has effectively reduced the required filter order of high multiple liter sampling.Multiphase filter has effectively reduced the amount of calculation of convolution, and two kinds comprehensive use has further reduced the complexity that realizes.
The present invention has only verified and need carry out liter sampling and not need that decline is carried out rising sampling satisfying the requirement that improves channel impulse response time domain resolution to signal by the derivation of equation, adopt mode multistage and that multiphase filter combines further to reduce complexity, also solved the different problem of the inconsistent selectivity of channel frequency that causes of different system bandwidth down-sampling rate simultaneously.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative notion of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (18)

1. an analog radio-frequency signal generation method is characterized in that, comprising:
Baseband signal is carried out rising sampling, obtains first digital signal, the sample rate of described liter sampling be baseband signal former sample rate N doubly, N＞1;
To described first digital signal delay time and power attenuation after, by described former sample rate down-sampled, obtain second digital signal;
Described second digital signal and correlation factor are multiplied each other, obtain three digital signal, described correlation factor comprises the decline sequence that the reflection channel radially declines;
The three digital signal that will obtain after will multiplying each other is converted to analog radio-frequency signal output.
2. the method for claim 1 is characterized in that, to described first digital signal delay time and power attenuation after, by described former sample rate down-sampled, obtain second digital signal, specifically comprise:
Determine the multipath number according to the transmission environment multipath characteristics;
To first digital signal delay time by the time delay value in every footpath and power attenuation value and power attenuation after, down-sampled by described former sample rate, obtain second digital signal of multipath.
3. method as claimed in claim 1 or 2 is characterized in that, described baseband signal is the multichannel baseband signal, and described correlation factor specifically comprises the relevant moulding Matrix C of reflection multichannel baseband signal transmission correlation and the product of decline sequence.
4. method as claimed in claim 3 is characterized in that, described decline sequence is specially the multipath fading sequence that the reflection multipath channel radially declines, and described second digital signal and correlation factor are multiplied each other, and specifically comprises:
After second digital signal in every footpath being multiply by continuously the decline sequence in C and this footpath, carry out the multipath stack, obtain three digital signal.
5. method as claimed in claim 1 or 2 is characterized in that, described decline sequence is specially the sequence that declines soon, and the described sequence that declines is soon generated by the fast failure model maker that channel that multipath is declined soon carries out model emulation.
6. method as claimed in claim 1 or 2 is characterized in that, baseband signal is carried out rising sampling, specifically comprises:
By adopting the multiphase filter of forming by a plurality of subfilters, realize baseband signal is carried out rising sampling.
7. method as claimed in claim 1 or 2 is characterized in that, described baseband signal is the multichannel baseband signal, and baseband signal is carried out rising sampling, specifically comprises:
According to the bandwidth of every roadbed band signal, determine the liter sampling multiple of every roadbed band signal;
Every roadbed band signal is carried out rising sampling, the sample rate unanimity when making the multichannel baseband signal rise sampling by the liter sampling multiple of determining.
8. method as claimed in claim 1 or 2 is characterized in that, by the interpolation filter of multi-stage cascade, realizes baseband signal is carried out rising sampling.
9. method as claimed in claim 8 is characterized in that, the baseband signal that realizes by the interpolation filter of multi-stage cascade rises sampling, is applicable to single bandwidth and many bandwidth communication systems.
10. an analog radio-frequency signal generation system is characterized in that, comprising:
Rise sampling apparatus, be used for baseband signal is carried out rising sampling, obtain first digital signal, the sample rate of described liter sampling be baseband signal former sample rate N doubly, N＞1;
Power attenuation and time-delay mechanism are used for described first digital signal is delayed time and power attenuation;
Down-sampled device, be used for to the time-delay and power attenuation after signal down-sampled by described former sample rate, obtain second digital signal;
The decline sequence generator is used to generate the decline sequence that the reflection channel radially declines;
Multiplier multiplies each other described second digital signal and correlation factor, obtains three digital signal, and described correlation factor comprises the decline sequence;
Transducer, the three digital signal that is used for obtaining after multiplying each other are converted to analog radio-frequency signal output.
11. system as claimed in claim 10 is characterized in that, described power attenuation and time-delay mechanism specifically are used for the multipath number according to transmission, and first digital signal is delayed time and power attenuation by the time delay value and the power attenuation value in every footpath;
Described down-sampled device specifically is used for the signal after time-delay and the power attenuation on every footpath, and is down-sampled by described former sample rate, obtains second digital signal of multipath.
12., it is characterized in that described baseband signal is the multichannel baseband signal as claim 10 or 11 described systems, this system also comprises:
The correlation matrix former is used to generate the relevant moulding Matrix C that reflection multichannel baseband signal is transmitted correlation;
Described multiplier specifically is used for second digital signal be multiply by C and decline sequence continuously.
13. system as claimed in claim 12 is characterized in that, described decline sequence generator specifically is used to generate the multipath fading sequence that the reflection multipath channel radially declines,
Described multiplier specifically is used for second digital signal in every footpath be multiply by continuously the decline sequence in C and this footpath; This system also comprises:
The multipath superimposer is used for the signal of multiplier output is carried out the multipath stack, obtains three digital signal.
14., it is characterized in that described decline sequence is specially the sequence that declines soon as claim 10 or 11 described systems, described decline sequence generator is specially the multipath channel that declines is soon carried out the fast failure model maker of model emulation.
15. as claim 10 or 11 described systems, it is characterized in that, the described multiphase filter of sampling apparatus that rise for forming by a plurality of subfilters, described down-sampled device is a decimation filter.
16. as claim 10 or 11 described systems, it is characterized in that, the described sampling apparatus that rises specifically is used for every roadbed band signal being carried out rising sampling, the sample rate unanimity when making the multichannel baseband signal rise sampling by the liter sampling multiple of determining according to the bandwidth of every roadbed band signal.
17. as claim 10 or 11 described systems, it is characterized in that, describedly rise the interpolation filter that sampling apparatus is a multi-stage cascade.
18. system as claimed in claim 17 is characterized in that, the interpolation filter of described multi-stage cascade is applicable to that the baseband signal of single bandwidth and many bandwidth communication systems rises sampling.
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