CN101420397B - Digital repeater station and self-excited eliminating method and device - Google Patents
Digital repeater station and self-excited eliminating method and device Download PDFInfo
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Abstract
The present invention is suitable for communication field, and provides a digital repeater, a self-excitation counteracting method and a device thereof, wherein the device comprises the following components: a digital baseband signal collecting unit which is used for collecting and combining a first digital baseband signal and a second digital baseband signal to obtain an exercise reference digital baseband signal; an estimator which executes the nonlinear model estimation of transceiver coupling channel according to the exercise reference digital baseband signal to obtain each parameter of a nonlinear filter; the nonlinear filter which is used for executing self-adapting real-time operation to the input first digital baseband signal according to each obtained nonlinear filter parameter to obtain a baseband counteracting signal which reflects the nonlinear channel characteristic of the transceiver feedback channel; and a self-excitation counteracting unit which is used for executing signal counteracting according to the first baseband signal and the baseband counteracting signal. The method and device according to the invention estimate the nonlinear characteristic in the transceiver feedback channel thereby effectively reducing the effect of interfering signal and obtaining a better self-excitation counteracting effect.
Description
Technical field
The invention belongs to the communications field, relate in particular to a kind of digital high-frequency amplification station and self-excitation thereof and offset method and apparatus.
Background technology
Adopt duplexer to carry out the switching of uplink downlink with the frequency wireless discharging-directly station more, utilize forward facing antenna to receive the base station down signal, through low noise amplifier useful signal is amplified, again behind the narrow band filter multiple filter, further with power amplifier with power amplification, be transmitted into travelling carriage by rearward-facing antenna; Utilize rearward-facing antenna receiving mobile upward signal simultaneously, be transmitted into the base station through low noise amplifier, narrow band filter, power amplifier.It is a little: with the cost of investment increase coverage territory far below the base station, mounting condition is simple, can enlarge network coverage face fast; Improve the utilization rate of equipment and installations of base station, improve the covering quality of existing Cellular Networks.
But in actual applications, with wireless discharging-directly station is nearer owing to forward and backward antenna infield frequently, inevitably between the forward and backward antenna, be coupled, if system gain is too big, during greater than the isolation between the forward and backward antenna of repeater, self-excitation phenomena will take place in the repeater, not only influence the operate as normal of repeater equipment itself, also will have a strong impact on relevant base station, cause whole communication system normally to move, gently then make distorted signals, heavy then cause the paralysis of whole communication network.
Prior art provides a kind of digital high-frequency amplification station (Interface Cancellation System Repeater, the ICS repeater), it utilizes digital processing technology, detects interference signal and counteracting from the wireless receiving signal, thereby has avoided the generation of straight-forward station self-excitation phenomenon.But because the wireless coupling channel between the forward and backward antenna of repeater generally is linear, therefore, existing ICS generally adopts the repeater linear filter as digital filter, comes the interference signal in the filtering wireless receiving signal.The non-linear factors such as power amplification distortion that adopt linear filter can't offset as digital-filter IC S repeater to produce between the forward and backward antenna with wireless discharging-directly station frequently are to the influence of wireless receiving signal.
Summary of the invention
The object of the present invention is to provide a kind of self-excitation to offset method, be intended to solve existing digital high-frequency amplification station and be difficult to offset the non-linear factors such as power amplification distortion that produce between the transceiver with wireless discharging-directly station frequently problem the influence of wireless receiving signal.
The present invention is achieved in that a kind of self-excitation offsets method, and described method comprises the steps:
Collection also merges first digital baseband signal and second digital baseband signal, obtain exercise reference digital baseband signal, described first digital baseband signal is the digital baseband signal before self-excitation offsets, and described second digital baseband signal is the digital baseband signal after offseting;
Carry out the nonlinear model of transceiver coupling channel according to described exercise reference digital baseband signal and estimate, obtain each parameter of nonlinear filter;
According to each parameter of described nonlinear filter, first digital baseband signal of input is carried out the self adaptation real-time operation, obtain reflecting the base band offseting signal of the nonlinear channel characteristic of transceiver feedback channel, it is specially:
Wherein x (t) is first digital baseband signal, and y (t) is the base band offseting signal, and t is the time, and N is a linear filter length, and P is the nonlinear factor size, and A (n), B (p) are the parameter of described nonlinear filter;
Carry out the signal cancellation processing according to described first baseband signal and base band offseting signal, obtain second digital baseband signal.
Another object of the present invention is to provide a kind of self-excitation to offset device, described device comprises:
Digital baseband signal collecting unit, be used for gathering and merging first digital baseband signal and second digital baseband signal, obtain exercise reference digital baseband signal, described first digital baseband signal is the digital baseband signal before self-excitation offsets, and described second digital baseband signal is the digital baseband signal after offseting;
Estimator, the exercise reference digital baseband signal that is used for obtaining according to described digital baseband signal collecting unit carry out the nonlinear model of transceiver coupling channel to be estimated, obtains each parameter of nonlinear filter;
Nonlinear filter, each parameter that is used for the nonlinear filter that obtains according to described estimator, first digital baseband signal to input carries out the self adaptation real-time operation, obtains reflecting the base band offseting signal of the nonlinear channel characteristic of transceiver feedback channel, and it is specially:
Wherein x (t) is first digital baseband signal, and y (t) is the base band offseting signal, and t is the time, and N is a linear filter length, and P is the nonlinear factor size, and A (n), B (p) are the parameter of described nonlinear filter;
The self-excitation offset unit is used for carrying out the signal cancellation processing according to described first baseband signal and base band offseting signal, obtains second digital baseband signal.
Another object of the present invention is to provide a kind of digital high-frequency amplification station, comprise the radiofrequency signal receiving element, the Digital Down Convert unit, Digital Up Convert unit and emission of radio frequency signals unit, described digital high-frequency amplification station comprises that also described self-excitation offsets device, and described self-excitation offsets device and is connected with described Digital Down Convert unit, Digital Up Convert unit respectively.
In embodiments of the present invention, by adopting each parameter of the nonlinear filter that nonlinear filter obtains according to estimator, first digital baseband signal to input carries out the self adaptation real-time operation, obtain reflecting the base band offseting signal of the nonlinear channel characteristic of transceiver feedback channel, by the self-excitation offset unit, handle to carry out signal cancellation again according in first baseband signal, deducting the base band offseting signal.The present invention can approach the characteristic of the nonlinear device in the transceiver feedback channel accurately, has effectively reduced the influence of interference signal, reaches better self-excitation and offsets effect.
Description of drawings
Fig. 1 is the structured flowchart of the digital high-frequency amplification station that provides of the embodiment of the invention;
Fig. 2 is the structured flowchart that self-excitation that the embodiment of the invention provides offsets device;
Fig. 3 is the realization flow figure that self-excitation that the embodiment of the invention provides offsets method.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In embodiments of the present invention, gather first digital baseband signal and second digital baseband signal, this first digital baseband signal is the digital baseband signal before self-excitation offsets, second digital baseband signal is the digital baseband signal after self-excitation offsets, estimate according to the nonlinear model that first digital baseband signal of gathering and second digital baseband signal carry out transceiver coupling channel, obtain estimated parameter, according to the estimated parameter that obtains, first digital baseband signal to input carries out the self adaptation real-time operation, obtain reflecting the base band offseting signal of the nonlinear channel characteristic of transceiver feedback channel, carry out signal cancellation according to first baseband signal and base band offseting signal, thereby avoided the generation of digital high-frequency amplification station self-excitation phenomena.
Fig. 1 shows the structure of the digital high-frequency amplification station that the embodiment of the invention provides, and for the ease of saying, only shows the part relevant with the embodiment of the invention.
Existing digital high-frequency amplification station includes several softwares or hardware cell modules such as radiofrequency signal receiving element 11, Digital Down Convert unit 12, Digital Up Convert unit 14 and emission of radio frequency signals unit 15.From aerial received RF signal, and the radiofrequency signal that receives carried out demodulation process by radiofrequency signal receiving element 11, obtain digital medium-frequency signal.The digital medium-frequency signal that obtains by the 12 pairs of radio frequency signal receiving units in Digital Down Convert unit carries out down-converted, obtains digital baseband signal.Carry out upconversion process by the 14 pairs of digital baseband signals in Digital Up Convert unit, obtain digital medium-frequency signal.Digital medium-frequency signal is modulated into radiofrequency signal and launches by emission of radio frequency signals unit 15.
The embodiment of the invention has increased self-excitation and has offseted device 13 on the basis of the above-mentioned existing unit module of digital high-frequency amplification station.Self-excitation offsets device 13 and gathers first digital baseband signal and second digital baseband signal after himself is handled that Digital Down Convert unit 12 obtains, carry out the nonlinear model estimation of transceiver coupling channel according to first digital baseband signal and second digital baseband signal, obtain estimated parameter, according to the estimated parameter that obtains, first digital baseband signal to input carries out the self adaptation real-time operation, obtain reflecting the base band offseting signal of the nonlinear channel characteristic of transceiver feedback channel, in first baseband signal, deduct the base band offseting signal carrying out signal cancellation, thereby avoided digital high-frequency amplification station to produce self-excitation phenomena.Wherein first digital baseband signal is the digital baseband signal before self-excitation offsets, and second digital baseband signal is the digital baseband signal after self-excitation offsets.
The self-excitation that Fig. 2 shows the embodiment of the invention to be provided offsets the structure of device 13, for convenience of explanation, only shows the part relevant with the embodiment of the invention.
This self-excitation offsets device 13 and comprises digital baseband signal collecting unit 131, estimator 132, nonlinear filter 133 and self-excitation offset unit 134.
Wherein Digital Down Convert unit and Digital Up Convert unit are Digital Down Convert unit 12 and the Digital Up Convert unit 14 in the digital high-frequency amplification station shown in Figure 1.The Digital Down Convert unit is converted into first digital baseband signal with digital medium-frequency signal.The Digital Up Convert unit up-converts to digital medium-frequency signal with the digital baseband signal that self-excitation offsets after the processing.
Baseband signal collecting unit 131 is gathered first digital baseband signal and second digital baseband signals, and will gather first digital baseband signal and second digital baseband signal merges, and obtains exercise reference digital baseband signal.This exercise reference digital baseband signal exports estimator 132 to.Wherein first digital baseband signal is to carry out the self-excitation counteracting to handle digital baseband signal before, and second digital baseband signal is to carry out self-excitation to offset processing digital baseband signal afterwards.Baseband signal collecting unit 131 is by carrying out multiple connection with first digital baseband signal and second digital baseband signal, thereby first digital baseband signal and second digital baseband signal are advanced to merge, and obtains exercise reference digital baseband signal.
Illustrate as follows: first digital baseband signal is 16 bit wides, and second digital baseband signal is 16 bit wides, and then with after first digital baseband signal and the second digital baseband signal multiple connection, the exercise reference digital baseband signal that obtains is 32 bit wides.
The information that has wherein comprised transceiver feedback channel characteristic in first digital baseband signal and second digital baseband signal, gather first digital baseband signal and second digital baseband signals by baseband signal collecting unit 131, can obtain self-excitation offset before the information of transceiver feedback channel characteristic and the information that self-excitation offsets back transceiver feedback channel characteristic.
The exercise reference digital baseband signal that estimator 132 obtains according to baseband signal collecting unit 131 is carried out the nonlinear model of transceiver coupling channel and is estimated, obtains each parameter of nonlinear filter.Each parameter of this nonlinear filter is transferred to nonlinear filter 133.Wherein each parameter of nonlinear filter includes but not limited to each linear dimensions in the nonlinear filter, i.e. each nonlinear parameter in A (n) and the nonlinear filter, i.e. B (p).The main effect of A (n) is the linear distortion amount of revising in the transceiver coupling channel, and the main effect of B (p) is the non-linear distortion volume of revising in the transceiver coupling channel.In embodiments of the present invention, owing to increased B (p) parameter, offset effect thereby reached better self-excitation to revise the non-linear distortion volume in the transceiver coupling channel.
Wherein estimator 132 is according to exercise reference digital baseband signal, and the nonlinear model that generally adopts gradient method to carry out transceiver coupling channel is estimated, obtains each parameter of nonlinear filter.
In another embodiment of the present invention, the nonlinear model that estimator 132 can also adopt the sample estimation technique to carry out transceiver coupling channel estimates that obtain the feedback channel transfer function, its detailed process is as described below:
A, determine N+1 parameter sample at random for N load transfer function coefficient, each parameter sample all comprises N load transfer function coefficient;
B, obtain optimum sample in N+1 parameter sample, described optimum sample is to make the signal of repeater output signal through obtaining behind this parameter sample, and the parameter sample of the error minimum between the input signal of repeater;
C, obtain the suboptimum sample in N+1 parameter sample, described suboptimum sample is to make the signal of repeater output signal through obtaining behind this parameter sample, and the error between the input signal of repeater is only second to the parameter sample of minimal error;
D, obtain difference sample in N+1 parameter sample, described difference sample is to make the signal of repeater output signal through obtaining behind this parameter sample, and the parameter sample of the error maximum between the input signal of repeater;
E, calculate the mid point of optimum sample and suboptimum sample, make the reflection sample of difference sample for this mid point;
F, measure the pairing target function value of reflection sample, if, then will reflect sample rollback preset value on original reflection direction greater than the target function value of optimum sample correspondence; If less than the target function value of optimum sample correspondence, then will reflect the sample preset value that on original reflection direction, advances;
G, repeating step b to f, up to the relative error of the target function of optimum sample and difference sample correspondence less than a predefined minimum;
H, optimum sample are the extraneous load transfer function coefficient of being asked, the nonlinear filter parameter that just need estimate.
Wherein x (t) is first digital baseband signal, and y (t) is the base band offseting signal, and t is the time, and N is a linear filter length, and P is the nonlinear factor size, the parameter of the nonlinear filter that A (n), B (p) estimator 132 obtain.
Compare with existing linear filter, following formula nonlinear filter 133 is except comprising existing linear filter item
Also increase and comprise the nonlinear filter item outward,
Thereby can approach the characteristic of the nonlinear device (as power amplifier etc.) in the transceiver feedback channel more accurately, effectively reduce the influence of interference signal, reach better self-excitation and offset effect.
Self-excitation offsets base band offseting signal y (t) that unit 134 obtains according to nonlinear filter 133 and carries out feedback signal and offset processing.The process that feedback signal offsets processing is specially: deduct base band offseting signal y (t) in the first digital baseband signal x (t), obtain second digital baseband signal.
In embodiments of the present invention, in concrete digital high-frequency amplification station is used, needing in advance, the initial value of nonlinear filter 133 is set to 0, promptly when initialization, not output of nonlinear filter 133, at this moment, it is straight-through that self-excitation offsets 134 pairs first digital radio signals in unit, and first digital radio signal and second digital radio signal are numerically identical.
When above-mentioned self-excitation being offseted device be applied to the described digital high-frequency amplification station of Fig. 1, the end that goes out of Digital Down Convert unit 12 is connected with the end of going into that digital baseband signal collecting unit 131, nonlinear filter 133 and self-excitation offset unit 134 respectively, Digital Up Convert unit 14 go into going out to hold and being connected of end and self-excitation offset unit 134.
The self-excitation that Fig. 3 shows the embodiment of the invention to be provided offsets the realization flow of method, and details are as follows:
In step S301, gather and merge first digital baseband signal and second digital baseband signal, obtain exercise reference digital baseband signal.
Wherein first digital baseband signal is the digital baseband signal before self-excitation offsets, and second digital baseband signal is the digital baseband signal after self-excitation offsets.Include the information of transceiver feedback channel in first digital baseband signal and second digital baseband signal, by gathering first digital baseband signal and second digital baseband signal, can obtain self-excitation offset before the information of transceiver feedback channel and self-excitation offset the information of back transceiver feedback channel.
In embodiments of the present invention, adopt the mode of multiple connection that first digital baseband signal and second digital baseband signal are merged.
In step S302, carry out the nonlinear model of transceiver coupling channel according to exercise reference digital baseband signal and estimate, obtain each parameter of nonlinear filter.
Wherein each parameter of nonlinear filter includes but not limited to each linear dimensions in the nonlinear filter, i.e. each nonlinear parameter in A (n) and the nonlinear filter, i.e. B (p).
In embodiments of the present invention, the nonlinear model that can adopt gradient method to carry out transceiver coupling channel is estimated, obtains each parameter of nonlinear filter.The nonlinear model that also can adopt the sample estimation technique to carry out transceiver coupling channel is estimated, obtains the feedback channel transfer function.Wherein the concrete steps of the sample estimation technique do not repeat them here as mentioned above.
In step S303, each parameter according to the nonlinear filter that obtains is carried out the self adaptation real-time operation, obtain reflecting each parameter A of nonlinear filter (n), the B (p) of the nonlinear channel characteristic of transceiver feedback channel, these parameters are passed to nonlinear filter 133.
In embodiments of the present invention, 133 couples first digital baseband signal x of nonlinear filter (t) carry out the calculation process of following formula, obtain base band offseting signal y (t):
Wherein x (t) is first digital baseband signal, and y (t) is the base band offseting signal, and t is the time, and N is a linear filter length, and P is the nonlinear factor size, the parameter of the nonlinear filter that A (n), B (p) estimator 132 obtain.
In step S304, according to the base band offseting signal y (t) that first digital baseband signal and nonlinear filter 133 obtain, carry out signal cancellation and handle, obtain second digital baseband signal.Wherein the process of signal cancellation processing is specially: deduct base band offseting signal y (t) in the first digital baseband signal x (t), obtain second digital baseband signal.
In embodiments of the present invention, by offset the digital baseband signal after preceding digital baseband signal and self-excitation offset according to self-excitation, carrying out the nonlinear model of transceiver coupling channel estimates, obtain each parameter of nonlinear filter, nonlinear filter carries out nonlinear filtering according to each parameter that obtains to be handled, obtain base band offseting signal y (t), offset processing by carry out self-excitation according to this signal, thereby can approach the characteristic of the nonlinear device (as power amplifier etc.) in the transceiver feedback channel more accurately, effectively reduced the influence of interference signal, reached better self-excitation and offset effect.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a self-excitation offsets method, it is characterized in that described method comprises the steps:
Collection also merges first digital baseband signal and second digital baseband signal, obtain exercise reference digital baseband signal, described first digital baseband signal is the digital baseband signal before self-excitation offsets, and described second digital baseband signal is the digital baseband signal after offseting;
Carry out the nonlinear model of transceiver coupling channel according to described exercise reference digital baseband signal and estimate, obtain each parameter of nonlinear filter;
Each parameter according to described nonlinear filter is carried out the self adaptation real-time operation, obtains reflecting the base band offseting signal of the nonlinear channel characteristic of transceiver feedback channel, and it is specially:
Wherein x (t) is first digital baseband signal, and y (t) is the base band offseting signal, and t is the time, and N is a linear filter length, and P is the nonlinear factor size, and A (n), B (p) are the parameter of described nonlinear filter;
Carry out the signal cancellation processing according to described first baseband signal and base band offseting signal, obtain second digital baseband signal.
2. the method for claim 1 is characterized in that, described first digital baseband signal and described second digital baseband signal comprise the information of transceiver feedback channel characteristic.
3. the method for claim 1 is characterized in that, each parameter of described nonlinear filter comprises the linear dimensions of revising the linear distortion amount in the transceiver coupling channel and the nonlinear parameter of revising the non-linear distortion volume in the transceiver coupling channel.
4. the method for claim 1 is characterized in that, when described merging first digital baseband signal and second digital baseband signal, adopts the mode of multiple connection to merge described first digital baseband signal and second digital baseband signal.
5. the method for claim 1 is characterized in that, the nonlinear model that adopts the gradient method or the sample estimation technique to carry out transceiver coupling channel is estimated, obtains each parameter of nonlinear filter.
6. method as claimed in claim 5 is characterized in that, the nonlinear model that adopts the sample estimation technique to carry out transceiver coupling channel estimates that the step that obtains each parameter of nonlinear filter is specially:
A, determine N+1 parameter sample at random for N load transfer function coefficient, each parameter sample all comprises N load transfer function coefficient;
B, obtain optimum sample in N+1 parameter sample, described optimum sample is to make the signal of repeater output signal through obtaining behind this parameter sample, and the parameter sample of the error minimum between the input signal of repeater;
C, obtain the suboptimum sample in N+1 parameter sample, described suboptimum sample is to make the signal of repeater output signal through obtaining behind this parameter sample, and the error between the input signal of repeater is only second to the parameter sample of minimal error;
D, obtain difference sample in N+1 parameter sample, described difference sample is to make the signal of repeater output signal through obtaining behind this parameter sample, and the parameter sample of the error maximum between the input signal of repeater;
E, calculate the mid point of optimum sample and suboptimum sample, make the reflection sample of difference sample for this mid point;
F, measure the pairing target function value of reflection sample, if, then will reflect sample rollback preset value on original reflection direction greater than the target function value of optimum sample correspondence; If less than the target function value of optimum sample correspondence, then will reflect the sample preset value that on original reflection direction, advances;
G, repeating step b to f, up to the relative error of the target function of optimum sample and difference sample correspondence less than a predefined minimum;
H, optimum sample are the data of the extraneous transfer function of being asked.
7. a self-excitation offsets device, it is characterized in that described device comprises:
Digital baseband signal collecting unit, be used for gathering and merging first digital baseband signal and second digital baseband signal, obtain exercise reference digital baseband signal, described first digital baseband signal is the digital baseband signal before self-excitation offsets, and described second digital baseband signal is the digital baseband signal after offseting;
Estimator, the exercise reference digital baseband signal that is used for obtaining according to described digital baseband signal collecting unit carry out the nonlinear model of transceiver coupling channel to be estimated, obtains each parameter of nonlinear filter;
Nonlinear filter, each parameter that is used for the nonlinear filter that obtains according to described estimator, first digital baseband signal to input carries out the self adaptation real-time operation, obtains reflecting the base band offseting signal of the nonlinear channel characteristic of transceiver feedback channel, and it is specially:
Wherein x (t) is first digital baseband signal, and y (t) is the base band offseting signal, and t is the time, and N is a linear filter length, and P is the nonlinear factor size, and A (n), B (p) are the parameter of described nonlinear filter;
The self-excitation offset unit is used for obtaining base band offseting signal and described first digital baseband signal according to described nonlinear filter and carries out signal cancellation and handle, and obtains second digital baseband signal.
8. digital high-frequency amplification station, comprise the radiofrequency signal receiving element, the Digital Down Convert unit, Digital Up Convert unit and emission of radio frequency signals unit, it is characterized in that, described digital high-frequency amplification station comprises that also the described self-excitation of claim 7 offsets device, and described self-excitation offsets device and is connected with described Digital Down Convert unit, Digital Up Convert unit respectively.
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