CN102025674A - Method and device for relieving clipping noise interference - Google Patents

Method and device for relieving clipping noise interference Download PDF

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Publication number
CN102025674A
CN102025674A CN2009100934320A CN200910093432A CN102025674A CN 102025674 A CN102025674 A CN 102025674A CN 2009100934320 A CN2009100934320 A CN 2009100934320A CN 200910093432 A CN200910093432 A CN 200910093432A CN 102025674 A CN102025674 A CN 102025674A
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peak clipping
carrier wave
frequency band
noise
filter
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李凡龙
劳锦明
毕文仲
白炜
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ZTE Corp
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ZTE Corp
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Priority to CN2009100934320A priority Critical patent/CN102025674A/en
Priority to PCT/CN2009/075817 priority patent/WO2011032338A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2623—Reduction thereof by clipping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio

Abstract

The invention discloses a method for relieving clipping noise interference, which comprises: determining if there are carriers of which the frequency bands are continuous among the carriers to be clipped; and if there are carriers of which the frequency bands are continuous among the carriers to be clipped, clipping the carriers of which the frequency bands are continuous by selecting a clipping filter which can at least cover all bandwidth of the carriers of which the frequency bands are continuous. The invention also discloses a device for clipping noise interference, which comprises a determining unit, a first selecting unit and a clipping unit, wherein the determining unit is used for determining if there are carriers of which the frequency bands are continuous among the carriers to be clipped and triggering the selecting unit if there are carriers of which the frequency bands are continuous among the carriers to be clipped; the first selecting unit is used for selecting the clipping filter which can at least cover all bandwidth of the carriers of which the frequency bands are continuous; and the clipping unit is used for clipping the carriers of which the frequency bands are continuous by using the clipping filter selected by the first selecting unit. The method and the device can well relieve the interference of clipping noise with signal performance in a wireless communication system, further improve clipping capacity and reduce the peak-to-average ratio of a signal.

Description

Reduce the method and apparatus of peak clipping noise jamming
Technical field
The present invention relates to reduce after the carrier wave peak clipping technology of peak clipping noise, relate in particular to a kind of method and apparatus that reduces the peak clipping noise jamming.
Background technology
Present wireless communication system multipotency is supported the multicarrier mode of operation, and the multicarrier mode of operation is meant emission and receives all will be the ripple that closes of a plurality of single carriers.Each single carrier adopts the higher biphase phase shift keying (BPSK of the availability of frequency spectrum more, Binary Phase Shift Keying), Quadrature Phase Shift Keying (QPSK, Quadrature Phase Shift Keying), octal system phase-shift keying (8PSK, 8Phase Shift Keying), 16 quadrature amplitude modulation (16QAM, 16Quadrature Amplitude Modulation) modulation system such as, these modulation systems are not only modulated the phase place of carrier wave, also the amplitude of carrier wave is modulated, therefore, these single-carrier signal are closed will obtain behind the ripple changes in amplitude very fast and bigger close the ripple signal.The normal mode of average power that adopts is weighed this size of closing the ripple signal power in wireless communication system, the ratio of normal employing peak value and average is weighed the size of amplitude, the ratio of peak value and average is referred to as peak-to-average force ratio (PAR, Peak-to-Average Power Ratio).In the wireless communication system, along with the increase of carrier number, what big peak-to-average force ratio will occur closes the ripple signal.And bigger peak-to-average force ratio must propose higher linear requirement to semiconductor device in the systems such as power amplifier.When being operated in the inelastic region, can produce serious intermodulation component, in band, can cause the interference between carrier signal, and outside band, can produce serious spectral re-growth, band external system signal be produced disturb if the range of linearity of semiconductor device is limited.
The base band passage portion of signal in wireless communication system can guarantee by the mode that improves data bit width the linearity of path to guarantee that the peak-peak of data can not surpass the dominant bit wide region that can represent.And for analog channel, just requiring has enough rollbacks to signal, guarantees that the peak-peak of signal can not enter in the nonlinear area of each device of path.In base station system, the rollback amount of simulation small-signal path devices at different levels can guarantee the linear amplification to signal generally all greater than 15dB, but for the final stage amplifying unit---for the power amplifier, because cost and efficiency factor, its rollback amount can not have so high.Because higher rollback will have a strong impact on the transmitting power of signal and the operating efficiency of power amplifier.Reduce signal peak-to-average ratio radio system has been proposed higher requirement, the technology by certain that is necessary reduces the peak-to-average force ratio of signal.Peak clipping is exactly to finish the comparatively effective method that peak-to-average force ratio reduces at numeric field in the present wireless system.Fig. 1 is before the peak clipping and the power output schematic diagram of power amplifier operation after the peak clipping, and as shown in Figure 1, carrier signal carries out having improved the power output of power amplifier significantly after the peak clipping, thereby has improved the operating efficiency of power amplifier.
Yet the front is mentioned in some wireless communication systems as cdma communication system, and signal is also modulated the amplitude of carrier wave, and peak clipping will influence quality of signals as a kind of method of cutting down amplitude, influences the decoding performance of signal.The quality of gauge signal can recently be weighed with noise, the signal to noise ratio height, and the signal quality height, easily decoding, on the contrary signal to noise ratio is low, and signal quality is low, is not easy decoding.So the peak clipping process will be to have introduced the peak clipping noise, thus the signal to noise ratio of reduction signal.So, when adopting peak clipping to improve power amplification efficiency, be necessary to reduce of the interference of peak clipping noise to signal, so just can give full play to the effect of peak clipping, improve power efficiency to greatest extent.
At present, the effective processing method of peak clipping noise after the still unmatchful peak clipping of industry.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and apparatus that reduces the peak clipping noise jamming, can obviously reduce the interference of peak clipping noise to carrier signal.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that reduces the peak clipping noise jamming comprises:
Determine to treat whether have the continuous carrier wave of frequency band in each carrier wave of peak clipping, select for use the peak clipping filter that can cover continuous all bandwidth of carrier wave of described frequency band at least that the continuous carrier wave of described frequency band is carried out peak clipping when existing.
Preferably, described method also comprises:
For carrier wave, select for use the big peak clipping filter of peak clipping filter gain that described carrier wave to the peak clipping insensitive for noise is carried out peak clipping to the carrier wave of peak clipping noise-sensitive to the peak clipping insensitive for noise.
Preferably, described method also comprises:
For the discontinuous carrier wave of frequency band, select for use the peak clipping filter of the bandwidth that can cover the discontinuous carrier wave of described frequency band that the continuous carrier wave of described frequency band is carried out peak clipping.
Preferably, described method also comprises:
For the discontinuous carrier wave of frequency band, select for use the big peak clipping filter of peak clipping filter gain of the continuous carrier wave of more described frequency band that the continuous carrier wave of described frequency band is carried out peak clipping.
Preferably, the type of continuous each carrier wave of frequency band is identical.
Preferably, described peak clipping filter generates the peak clipping pulse signal in the bandwidth of its support, and the ripple signal that closes of described peak clipping pulse signal and corresponding carriers is superposeed.
Preferably, the type of described carrier wave comprises 1X carrier wave or the EV-DO carrier wave in the CDMA systems, and described carrier wave to the peak clipping insensitive for noise is the 1X carrier wave.
A kind of device that reduces the peak clipping noise jamming comprises:
Determining unit is used for determining whether each carrier wave for the treatment of peak clipping exists the continuous carrier wave of frequency band, triggers when existing and selects the unit for use;
First selects the unit for use, is used to select for use the peak clipping filter that can cover continuous all bandwidth of carrier wave of described frequency band at least; And
The peak clipping unit is used to utilize described first to select for use the selected peak clipping filter in unit that the continuous carrier wave of described frequency band is carried out peak clipping.
Preferably, described device also comprises:
Second selects the unit for use, be used for for carrier wave the peak clipping insensitive for noise, select the big peak clipping filter of peak clipping filter gain to the carrier wave of peak clipping noise-sensitive for use, described peak clipping unit by using described second selects for use the selected peak clipping filter in unit that described carrier wave to the peak clipping insensitive for noise is carried out peak clipping.
Preferably, described device also comprises:
The 3rd selects the unit for use, is used for selecting the peak clipping filter of the bandwidth that can cover the discontinuous carrier wave of described frequency band for use for the discontinuous carrier wave of frequency band; Described peak clipping unit by using the described the 3rd selects for use the selected peak clipping filter in unit that the continuous carrier wave of described frequency band is carried out peak clipping.
Preferably, the described the 3rd selects for use the unit for the discontinuous carrier wave of frequency band, selects the big peak clipping filter of peak clipping filter gain of the continuous carrier wave of more described frequency band for use.
Preferably, the type of continuous each carrier wave of frequency band is identical.
Preferably, described peak clipping unit comprises:
The pulse signal generation unit is used to utilize described peak clipping filter to generate the peak clipping pulse signal in the bandwidth of its support; And
Superpositing unit is used for the ripple signal that closes of described peak clipping pulse signal and corresponding carriers is superposeed.
Preferably, the type of described carrier wave comprises 1X carrier wave or the EV-DO carrier wave in the CDMA systems, and described carrier wave to the peak clipping insensitive for noise is the 1X carrier wave.
Among the present invention, when carrier signal is carried out peak clipping, judge and whether have the continuous signal of frequency band in the carrier signal, if exist, then adopt the peak clipping filter that covers all bandwidth of continuous carrier at least that it is carried out peak clipping, select the peak clipping filter of wider bandwidth for use, make between the carrier bandwidths and also can carry the peak clipping pulse, under the certain situation of noise power, the intensity of the noise signal in the whole bandwidth is reduced relatively, thereby reduced the interference of noise signal in each carrier bandwidths; And for discrete carrier wave, if its susceptibility to the peak clipping noise is lower, then can select for use the bigger peak clipping filter of gain that this discrete carrier wave is carried out peak clipping, the signal strength signal intensity of the peak clipping noise in this discrete carrier wave is improved, under the certain situation of whole peak clipping noise intensity, reduced the peak clipping noise signal strength in other carrier waves, like this, make the intensity of the peak clipping noise in each carrier wave be reduced to suitable relatively scope, thereby reduce of the interference of peak clipping noise carrier signal.The present invention can reduce preferably that the peak clipping noise further improves the peak clipping ability to the interference of signal performance in the wireless communication system, reduces the peak-to-average force ratio of signal.Thereby reached the efficient of power amplifier in the further raising wireless communication system, the power output of power amplifier and the coverage of sub-district.Improve the transmission rate and the service quality of sub-district, improve user's experience.
Description of drawings
Fig. 1 is before the peak clipping and the power output schematic diagram of power amplifier operation after the peak clipping;
Fig. 2 is the peak clipping principle schematic;
Fig. 3 is for adopting the principle schematic of cancellation pulses peak clipping;
Fig. 4 drops into the interior schematic diagram of carrier signal band for the peak clipping noise that produces after the peak clipping;
Fig. 5 is the peak clipping noise schematic diagram that four carrier waves are produced after the peak clipping when disposing continuously;
Fig. 6 reduces the flow chart of the method embodiment one of peak clipping noise jamming for the present invention;
The peak clipping noise schematic diagram that Fig. 7 produces after to the carrier wave peak clipping for peak clipping filter of the present invention;
Fig. 8 reduces the flow chart of the method embodiment two of peak clipping noise jamming for the present invention;
The peak clipping noise schematic diagram that Fig. 9 produces after to the carrier wave peak clipping for peak clipping filter of the present invention;
Figure 10 reduces the composition structural representation of the device of peak clipping noise jamming for the present invention.
Embodiment
Basic thought of the present invention is: when carrier signal is carried out peak clipping, judge and whether have the continuous signal of frequency band in the carrier signal, if exist, then adopt the peak clipping filter that covers all bandwidth of continuous carrier at least that it is carried out peak clipping, select the peak clipping filter of wider bandwidth for use, make between the carrier bandwidths and also can carry the peak clipping pulse, under the certain situation of noise power, the intensity of the noise signal in the whole bandwidth is reduced relatively, thereby reduced the interference of noise signal in each carrier bandwidths; And for discrete carrier wave, if its susceptibility to the peak clipping noise is lower, then can select for use the bigger peak clipping filter of gain that this discrete carrier wave is carried out peak clipping, the signal strength signal intensity of the peak clipping noise in this discrete carrier wave is improved, under the certain situation of whole peak clipping noise intensity, reduced the peak clipping noise signal strength in other carrier waves, like this, make the intensity of the peak clipping noise in each carrier wave be reduced to suitable relatively scope, thereby reduce of the interference of peak clipping noise carrier signal.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
In the modern wireless communication systems performance demands that transmits being mainly reflected in two aspects, is the quality of signal itself on the one hand, can the side's of being received demodulation easily come out, and is called performance in the band.Require signal other signal not to be produced on the other hand and disturb, promptly require the outer index of signal band better, be called the outer performance of band.And the purpose of peak clipping is exactly to reduce the peak-to-average force ratio of signal, Fig. 2 is the peak clipping principle schematic, as shown in Figure 2, the basic principle of peak clipping is exactly that the peak value that surpasses specified thresholds in the signal is eliminated, make its peak level reach the setting power scope, the signal that adopts despiker directly to treat peak clipping among the figure carries out peak clipping, and its peak value is reduced in the threshold value of setting, wherein, N represents the difference of signal peak power after peak clipping previous peaks power and the peak clipping.
In peak clipping, to reduce as much as possible the carrier signal performance indexes, the particularly influence of the outer index of band, so the noise limit of all the peak clipping process being introduced in present numerous despicking method is in signal bandwidth, adopted at present is the method that the peak clipping pulse is offset more, promptly reaches the purpose that reduces peak-to-average force ratio by the pulse that the peak clipping front signal is deducted a counteracting.The generation of cancellation pulses is decided by two aspects, one be as shown in Figure 2 signal peak and the difference N of thresholding, another is that cancellation pulses is limited in filter in the signal band, is referred to as the peak clipping filter.Fig. 3 is for adopting the principle schematic of cancellation pulses peak clipping, as shown in Figure 3, adopt the cancellation pulses maker to generate a cancellation pulses, promptly it has been carried out peak clipping after superposeing with the carrier signal for the treatment of peak clipping, the peak value of the carrier signal after the peak clipping is reduced in the threshold value of setting, signal delay device among the figure is that the carrier signal for the treatment of peak clipping postpones to handle, make its and cancellation pulses just in time in the drawings joint close ripple (stack) processing, thereby reach the purpose of peak clipping.
Fig. 4 drops into the interior schematic diagram of carrier signal band for the peak clipping noise that produces after the peak clipping, as shown in Figure 4, show the peak clipping noise signal (dash area among the figure) after the four carrier wave peak clippings that centre frequency is respectively f1, f2, f3 and f4, control the size of cancellation pulses by the difference of signal peak and setting thresholding, by the peak clipping filter pulse of offsetting has been limited in the band of signal, thereby the outer performance of the band that can not have influence on carrier signal, but cancellation pulses is exactly a noise for signal, will have influence on the performance in the signal band.So, claim that also cancellation pulses is the peak clipping noise.
Provide the simple expression formula of peak clipping process below.The thresholding of supposing peak clipping is B, at t 0The peak value that constantly detects input signal is A, and the signal before the peak clipping is that the signal after x (t) peak clipping is that y (t) is so at t 0Moment y (t 0) can be expressed as:
y ( t 0 ) = ( x ( t 0 ) - ( A - B ) × δ ( t - t 0 ) ) ⊗ H ( t 0 )
What H in the formula (t) represented is the impulse response of peak clipping filter, (A-B) * and δ (t-t 0) what represent is cancellation pulses,
Figure B2009100934320D0000062
What represent is convolution.Because the peak clipping filter can not exert an influence to the performance of signal, so y (t 0) also can be expressed as:
y ( t 0 ) = x ( t 0 ) - ( A - B ) × δ ( t - t 0 ) ⊗ H ( t 0 )
Wherein
Figure B2009100934320D0000064
Being exactly the expression formula of cancellation pulses, also is the expression formula of peak clipping noise.So just can reach the purpose that changes peak clipping noise size by the characteristic of adjusting peak clipping filters H (t).
The method of reduction peak clipping noise jamming provided by the invention is exactly to revise the characteristics such as bandwidth, gain of peak clipping filter dynamically according to band information (center frequency point and bandwidth), carrier type and the carrier number of carrier wave configuration, finally reach noise total after the peak clipping is reasonably distributed according to the susceptibility of carrier wave to the peak clipping noise, make the peak clipping noise after the peak clipping reach minimum, reduce the purpose of peak clipping noise effect of signals thereby also reached to performance index influence in the band of carrier signal.
Below further illustrate this point by concrete example.
This example describes with the situation that four carrier waves dispose continuously.The center frequency point that four continuous carriers are set is respectively f1, f2, f3 and f4.The bandwidth of each carrier wave has different requirements in different wireless communication systems, be 1.23M as the bandwidth that requires each carrier wave in the cdma system.At receiving terminal is that each carrier wave is carried out demodulation respectively.When carrier wave is carried out peak clipping, selecting the principle of peak clipping filter is to use a peak clipping filter all the time according to the signal bandwidth of single carrier in the wireless communication system, the signal bandwidth of promptly selecting bandwidth width and single carrier for use the quite peak clipping filter of (slightly wide than signal bandwidth) is right, and the characteristic of the single carrier peak clipping filter of at every turn selecting for use is always fixing.Fig. 5 is the peak clipping noise schematic diagram that four carrier waves are produced after the peak clipping when disposing continuously, as shown in Figure 5, peak clipping filter after passing through in this example to synthesize as shown in phantom in Figure 5, the peak clipping filter can not produce signal and disturb, so its bandwidth is slightly larger than the bandwidth of signal, solid line is depicted as carrier signal among Fig. 5.He Cheng peak clipping filter makes the noise major part after the peak clipping all drop in the band of signal like this, and signal is produced larger interference.And after adopting the method for the present invention's proposition, the peak clipping filter of the peak clipping noise jamming that just can be reduced.
Fig. 6 reduces the flow chart of the method embodiment one of peak clipping noise jamming for the present invention, and as shown in Figure 6, the method that this example reduces the peak clipping noise jamming may further comprise the steps:
Step 601: the band information and the characteristic information that obtain each carrier wave in the wireless communication system.
In this example four carrier waves, centre frequency is respectively f1, f2, f3 and f4, is the carrier wave in code division multiple access (CDMA, the Code Division Multiple Access) system, bandwidth is 1.23M, and the type of carrier wave is as being 1X carrier wave or EV-DO carrier wave in cdma system.Because 1X is different to the susceptibility of peak clipping noise with the EV-DO carrier wave, so can separately select the peak clipping filter.Suppose in this example all be four in the cdma system the 1X carrier wave or all be four EV-DO carrier waves in the cdma system.
Step 602: carrier wave is carried out classification and ordination, determine whether each carrier wave is continuous.Carrier wave is sorted from big to small by its frequency band, suppose that ranking results is f4, f3, f2 and f1.Can calculate spacing frequency between the carrier wave according to the band information of each carrier wave, whether can judge each carrier wave according to the centre frequency of carrier wave and bandwidth information is continuous configuration, be special case in this example, all carrier waves are configuration continuously, do not have the situation of discontinuous carrier.
Step 603: the bandwidth that the peak clipping filter is set covers the bandwidth of using carrier wave at least.For the situation of continuous carrier, the bandwidth that the peak clipping filter then is set can cover all bandwidth of above-mentioned four carrier waves at least.The peak clipping noise schematic diagram that Fig. 7 produces after to the carrier wave peak clipping for peak clipping filter of the present invention, as shown in Figure 7, dotted line is a big peak clipping filter of the present invention among the figure, its bandwidth has covered the bandwidth of all four carrier waves, after adopting the bigger peak clipping filter of bandwidth of the present invention, make the part that in Fig. 5, can not carry the peak clipping noise between the peak clipping filter also can carry the peak clipping noise, obviously increased the capacity that holds the peak clipping noise, and total peak clipping noise is certain, so, make that the noise in each carrier bandwidths is reduced significantly, thereby reached the purpose that reduces the peak clipping noise jamming.
Step 604: the peak clipping filter that current peak clipping filter is defined as each carrier wave.Be about in the step 603 determined peak clipping filter as the whole peak clipping filter of above-mentioned continuous four carrier waves.
The operation principle that it will be appreciated by those skilled in the art that peak clipping filter of the present invention is identical with the principle of peak clipping filter shown in Figure 3, unique different be the bandwidth difference of its support, the present invention repeats no more its operation principle.
Fig. 8 reduces the flow chart of the method embodiment two of peak clipping noise jamming for the present invention, and as shown in Figure 8, the method that this example reduces the peak clipping noise jamming may further comprise the steps:
Step 801: the band information and the characteristic information that obtain each carrier wave in the wireless communication system.
In this example five carrier waves, centre frequency is respectively f1, f2, f3, f4 and f5, is the carrier wave in code division multiple access (CDMA, the Code Division Multiple Access) system, bandwidth is 1.23M, and the type of carrier wave is as being 1X carrier wave or EV-DO carrier wave in cdma system.Because 1X is different to the susceptibility of peak clipping noise with the EV-DO carrier wave, so can separately select the peak clipping filter.Suppose one of them carrier discrete configuration in this example, and four other carrier waves are configuration continuously, f1 is set is configured to the 1X carrier wave, what f2, f3, f4 and f5 disposed is the EV-DO carrier wave.
Step 802: carrier wave is carried out classification and ordination, determined whether continuous carrier.Carrier wave is sorted from big to small by its frequency band, suppose that ranking results is f5, f4, f3, f2 and f1.Can calculate spacing frequency between the carrier wave according to the band information of each carrier wave, centre frequency and bandwidth information according to carrier wave can be judged the situation whether each carrier wave exists continuous configuration, carrier wave f5, f4, f3, f2 are configuration continuously in this example, and arranged discrete between carrier wave f1 and the f2, promptly centre frequency is that the carrier wave of f1 is a discontinuous carrier.
Step 803: for continuous carrier, the bandwidth that the peak clipping filter is set covers the bandwidth of using carrier wave at least, for discontinuous and to the carrier wave of peak clipping insensitive for noise, for it selects the bigger peak clipping filter of gain for use.The peak clipping noise schematic diagram that Fig. 9 produces after to the carrier wave peak clipping for peak clipping filter of the present invention, as shown in Figure 9, carrier wave f5 for continuous configuration, f4, f3, f2, select the peak clipping filter of a broader bandwidth for use, its bandwidth has covered carrier wave f5, f4, f3, all bandwidth of f2, behind the bigger peak clipping filter of continuous carrier employing bandwidth, make the part that in Fig. 5, can not carry the peak clipping noise between the peak clipping filter also can carry the peak clipping noise, obviously increased the capacity that holds the peak clipping noise, and total peak clipping noise is certain, so, make carrier wave f5, f4, f3, noise among the f2 in each carrier bandwidths is reduced significantly, thereby has reached the purpose that reduces the peak clipping noise jamming.And for discontinuous carrier f1, because it is the 1X carrier wave, insensitive than the EV-DO carrier wave to noise signal, that is to say, can bear bigger peak clipping noise in this carrier wave, therefore, can be this carrier wave and select the bigger peak clipping filter of gain for use, make the intensity of the peak clipping noise in the carrier wave f1 more relatively large, under the certain situation of peak clipping noise intensity, overall noise intensity in carrier wave f5, f4, f3, the f2 promptly can descend, thereby makes the peak clipping noise in each carrier wave band reach relatively reasonable level, makes the interference to each carrier wave be reduced to minimum.For the peak clipping filter of single carrier, still select for use and filter shown in Figure 3, just at different carrier waves, the gain difference of selecting for use.
In the above-mentioned example, if carrier wave f5, f4, f3, f2 are the 1X carrier wave, and f1 is the EV-DO carrier wave, then for after continuous carrier selects the peak clipping filter that covers whole continuous carrier bandwidth for use, also can further improve its gain, make the intensity of the peak clipping noise on f5, f4, f3, the f2 carrier wave more, and reduce the peak clipping noise on the EV-DO carrier wave of noise-sensitive.Certainly, also can be defaulted as discontinuous carrier wave to the peak clipping insensitive for noise, owing to have bandwidth granularity between itself and the continuous carrier, therefore concerning UE, disturb less relatively, can suitably increase the gain of its peak clipping filter, if continuous carrier f5, f4, f3, f2 are the 1X carrier wave, and f1 is the EV-DO carrier wave, also can improve the gain of the peak clipping filter of f1.
Step 804: the peak clipping filter that current peak clipping filter is defined as each carrier wave.Be about in the step 603 determined peak clipping filter as the whole peak clipping filter of above-mentioned continuous four carrier waves.
Figure 10 reduces the composition structural representation of the device of peak clipping noise jamming for the present invention, as shown in figure 10, the device that the present invention reduces the peak clipping noise jamming comprises that determining unit 1001, first selects unit 1002 and peak clipping unit 1003 for use, wherein, determining unit 1001 is used for determining whether each carrier wave for the treatment of peak clipping exists the continuous carrier wave of frequency band, triggers first when existing and selects unit 1002 for use; First selects for use unit 1002 to be used to select for use the peak clipping filter that can cover continuous all bandwidth of carrier wave of described frequency band at least; Peak clipping unit 1003 is used to utilize first to select for use the selected peak clipping filter in unit that the continuous carrier wave of described frequency band is carried out peak clipping.Wherein, the type of continuous each carrier wave of frequency band is identical.The type of carrier wave comprises 1X carrier wave or the EV-DO carrier wave in the CDMA systems.
As shown in figure 10, the device that the present invention reduces the peak clipping noise jamming comprises that also second selects unit 1004 for use, be used for for carrier wave the peak clipping insensitive for noise, select the big peak clipping filter of peak clipping filter gain to the carrier wave of peak clipping noise-sensitive for use, peak clipping unit 1003 utilizes second to select for use unit 1004 selected peak clipping filters that described each carrier wave is carried out peak clipping.
As shown in figure 10, the device that the present invention reduces the peak clipping noise jamming comprises that also the 3rd selects unit 1005 for use, is used for selecting the peak clipping filter of the bandwidth that can cover the discontinuous carrier wave of described frequency band for use for the discontinuous carrier wave of frequency band; Peak clipping unit 1003 utilizes the 3rd to select for use unit 1005 selected peak clipping filters that the continuous carrier wave of described frequency band is carried out peak clipping.The 3rd selects for use unit 1005 for the discontinuous carrier wave of frequency band, selects the big peak clipping filter of peak clipping filter gain of the continuous carrier wave of more described frequency band for use.
As shown in figure 10, peak clipping of the present invention unit 1003 also comprises pulse signal generation unit 10030 and superpositing unit 10031, and wherein, pulse signal generation unit 10030 is used to utilize described peak clipping filter to generate the peak clipping pulse signal in the bandwidth of its support; Superpositing unit 10031 is used for the ripple signal that closes of described peak clipping pulse signal and described each carrier wave is superposeed.
Those skilled in the art are to be understood that, the device of the reduction peak clipping noise jamming that the present invention is shown in Figure 10 is to design for the method that realizes aforementioned reduction peak clipping noise jamming, the realization function of the each processing unit in the device shown in Figure 10 can be understood with reference to the associated description in the method for aforementioned reduction multicarrier phase mutual interference, the function of each unit can realize by the program that runs on the processor, also can realize by corresponding logical circuit.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (14)

1. a method that reduces the peak clipping noise jamming is characterized in that, comprising:
Determine to treat whether have the continuous carrier wave of frequency band in each carrier wave of peak clipping, select for use the peak clipping filter that can cover continuous all bandwidth of carrier wave of described frequency band at least that the continuous carrier wave of described frequency band is carried out peak clipping when existing.
2. method according to claim 1 is characterized in that, described method also comprises:
For carrier wave, select for use the big peak clipping filter of peak clipping filter gain that described carrier wave to the peak clipping insensitive for noise is carried out peak clipping to the carrier wave of peak clipping noise-sensitive to the peak clipping insensitive for noise.
3. method according to claim 1 and 2 is characterized in that, described method also comprises:
For the discontinuous carrier wave of frequency band, select for use the peak clipping filter of the bandwidth that can cover the discontinuous carrier wave of described frequency band that the continuous carrier wave of described frequency band is carried out peak clipping.
4. method according to claim 3 is characterized in that, described method also comprises:
For the discontinuous carrier wave of frequency band, select for use the big peak clipping filter of peak clipping filter gain of the continuous carrier wave of more described frequency band that the continuous carrier wave of described frequency band is carried out peak clipping.
5. method according to claim 4 is characterized in that the type of each carrier wave that frequency band is continuous is identical.
6. method according to claim 5 is characterized in that, described peak clipping filter generates the peak clipping pulse signal in the bandwidth of its support, and the ripple signal that closes of described peak clipping pulse signal and corresponding carriers is superposeed.
7. method according to claim 1 and 2 is characterized in that, the type of described carrier wave comprises 1X carrier wave or the EV-DO carrier wave in the CDMA systems, and described carrier wave to the peak clipping insensitive for noise is the 1X carrier wave.
8. a device that reduces the peak clipping noise jamming is characterized in that, comprising:
Determining unit is used for determining whether each carrier wave for the treatment of peak clipping exists the continuous carrier wave of frequency band, triggers when existing and selects the unit for use;
First selects the unit for use, is used to select for use the peak clipping filter that can cover continuous all bandwidth of carrier wave of described frequency band at least; And
The peak clipping unit is used to utilize described first to select for use the selected peak clipping filter in unit that the continuous carrier wave of described frequency band is carried out peak clipping.
9. device according to claim 8 is characterized in that, described device also comprises:
Second selects the unit for use, be used for for carrier wave the peak clipping insensitive for noise, select the big peak clipping filter of peak clipping filter gain to the carrier wave of peak clipping noise-sensitive for use, described peak clipping unit by using described second selects for use the selected peak clipping filter in unit that described carrier wave to the peak clipping insensitive for noise is carried out peak clipping.
10. according to Claim 8 or 9 described devices, it is characterized in that described device also comprises:
The 3rd selects the unit for use, is used for selecting the peak clipping filter of the bandwidth that can cover the discontinuous carrier wave of described frequency band for use for the discontinuous carrier wave of frequency band; Described peak clipping unit by using the described the 3rd selects for use the selected peak clipping filter in unit that the continuous carrier wave of described frequency band is carried out peak clipping.
11. device according to claim 10 is characterized in that, the described the 3rd selects for use the unit for the discontinuous carrier wave of frequency band, selects the big peak clipping filter of peak clipping filter gain of the continuous carrier wave of more described frequency band for use.
12. device according to claim 11 is characterized in that, the type of each carrier wave that frequency band is continuous is identical.
13. device according to claim 12 is characterized in that, described peak clipping unit comprises:
The pulse signal generation unit is used to utilize described peak clipping filter to generate the peak clipping pulse signal in the bandwidth of its support; And
Superpositing unit is used for the ripple signal that closes of described peak clipping pulse signal and corresponding carriers is superposeed.
14. according to Claim 8 or 9 described devices, it is characterized in that the type of described carrier wave comprises 1X carrier wave or the EV-DO carrier wave in the CDMA systems, described carrier wave to the peak clipping insensitive for noise is the 1X carrier wave.
CN2009100934320A 2009-09-21 2009-09-21 Method and device for relieving clipping noise interference Pending CN102025674A (en)

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