CN101277127B - Method for receiving signal as well as receiver, method for combining signal as well as module - Google Patents

Method for receiving signal as well as receiver, method for combining signal as well as module Download PDF

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CN101277127B
CN101277127B CN2008100658788A CN200810065878A CN101277127B CN 101277127 B CN101277127 B CN 101277127B CN 2008100658788 A CN2008100658788 A CN 2008100658788A CN 200810065878 A CN200810065878 A CN 200810065878A CN 101277127 B CN101277127 B CN 101277127B
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footpath
signal
weights
bar
module
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CN101277127A (en
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赵宇翔
王菁
王小璐
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Huawei Technologies Co Ltd
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Abstract

An embodiment of the invention discloses a signal receiving method, a receiver, a signal combining method and a module thereof. The signal combing method comprises the following procedures: calculating the weight of each path; executing signal combination according to the weight of each path and the signal after DPDCH descrambling and dispreading; and outputting the combination result. The embodiment of the invention increases the performance of receiver in service with a plurality of paths and high speed through improving the combination method of the combination module.

Description

Signal acceptance method and receiver, signal combining method and module
Technical field
The present invention relates to communication technical field, specifically, relate to a kind of signal acceptance method and receiver, signal combining method and module.
Background technology
A plurality of users can share same frequency in the cdma system, and the utilance of frequency is largely increased.The RAKE receiver technology is the core technology of cdma system.Since in multipath signal, contain utilizable information, can be by merging the signal to noise ratio that multipath signal improves received signal.And RAKE receiver is done be exactly:, and they are combined by each the road signal in a plurality of correlation detector receiving multipath signals.
In the CDMA spread spectrum system, channel width is far longer than the flat fading bandwidth of channel.Being different from traditional modulation technique needs equalization algorithm to eliminate intersymbol interference between adjacent-symbol, when selecting the CDMA spreading code, just required good autocorrelation characteristic, like this, the time delay expansion that occurs in wireless channel just can be regarded as by the transmission once more of the number of delivering a letter.If the mutual time-delay of these multipath signals has surpassed the length of a chip, these multipath signals will be considered uncorrelated noise so, do not need equilibrium.The theoretical foundation of traditional RAKE receiver is exactly: when propagation delay surpassed a chip period, multipath signal was considered uncorrelated mutually.
Owing to decline fast and The noise in the channel, the phase place in each footpath of actual reception has very big variation with the phase place that transmitted originally, therefore need carry out the rotation of phase place according to the result of channel estimating before merging.Channel estimating in the cdma system is to realize according to the frequency pilot sign that carries in transmitting.Concrete mode is: whether carry continuous pilot during judgement transmits, when carrying continuous pilot in transmitting, adopt the Phase Prediction based on continuous pilot to realize channel estimating; When in transmitting, not carrying continuous pilot, adopt Phase Prediction to realize channel estimating based on the decision-feedback technology.
In the WCDMA system, the channel estimation module in the RAKE receiver adopts the channel estimation methods of decision-feedback technology.Channel estimation module utilizes the descrambling and de-spreading signal of DPCCH (Dedicated Physical Control Channel, Dedicated Physical Control Channel) and the time-multiplexed pilot information of priori, calculates the fading factor in each footpath.RAKE merges the merging that adds up after module multiplies each other DPDCH (Dedicated Physical Data Channel, Dedicated Physical Data Channel) the descrambling and de-spreading signal in each footpath and fading factor.
Existing RAKE receiver is based on the high specific combination principle, and received signal R obtains by the descrambling and de-spreading result and the channel estimation results in each footpath.Specifically can adopt following account form to obtain:
R=R 1* H 1 *+ R 2* H 2 *, wherein, R 1, R 2Be the descrambling and de-spreading signal in each footpath, H 1 *, H 2 *It is the conjugation of each footpath channel estimating fading factor.
Above formula is set up two preconditions: 1, do not consider two correlations between the footpath, think that promptly each directly is independently; 2, each footpath noise energy is identical.
And the inventor finds in realizing process of the present invention: under multipath and high-rate service, and formula R=R 1* H 1 *+ R 2* H 2 *Two preconditions setting up all can not satisfy as a rule, and under multipath and high-rate service, the performance of existing RAKE receiver can be poor like this.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of signal acceptance method and receiver, signal combining method is provided and merges module, improves the performance of receiver under multipath and high-rate service.
A kind of signal acceptance method that the embodiment of the invention provides comprises:
Receive baseband I/Q signal, carry out Multipath searching and mid-frequency noise and estimate, obtain the sky wire size in path position, footpath energy, mid-frequency noise and the true footpath of each bar;
According to the sky wire size in described path position, footpath energy and the true footpath of described each bar, carry out multipath calculating and distribute, obtain multi-path location; Described multipath comprises true footpath of each bar and the empty footpath of each bar, and perhaps described multipath comprises the true footpath of each bar;
According to baseband I/Q signal, described multi-path location, carry out descrambling and de-spreading, obtain the signal behind each footpath Dedicated Physical Data Channel DPDCH descrambling and de-spreading in signal behind the special used for physical control channel DPCCH descrambling and de-spreading of the true footpath of described each bar and the multipath;
Carry out channel estimating according to the signal behind the DPCCH descrambling and de-spreading of the true footpath of described each bar, obtain the fading factor in each bar footpath;
Fading factor according to described mid-frequency noise, multi-path location and each bar footpath carries out weights calculating, obtains the weights in each footpath in the described multipath;
Carry out the signal merging, the output amalgamation result according to the weights in described each footpath and the signal behind described each footpath DPDCH descrambling and de-spreading.
A kind of receiver comprises:
The Multipath searching module is used to receive baseband I/Q signal, carries out Multipath searching, obtains the sky wire size in path position, footpath energy and the true footpath of each bar;
The Noise Estimation module is used to receive baseband I/Q signal, carries out mid-frequency noise and estimates, obtains mid-frequency noise;
Real directly calculating and distribution module is used for the sky wire size according to described path position, footpath energy and the true footpath of each bar, carries out multipath calculating and distributes, and obtains multi-path location;
Described multipath comprises true footpath of each bar and the empty footpath of each bar, and perhaps, described multipath comprises the true footpath of each bar;
The descrambling and de-spreading module, be used for carrying out descrambling and de-spreading, obtain the signal behind each footpath Dedicated Physical Data Channel DPDCH descrambling and de-spreading in signal behind the special used for physical control channel DPCCH descrambling and de-spreading of the true footpath of described each bar and the multipath according to baseband I/Q signal and described multi-path location;
Channel estimation module is used for carrying out channel estimating according to the signal behind described each bar footpath DPCCH descrambling and de-spreading, obtains the fading factor in each bar footpath;
The weights computing module is used for carrying out weights calculating according to the fading factor in described mid-frequency noise, multi-path location and each bar footpath, obtains the weights in each bar footpath in the described multipath;
The merging module is used for carrying out the signal merging, the output amalgamation result according to the weights in each footpath and the signal behind each footpath DPDCH descrambling and de-spreading.
A kind of signal combining method comprises:
Fading factor according to mid-frequency noise, multi-path location and each bar footpath carries out weights calculating, obtains each footpath weights of multipath, and described multipath comprises the true footpath of each bar and each bar void footpath, and perhaps described multipath comprises the true footpath of each bar;
Carry out the signal merging, the output amalgamation result according to the weights in each footpath and the signal behind described each footpath Dedicated Physical Data Channel DPDCH descrambling and de-spreading.
A kind of signal merges module, comprising:
The weights computing module is used for carrying out weights calculating according to the fading factor in mid-frequency noise, multi-path location and each bar footpath, obtains each footpath weights of multipath, and described multipath comprises the true footpath of each bar and each bar void footpath, and perhaps described multipath comprises the true footpath of each bar;
Merge module, be used for carrying out the signal merging, the output amalgamation result according to the weights in each footpath and the signal behind described each footpath Dedicated Physical Data Channel DPDCH descrambling and de-spreading.
The embodiment of the invention has improved the performance of receiver under multipath and high-rate service by improving the merging method that merges module.
Description of drawings
Fig. 1 is the method flow diagram of a kind of signal acceptance method embodiment one of the present invention;
Fig. 2 is the method flow diagram of a kind of signal acceptance method embodiment two of the present invention;
Fig. 3 is the structural representation of a kind of receiver embodiment of the present invention;
Fig. 4 is the schematic flow sheet of a kind of signal combining method of the present invention.
Embodiment
Describe the technical scheme of the embodiment of the invention in detail below in conjunction with accompanying drawing.
Figure 1 shows that the embodiment one of a kind of signal acceptance method that the embodiment of the invention provides, comprising:
Step 101, reception baseband I/Q signal carry out Multipath searching and mid-frequency noise and estimate, obtain sky wire size, path position, the footpath energy in the true footpath of L bar, reach mid-frequency noise.
Step 102, the sky wire size according to the true footpath of this L bar, path position, footpath energy carry out multipath calculating and distribute, and obtain the path position in the true footpath of L bar, and multi-path location.
Step 103, according to the path position in the true footpath of baseband I/Q signal and L bar, carry out descrambling and de-spreading, obtain signal behind the DPCCH descrambling and de-spreading of the true footpath of L bar and the signal behind the DPDCH descrambling and de-spreading of the true footpath of L bar.
Step 104, carry out channel estimating, obtain the fading factor in each bar footpath according to the signal behind the DPCCH descrambling and de-spreading of the true footpath of described L bar.
Step 105, carry out weights according to the fading factor in described mid-frequency noise, multi-path location and each bar footpath and calculate, obtain the weights in the true footpath of L bar.In reality realizes, also can store the weights in the true footpath of L bar that obtains.
Specifically can between each footpath, certain correlation be arranged, and under each footpath noise energy situation inequality, carry out weights in the following ways and calculate:
Figure GSB00000421360800051
Wherein, ω is weights, and χ is the correlation in each footpath, can be according to multi-path location by inquiry auto-correlation function table and calculating,
Figure GSB00000421360800052
Be the mid-frequency noise in each footpath, h 1, h 2Be the fading factor that channel estimating obtains, by obtaining after the similar root raised cosine filtering.
Wherein, can judge with each footpath noise whether each footpath noise energy is identical by the signal energy in each footpath.The signal energy in each footpath can be calculated with Distribution Calculation by multipath and obtain, and each footpath noise can obtain by carrying out the footpath Noise Estimation according to the signal behind the DPCCH descrambling and de-spreading of true footpath.
Step 106, carry out signal according to the weights in each footpath and the signal behind the DPDCH descrambling and de-spreading and merge the output amalgamation result.
Concrete merging mode can adopt following method: R=R 1* ω 1+ R 2* ω 2, wherein, ω 1, ω 2Be respectively the weights in each footpath, R 1, R 2It is the signal behind the DPDCH descrambling and de-spreading.
This signal acceptance method embodiment can also comprise: receive index signal, switch between signal acceptance method that the embodiment of the invention provides and existing RAKE method of reseptance according to the indication of index signal.When this index signal indication switches to existing RAKE method of reseptance, receive baseband I/Q signal, carry out Multipath searching, obtain sky wire size, path position, the footpath energy in the true footpath of L bar; Sky wire size, path position, footpath energy according to the true footpath of this L bar carry out multipath calculating and distribute, and obtain the true path position of L bar; According to baseband I/Q signal and the true path position of L bar, carry out descrambling and de-spreading, obtain signal behind the DPCCH descrambling and de-spreading of L bar footpath and the signal behind the DPDCH descrambling and de-spreading of L bar footpath; Carry out channel estimating according to the signal behind the DPCCH descrambling and de-spreading of described L bar footpath, obtain the fading factor in every footpath; Fading factor and the signal behind the DPDCH descrambling and de-spreading according to each footpath carry out the signal merging, the output amalgamation result.
Figure 2 shows that the embodiment two of a kind of signal acceptance method that the embodiment of the invention provides, comprising:
Step 201, reception baseband I/Q signal carry out Multipath searching and mid-frequency noise and estimate, obtain sky wire size, path position, the footpath energy in the true footpath of L bar, reach mid-frequency noise.
Step 202, the sky wire size according to the true footpath of this L bar, path position, footpath energy carry out multipath calculating and distribute, and obtain the path position in the true footpath of L bar and the path position in M bar void footpath, and multi-path location.
Step 203, according to the path position in the true footpath of baseband I/Q signal, L bar and the path position in the empty footpath of M bar, carry out descrambling and de-spreading, obtain signal behind the DPCCH descrambling and de-spreading of the true footpath of L bar and the signal behind the DPDCH descrambling and de-spreading, and the signal behind the DPDCH descrambling and de-spreading of the empty footpath of M bar.
Step 204, carry out channel estimating, obtain the fading factor in each bar footpath according to the signal behind the DPCCH descrambling and de-spreading of the true footpath of described L bar.
Step 205, carry out weights according to the fading factor in described mid-frequency noise, multi-path location and each bar footpath and calculate, obtain the empty weights directly of the true footpath+M bar of L bar.In reality realizes, also can store the weights in the empty footpath of the true footpath+M bar of the L bar that obtains.
Specifically can between each footpath, certain correlation be arranged, and under each footpath noise energy situation inequality, carry out weights in the following ways and calculate:
Figure GSB00000421360800061
Wherein, ω is weights, and χ is the correlation in each footpath, can be according to multi-path location by inquiry auto-correlation function table and calculating,
Figure GSB00000421360800062
Be the mid-frequency noise in each footpath, h 1, h 2Be the fading factor that channel estimating obtains, by obtaining after the similar root raised cosine filtering.
Wherein, can judge with each footpath noise whether each footpath noise energy is identical by the signal energy in each footpath.The signal energy in each footpath can be calculated with Distribution Calculation by multipath and obtain, and each footpath noise can obtain by carrying out the footpath Noise Estimation according to the signal behind the DPCCH descrambling and de-spreading of true footpath.
Step 206, carry out signal according to the weights in each footpath and the signal behind the DPDCH descrambling and de-spreading and merge the output amalgamation result.
Concrete merging mode can adopt following method: R=R 1* ω 1+ R 2* ω 2, wherein, ω 1, ω 2Be respectively the weights in each footpath, R 1, R 2It is the signal behind the DPDCH descrambling and de-spreading.
This signal acceptance method embodiment can also comprise: receive index signal, switch between signal acceptance method that the embodiment of the invention provides and existing RAKE method of reseptance according to the indication of index signal.When this index signal indication switches to existing RAKE method of reseptance, receive baseband I/Q signal, carry out Multipath searching, obtain sky wire size, path position, the footpath energy in the true footpath of L bar; Sky wire size, path position, footpath energy according to the true footpath of this L bar carry out multipath calculating and distribute, and obtain the true path position of L bar; According to baseband I/Q signal and the true path position of L bar, carry out descrambling and de-spreading, obtain signal behind the DPCCH descrambling and de-spreading of L bar footpath and the signal behind the DPDCH descrambling and de-spreading of L bar footpath; Carry out channel estimating according to the signal behind the DPCCH descrambling and de-spreading of described L bar footpath, obtain the fading factor in every footpath; Fading factor and the signal behind the DPDCH descrambling and de-spreading according to each footpath carry out the signal merging, the output amalgamation result.
Present embodiment carries out weights calculating by introducing empty footpath, has further improved the performance of receiver under multipath and high-rate service scene.
Figure 3 shows that the embodiment of a kind of receiver that the embodiment of the invention provides, comprising: Multipath searching module 301, Noise Estimation module 302, multipath calculate with distribution module 303, descrambling and de-spreading module 304, channel estimation module 305, weights computing module 306 and merge module 307.
Multipath searching module 301 is used to receive baseband I/Q signal, carries out Multipath searching, obtains sky wire size, path position, the footpath energy in each bar footpath.
Noise Estimation module 302 is used to receive baseband I/Q signal, carries out mid-frequency noise and estimates, obtains mid-frequency noise.
Multipath calculates and distribution module 303, is used for sky wire size, path position, footpath energy according to each bar footpath, carries out multipath calculating and distributes, and obtains the path position in each bar footpath, and multi-path location.
Descrambling and de-spreading module 304 is used for carrying out descrambling and de-spreading according to the path position in baseband I/Q signal and each bar footpath, obtains signal behind each bar footpath DPCCH descrambling and de-spreading and the signal behind the DPDCH descrambling and de-spreading.
Channel estimation module 305 is used for carrying out channel estimating according to the signal behind described each bar footpath DPCCH descrambling and de-spreading, obtains the fading factor in each bar footpath.
Weights computing module 306 is used for carrying out weights calculating according to the fading factor in described mid-frequency noise, multi-path location and each bar footpath, obtains the weights in each bar footpath.Described weights calculating sub module can be the first weights calculating sub module, and being used for has certain correlation between each footpath, and under each footpath noise energy situation inequality, adopts formula
Figure GSB00000421360800081
Calculate the weights in each footpath, wherein, ω is weights, and χ is the correlation in each footpath, can be according to multi-path location by inquiry auto-correlation function table and calculate,
Figure GSB00000421360800082
Be the mid-frequency noise in each footpath, h 1, h 2Be the fading factor that channel estimating obtains, by obtaining after the similar root raised cosine filtering.Wherein, can judge with each footpath noise whether each footpath noise energy is identical by the signal energy in each footpath.The signal energy in each footpath can be calculated with Distribution Calculation by multipath and obtain, and each footpath noise can obtain by carrying out the footpath Noise Estimation according to the signal behind the DPCCH descrambling and de-spreading of true footpath.
Merge module 307, be used for carrying out the signal merging, the output amalgamation result according to the weights and the signal behind the DPDCH descrambling and de-spreading in each footpath.Described merging module can be used for according to formula R=R for merging submodule 1* ω 1+ R 2* ω 2Combined signal, wherein, ω 1, ω 2Be respectively the weights in each footpath, R 1, R 2It is the signal behind the DPDCH descrambling and de-spreading.
Wherein, Multipath searching module 301, Noise Estimation module 302, descrambling and de-spreading module 304, channel estimation module 305 and merging module 307 can be realized by application-specific integrated circuit (ASIC); Multipath calculates with distribution module 303 and weights computing module 306 and can be realized by DSP (Digital Signal Processor, digital signal processor), also can be realized by DSP core (dsp chip).
Wherein, multipath calculates with distribution module 303 and can comprise calculating of real footpath and distribution module; This real directly calculating and distribution module is used for sky wire size, path position, footpath energy according to the true footpath of each bar, carries out multipath calculating and distributes, and obtains the path position in the true footpath of L bar, and multi-path location;
Correspondingly, descrambling and de-spreading module 304 can be the first descrambling and de-spreading module; This first descrambling and de-spreading module is used for carrying out descrambling and de-spreading according to the path position in the true footpath of baseband I/Q signal and L bar, obtains signal behind the DPCCH descrambling and de-spreading of the true footpath of L bar and the signal behind the DPDCH descrambling and de-spreading.
Multipath calculates with distribution module 303 can also comprise calculating of empty footpath and distribution module; This void is directly calculated and distribution module, is used for sky wire size, path position, footpath energy according to the true footpath of this each bar, carries out multipath calculating and distributes, and obtains the path position in the empty footpath of M bar, and multi-path location;
Correspondingly, descrambling and de-spreading module 304 can be the second descrambling and de-spreading module; This second descrambling and de-spreading module, be used for carrying out descrambling and de-spreading according to the path position in baseband I/Q signal, the true footpath of L bar and the path position in the empty footpath of M bar, obtain the signal behind the signals DP DCH descrambling and de-spreading behind the DPCCH descrambling and de-spreading of the true footpath of each bar, and the signal behind the DPDCH descrambling and de-spreading of the empty footpath of each bar.
This receiver can also comprise memory module, is used to store each bar weights directly that weights computing module 306 calculates; This receiver can also comprise acquisition module, is used for obtaining the weights of this memory module, sends to merge module 307.
This receiver can also comprise indicating module, is used to receive index signal, switches between receiver that the embodiment of the invention provides and existing RAKE receiver according to the indication of index signal.When this index signal indication switched to existing RAKE receiver, Multipath searching module 301 received baseband I/Q signal, carries out Multipath searching, obtained sky wire size, path position, the footpath energy in the true footpath of L bar; Multipath calculating and sky wire size, path position, the footpath energy of distribution module 303 according to the true footpath of this L bar are carried out multipath calculating and are distributed, and obtain the true path position of L bar; Descrambling and de-spreading module 304 is carried out descrambling and de-spreading according to baseband I/Q signal and the true path position of L bar, obtains signal behind the DPCCH descrambling and de-spreading of L bar footpath and the signal behind the DPDCH descrambling and de-spreading of L bar footpath; The signal of channel estimating submodule after according to described L bar footpath DPCCH descrambling and de-spreading carries out channel estimating, obtains the fading factor in every footpath; Merge module 307 and merge, the output amalgamation result according to the fading factor in each footpath and the signal behind the DPDCH descrambling and de-spreading.
The embodiment of the invention also provides a kind of signal combining method, comprising:
The weights in step 401, each footpath of calculating;
The concrete mode of calculating the weights in each footpath can adopt: carry out weights according to the fading factor in the true footpath of mid-frequency noise, multi-path location and each bar and calculate, obtain the weights in the true footpath of L bar, perhaps and the weights in the empty footpath of M bar.In reality realizes, also can store the weights that obtain.
Specifically can between each footpath, certain correlation be arranged, and under each footpath noise energy situation inequality, carry out weights in the following ways and calculate:
Figure GSB00000421360800101
Wherein, ω is weights, and χ is the correlation in each footpath, can be according to multi-path location by inquiry auto-correlation function table and calculating,
Figure GSB00000421360800102
Be the mid-frequency noise in each footpath, h 1, h 2Be that the fading factor that obtains of channel estimating obtains after by similar root raised cosine filtering.Wherein, can judge with each footpath noise whether each footpath noise energy is identical by the signal energy in each footpath.The signal energy in each footpath can be calculated with Distribution Calculation by multipath and obtain, and each footpath noise can obtain by carrying out the footpath Noise Estimation according to the signal behind the DPCCH descrambling and de-spreading of true footpath.
Step 402, carry out signal according to the weights in each footpath and the signal behind the DPDCH descrambling and de-spreading and merge the output amalgamation result.
Concrete merging mode can adopt following method: R=R 1* ω 1+ R 2* ω 2, wherein, ω 1, ω 2Be respectively the weights in each footpath, R 1, R 2It is the signal behind the DPDCH descrambling and de-spreading.
This signal combining method can also comprise: receive index signal, switch between signal combining method that the embodiment of the invention provides and existing RAKE merging method according to the indication of index signal.When the indication of this index signal switches to the existing RAKE method of merginging, carry out signal according to the fading factor in each footpath and the signal behind the DPDCH descrambling and de-spreading and merge, export amalgamation result.
The embodiment of the invention also provides a kind of signal to merge module, comprises the weights computing module and merges module;
The weights computing module is used to calculate the weights in each footpath; Described weights computing module can be the weights calculating sub module, is used for fading factor according to the true footpath of mid-frequency noise, multi-path location and each bar and carries out weights and calculate, and obtains the weights in the true footpath of L bar, perhaps and the weights in the empty footpath of M bar.
Described weights calculating sub module can be the first weights calculating sub module, and being used for has certain correlation between each footpath, and under each footpath noise energy situation inequality, adopts formula
Figure GSB00000421360800103
Calculate the weights in each footpath, wherein, ω is weights, and χ is the correlation in each footpath, can be according to multi-path location by inquiry auto-correlation function table and calculate,
Figure GSB00000421360800104
Be the mid-frequency noise in each footpath, h 1, h 2Be the fading factor that channel estimating obtains, by obtaining after the similar root raised cosine filtering.Wherein, can judge with each footpath noise whether each footpath noise energy is identical by the signal energy in each footpath.The signal energy in each footpath can be calculated with Distribution Calculation by multipath and obtain, and each footpath noise can obtain by carrying out the footpath Noise Estimation according to the signal behind the DPCCH descrambling and de-spreading of true footpath.
Merge module, be used for carrying out the signal merging, the output amalgamation result according to the weights and the signal behind the DPDCH descrambling and de-spreading in each footpath.
Described merging module can be used for according to formula R=R for merging submodule 1* ω 1+ R 2* ω 2Combined signal, wherein, ω 1, ω 2Be respectively the weights in each footpath, R 1, R 2It is the signal behind the DPDCH descrambling and de-spreading.
This signal merges module can also comprise memory module, is used to store the weights that the weights computing module calculates; This signal merges module can also comprise acquisition module, is used for obtaining the weights of this memory module, sends to the merging module.
This signal merges module can also comprise indicating module, is used to receive index signal, merges between the module at merging module that the embodiment of the invention provides and existing RAKE according to the indication of index signal and switches.When the indication of this index signal switches to existing RAKE and merges module, merge module and merge, the output amalgamation result according to the fading factor in each footpath and the signal behind the DPDCH descrambling and de-spreading.
The RAKE that the embodiment of the invention has been improved in the existing RAKE receiver merges module, and merging module of the present invention, the performance of receiver under multipath and high-rate service are improved; And the embodiment of the invention has been introduced each footpath noise and empty footpath in receiver, and the performance of receiver further is provided.
If adopt DSP or DSP core to realize the embodiment of the invention, can realize realizing the embodiment of the invention with software mode, and provide the flexible switching between receiver of the present invention and existing RAKE receiver, can realize like this: under high-rate service, use the embodiment of the invention, under low rate traffic, use the RAKE receiver transmission signals.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (20)

1. a signal acceptance method is characterized in that, comprising:
Receive baseband I/Q signal, carry out Multipath searching and mid-frequency noise and estimate, obtain the sky wire size in path position, footpath energy, mid-frequency noise and the true footpath of each bar;
According to the sky wire size in described path position, footpath energy and the true footpath of described each bar, carry out multipath calculating and distribute, obtain multi-path location; Described multipath comprises true footpath of each bar and the empty footpath of each bar, and perhaps described multipath comprises the true footpath of each bar;
According to baseband I/Q signal, described multi-path location, carry out descrambling and de-spreading, obtain the signal behind each footpath Dedicated Physical Data Channel (DPDCH) descrambling and de-spreading in signal behind Dedicated Physical Control Channel (DPCCH) descrambling and de-spreading of the true footpath of described each bar and the multipath;
Carry out channel estimating according to the signal behind the DPCCH descrambling and de-spreading of the true footpath of described each bar, obtain the fading factor in each bar footpath;
Fading factor according to described mid-frequency noise, multi-path location and each bar footpath carries out weights calculating, obtains the weights in each footpath in the described multipath;
Carry out the signal merging, the output amalgamation result according to the weights in described each footpath and the signal behind described each footpath DPDCH descrambling and de-spreading.
2. method according to claim 1 is characterized in that, described fading factor according to described mid-frequency noise, multi-path location and each bar footpath carries out weights and calculates, and the weights that obtain each footpath in the described multipath comprise:
Between each footpath, certain correlation is arranged, and under each footpath noise energy situation inequality, adopt formula ω = σ 1 2 χ χ σ 2 2 - 1 · h 1 h 2 Calculate the weights in each footpath, wherein, ω is weights, and χ is the correlation in each footpath,
Figure FSB00000583942600012
Figure FSB00000583942600013
Be the mid-frequency noise in each footpath, h 1, h 2It is the fading factor that channel estimating obtains.
3. method according to claim 2 is characterized in that, described weights and the signal behind described each footpath DPDCH descrambling and de-spreading according to described each footpath carries out signal and merge, and the step of output amalgamation result comprises:
Adopt formula R=R 1* ω 1+ R 2* ω 2Carry out signal and merge, wherein, ω 1, ω 2Be respectively the weights in each footpath, R 1, R 2Be the signal behind described each footpath DPDCH descrambling and de-spreading, R is described amalgamation result.
4. method according to claim 1 is characterized in that, also comprises: the weights in each footpath that storage computation obtains.
5. method according to claim 1 is characterized in that, receives index signal, switches between described signal acceptance method and other existing RAKE method of reseptance according to the indication of described index signal.
6. a receiver is characterized in that, comprising:
The Multipath searching module is used to receive baseband I/Q signal, carries out Multipath searching, obtains the sky wire size in path position, footpath energy and the true footpath of each bar;
The Noise Estimation module is used to receive baseband I/Q signal, carries out mid-frequency noise and estimates, obtains mid-frequency noise;
Real directly calculating and distribution module is used for the sky wire size according to described path position, footpath energy and the true footpath of each bar, carries out multipath calculating and distributes, and obtains multi-path location;
Described multipath comprises true footpath of each bar and the empty footpath of each bar, and perhaps, described multipath comprises the true footpath of each bar;
The descrambling and de-spreading module, be used for carrying out descrambling and de-spreading, obtain the signal behind each footpath Dedicated Physical Data Channel (DPDCH) descrambling and de-spreading in signal behind Dedicated Physical Control Channel (DPCCH) descrambling and de-spreading of the true footpath of described each bar and the multipath according to baseband I/Q signal and described multi-path location;
Channel estimation module is used for carrying out channel estimating according to the signal behind described each bar footpath DPCCH descrambling and de-spreading, obtains the fading factor in each bar footpath;
The weights computing module is used for carrying out weights calculating according to the fading factor in described mid-frequency noise, multi-path location and each bar footpath, obtains the weights in each bar footpath in the described multipath;
The merging module is used for carrying out the signal merging, the output amalgamation result according to the weights in each footpath and the signal behind each footpath DPDCH descrambling and de-spreading.
7. receiver according to claim 6 is characterized in that, described weights computing module is the first weights calculating sub module, and being used for has certain correlation between each footpath, and under each footpath noise energy situation inequality, adopts formula ω = σ 1 2 χ χ σ 2 2 - 1 · h 1 h 2 Calculate the weights in each footpath, wherein, ω is weights, and χ is the correlation in each footpath,
Figure FSB00000583942600023
Be the noise in each footpath, h 1, h 2It is the fading factor that channel estimating obtains.
8. receiver according to claim 7 is characterized in that, described merging module is used for according to formula R=R for merging submodule 1* ω 1+ R 2* ω 2Combined signal, wherein, R is an amalgamation result, ω 1, ω 2Be respectively the weights in each footpath, R 1, R 2It is the signal behind described each footpath DPDCH descrambling and de-spreading.
9. receiver according to claim 6 is characterized in that, also comprises:
Memory module is used to store each bar weights directly that the weights computing module calculates;
Acquisition module is used for obtaining the weights of described memory module, sends to the merging module.
10. receiver according to claim 6 is characterized in that, also comprises indicating module, is used to receive index signal, switches between described receiver and other existing RAKE receiver according to the indication of described index signal.
11. a signal combining method is characterized in that, comprising:
Fading factor according to mid-frequency noise, multi-path location and each bar footpath carries out weights calculating, obtains each footpath weights of multipath, and described multipath comprises the true footpath of each bar and each bar void footpath, and perhaps described multipath comprises the true footpath of each bar;
Carry out the signal merging, the output amalgamation result according to the weights in each footpath and the signal behind described each footpath Dedicated Physical Data Channel (DPDCH) descrambling and de-spreading.
12. method according to claim 11 is characterized in that, described fading factor according to mid-frequency noise, multi-path location and each bar footpath carries out weights and calculates, and each the footpath weights that obtains multipath comprise:
Between each footpath, certain correlation is arranged, and under each footpath noise energy situation inequality, adopt formula ω = σ 1 2 χ χ σ 2 2 - 1 · h 1 h 2 Calculate the weights in each footpath, wherein, ω is weights, and χ is the correlation in each footpath,
Figure FSB00000583942600032
Figure FSB00000583942600033
Be the noise in each footpath, h 1, h 2It is the fading factor that channel estimating obtains.
13. method according to claim 12 is characterized in that, the signal behind the weights in each footpath of described basis and described each footpath DPDCH descrambling and de-spreading carries out signal and merges, and the step of output amalgamation result comprises:
Adopt formula R=R 1* ω 1+ R 2* ω 2Carry out signal and merge, wherein, R is an amalgamation result, ω 1, ω 2Be respectively the weights in each footpath, R 1, R 2It is the signal behind described each footpath DPDCH descrambling and de-spreading.
14. method according to claim 11 is characterized in that, also comprises: the weights in each footpath that storage computation obtains.
15. method according to claim 11 is characterized in that, also comprises the reception index signal, switches between described signal combining method and other existing RAKE merging method according to the indication of described index signal.
16. a signal merges module, it is characterized in that, comprising:
The weights computing module is used for carrying out weights calculating according to the fading factor in mid-frequency noise, multi-path location and each bar footpath, obtains each footpath weights of multipath, and described multipath comprises the true footpath of each bar and each bar void footpath, and perhaps described multipath comprises the true footpath of each bar;
Merge module, be used for carrying out the signal merging, the output amalgamation result according to the weights in each footpath and the signal behind described each footpath Dedicated Physical Data Channel (DPDCH) descrambling and de-spreading.
17. signal according to claim 16 merges module, it is characterized in that described weights calculating sub module is the first weights calculating sub module, being used for has certain correlation between each footpath, and under each footpath noise energy situation inequality, adopts formula ω = σ 1 2 χ χ σ 2 2 - 1 · h 1 h 2 Calculate the weights in each footpath, wherein, ω is weights, and χ is the correlation in each footpath,
Figure FSB00000583942600042
Be the noise in each footpath, h 1, h 2It is the fading factor that channel estimating obtains.
18. signal according to claim 17 merges module, it is characterized in that, described merging module is used for according to formula R=R for merging submodule 1* ω 1+ R 2* ω 2Combined signal, wherein, R is an amalgamation result, ω 1, ω 2Be respectively the weights in each footpath, R 1, R 2It is the signal behind described each footpath DPDCH descrambling and de-spreading.
19. signal according to claim 16 merges module, it is characterized in that, also comprises:
Memory module is used to store the weights that the weights computing module calculates;
Acquisition module is used for obtaining the weights of described memory module, sends to the merging module.
20. signal according to claim 16 merges module, it is characterized in that, also comprises indicating module, is used to receive index signal, switches between other existing RAKE merging module in described signal merging module according to the indication of described index signal.
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