CN100574165C - A kind of signal multi-path demodulation method of broadband CDMA system - Google Patents
A kind of signal multi-path demodulation method of broadband CDMA system Download PDFInfo
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- CN100574165C CN100574165C CNB2004100046779A CN200410004677A CN100574165C CN 100574165 C CN100574165 C CN 100574165C CN B2004100046779 A CNB2004100046779 A CN B2004100046779A CN 200410004677 A CN200410004677 A CN 200410004677A CN 100574165 C CN100574165 C CN 100574165C
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Abstract
The invention discloses the signal multi-path demodulation method of a kind of Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, the demodulating equipment that use comprises demodulation parameter configuration module and multi-path demodulation module carries out multi-path demodulation, this method may further comprise the steps: a. demodulation parameter configuration module is divided into the more than one time period with the fixing clock cycle, is distributed to any footpath of any channel all clock cycle of each time period; And want the channel number of demodulation and footpath parameter to send to the multi-path demodulation module current slot; B. the multi-path demodulation module reads the signal data to be demodulated in the corresponding footpath of this parameter respective channels according to the parameter that receives from the demodulation parameter configuration module, in the time period that this directly is assigned with this signal data is carried out demodulation; C. the multi-path demodulation module stores is finished demodulated data.Use the present invention can effectively improve the utilance of demodulation resource, make it reach 100%.
Description
Technical field
The present invention relates to the signal processing method in a kind of Wideband Code Division Multiple Access (WCDMA) (WCDMA), be specifically related to the signal multi-path demodulation method of a kind of WCDMA system.
Background technology
Electric wave can run into various objects in communication process, when reflection, scattering, diffraction arrival reception antenna, become the composite wave that arrives by each path, and the amplitude and the phase place of each propagation path component are different, and this communication mode is exactly a multipath transmisstion.Since different multipaths in the space the path length difference of process, the time-delay on receiving terminal will generation time, actual reception to signal be the stack of the many signals of same signal after different delay.So receiving these signals just needs temporal diversity reception.
Now, spread spectrum communication system makes temporal diversity accept to become possibility.Adopt spread spectrum, the transmitting chain before antenna is introduced spreading code, and this process is called spread processing, can be with in diffusion of information to the wideer frequency band.Remove corresponding spreading code before data are recovered in receiving link and be called demodulation, demodulation is to rebuild information on the original bandwidth of signal.Obviously, need know spreading code in advance at the two ends of message transmission path.The signal time difference that arrives receiving terminal has only several microseconds usually, just can find out several signals stronger in the multichannel time delayed signal according to the spreading code autocorrelation performance, Here it is Multipath searching.Then, realize demodulation, and the demodulation result in each footpath is merged, recover the original information that passes each footpath according to the result of Multipath searching.In actual conditions, because channel circumstance is complicated and changeable, between the different user of synchronization, and between same user's the different moment, the number of multipath all can be different.Such as, when the sighting distance situation, the number of multipath can be fewer; More for a long time, the number of multipath can be many at barrier.
In the WCDMA system, generally speaking, for unique user, the number that can search effective multipath is 2 to 16 footpaths, and traditional way is to distribute fixing multipath number to carry out demodulation to each user.Referring to Fig. 1, Fig. 1 is many structure and principle schematic through demodulating equipment of prior art.Wherein, demodulation parameter configuration module 100 is generally realized by digital signal processor (DSP), its concrete work is that configuration needs the respective channel of demodulation and the parameter of multipath, with the current channel number of demodulation and the data reading controller 112 that the footpath parameter sends to multi-path demodulation module 110 of needing.110 of multi-path demodulation modules can be realized by field programmable gate array (FPGA) or application-specific integrated circuit (ASIC) (ASIC).
As shown in Figure 1, these many demodulating processes through demodulating equipment may further comprise the steps:
Behind step 2, data reading controller 112 receive that demodulation parameter configuration module 100 sends the current channel number and footpath parameter that needs demodulation,, again data are sent to multiple quadrupler 113 according to this parameter reading of data from data storage 111.
Step 3, when data entered multiple quadrupler 113, I data and Q data were divided into two-way separately, and wherein one road I data and one road Q data are taken advantage of again with the local code word of DPDCH respectively, enter adder after two paths of data is taken advantage of again and will take advantage of results added again, latch in d type flip flop 114;
Another road I data and another road Q data are taken advantage of again with the local code word of DPCCH respectively, enter adder after two paths of data is taken advantage of again and will take advantage of results added again, latch in d type flip flop 115.
The local code word of being taken advantage of in this operation is the conjugate complex number of the spreading code that adds when transmitting.At this moment, added spreading code when being latched base band antenna data in d type flip flop 114 and d type flip flop 115 and just being removed emission, and be divided into DPDCH data and DPCCH data.
Step 4, DPDCH data and DPCCH data all enter adding up device 116 and add up separately, to improve the energy of signal.
Step 5, DPDCH data after adding up and DPCCH data serial enter d type flip flop 117 and latch.
Step 6, d type flip flop 117 sends to dissimilar two paths of data serials in the respective data storage device, and promptly the DPDCH storage is in data in special physical data channel memory 118; The DPCCH storage is in Dedicated Physical Control Channel data storage 119.
When storage, the demodulation DPDCH data of finishing of per 8 clock cycle are stored in separately in the data address of data in special physical data channel memory 118; The demodulation DPCCH data of finishing of per 8 clock cycle are stored in separately in the data address of Dedicated Physical Control Channel data storage 119.
In above-mentioned data demodulation process, the multipath of each channel is according to the sequential serial process.At present, each demodulating data amount of wanting that receives is 4 chips, because of a clock cycle can be handled the data of 1/16 chip, so DSP distributes 64 clock cycle to be used for data demodulates at every turn.The demodulation process sequential chart as shown in Figure 2, Fig. 2 is a prior art demodulation process sequential chart.Demodulation parameter configuration module 100, normally DSP distributes to 64 continuous clock cycle in a plurality of footpaths of a channel, because of answering of each footpath taken advantage of and the time period that takies of operation of adding up is 8 clock cycle, so being fixed, per 64 clock cycle distribute to a channel, per 8 clock cycle of 64 clock cycle footpath in the multipath of distributing to this channel that is fixed.
Concrete data demodulates sequential is: in first 8 clock cycle the data in No. 0 footpath of certain channel are handled, and its data are added local code word of DPDCH and the local code word of DPCCH respectively, in order to the data demodulation, during later on each deal with data, demodulation process is identical.Second 8 clock cycle the data in No. 1 footpath of this channel are handled, so continued, up to the data in No. 7 footpaths of this channel being handled the 8th 8 clock cycle.Then, first of next 64 clock cycle 8 clock cycle handle the follow-up not demodulating data in No. 0 footpath of this channel again, go round and begin again like this, data processing up to this channel finishes, 64 clock cycle that this channel occupies just are released, for the multipath use of one other channel.
Owing to all fix to each channel allocation 8 time resource directly during the each deal with data of the demodulating equipment of prior art and carry out demodulation, so if which channel is used for the multipath of demodulation more than 8 footpaths, one 8 time resource directly of so just need having reallocated carries out demodulation, and this just is equivalent to and has distributed 64 clock cycle.But in fact, the multipath number just in time reach 8 the footpath multiples situation considerably less, the effective diameter number of each channel generally be 2 to 8 the footpath, on average 6 the footpath about.Like this, for each channel, if multipath less than 8 footpaths, also can only go demodulation with the demodulation resource in 8 footpaths; Perhaps the multipath number less than 16 footpaths, also can only carry out demodulation with the resource in 16 footpaths greater than 8 footpaths.Like this, the integral multiple of 64 clock cycle distributing to a certain channel of being fixed must have the time to a certain degree idle in the time period.Therefore, this demodulation method is always not high for the utilance of demodulation resource, sometimes even very low, has caused the serious waste of resource.
Summary of the invention
In view of this, main purpose of the present invention is to provide the signal multi-path demodulation method of a kind of WCDMA system, and demodulation resource is utilized effectively, and improves system works efficient.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of signal multi-path demodulation method of broadband CDMA system uses the demodulating equipment that comprises demodulation parameter configuration module and multi-path demodulation module to carry out multi-path demodulation, and this method may further comprise the steps:
A. the demodulation parameter configuration module is divided into time period greater than one with the fixing clock cycle, is distributed to any footpath of any channel all clock cycle of each time period; And want the channel number of demodulation and footpath parameter to send to the multi-path demodulation module current slot;
B. the multi-path demodulation module reads the signal data to be demodulated in the corresponding footpath of this parameter respective channels according to the parameter that receives from the demodulation parameter configuration module, in the time period that this directly is assigned with this signal data is carried out demodulation;
C. the multi-path demodulation module stores is finished demodulated data.
Among the step c, when demodulated data is finished in each storage, can also in depositing the identical address of finishing demodulating data in, deposit the channel number of corresponding demodulating data and footpath number in.
When carrying out step a, per 64 clock cycle can be divided into 8 parts, 8 clock cycle of every part are disposed any footpath to any channel.
As seen, the signal multi-path demodulation method of WCDMA provided by the present invention system is distributed to the fixing clock cycle in any footpath of any channel and is carried out time-division processing, has improved the utilance of demodulation resource greatly.
Description of drawings
Fig. 1 prior art many structure and principle schematic through demodulating equipment;
Fig. 2 is a prior art demodulation process sequential chart;
Fig. 3 is the many structure and the principle schematic through demodulating equipment of a preferred embodiment of the present invention;
Fig. 4 is a kind of demodulation process sequential chart embodiment illustrated in fig. 3.
Embodiment
The present invention is further described in more detail below in conjunction with accompanying drawing and two specific embodiments.
Sort signal multi-path demodulation method of the present invention is distributed to the fixing clock cycle in any footpath of any channel and is carried out time-division processing.
Referring to Fig. 3, Fig. 3 is demodulation of the present invention many structure and principle schematic through demodulating equipment.In the present embodiment, demodulation parameter configuration module 300 is also realized by digital signal processor (DSP), its concrete work is respective channel and the multipath parameter that configuration needs demodulation, with the current channel number of demodulation and the data reading controller 312 that the footpath parameter sends to multi-path demodulation module 310 of needing.310 of multi-path demodulation modules can be realized by field programmable gate array (FPGA) or application-specific integrated circuit (ASIC) (ASIC), in the multi-path demodulation module 310 of present embodiment, data reading controller 312 has increased data wire and has been connected respectively to data in special physical data channel memory 317 and Dedicated Physical Control Channel data storage 318.
In the present embodiment, at first 300 pairs of data of demodulation parameter configuration module and resource are configured, it is divided into 8 parts with the available resources of 64 clock cycle, 8 every part clock cycle, and these 8 parts of resources are numbered respectively, 8 clock cycle of every part dispose to any footpath of any channel and carry out data processing.During work, DSP is the number of channel and its resource needed of footpath number decision of demodulation as required, and according to the utilization of resources situation resource requirement is configured.
Can come data and resource are configured according to the concrete condition of channel in actual applications.For example: DSP gives 8 channels, 1 footpath of each channel with 8 parts of resource distributions.Corresponding channel number is 5,4,3,2,6,7,1,0, and corresponding footpath is numbered 0,2,3,3,7,3,9,0.Then, DSP to the distribution condition of resource referring to table one:
Table one
As shown in Table 1, at this moment, No. 0 resource, just first 8 clock cycle are assigned to No. 0 footpath of No. 5 channels; No. 1 resource, just second 8 clock cycle are assigned to No. 2 footpaths of No. 4 channels; No. 2 resources, just the 3rd 8 clock cycle are assigned to No. 3 footpaths of No. 3 channels; No. 3 resources, just the 4th 8 clock cycle are assigned to No. 3 footpaths of No. 2 channels; No. 4 resources, just the 5th 8 clock cycle are assigned to No. 7 footpaths of No. 6 channels; No. 5 resources, just the 6th 8 clock cycle are assigned to No. 3 footpaths of No. 7 channels; No. 6 resources, just the 7th 8 clock cycle are assigned to No. 9 footpaths of No. 1 channel; No. 7 resources, just the 8th 8 clock cycle are assigned to No. 0 footpath of No. 0 channel.
DSP also can be as shown in Table 2 to the distribution of resource:
Table two
As shown in Table 2, DSP also can give 4 channels with 8 parts of resource distributions, and the multipath number of each channel is respectively 1,2,2,3.Corresponding channel number is 2,3,5,7; Corresponding footpath numbering is respectively 1,3,8,1,9,4,6,7.
At this moment, No. 0 resource, just first 8 clock cycle are assigned to No. 1 footpath of No. 2 channels; No. 1 and No. 2 resources, just second and the 3rd 8 clock cycle are distributed to No. 3 footpaths and No. 8 footpaths of No. 3 channels respectively; No. 3 and No. 4 resources, just the 4th and the 5th 8 clock cycle are distributed to No. 1 footpath and No. 9 footpaths of No. 5 channels respectively; No. 5, No. 6 and No. 7 resources, just the 6th, the 7th and the 8th 8 clock cycle are distributed to No. 4 footpaths of No. 7 channels, No. 6 footpaths and No. 7 footpaths respectively.
After resource distribution was good, demodulation parameter configuration module 300 was with the current channel number of demodulation and the data reading controller 312 that the footpath parameter sends to multi-path demodulation module 310 of needing.As shown in Figure 3, these many demodulating processes through demodulating equipment may further comprise the steps:
Behind step 2, data reading controller 312 receive that demodulation parameter configuration module 300 sends the current channel number and footpath parameter that needs demodulation,, again data are sent to multiple quadrupler 313 according to this parameter reading of data from data storage 311.
Step 3, when data entered multiple quadrupler 313, I data and Q data were divided into two-way separately, and wherein one road I data and one road Q data are taken advantage of again with the local code word of DPDCH respectively, enter adder after two paths of data is taken advantage of again and will take advantage of results added again, latch in d type flip flop 314;
Another road I data and another road Q data are taken advantage of again with the local code word of DPCCH respectively, enter adder after two paths of data is taken advantage of again and will take advantage of results added again, latch in d type flip flop 315.
The local code word of being taken advantage of in this operation is the conjugate complex number of the spreading code that adds when transmitting.At this moment, added spreading code when being latched base band antenna data in d type flip flop 314 and d type flip flop 315 and just being removed emission, and be divided into DPDCH data and DPCCH data.
Step 4, DPDCH data and DPCCH data all enter adding up device 316 and add up separately, to improve the energy of signal.
Step 5, DPDCH data after adding up and DPCCH data serial enter d type flip flop 317 and latch.
Step 6, d type flip flop 317 sends to dissimilar two paths of data serials in the respective data storage device, and promptly the DPDCH storage is in data in special physical data channel memory 318; The DPCCH storage is in Dedicated Physical Control Channel data storage 319.
Step 7, data reading controller 312 is by data line, with just finish the channel number of data of data demodulates and footpath number respectively the data after demodulation be saved in data in special physical data channel memory 318 and the Dedicated Physical Control Channel data storage 319.
When storage, the demodulation DPDCH data of finishing of per 8 clock cycle are stored in separately in the data address of data in special physical data channel memory 407, the channel numbers of finishing demodulation DPDCH data correspondence of this 8 clock cycle and footpath number also are stored in this address by data line again; The demodulation DPCCH data of finishing of per 8 clock cycle are stored in separately in the data address of Dedicated Physical Control Channel data storage 408, the channel numbers of finishing demodulation DPCCH data correspondence of this 8 clock cycle and footpath number also are stored in this address by data line again.This is for pairing channel number of corresponding demodulating data and footpath number are indicated, so that the back level of data is handled.
In above-mentioned data demodulation process, the multipath of each channel is also according to the sequential serial process, per 8 clock cycle in per 64 clock cycle are carried out demodulation process to data all relatively independently chronologically, handle sequential chart as shown in Figure 4, Fig. 4 is a kind of demodulation process sequential chart embodiment illustrated in fig. 3.
Give 8 channels at DSP with 8 parts of resource distributions, under the situation in each 1 footpath of channel, corresponding channel number is 5,4,3,2,6,7,1,0, and corresponding footpath number is 0,2,3,3,7,3,9,0.Its concrete data demodulates sequential is:
When data processing, the 0th footpath of channel 5 has just occupied 8 clock cycle in channel a A footpath, first 8 clock cycle in 64 clock cycle just, the data of handling in this 8 clock cycle are added into local code word of DPDCH and the local code word of DPCCH respectively, in order to the data demodulation, during later on each deal with data, demodulation process is identical; The 2nd footpath of channel 4 has just occupied 8 clock cycle in channel b B footpath, just second 8 clock cycle in 64 clock cycle; Ensuing the 3rd 8 clock cycle are occupied by the 3rd footpath of channel 3; Ensuing again the 4th 8 clock cycle are occupied by the 3rd footpath of channel 2.Carry out successively, last 8 clock cycle of 64 clock cycle are occupied by the 0th footpath of channel 0.From next 64 clock cycle, the 0th footpath of channel 5 has occupied 8 clock cycle in channel a A footpath again---just first 8 clock cycle of next 64 clock cycle---in order to handle follow-up not demodulating data, this process is gone round and begun again, certain data directly up to certain channel are finished demodulation process, these 8 clock cycle that directly occupy of this channel just are released, and use for the footpath of one other channel.
Above-mentioned two embodiment are divided into 8 parts with 64 clock cycle, are disposed any footpath to any channel 8 clock cycle of every part again.But, in concrete the application,, distributed to any footpath of any channel each time period and carry out time-division processing so long as the fixing clock cycle is divided into the more than one time period, all be feasible.
By above-described embodiment as can be seen, the signal multi-path demodulation method of WCDMA provided by the present invention system, make a demodulating equipment from can only handle single channel fixedly multipath can handle any multipath of any channel respectively to same demodulating equipment, make the demodulation resource utilance reach 100%.The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1, a kind of signal multi-path demodulation method of broadband CDMA system uses the demodulating equipment that comprises demodulation parameter configuration module and multi-path demodulation module to carry out multi-path demodulation, it is characterized in that this method may further comprise the steps:
A. the demodulation parameter configuration module is divided into time period greater than one with the fixing clock cycle, is distributed to any footpath of any channel all clock cycle of each time period; And want the channel number of demodulation and footpath parameter to send to the multi-path demodulation module current slot;
B. the multi-path demodulation module reads the signal data to be demodulated in the corresponding footpath of this parameter respective channels according to the parameter that receives from the demodulation parameter configuration module, in the time period that this directly is assigned with this signal data is carried out demodulation;
C. the multi-path demodulation module stores is finished demodulated data.
2, signal multi-path demodulation method as claimed in claim 1 is characterized in that: among the step c, when demodulated data is finished in each storage, also deposit the channel number of corresponding demodulating data and footpath number in depositing the identical address of finishing demodulating data in.
3, signal multi-path demodulation method as claimed in claim 1 is characterized in that: when carrying out step a, per 64 clock cycle are divided into 8 parts, 8 clock cycle of every part are disposed any footpath to any channel.
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