CN1726655A - Chip level phase adjustment - Google Patents
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- H04B1/707—Spread spectrum techniques using direct sequence modulation
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Abstract
In a CDMA on a WCDMA system, the phase correction is performed at a chip level ie. Before the Walsh and the user-PN despreading. The correction is carried out performing the dot product between the despreaded pilot signals and the received data signal not despreaded.
Description
The cross reference of related application
The U.S. Provisional Patent Application of submitting to before the application requires 60/418,188 (submission on October 15th, the 2002) submission date early.In addition, the application relates to and owning together and common unsettled U.S. Patent application No.##/### that the application submits to simultaneously, ### (U.S. Provisional Patent Application No.60/418, on October 15th, 187,2002 submitted to).Above-listed each in open is all attached, and this is for referencial use.
Background of invention
1. invention field
Relate generally to communicator of the present invention.More particularly, the present invention relates to such as code division multiple access (" CDMA ") signal or wideband CDMA signal (" WCDMA ") the phase place adjustment of spread-spectrum signal.CDMA signaling and WCDMA signaling are well-known in prior art.
2. correlation technique discussion
Adopt various modulation schemes such as the communication system of frequency-expanding CDMA that uses in the cellular telephone industry.The example of some modulation comprises Quadrature Phase Shift Keying (" QPSK like this ") and two-phase PSK (" BPSK ").Those skilled in the art has been understood the modulation scheme of QPSK and BPSK.The emission of these spread spectrum systems transmits expansion at part radio frequency (" RF ") signal of numerical data on the frequency spectrum.For example, the CDMA signal launched transmits numerical data, the latter with general more much higher data rate than basic data speed, utilize pseudorandom (" PN ") data carry out " scatter " or " expansion ".Therefore, basic data be expanded when not doing so big again and again in.The PN sign indicating number that is used for the signal of communication spread spectrum is that those skilled in the art is known.
As what use in cellular telephone industry, the base station is to such as user's set CDMA signal transmitted such as cell phones.Itself can be the QPSK signal for described signal, comprises in-phase component and quadrature component, also is called I and Q component respectively.Numerical data can be by one in these I and the Q component or both transmission.In user receiving device by I is come despreading (despread) with Q with the identical PN code combination that is used for the data spread spectrum.Thereby user's set extracts described data, and is converted into for example required form such as voice.In cellular example, the extraction of data can comprise described data with such as orthogonal code series of combination such as Walsh code trains.For example, basic data can comprise a plurality of channels.As used herein, channel is meant the bits of coded of using such as orthogonal code spread spectrums such as Walsh codes.Same orthogonal code is used for being used for extracting data at receiver side subsequently in the emitting side coded data.
Can send reference signal together with data such as transmitters such as base station transmitters, be called pilot signal.Pilot signal is generally as the phase reference that receives data.For example, pilot signal can be used for the phase place adjustment of QPSK signal or rotate to predetermined phase quadrant, makes basic data correctly to recover.Because pilot signal is Data transmission not generally, and use zero series to encode, so pilot signal is present in the single predetermined phase quadrant.Correspondingly, if detecting pilot signal is in incorrect phase quadrant, then can rotate to correct phase quadrant to the phase place of described pilot signal (thereby basic data).
A kind of like this method of phase place rotation also claims carrier phase recovery, exist in prior art, but the data of these methods single channel in they are used for basic data works in symbol level when recovering.For example, a kind of prior art system after these I and Q signal component are by despreading immediately each combination in Walsh code sequence and I and the Q signal component.Aspect the channel amplitude that these systems are selected being defined as the data recovery is effective.But,, just need a plurality of Walsh sign indicating numbers in order to determine the amplitude of a plurality of channels.These extra Walsh sign indicating numbers cause the complexity of system, because need more assembly (for example, filter, accumulator and multiplier).In addition, because each channel all will multiply each other Walsh sign indicating number and I and Q component,, consumed more disposal ability owing to extract a plurality of channels.The example of rotatable phase and the system that uses with these data of extracting individual channel is shown in U.S. Patent No. 5,506 for example, and 865 (on April 9th, 1996 issued; " ' 865 patents ") and U.S. Patent No. 6,396,804 (on May 28th, 2002 issued, " ' 804 patents ").Although the prior art system is particularly useful in the data of extracting single channel, they do not provide interference cancellation capability basically.In such as spread spectrum systems such as above-mentioned cellular cdma systems, reducing from aspect the interference in other sources, Interference Cancellation can be useful.The example of such interference source comprises the energy leakage from other channels that some can make selected quality of channel descend.Leakage may be that the error of calculation by the modulation of down converted and/or received signal causes.Correspondingly, interference cancellation receiver can be used for assisting to isolate and extracting each interior channel of spread-spectrum signal.The prior art example of interference cancellation receiver comprises U.S. Patent No. 5,930,229 (on July 27th, 1999 issued) and U.S. Patent No. 5,872,776 (on February 16th, 1999 issued); These examples can be so that provide the background information of usefulness.
It is invalid that the phase place of some prior art system is rotated in the Interference Cancellation aspect, because each channel all needs a plurality of code trains to extract data in the given signal.For example, aspect the isolation desired channel, each undesired channel all is considered to the potential interference source to desired channel; Therefore, must discern undesired channel, just can resist any potential interference, thereby can correctly extract data from desired channel.Because each channel all needs its code train to extract data, so the complexity of receiver has just improved inevitably owing to increase the extraction required different assemblies of data.
Abstract of invention
The invention provides a kind of system that can rotate and adjust the phase place of signal.In one embodiment, system comprises phase compensator, and it is configured to adjust the phase place of described signal according to after the filtering of signal first component and unfiltered expression formula and according to after the filtering of signal second component and unfiltered expression formula.For example, phase compensator can be by after the filtering and a plurality of vector products of unfiltered I and Q component adjusted I of phase place and Q component that the QPSK signal is provided.Described system also comprises detector, and it is connected to one or more outputs of described phase compensator with communication mode and is configured to first and second components and code train combination, so that determine the magnitude of energy of channel.
In one aspect of the invention, system comprises: phase compensator, it be configured to according to after the filtering of signal first component and unfiltered expression formula and according to after the filtering of signal second component and unfiltered expression formula adjust the phase place of described signal; And detector, it is connected to one or more outputs of described phase compensator with communication mode and is configured to first and second components and code train combination, so that determine the magnitude of energy of channel.
In another aspect of the present invention, first component is an in-phase component, and it meets following formula basically:
I＝(I
Unfiltered·K·cosΦ)+(Q
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of in-phase component, Kcos Φ is the filtered expression formula of in-phase component, Q
UnfilteredBe the unfiltered expression formula of quadrature component, Ksin Φ is the filtered expression formula of quadrature component.
In another aspect of the present invention, second component is a quadrature component, and it meets following formula basically:
Q＝(Q
Unfiltered·K·cosΦ)+(I
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of in-phase component, Kcos Φ is the filtered expression formula of in-phase component, Q
UnfilteredBe the unfiltered expression formula of quadrature component, Ksin Φ is the filtered expression formula of quadrature component.
In another aspect of the present invention, described code train is the Walsh code train.
In another aspect of the present invention, described detector comprises one or more code train generators, and each code train generator all is configured to produce unique code train.
In another aspect of the present invention, described detector also comprises: first multiplier, and it is connected to the code train generator with communication mode and is configured to first component and the combination of one or more code train, to produce first component of combination; And second multiplier, it is connected to the code train generator with communication mode, and is configured to a second component and the combination of one or more code train, to produce the second component of combination.
In another aspect of the present invention, described detector also comprises accumulator, it is connected to first and second multipliers with communication mode, sue for peace in order to first component in symbol duration to combination, so that produce first sign level data, and the second component to combination in symbol duration is sued for peace, so that produce second sign level data.
In another aspect of the present invention, described detector comprises Fast W alsh converter unit, and the latter is configured to first and second components and the combination of a plurality of Walsh code train, so that determine the magnitude of energy of one or more single channels.
In one aspect of the invention, the method of adjusting signal phase comprises: adjusted first component of phase place that produces described signal, its method is: filtered first component that unfiltered first component of described signal be multiply by described signal, so that first product is provided, the unfiltered second component of described signal be multiply by the filtered second component of described signal, so that second product is provided, and respond described multiplying each other and described first sum of products, second product combination, so that produce adjusted first component of phase place; And the adjusted second component of the phase place that produces described signal, its method is: filtered first component that the unfiltered second component of described signal be multiply by described signal, so that the 3rd product is provided, unfiltered first component of described signal be multiply by the filtered second component of described signal, so that the 4th product is provided, and respond described multiplying each other and the 3rd sum of products the 4th product combination, so that produce the adjusted second component of phase place, the step that wherein produces adjusted first component of phase place and the adjusted second component of generation phase place has been adjusted the phase place of described signal.
In another aspect of the present invention, the step that makes up first and second products comprises the first and second product additions.
In another aspect of the present invention, described addition step comprises provides the phase place that has following form basically adjusted second component:
I＝(I
Unfiltered·K·cosΦ)+(Q
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of in-phase component, Kcos Φ is the filtered expression formula of in-phase component, Q
UnfilteredBe the unfiltered expression formula of quadrature component, Ksin Φ is the filtered expression formula of quadrature component.
In another aspect of the present invention, the step that makes up described third and fourth product comprises from the 3rd product and deducts the 4th product.
In another aspect of the present invention, described subtraction step comprises provides the phase place that has following form basically adjusted second component:
Q＝(Q
Unfiltered·K·cosΦ)-(I
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of in-phase component, Kcos Φ is the filtered expression formula of in-phase component, Q
UnfilteredBe the unfiltered expression formula of quadrature component, Ksin Φ is the filtered expression formula of quadrature component.
In another aspect of the present invention, the step that produces adjusted first component of phase place comprises: in the substantially the same time first sum of products, second product is latched into sum unit.
In another aspect of the present invention, the step that produces the adjusted second component of phase place comprises: in the substantially the same time the 3rd sum of products the 4th product is latched into subtrator.
In one aspect of the invention, the system that is used to adjust signal phase comprises: be used to produce the device of adjusted first component of phase place of described signal, described device comprises and is used for unfiltered first component of described signal be multiply by filtered first component of described signal so that the device of first product is provided, be used for the unfiltered second component of described signal be multiply by the filtered second component of described signal so that the device of second product is provided, with be used to respond described multiply each other step and first and second product combination to produce the device of adjusted first component of phase place; And the device that is used to produce the adjusted second component of phase place of described signal, described device comprises and is used for the unfiltered second component of described signal be multiply by filtered first component of described signal so that the device of the 3rd product is provided, be used for unfiltered first component of described signal be multiply by the filtered second component of described signal so that the device that provides the 4th product to use, with be used to respond described multiply each other step and third and fourth product combination to produce the device of the adjusted second component of phase place, wherein, the step of adjusted first component of generation phase place and the adjusted second component of generation phase place has been adjusted the phase place of described signal.
In another aspect of the present invention, the device that is used to make up first and second products comprises the device that is used for first product and the second product addition.
In another aspect of the present invention, the device that is used for described addition step comprises the device that is used to provide the adjusted second component of phase place that has following form basically:
I＝(I
Unfiltered·K·cosΦ)+(Q
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of in-phase component, Kcos Φ is the filtered expression formula of in-phase component, Q
UnfilteredBe the unfiltered expression formula of quadrature component, Ksin Φ is the filtered expression formula of quadrature component.
In another aspect of the present invention, the device that is used to make up third and fourth product comprises the device that is used for deducting from the 3rd product the 4th product.
In another aspect of the present invention, the device that is used for described subtraction step comprises the device that is used to provide the adjusted second component of phase place that has following form basically:
Q＝(Q
Unfiltered·K·cosΦ)-(I
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of in-phase component, Kcos Φ is the filtered expression formula of in-phase component, Q
UnfilteredBe the unfiltered expression formula of quadrature component, Ksin Φ is the filtered expression formula of quadrature component.
In another aspect of the present invention, the device that is used to produce adjusted first component of phase place comprises the device that is used in the substantially the same time first sum of products, second product being latched into sum unit.
In another aspect of the present invention, the device that is used to produce adjusted first component of phase place comprises the device that is used in the substantially the same time the 3rd sum of products the 4th product being latched into subtrator.
In one aspect of the invention, a kind of method of processing signals comprises: adjust the phase place of described signal first component by repeatedly multiplying each other, the operand of described repeatedly multiplication comprises the filtered and unfiltered expression formula of signal first component and the filtered and unfiltered expression formula of signal second component, to produce adjusted first component of phase place; Adjust the phase place of described signal second component by repeatedly multiplying each other, the operand of described repeatedly multiplication comprises the filtered and unfiltered expression formula of signal first component and the filtered and unfiltered expression formula of signal second component, so that produce the adjusted second component of phase place; Adjusted first component of phase place and adjusted second component of phase place and code train combination, so that determine the magnitude of energy of channel.
In another aspect of the present invention, the phase place step of adjusting first component comprises the product addition by the generation of multiplying each other, so that produce adjusted first component of phase place that has following form basically:
I＝(I
Unfiltered·K·cosΦ)+(Q
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of in-phase component, Kcos Φ is the filtered expression formula of in-phase component, Q
UnfilteredBe the unfiltered expression formula of quadrature component, Ksin Φ is the filtered expression formula of quadrature component.
In another aspect of the present invention, the step of adjusting the phase place of second component comprises the product addition by the generation of multiplying each other, so that produce the adjusted second component of phase place that has following form basically:
Q＝(Q
Unfiltered·K·cosΦ)-(I
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of in-phase component, Kcos Φ is the filtered expression formula of in-phase component, Q
UnfilteredBe the unfiltered expression formula of quadrature component, Ksin Φ is the filtered expression formula of quadrature component.
In one aspect of the invention, a kind of system comprises: despreader, and it is configured to first and second components of signal are carried out despreading; Bank of filters, it is connected to despreader with communication mode and is configured to carries out filtering to first component and the second component of described signal, with the filtered expression formula that produces first component and the filtered expression formula of second component; And phase compensator, it is connected to despreader and bank of filters and is configured to adjusts the phase place of described signal according to the filtered expression formula of first and second components and according to the unfiltered expression formula of first and second components.
Brief Description Of Drawings
Fig. 1 illustrates the block diagram of prior art system;
Fig. 2 illustrates the block diagram of the system in the one embodiment of the invention;
Fig. 3 illustrates the block diagram of the system in the another embodiment of the present invention;
Fig. 4 illustrates the block diagram of the phase compensator in the one embodiment of the invention;
Fig. 5 illustrates the block diagram of the system in the another embodiment of the present invention; And
Fig. 6 illustrates the flow chart of the example of the inventive method embodiment.
The detailed description of accompanying drawing
Although the present invention can take many modifications and alternative form, its some specific embodiments now are shown with way of example, and in this detailed description.But should understand that this is not to be intended to the present invention is limited to disclosed concrete form, but the present invention contains and has covered changes all in the defined spirit and scope of claims, equivalence and alternative.
Fig. 1 illustrates the block diagram of prior art system 100.System 100 is band spread receivers, and it extracts data from the I and the Q data flow of the QPSK signal that received.System 100 comprises QPSK despreader 102, and it utilizes the PN sign indicating number that I and Q data flow are carried out despreading.I behind the gained despreading and Q data flow are offered filter 104-I and 104-Q respectively.Filter 104-I and 104-Q carry out filtering to I and Q data flow respectively.The filtered output of filter 104-I and 104-Q is used as the benchmark of described signal carrier phase subsequently.
Also the I of gained and Q data flow are offered logic multiply musical instruments used in a Buddhist or Taoist mass 109-I and 109-Q respectively.Multiplier 109-I and 109-Q carry out mould two and addition to I behind the despreading and Q data flow respectively with Walsh sign indicating number 110.Correspondingly, Walsh sequencer 103 provides Walsh sign indicating number 110 to two multiplier 109-I and 109-Q.Thereby multiplier 109-I and 109-Q offer accumulator 105-I and 105-Q to mould 2 and I afterwards and Q data flow respectively.Such logical mathematics is well-known to those skilled in the art.Subsequently, accumulator 105-I and 105-Q are respectively to being added up by the position of multiplier 109-I and 109-Q coding and the predetermined number that provides.Accumulator also is well-known to those skilled in the art.Channel data is represented in the unfiltered I of accumulator 105-I and 105-Q and the output of Q data flow.
Each data flow separately among filter 104-I and 104-Q and accumulator 105-I and the 105-Q sends dot product module 106 to.Dot product module 106 produces postrotational data sample, and described sample is used by processor 108 subsequently, and is described as ' 865 patent.For example, dot product module 106 produces pilot signal vector and the dot-product of data signal vector in the I-Q coordinate space.Dot-product meets following formula:
PD=|P||D|cos θ (equation 1)
P is a pilot signal vector in the formula, and D is a data signal vector, and θ is two angles between the vector.Described equation can be with the formal representation of vector component:
PD=P
ID
I+ P
QXD
Q(equation 2)
The I and the Q component of the vector that subscript I and Q representative are associated.These equations relate to the phase place rotation on the symbolic base of QPSK signal.For example, phase place rotation is that the symbol to described signal carries out, and a plurality of positions of each symbology wherein are such as two of each symbols in the QPSK signal.
Though described in the patent of ' 865, it is useful that 100 pairs of single channels of system extract data, in the time will extracting a plurality of channel, the complexity of system 100 increases.Although specifically be not used for Interference Cancellation (' 865 patents), system 100 is invalid in such application, at first because deleted a plurality of channels.For example, Walsh sign indicating number 110 is to select for specific channel specially.In order to detect more channel, must realize extra Walsh sign indicating number.This increase of Walsh sign indicating number increases the quantity of filter, accumulator and multiplier in the described system, because used the Walsh sign indicating number before rotatable phase.
Fig. 2 illustrates the block diagram of the system 200 in the one embodiment of the invention.System 200 comprises phase compensator 201, and the latter is configured to according to the filtered and unfiltered expression formula of QPSK signal I component and adjusts the phase place of signal according to the filtered and unfiltered expression formula of signal Q component.For example, phase compensator 201 not only receives the filtered expression formula of I component but also receives unfiltered expression formula.Phase compensator 201 also receives the filtered and unfiltered expression formula of Q component.These I and Q component can be the result data stream of QPSK despreading.Phase compensator 201 can multiply each other the different combination of these inputs, so that adjust the phase place of these I and Q component.When adjusting phase place, phase compensator 201 can be determined the side-play amount of angle in the phase place according to the product of these multiplyings.So phase compensator 201 can compensate described signal, make and to consider undesirable phase place rotation.A kind of like this compensation can equal the symbol phase rotation towards required quadrant.Because the phase place adjustment can (for example, not made up under the situation of Walsh sign indicating number, carry out afterwards as shown in Figure 1), carry out so phase place is adjusted on the basis of chip-scale at despreading.Its chips is the information unit on basis, is well-known to those skilled in the art.
In addition, system 200 comprises the detector 202 that is connected to phase compensator 201 by link 203 with communication mode.For example, link 203 can be represented one or more outputs of phase compensator 201, and described output outputs to detector 202 to adjusted I of phase place and Q.Detector 202 is configured to an I and Q component and the combination of one or more code train, so that determine the magnitude of energy of one or more channels.For example, detector 202 can be from the adjusted I of the phase place of phase compensator 201 and Q component and the combination of Walsh code train.Therefore, detector 202 can provide phase place adjusted (for example, postrotational) and utilize the I and the Q component of code train coding, and this allows to determine by extra processing the magnitude of energy of other channels in the described range of signal.
Although be useful in data extract, system 200 is useful especially as interference cancellation systems.For example, can determine the channel energy amplitude of a plurality of channels by a plurality of code train additions.Form contrast with the prior art system 100 of Fig. 1, can be added to system 200 at little big following a plurality of code trains of situation that increase the complexity of described system.In this embodiment, adjust the combination of laggard line code series and adjusted I of phase place and Q component in phase place.Thereby as I and Q data flow, the multiplication that be undertaken by phase compensator 201 seldom.
Fig. 3 illustrates the block diagram of the system 300 in the another embodiment of the present invention.In described embodiment, system 300 can advantageously require to be used for band spread receiver, I and Q component that described band spread receiver uses chip type multiplication (chip-wise multiply) to find the solution basic data.
I
FilteredX=Kcos Φ (equation 3)
In the formula Kcos Φ be filtered I component mathematic(al) representation and
Q
Filtered=Ksin Φ (equation 4)
Ksin Φ is the mathematic(al) representation of filtered Q component in the formula.Usually, COEFFICIENT K is called scale factor, represents the intensity of reference signal (that is, pilot signal).In one embodiment, use phase-locked loop (" PLL ") or the phase reference of unit scale, so K may be thought of as a unit or 1.Angle Φ can think to represent the residual carrier phase place of the angle of the side-play amount (for example, undesirable phase place rotation) that departs from the emission value.For example, owing to such as down converted and/or from the energy level of other channels in the signal may " leakage " and cause the error of calculation that angular deflection produces.Therefore, described angular deflection amount can be represented the variation of the expection energy level that leaves these channels.Those skilled in the art is understood that the derivation of these mathematic(al) representations.Filter 302-I and 302-Q can be digital filters, sample value ground the sample value of the data flow of I and Q are carried out filtering one by one with digital form.
In case combination, multiplier 309-I and 309-Q just send combined I and Q component 316 and 317 to accumulator 305 respectively.Accumulator 305 correspondingly adds up the component 3 16 and 317 of combination or sue for peace in symbol duration, to produce sign level data.At last, described sign level data is handled by processor 306, and described processor itself is determined the energy level amplitude of different channels in the described signal and/or the phase pushing figure of described signal.
Although the specified level with regard to details illustrates,, the embodiment of system 300 does not plan to be limited to described illustrating, but only is defined by the claims.For example, being used for the embodiment that the single channel data are recovered, can use single Walsh generator.
Fig. 4 illustrates the block diagram of the phase compensator 400 in the one embodiment of the invention.Phase compensator 400 can adopt the phase compensator 303 used modes that are similar to Fig. 3 that signal is carried out the phase place adjustment.In described one exemplary embodiment, use a plurality of latch 402-408 to latch the filtered and unfiltered expression formula of I and Q data flow in identical with each latch reception basically identical time of latch enable signal LATCHENABLE.
Described I and Q data flow are latched to multiplier 410-416, so that produce the various different products of input signal.For example, multiplier 410 produces (I
UnfilteredKsin Φ) product, multiplier 412 produces (I
UnfilteredKcos Φ) product, multiplier 414 produces (Q
UnfilteredKcos Φ) product, and multiplier 416 produces (Q
UnfilteredKsin Φ) product.By latch 418-424 these four products are latched into subtracter 426 and adder 428 then.Subtracter 426 and adder 428 produce adjusted I of phase place and Q component to these product combination, and they meet following equation:
I=(I
UnfilteredKcos Φ)+(Q
UnfilteredKsin Φ) (equation 5) and
Q=(Q
UnfilteredKcos Φ)-(I
UnfilteredKsin Φ) (equation 6)
Adjusted I of these phase places and Q component representative are by I and Q component 314 and 315 of phase regulator 303 generations of Fig. 3.So adjusted I of phase place and Q component do not have PN sign indicating number or residual carrier phase place.These I and Q component generally are used for the magnitude determinations of channel.Such calculating can be by carrying out such as 306 processors of the processor among Fig. 3.
Although be expressed as a plurality of multipliers, latch, subtracter and adder, the professional and technical personnel is understood that, can adopt the combination of other unit, and this also within the scope of the invention.For example, can use a multiplier, rather than 4.Thereby, can carry out multichannel to the input of such multiplier and switch.
Fig. 5 illustrates the block diagram of the system 500 in the another embodiment of the present invention.In described embodiment, each multiplier 309-I and 309-Q and Walsh sequence 304 that the 500 usefulness Fast W alsh of system conversion 501 replaces among Fig. 3.The phase place adjustment is still carried out like that by phase compensator 303 image patterns 3.Yet in described embodiment, Fast W alsh conversion 501 can be made up a plurality of Walsh sign indicating numbers, thus the multiplication process by finishing by multiplier 309-I and 309-Q before the matrix computations quickening.At U.S. Provisional Patent Application No.60/418, a kind of like this use of Walsh conversion 501 is disclosed in 187 (submissions on October 15th, 2002).
Fig. 6 illustrates the flow chart of the example of method embodiment 600 of the present invention.In described embodiment, utilize first and second components of described signal, adjust the phase place of signal such as the various different products of the I of QPSK signal and Q component.Each component all carries out the phase place adjustment in unit 601 and 611.Each unit 601 and 611 all comprises extra feature, so that provide this phase place adjusted component.When producing adjusted first component of phase place (for example, unit 601), in unit 602, unfiltered first component of described signal be multiply by filtered first component of described signal.In addition, in unit 603, the unfiltered second component of described signal be multiply by the filtered second component of described signal.Then, assembled unit 602 and 603 product in unit 604 produce adjusted first component of phase place.Such combination can comprise the addition of these products, produces the component shown in Fig. 4 equation 5.
Similarly, in unit 611, the unfiltered second component of described signal multiply by filtered first component in unit 612, and unfiltered first component of described signal multiply by filtered second component in unit 613.Then, these two products make up in unit 614, produce the adjusted second component of phase place.The adjusted component of two phase places of this that provides in unit 604 and 614 produces the adjusted signal of phase place.For example, utilize first component and the second component of representing the I component of QPSK signal of the I component of representing the QPSK signal, adjusted I of phase place and Q component provide phase place confirmable signal, make to adjust to required quadrant to basic pilot signal phase.
In one embodiment, described method comprises wherein the unit of the adjusted I of phase place and Q component and the combination of one or more code train.Such code train can comprise the Walsh sign indicating number, and it can be used for detecting the one or more channels in the described signal.Such Channel Detection can advantageously require to be used for the cdma cellular telephone system, especially for such as in the user's sets such as cell phone.
In the embodiment of a recommendation, can synchronously carry out each multiplication unit.But the present invention does not plan to be limited to and carries out multiplication.For example, multiplication can carry out with time-sharing format, and wherein product is stored to till multiplication finishes always.In addition, in the embodiment of described recommendation, described multiplication is carried out on sample value ground one by one.Yet other embodiment can comprise the data of depositing predetermined length, so that can carry out the phase place adjustment to the different sections of first and second components simultaneously.
Do not plan these embodiment are limited to CDMA2000 or other cdma systems, because they can be used for the system of any use PSK.For example, the foregoing description can be used for using such as QPSK such as the channel estimating that is used for Interference Cancellation, the data test that is used for definite a plurality of Walsh sign indicating numbers existence and/or multi channel while demodulation.
Be noted that the above embodiment of the present invention can implement with various methods.For example, the foregoing description can use software, firmware, hardware or its any combination to realize.Those skilled in the art are familiar with software, firmware, hardware or its any combination.Correspondingly, those skilled in the art is understood that such implementation is the design alternative problem, should not be limited to specific implementation.
Although, should think that such illustrating and describe is illustrative at above-mentioned accompanying drawing with describe illustrated in detail and described the present invention, and nonrestrictive.Therefore, should be understood that the embodiment that just recommends and a small amount of change the thereof that have illustrated, and the institute that falls into the spirit and scope of the present invention changes and revises and all intend being protected.
Claims (26)
1. system is characterized in that comprising:
Phase compensator, it be configured to according to after the filtering of signal first component and unfiltered expression formula and according to after the filtering of the second component of described signal and unfiltered expression formula adjust the phase place of described signal; And
Detector, it is connected to one or more outputs of described phase compensator with communication mode and is configured to described first and second components and code train combination, so that determine the magnitude of energy of channel.
2. the system as claimed in claim 1, wherein said first component is an in-phase component, it meets following formula basically:
I＝(I
Unfiltered·K·cosΦ)+(Q
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of described in-phase component, Kcos Φ is the filtered expression formula of described in-phase component, Q
UnfilteredBe the unfiltered expression formula of quadrature component, Ksin Φ is the filtered expression formula of described quadrature component.
3. the system as claimed in claim 1, wherein second component is a quadrature component, it meets following formula basically:
Q＝(Q
Unfiltered·K·cosΦ)-(I
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of described in-phase component, Kcos Φ is the filtered expression formula of described in-phase component, Q
UnfilteredBe the unfiltered expression formula of described quadrature component, Ksin Φ is the filtered expression formula of described quadrature component.
4. the system as claimed in claim 1, wherein said code train is the Walsh code train.
5. the system as claimed in claim 1, wherein said detector comprises one or more described code train generators, each described code train generator is configured to produce unique code train.
6. system as claimed in claim 5, wherein said detector also comprises:
First multiplier, it is connected to described code train generator with communication mode and is configured to described first component and one or more described code train combination, to produce first component of combination; With
Second multiplier, it is connected to described code train generator with communication mode and is configured to described second component and one or more described code train combination, to produce the second component of combination.
7. system as claimed in claim 6, wherein said detector also comprises accumulator, described accumulator is connected to described first and second multipliers with communication mode, be used in symbol duration first component summation to described combination, so that produce first sign level data, and the second component to described combination in symbol duration is sued for peace, so that produce second sign level data.
8. the system as claimed in claim 1, wherein said detector comprises Fast W alsh converter unit, the latter is configured to described first and second components and the combination of a plurality of Walsh code train, so that determine the magnitude of energy of one or more unique channels.
9. method of adjusting signal phase is characterized in that comprising:
Produce adjusted first component of phase place, its method is:
Unfiltered first component of described signal be multiply by filtered first component of described signal, so that first product is provided,
The unfiltered second component of described signal be multiply by the filtered second component of described signal, so as to provide second product and
Respond and describedly multiply each other step and make up described second product of described first sum of products, so that produce adjusted first component of the phase place of described signal; And
Produce the adjusted second component of phase place of described signal, its method is:
The unfiltered second component of described signal be multiply by filtered first component of described signal, so that the 3rd product is provided,
Unfiltered first component of described signal be multiply by the filtered second component of described signal, so as to provide the 4th product and
Respond and describedly multiply each other step and make up described the 4th product of described the 3rd sum of products, so that produce the adjusted second component of phase place,
Wherein, the step that produces adjusted first component of described phase place and produce the adjusted second component of described phase place has been adjusted the phase place of described signal.
10. method as claimed in claim 9, the step that wherein makes up described first and second products comprises the described first and second product additions.
11. method as claimed in claim 10, wherein said addition step comprises provides the phase place that has following form basically adjusted second component:
I＝(I
Unfiltered·K·cosΦ)+(Q
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of described in-phase component, Kcos Φ is the filtered expression formula of described in-phase component, Q
UnfilteredBe the unfiltered expression formula of described quadrature component, Ksin Φ is the filtered expression formula of described quadrature component.
12. comprising from described the 3rd product, method as claimed in claim 9, the step that wherein makes up described third and fourth product deduct described the 4th product.
Provide the phase place that has following form basically adjusted second component 13. method as claimed in claim 12, wherein said subtraction step comprise:
Q＝(Q
Unfiltered·K·cosΦ)-(I
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the described unfiltered expression formula of described in-phase component, Kcos Φ is the described filtered expression formula of described in-phase component, Q
UnfilteredBe the described unfiltered expression formula of described quadrature component, Ksin Φ is the described filtered expression formula of described quadrature component.
14. method as claimed in claim 9, the step that wherein produces adjusted first component of described phase place comprises:
Basically simultaneously described second product of described first sum of products is latched into sum unit.
15. method as claimed in claim 9, the step that wherein produces the adjusted second component of described phase place comprises:
Basically simultaneously described the 4th product of described the 3rd sum of products is latched into subtrator.
16. a system that is used to adjust signal phase, it comprises:
Be used to produce the device of adjusted first component of phase place of described signal, described device comprises:
Be used for unfiltered first component of described signal be multiply by filtered first component of described signal so that the device of first product is provided,
Be used for the unfiltered second component of described signal be multiply by the filtered second component of described signal so as to provide second product device and
Be used to respond and describedly multiply each other step and make up described first and second products to produce the device of adjusted first component of described phase place; And
Be used to produce the device of the adjusted second component of phase place of described signal, described device comprises:
Be used for described unfiltered second component be multiply by described filtered first component so that the device of the 3rd product is provided,
Be used for described unfiltered first component be multiply by described filtered second component so as to provide the 4th product device and
Be used to respond and describedly multiply each other step and make up described third and fourth product producing the device of the adjusted second component of described phase place,
Wherein, the step that produces adjusted first component of described phase place and produce the adjusted second component of described phase place has been adjusted the phase place of described signal.
17. system as claimed in claim 16, the device that wherein is used to make up described first and second products comprises the device that is used for described first product is added the above second product.
18. system as claimed in claim 17, the device that wherein is used for described addition step comprises the device that is used to provide the adjusted second component of phase place that has following form basically:
I＝(I
Unfiltered·K·cosΦ)+(Q
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the unfiltered expression formula of described in-phase component, Kcos Φ is the filtered expression formula of described in-phase component, Q
UnfilteredBe the unfiltered expression formula of described quadrature component, Ksin Φ is the filtered expression formula of described quadrature component.
19. system as claimed in claim 16, wherein be used to make up the described the 3rd and the device of described the 4th product comprise the device that is used for deducting described four products from described the 3rd product.
20. system as claimed in claim 19, the device that wherein is used for described subtraction step comprises the device that is used to provide the adjusted second component of phase place that has following form basically:
Q＝(Q
Unfiltered·K·cosΦ)-(I
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the described unfiltered expression formula of described in-phase component, Kcos Φ is the described filtered expression formula of described in-phase component, Q
UnfilteredBe the described unfiltered expression formula of described quadrature component, Ksin Φ is the described filtered expression formula of described quadrature component.
21. system as claimed in claim 16, the device that wherein is used to produce adjusted first component of described phase place comprises
Be used for simultaneously described second product of described first sum of products being latched into basically the device of described sum unit.
22. system as claimed in claim 16, the device that wherein is used to produce adjusted first component of described phase place comprises:
Be used for simultaneously described the 4th product of described the 3rd sum of products being latched into basically the device of subtrator.
23. a method that is used for processing signals, described method comprises:
The phase place of first component of adjusting described signal by repeatedly multiplying each other, the described operand that multiplies each other comprises the filtered and unfiltered expression formula of described first component and comprises the filtered and unfiltered expression formula of the second component of described signal, so that produce adjusted first component of phase place;
The phase place of the second component of adjusting described signal by repeatedly multiplying each other, the described operand that multiplies each other comprises the described filtered and described unfiltered expression formula of described first component and comprises the described filtered and described unfiltered expression formula of described second component, so that produce the adjusted second component of phase place;
Adjusted first component of described phase place and adjusted second component of described phase place and code train combination, so that determine the magnitude of energy of channel.
24. method as claimed in claim 23, the step of wherein adjusting the phase place of described first component comprises the product addition that produces by the described step that multiplies each other, so that produce adjusted first component of described phase place that has following form basically:
I＝(I
Unfiltered·K·cosΦ)+(Q
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the described unfiltered expression formula of described in-phase component, Kcos Φ is the described filtered expression formula of described in-phase component, Q
UnfilteredBe the described unfiltered expression formula of described quadrature component, and Ksin Φ is the described filtered expression formula of described quadrature component.
25. method as claimed in claim 23, the step of wherein adjusting the phase place of described second component comprises the product addition that produces by the described step that multiplies each other, so that produce the adjusted second component of described phase place that has following form basically:
Q＝(Q
Unfiltered·K·cosΦ)-(I
Unfiltered·K·sinΦ)
I in the formula
UnfilteredBe the described unfiltered expression formula of described in-phase component, Kcos Φ is the described filtered expression formula of described in-phase component, Q
UnfilteredBe the described unfiltered expression formula of described quadrature component, and Ksin Φ is the described filtered expression formula of described quadrature component.
26. a system, it comprises:
Despreader, it is configured to first and second components of signal are carried out despreading;
Bank of filters, it is connected to described despreader with communication mode, and be configured to described first component and the described second component of described signal are carried out filtering, with the filtered expression formula that produces described first component and the filtered expression formula of described second component; And
Phase compensator, it is connected to described despreader and described bank of filters, and be configured to adjust the phase place of described signal according to described first and the described filtered expression formula of described second component and according to described first and the unfiltered expression formula of described second component.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US41818802P | 2002-10-15 | 2002-10-15 | |
| US60/418,188 | 2002-10-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1726655A true CN1726655A (en) | 2006-01-25 |
| CN100550664C CN100550664C (en) | 2009-10-14 |
Family
ID=32107903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003801058813A Expired - Fee Related CN100550664C (en) | 2002-10-15 | 2003-10-15 | Chip-level phase adjusting method and system |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1565994A1 (en) |
| JP (1) | JP2006503499A (en) |
| CN (1) | CN100550664C (en) |
| AU (1) | AU2003282858A1 (en) |
| WO (1) | WO2004036783A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006093723A2 (en) | 2005-02-25 | 2006-09-08 | Data Fusion Corporation | Mitigating interference in a signal |
| US7577779B2 (en) * | 2006-02-14 | 2009-08-18 | Broadcom Corporation | Method and system for a RFIC master |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9315845D0 (en) * | 1993-07-30 | 1993-09-15 | Roke Manor Research | Apparatus for use in equipment providing a digital radio link between a fixed and a mobile radio unit |
-
2003
- 2003-10-15 AU AU2003282858A patent/AU2003282858A1/en not_active Abandoned
- 2003-10-15 EP EP03774851A patent/EP1565994A1/en not_active Ceased
- 2003-10-15 JP JP2004545348A patent/JP2006503499A/en active Pending
- 2003-10-15 WO PCT/US2003/032757 patent/WO2004036783A1/en not_active Application Discontinuation
- 2003-10-15 CN CNB2003801058813A patent/CN100550664C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004036783A1 (en) | 2004-04-29 |
| EP1565994A1 (en) | 2005-08-24 |
| CN100550664C (en) | 2009-10-14 |
| JP2006503499A (en) | 2006-01-26 |
| AU2003282858A1 (en) | 2004-05-04 |
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