CN101667844B - Device and method for serial descrambling and de-spreading of mobile communication system - Google Patents

Device and method for serial descrambling and de-spreading of mobile communication system Download PDF

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Publication number
CN101667844B
CN101667844B CN2008101963839A CN200810196383A CN101667844B CN 101667844 B CN101667844 B CN 101667844B CN 2008101963839 A CN2008101963839 A CN 2008101963839A CN 200810196383 A CN200810196383 A CN 200810196383A CN 101667844 B CN101667844 B CN 101667844B
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spreading
de
descrambling
control information
output
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CN2008101963839A
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CN101667844A (en
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王晓东
方明
叶远
朱志明
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傲世通科技(苏州)有限公司
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Abstract

The invention relates to a device and a method for serial descrambling and de-spreading of a mobile communication system. The device is characterized by comprising a local code control information generator, a descrambling and de-spreading unit, a reset time schedule controller and a symbol selector, wherein the local code control information generator generates control information with 2-time code chip rate according to scrambling codes and spreading codes; the descrambling and de-spreading unit performs descrambling and de-spreading on data according to code control information; the reset time schedule controller controls the reset of the descrambling and de-spreading unit; and the symbol selector performs symbol sampling on descrambling and de-spreading results and outputs the descrambling and de-spreading result of a branch, wherein the local code control information generator, the reset time schedule controller and the symbol selector are connected into the descrambling and de-spreading unit respectively. Thus, by using a full adder and an xor device, the multiplication of a code chip, the scrambling codes and spreading codes and the accumulation of the multiplication results of the code chip can be finished at the same time so as to implement the process of descrambling and de-spreading, and the device and the method are suitable for achieving an integrated circuit in the mobile communication system.

Description

The devices and methods therefor that is used for serial descrambling and de-spreading of mobile communication system

Technical field

The present invention relates to a kind of method and device thereof that is used for descrambling and de-spreading, relate in particular to a kind of device that is used for serial descrambling and de-spreading of mobile communication system, belong to technical field of telecommunications.

Background technology

Along with the development of mobile communication technology, when the performance of wireless communication system day by day improved, the complexity of system was also constantly improving.And, realizing the high performance while for the user terminal chip of GSM, also require rational cost and power consumption.

In the wireless communication system of code division multiple access, it is common sample mode that receiver (RAKE) receives.In wireless communication system TD SDMA TD-SCDMA, owing to adopted the mode of joint-detection, the numbers of branches of receiver increases greatly.And in the user terminal baseband chip, it is considerable that the receiver of joint-detection receives the resource that consumes.This shows, if can reduce the complexity of each branch in the receiver, can be very beneficial to the cost and the power consumption of chip.

Specifically, there is multiple implementation method in each branch in the receiver at present.Such as, carry out despreading through fast Walsh-Hadamard transform (FWHF) structure, identical but the scrambler of different branches needs, this is not suitable for the TD-SCDMA user terminal that multi-plot joint detects.Same, if directly take advantage of addition afterwards again, then need multiply by-1 operation through chip data and scrambler spreading code, promptly data are carried out negate and add 1, and I component and Q component add up respectively, relatively take logical resource.Therefore need to adopt a kind of method and apparatus of saving logical resource, reduction system power dissipation and cost to be used for serial descrambling and de-spreading of mobile communication system.

Summary of the invention

The object of the invention is exactly the problems referred to above that exist in the prior art in order to solve, and a kind of device that is used for serial descrambling and de-spreading of mobile communication system is provided.

The object of the invention is realized through following technical scheme:

Be used for the device of serial descrambling and de-spreading of mobile communication system, it comprises: local code control information generator, and it produces the control information of 2 times of spreading rates according to the scrambler spreading code; The descrambling and de-spreading unit, it carries out descrambling and de-spreading according to the sign indicating number control information to data; The zero setting time schedule controller, the zero clearing of its control descrambling and de-spreading unit; Symbol selector, it carries out symbol sampler to the descrambling and de-spreading result, exports the descrambling and de-spreading result of this branch; Local code control information generator, zero setting time schedule controller, symbol selector are connected into the descrambling and de-spreading unit respectively.

The above-mentioned device that is used for serial descrambling and de-spreading of mobile communication system; Wherein: described descrambling and de-spreading unit; Comprise symbol gate, XOR device, full adder and at least 3 d type flip flops, the output of symbol gate is connected into the input of XOR device, and the output of XOR device connects the input of full adder; The input of full adder is connected with second d type flip flop; The output of full adder connects the input of first d type flip flop, and the output of first d type flip flop connects the input of second d type flip flop and 3d flip-flop, and the output of the output of 3d flip-flop and first d type flip flop is as the output of descrambling and de-spreading unit.

The method that is used for serial descrambling and de-spreading of mobile communication system; It is characterized in that may further comprise the steps: step 1.: through local code control information generator, produce symbol gate, the control information of XOR device and the carry signal of full adder 7 according to the scrambler spreading code;

Step is 2.: the control information that the symbol gate produces according to local code control information generator, and the correlated components of gating input chip data, and produce the data of 2 times of spreading rates;

Step is 3.: after bit expanded is done in the control information that the XOR device produces local code control information generator, and the data XOR that produces with symbol selector;

Step is 4.: full adder carries out the sign bit expansion with the result of bit XOR, and the carry-out bit that produces with the accumulation result and the local code control information generator of second d type flip flop feedback subsequently adds entirely;

Step is 5.: the zero setting time schedule controller is exported the zero setting control information of second d type flip flop;

Step is 6.: first d type flip flop and second d type flip flop feed back to full adder after the result of full adder carried out postponing for 2 times;

Step is 7.: the output of first d type flip flop and 3d flip-flop, through the symbol sampler of symbol selector, export with character rate.

Above-mentioned, be used for the method for serial descrambling and de-spreading of mobile communication system, wherein: said step 2. in correlated components be I component and Q component.

Further; The above-mentioned method that is used for serial descrambling and de-spreading of mobile communication system; Wherein: the zero setting time schedule controller operating state of said step in 5. comprises that downstream spread spectrum code is 16 and 1 totally two kinds of situation---when spreading code is 16; During the 1st and 2 clock cycle, the signal of zero setting time schedule controller output is effective in corresponding to 32 clock cycle of a symbol period, the invalidating signal of corresponding to back 30 clock cycle the time, exporting; When spreading code was 1, the signal of all clock cycle output was all effective.

Further, the above-mentioned method that is used for serial descrambling and de-spreading of mobile communication system, wherein: the output of second d type flip flop of said step in is 6. controlled by the output of zero setting time schedule controller.

The outstanding substantive distinguishing features and the obvious improvement of technical scheme of the present invention is mainly reflected in: only need a full adder after adopting the present invention, can accomplish the descrambling and de-spreading of a way word signal I, two components of Q.Its SECO is simple, saves logical resource, is applicable to the realization of application-specific integrated circuit (ASIC).Simultaneously, need not to multiply by-1 operation, saved logical resource, expanded the space for the technological progress of this area, implementation result is good.

Description of drawings

The object of the invention, advantage and characteristics will illustrate through the non-limitative illustration of following preferred embodiment and explain.These embodiment only are the prominent examples of using technical scheme of the present invention, and all technical schemes of taking to be equal to replacement or equivalent transformation and forming all drop within the scope of requirement protection of the present invention.In the middle of these accompanying drawings,

Fig. 1 is a structure, running sketch map of the present invention.

The implication of each Reference numeral is following among the figure:

1 local code control information generator, 2 descrambling and de-spreading unit

3 zero setting time schedule controllers, 4 symbol selectors

5 symbol gates, 6 XOR devices

7 full adders, 8 first d type flip flops

9 second d type flip flops, 10 3d flip-flops

Embodiment

The device that is used for serial descrambling and de-spreading of mobile communication system as shown in Figure 1, its special feature is: include local code control information generator 1, it produces the control information of 2 times of spreading rates according to the scrambler spreading code; Descrambling and de-spreading unit 2, it carries out descrambling and de-spreading according to the sign indicating number control information to data; Zero setting time schedule controller 3, the zero clearing of serial accumulator in its control descrambling and de-spreading unit 2; Symbol selector 4, it carries out symbol sampler to the descrambling and de-spreading result, exports the descrambling and de-spreading result of this branch.Local code control information generator 1, zero setting time schedule controller 3, symbol selector 4 are connected into descrambling and de-spreading unit 2 respectively.And described 2 times of chips comprise the I component of input chip data and the selection control information of Q component, the input signal of XOR unit, the carry input signal of full adder 7.

Further combine Fig. 1; Described descrambling and de-spreading unit 2 comprises symbol selector 4, XOR device 6, full adder 7 and d type flip flop, symbol gate 5 input chip data; The output of symbol gate 5 is connected to the input of XOR device 6; The output of XOR device 6 is connected to the input of full adder 7, and another input of full adder 7 is connected into second d type flip flop 9, and the output of full adder 7 is connected to first d type flip flop 8; The output of first d type flip flop 8 is connected to the input of second d type flip flop 9 and 3d flip-flop 10, and the output of 3d flip-flop 10 is finished the output of this descrambling interface unit with the output of first d type flip flop 8.

Again specifically, first d type flip flop 8 is with the accumulation result preservation of sampling.Second d type flip flop 9, when the control information of zero setting time schedule controller 3 outputs was effective, output zero setting was used for the beginning that a symbol adds up; All the other the time, feed back to full adder 7 with after the accumulation result time-delay, be used for alternately adding up of I component and Q component.And described zero setting time schedule controller 3, the zero setting control information that produces second d type flip flop 9 is used to begin the descrambling and de-spreading of a symbol.3d flip-flop 10 postpones a clock cycle to accumulation result, I component is as a result of exported, with keep with after the Q component output that adds up of clock cycle synchronous.

Real work in conjunction with each parts: symbol selector 4 is through the I component of local code control information generator 1 generation and the selection control information of Q component; Select I component or Q component in the input chip data; Produce the data of 2 times of spreading rates, and the output signal of descrambling and de-spreading unit 2 is carried out exporting with character rate behind the symbol sampler.After the input signal that XOR device 6 produces local code control information generator 1 carries out the bit expansion, carry out the bit XOR with the input data.Full adder 7 at first carries out the sign bit expansion with the result of bit XOR, with the accumulation result of feedback and the carry-out bit of local code control information generator generation, adds entirely subsequently.

Simultaneously; Zero time schedule controller 3 cooperate downstream spread spectrum codes 16 and 1 totally two kinds of situation present the different working state: when spreading code is 16; The the 1st and 2 clock cycle in corresponding to 32 clock cycle of a symbol period; The signal of zero setting time schedule controller 3 output is effective, the invalidating signal of corresponding to back 30 clock cycle the time, exporting; When spreading code was 1, the signal of all clock cycle output was all effective.

Implementation process of the present invention roughly can be divided into following steps:

Step is 1.: through local code control information generator 1, produce symbol gate 5, the control information of XOR device 6 and the carry signal of full adder 7 according to the scrambler spreading code;

Step is 2.: the control information that symbol gate 5 produces according to local code control information generator 1, and the I component and the Q component of gating input chip data produce the data of 2 times of spreading rates;

Step is 3.: XOR device 6 is the control information that local code control information generator 1 produces, do bit expanded after, the data XOR that produces with symbol gate 5;

Step is 4.: full adder 7 is the result of bit XOR, carry out the sign bit expansion after, the carry-out bit that produces with the accumulation result and the local code control information generator of second d type flip flop, 9 feedbacks adds entirely;

Step is 5.: the zero setting control information of zero setting time schedule controller 3 outputs second d type flip flop 9;

Step is 6.: the output that feeds back to full adder 7, the second d type flip flops 9 after first d type flip flop 8 and second d type flip flop 9 carry out the result of full adder 7 to postpone for 2 times is controlled by the output of zero setting time schedule controller 3 simultaneously;

Step is 7.: the output of first d type flip flop 8 and 3d flip-flop 10, through the symbol sampler of symbol selector 4, export with character rate.

Application feature below in conjunction with in the user terminal in the TDS-CDMA system (UE) baseband chip illustrates technical scheme of the present invention.

Specifically, to the chip data that receive, to certain route of transmission of certain code channel, the descrambling and de-spreading of continuous SF chip can be expressed as following general formula:

s ~ n = Σ i = 1 SF r ( n - 1 ) · SF + i · c i * = Σ i = 1 SF r ( n - 1 ) · SF + i · ( spcode i · sccode i · ( j ) i ) * (1)

= Σ i = 1 SF r ( n - 1 ) · SF + i · spcode i · sccode i · ( j ) - i

Further, in general formula (1), Be n the symbol that obtains through descrambling and de-spreading; SF is a spreading code length, and descending SF is 16 or 1 in the TD-SCDMA system; r (n-1) SF+iBe the chip data that receive; Conjugation for scrambler and spreading code dot product result; Spcode iBe spreading code; Sccode i(j) -iConjugation for multiple scrambler.

Convenience for the integrated circuit hardware logic is realized can be written as I component and Q component respectively with general formula (1):

real ( s ~ n ) = real ( Σ i = 1 SF r ( n - 1 ) · SF + i · spcode i · sccode i · ( j ) - mod ( i , 2 ) · ( j ) - i + mod ( i , 2 ) ) (2)

= Σ i = 1 SF real ( r ( n - 1 ) · SF + i · ( j ) - mod ( i , 2 ) ) · spcode i · sccode i · ( j ) - i + mod ( i , 2 )

imag ( s ~ n ) = imag ( Σ i = 1 SF r ( n - 1 ) · SF + i · spcode i · sccode i · ( j ) mod ( i , 2 ) · ( j ) - i - mod ( i , 2 ) ) (3)

= Σ i = 1 SF imag ( r ( n - 1 ) · SF + i · ( j ) mod ( i , 2 ) ) · spcode i · sccode i · ( j ) - i - mod ( i , 2 )

For result's real part, (r (n-1) SF+i(j) -mod (i, 2)) reality is exactly to choose r (n-1) SF+iReal part or imaginary part, and (j) -i+mod (i, 2)Be always real number, spcode iSccode i(j) -i+mod (i, 2)I.e. this time of control add up add operation or reducing.Certainly, like this equally for imaginary part.

When certain chip data being carried out descrambling and de-spreading calculating, the chip data get into the device that is used for serial descrambling and de-spreading of mobile communication system in order successively.Again further, the processing time of each chip data is 2 clock cycle, i.e. first clock cycle, be used for descrambling and de-spreading adding up of I component as a result, and second clock cycle is used for descrambling and de-spreading adding up of Q component as a result.

Simultaneously, local code control information generator 1 is through (j) -mod (i, 2)Or (j) Mod (i, 2)Produce the real part of choosing the input data, the control information of imaginary part.The I component or the Q component of input chip selected through this control information in descrambling and de-spreading unit 2, carries out accumulation calculating.Specifically, local code control information generator 1 is taken advantage of spcode as a result by code-point iSccode i(j) -i ± mod (i, 2)Produce the input signal of XOR unit and the carry signal of full adder 7.For the real part result, (j) -i+mod (i, 2)=1 ,-1 ,-1,1 ... }; For the imaginary part result, (j) -i-mod (i, 2)=1 ,-1,1,1 ... }.In hardware, { 1 ,-1} is so that { 0,1} representes that the dot product of scrambler and spreading code can be through { 0, the XOR of 1} obtains.

Subsequently, when the carry input of the input signal of XOR unit and full adder 7 equaled 0, the data of 7 pairs of selections of full adder carry out I component or Q component adds up.When the carry input of the input signal of XOR unit and full adder 7 equaled 1,1 XOR of the data of then selecting and position expansion also added 1 and adds up.It is actual to be exactly that the data negate of selecting is added 1, has promptly carried out reducing, thereby accomplishes the descrambling and de-spreading operation of general formula (2), general formula (3).

Then, second d type flip flop 9 of descrambling and de-spreading unit 2, the result who adds up postponed a clock cycle after again feedback add up, making adds up carries out to I component result and Q component result at interval.And; When spreading code was 16, the 1st and 2 clock cycle in corresponding to 32 clock cycle of a symbol period, the signal of zero setting time schedule controller 3 outputs was effective; Make second d type flip flop 9 of descrambling and de-spreading unit 2 be output as 0, the descrambling and de-spreading of a symbol of beginning.Simultaneously, during the invalidating signal when back 30 clock cycle, exported, second d type flip flop 9 of descrambling and de-spreading unit 2 postpones accumulation result to feed back after a clock cycle, adds up normally.And when spreading code was 1, the signal of all clock cycle output was all effective, then imported data through directly output as a result of behind the full adder 7.

Meanwhile, the 3d flip-flop 10 of descrambling and de-spreading unit 2, the I component that descrambling and de-spreading is accomplished postpones a clock cycle, together outputs to symbol selector 4 after the Q component combination of accomplishing with the back.

Then; Symbol selector 4 carries out the output signal of descrambling and de-spreading unit 2 symbol sampler and obtains the descrambling and de-spreading result, and exports with character rate after suitably postponing; To mate the output timing of other branches, conveniently the high specific of each follow-up branch outcome merges.

At last, a descrambling and de-spreading ramifying that receives through receiver (RAKE) gets final product.

Can find out through above-mentioned description, only need a full adder behind employing the present invention, can accomplish the descrambling and de-spreading of a way word signal I, two components of Q.Its SECO is simple, saves logical resource, is applicable to the realization of application-specific integrated circuit (ASIC).Simultaneously, need not to multiply by-1 operation, can reduce the system Power Cutback and handle resource, on serial descrambling and de-spreading of mobile communication system, good application future is arranged.

Claims (5)

1. the device that is used for serial descrambling and de-spreading of mobile communication system is characterized in that comprising: local code control information generator, and it produces the control information of 2 times of spreading rates according to the scrambler spreading code; The descrambling and de-spreading unit, it carries out descrambling and de-spreading according to the sign indicating number control information to data; The zero setting time schedule controller, the zero clearing of its control descrambling and de-spreading unit; Symbol selector, it carries out symbol sampler to the descrambling and de-spreading result, exports the descrambling and de-spreading result of this branch; Local code control information generator, zero setting time schedule controller, symbol selector are connected into the descrambling and de-spreading unit respectively; Described descrambling and de-spreading unit; Comprise symbol gate, XOR device, full adder and at least 3 d type flip flops; The output of symbol gate is connected into the input of XOR device; The output of XOR device connects the input of full adder, and the input of full adder is connected with second d type flip flop, and the output of full adder connects the input of first d type flip flop; The output of first d type flip flop connects the input of second d type flip flop and 3d flip-flop, and the output of the output of 3d flip-flop and first d type flip flop is as the output of descrambling and de-spreading unit.
2. the method that is used for serial descrambling and de-spreading of mobile communication system; It is characterized in that may further comprise the steps: step 1.: through local code control information generator, produce symbol gate, the control information of XOR device and the carry signal of full adder (7) according to the scrambler spreading code;
Step is 2.: the control information that the symbol gate produces according to local code control information generator, and the correlated components of gating input chip data, and produce the data of 2 times of spreading rates;
Step is 3.: after bit expanded is done in the control information that the XOR device produces local code control information generator, and the data XOR that produces with symbol selector;
Step is 4.: full adder carries out the sign bit expansion with the result of bit XOR, and the carry-out bit that produces with the accumulation result and the local code control information generator of second d type flip flop feedback subsequently adds entirely;
Step is 5.: the zero setting time schedule controller is exported the zero setting control information of second d type flip flop;
Step is 6.: first d type flip flop and second d type flip flop feed back to full adder after the result of full adder carried out postponing for 2 times;
Step is 7.: the output of first d type flip flop and 3d flip-flop, through the symbol sampler of symbol selector, export with character rate.
3. the method that is used for serial descrambling and de-spreading of mobile communication system according to claim 2 is characterized in that: the 2. middle correlated components of said step is I component and Q component.
4. the method that is used for serial descrambling and de-spreading of mobile communication system according to claim 2; It is characterized in that: the zero setting time schedule controller operating state of said step in 5. comprises that downstream spread spectrum code is 16 and 1 totally two kinds of situation---when spreading code is 16; In corresponding to 32 clock cycle of a symbol period during the 1st and 2 clock cycle; The signal of zero setting time schedule controller output is effective, the invalidating signal of corresponding to back 30 clock cycle the time, exporting; When spreading code was 1, the signal of all clock cycle output was all effective.
5. the method that is used for serial descrambling and de-spreading of mobile communication system according to claim 2 is characterized in that: the output of second d type flip flop of said step in is 6. controlled by the output of zero setting time schedule controller.
CN2008101963839A 2008-09-04 2008-09-04 Device and method for serial descrambling and de-spreading of mobile communication system CN101667844B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0757449B1 (en) * 1995-07-31 2003-04-23 Harris Corporation Short burst direct acquisition direct sequence spread spectrum receiver
CN1474528A (en) * 2002-08-06 2004-02-11 深圳市中兴通讯股份有限公司 Channel evaluation method in wide band CDMA communication system
CN101064581A (en) * 2006-04-27 2007-10-31 凯明信息科技股份有限公司 Descrambling and despreading method and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0757449B1 (en) * 1995-07-31 2003-04-23 Harris Corporation Short burst direct acquisition direct sequence spread spectrum receiver
CN1474528A (en) * 2002-08-06 2004-02-11 深圳市中兴通讯股份有限公司 Channel evaluation method in wide band CDMA communication system
CN101064581A (en) * 2006-04-27 2007-10-31 凯明信息科技股份有限公司 Descrambling and despreading method and apparatus

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