CN1150705C - Adaptive W-CDMA coherent reception method and receiver for third generation mobile communication - Google Patents
Adaptive W-CDMA coherent reception method and receiver for third generation mobile communication Download PDFInfo
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Abstract
The present invention relates to a method which is an adaptive coherent reception method on the basis of signal measurement, which has specific processes that a primary common pilot channel (which is suitable for a descending receiver) or an ascending dedicated physical control channel (Uplink DPCCH which is suitable for an ascending receiver) removes the influence of disturbing codes and channelizing codes, the integral of an SF with certain length is made, an output bit is generated, and a signal-to-noise ratio Eb/It is measured. The output bit and a traffic channel bit after passed through a matched filter are used to make correlation reception, and a residual frequency difference delta f in a data stream after the correlation reception is measured. The primary common pilot channel in a next period or the length SF of the integral of the Uplink DPCCH is adaptively determined according to the two measuring results of the Eb/It and the delta f. A W-CDMA adaptive coherent receiver which is designed on the basis of the method of the present invention comprises the matched filter which can control the length of the integral, a signal-to-noise ratio measurer, an adaptive arithmetic controller, a time division switch, an adaptive refreshing clock, a residual frequency difference measurer, a conjugation taking device and a multiplier. The W-CDMA adaptive coherent reception method which is suggested by the present invention improves a demodulation signal-to-noise ratio, and ensures the stability of the demodulation signal-to-noise ratio under the conditions of low radio-frequency stability of a traveling platform and obvious speed changing movement feature or obvious non-stationary wireless channel feature of the traveling platform. Meanwhile, the processing time delay of demodulation user data is not increased, and consequently, a system performance is increased.
Description
(1) technical field:
The invention belongs to 3G (Third Generation) Moblie Wideband Code Division Multiple Access (WCDMA) (W-CDMA) technical field, especially design 3G (Third Generation) Moblie W-CDMA adaptive coherent method of reseptance and receiver.
(2) background technology:
Wideband Code Division Multiple Access (WCDMA) (W-CDMA) spread spectrum communication mode is one of 3-G (Generation Three mobile communication system) that is realizing at present.Outside the excellent specific properties such as it declines except the anti-interference and anti-multipath with conventional code division multiple access system, and power system capacity is big, and up, provisional capital employing coherent reception down, stronger to the adaptive capacity of channel, the error rate further reduces.But, in the W-CDMA system, only adopt automatic frequency control (AFC) can not eliminate the frequency difference instability of receiving-transmitting sides, Doppler frequency shift and channel random phase fully and disturb the influence that brings, these three some effects will influence the error rate of high-rate service to a great extent, need take W-CDMA adaptive coherent method of reseptance to overcome this three kinds of influences.
Traditional coherent reception method is that received signal is carried out despreading by the pilot channel matched filter, obtain pilot frequency channel signal, received signal is carried out despreading by the Traffic Channel matched filter simultaneously, obtains service bits stream, and both output is used for coherent demodulation.This coherent reception method has adopted fixing structure, and it is high to adapt to the travelling carriage radio frequency stability, the travelling carriage speed change move or wireless channel non-stationary characteristic significant situation under the transmission of high speed digit rate.
The object of the present invention is to provide a kind of adaptive coherent method of reseptance and receiver that is applicable to 3G (Third Generation) Moblie W-CDMA physical layer architecture.It is not high that this method and receiver can adapt to the travelling carriage radio frequency stability, the travelling carriage speed change move or the significant situation of wireless channel non-stationary characteristic under high speed digit rate transmission.
(3) summary of the invention:
Technical scheme of the present invention is as follows:
The method of invention is that the adaptive coherent on the signal measurement basis receives.
The inventive method is Primary Common Pilot Channel (being applicable to downlink receiver) or special physical controlling channel of upward (Uplink DPCCH, be applicable to uplink receiver) removal scrambler and channel code influence, do the integration of length SF (value is between 4-256), produce the output bit, measure its signal to noise ratio Eb/It.Re-use above-mentioned output bit and do correlation reception, the residual frequency difference Δ f after the measurement correlation reception in the data flow through the Traffic Channel bit behind the matched filter.According to above-mentioned two measurement result Eb/It and Δ f, the integration lengths SF of adaptive determining interior Primary Common Pilot Channel of following one-period or Uplink DPCCH.
Uplink DPCCH removes scrambler and channel code influence, does the integration of length SFc (value is between 4-256), produces the output bit, measures its signal to noise ratio Eb/It.The Uplink DPDCH that re-uses above-mentioned output bit and process matched filter does correlation reception, residual frequency difference Δ f in the data flow after the correlation reception that measures.According to Eb/It and Δ f, the integration lengths SFc of adaptive determining Uplink DPCCH in following one-period.
The value of the said thresholding of the inventive method can be fixed, also can the self adaptation adjustment.
The W-CDMA adaptive coherent receiver that designs based on the inventive method comprises the matched filter of controlled integration lengths, snr measurement device, the adaptive algorithm controller, time-division switching, self adaptation refresh clock, residual frequency difference measuring appliance is got conjugator, multiplier.The physical layer architecture different according to the W-CDMA uplink and downlink, the descending self-adapting coherent receiver is slightly different with up adaptive coherent receiver.
Wherein, descending self-adapting coherent receiver structure is as follows, and the input of the matched filter of the controlled integration lengths of Primary Common Pilot Channel is the baseband receiving signals of travelling carriage, the output bifurcation, one links to each other with the snr measurement device, another with get conjugator and link to each other.The output of snr measurement device links to each other with the input of adaptive algorithm controller.The matched filter input of Traffic Channel is the baseband receiving signals of travelling carriage, and output links to each other with the input of multiplier, and another input of this multiplier links to each other with the output of getting conjugator.The output of multiplier links to each other with time-division switching.The output bifurcation of time-division switching, an output downlink dedicated physical control channel (DownlinkDPCCH) is to residual frequency difference measuring appliance, and another exports downlink dedicated physical data channel (Downlink DPDCH), promptly many bit user data streams.Residual frequency difference measuring appliance outputs to the adaptive algorithm controller.The SFp that the output of adaptive algorithm controller refreshes is to the matched filter of the controlled integration lengths of Primary Common Pilot Channel.Three of self adaptation refresh clock outputs divide to be clipped to snr measurement device, residual frequency difference measuring appliance and adaptive algorithm controller.
The structure of up adaptive coherent receiver is to descending similar substantially, structure is as follows, and the input of the matched filter of the controlled integration lengths of Uplink DPCCH is the baseband receiving signals of base station, the output bifurcation, one links to each other with the snr measurement device, another with get conjugator and link to each other.The output of snr measurement device links to each other with the input of adaptive algorithm controller.The matched filter input of up Dedicated Physical Data Channel (Uplink DPDCH) is the baseband receiving signals of travelling carriage, and output links to each other with the input of multiplier, and another input of this multiplier links to each other with the output of getting conjugator.The output of multiplier links to each other with the input of residual frequency difference measuring appliance, and exports many bit user data streams simultaneously.Residual frequency difference measuring appliance outputs to the adaptive algorithm controller.The SFc that the output of adaptive algorithm controller refreshes is to the matched filter of the controlled integration lengths of Uplink DPCCH.Three of self adaptation refresh clock outputs divide to be clipped to snr measurement device, residual frequency difference measuring appliance and adaptive algorithm controller.
Beneficial effect of the present invention is as follows:
The W-CDMA adaptive coherent method of reseptance that the present invention proposes, improve the demodulation signal to noise ratio, guaranteed that the travelling carriage radio frequency stability is not high, the travelling carriage speed change move or the significant situation of wireless channel non-stationary characteristic under the stability of demodulation signal to noise ratio, do not increase the processing time-delay of demodulation user data simultaneously, thereby improved systematic function.
(4) description of drawings:
Fig. 1 is a W-CDMA down link self adaption receiver schematic diagram.
Fig. 2 is a W-CDMA adaptive uplink receiver schematic diagram.
(5) embodiment:
Below in conjunction with description of drawings working of an invention optimal way:
As shown in Figure 1:
Make following agreement for convenience of description: the scrambler S of Primary Common Pilot Channel
P, the channel code C of Primary Common Pilot Channel
P, the scrambler S of user traffic channel
D, the channel code C of user traffic channel
D, the refresh cycle of adaptive algorithm: T
A
Wherein, 1 is the matched filter of the controlled integration lengths of Primary Common Pilot Channel, and 2 is the matched filter of Traffic Channel, 3 is the snr measurement device, 4 is the adaptive algorithm controller, and 5 is the self adaptation refresh clock, and 6 is time-division switching, 7 is residual frequency difference measuring appliance, 8 is many bit user data outputs, and 9 is the signal to noise ratio Eb/It of snr measurement device 3 outputs, and 10 is the residual frequency difference Δ f of residual frequency difference measuring appliance 7 outputs, 11 SFp that refresh for 4 outputs of adaptive algorithm controller, 12 for getting conjugator.
As shown in Figure 2:
Make following agreement for convenience of description: the scrambler of Uplink DPCCH and Uplink DPDCH is: S
D, the channel code of Uplink DPCCH: C
C, the channel code of Uplink DPDCH: C
D, the refresh cycle of adaptive algorithm: T
A
Wherein, 13 is the matched filter of the controlled integration lengths of Uplink DPCCH, 14 is the matched filter of Uplink DPDCH, 15 is the snr measurement device, 16 is the adaptive algorithm controller, 17 is the self adaptation refresh clock, 18 is residual frequency difference measuring appliance, 19 is the signal to noise ratio Eb/It of snr measurement device 15 outputs, 20 is the residual frequency difference Δ f of residual frequency difference measuring appliance 18 outputs, 21 the SFc that refresh for 16 outputs of adaptive algorithm controller, 22 for getting conjugator, and 23 is the output of many bit user data stream.
Referring to Fig. 1
The code stream of matched filter 1 despreading of the controlled integration lengths of Primary Common Pilot Channel contains the factor (1 one j) by the decision of W-CDMA Primary Common Pilot Channel modulating characteristic, because W-CDMA Primary Common Pilot Channel transmitting terminal has been modulated a factor (1+j).
Snr measurement device 3 can adopt various snr measurement algorithms, its output signal is that the residual frequency difference measuring appliance 7 of Eb/It. can adopt various residual frequency difference Measurement Algorithm, each subchannel among the Downlink DPCCH is carried out residual frequency difference to be measured, usually use the pilot subchannel among the Downlink DPCCH to carry out residual frequency difference measurement, its output signal is Δ f.The output signal Δ f of the output signal Eb/It of snr measurement device 3 and residual frequency difference measuring appliance 7 is input to adaptive algorithm controller 4.
Can have multiple adaptive algorithm in the adaptive algorithm controller 4, the general formula of this class adaptive algorithm is
Wherein, SF
P[n] represents n employed SF of self adaptation cycle
P,
Represent what n self adaptation period measurement went out
Δ f[n] n Δ f that the self adaptation period measurement goes out of expression.
Provide a kind of the most frequently used gradient adaptive algorithm now:
The discriminant function in n self adaptation cycle is:
Self adaptation refreshes rule:
Wherein, φ [n] is a discriminant function, and SIR_TH is a signal-noise ratio threshold, f
C(f among the W-CDMA
C=3.84MHz) be the frequency of chip, α (α＞0) is a weight factor, φ _ th1 and φ _ th2 are the discriminant function thresholding, SF
P_ MAX and SF
p_ MIN is the maximum occurrences and the minimum value of spreading factor respectively, and max () and min () are respectively and get max function and get minimum value function.
The cycle of self adaptation refresh clock 5 is T
A, get T usually
A=kT
SLOT, k ∈ N,
This clock is used for controlling snr measurement device 3,, adaptive algorithm controller 4, residual frequency difference measuring appliance 7 synchronous workings.
Time-division switching 6 belongs to DownlinkDPCCH according to which bit in the regulation decision Traffic Channel of W-CDMA system, and which bit belongs to Downlink DPDCH.Many bit user data output 8 is of time-division switching 6 outputs, is Downlink DPDCH, promptly many bit user data streams, and certainly, many bit user data outputs 8 subsequent operation such as also need to decode just can obtain truly user data.
Getting conjugator 12 is used for the input complex signal is exported after getting conjugation.
Referring to Fig. 2
The matched filter 13 of the controlled integration lengths of Uplink DPCCH and the matched filter 14 of Uplink DPDCH have used same scrambler.The code stream of despreading contains the factor (j), this is by the decision of the up modulating characteristic of W-CDMA, because Uplink DPCCH transmitting terminal has been modulated a factor j in the matched filter 13 of the controlled integration lengths of Uplink DPCCH.Snr measurement device 15, adaptive algorithm controller 16, self adaptation refresh clock 17, residual frequency difference measuring appliance 18, it is similar with the corresponding construction in the accompanying drawing 1 to get conjugator 22.
Getting conjugator 12 in the adaptive coherent receiver of above-mentioned down link also can be replaced by channel estimation filters or loop filter.
Getting conjugator 22 in the adaptive coherent receiver of above-mentioned up link also can be replaced by channel estimation filters or loop filter.
Adaptive algorithm controller 4 also can use other adaptive algorithm to replace the gradient adaptive algorithm in the adaptive coherent method of reseptance of above-mentioned down link.
Adaptive algorithm controller 16 also can use other adaptive algorithm to replace the gradient adaptive algorithm in the adaptive coherent method of reseptance of above-mentioned up link.
In the baseband receiving signals of travelling carriage, isolate multipath signal in the adaptive coherent method of reseptance of above-mentioned down link, use RAKE to merge then, each has all used the structure of the adaptive coherent method of reseptance of the W-CDMA down link among the present invention in that RAKE merges, with many bit user data stream addition of all these branches, merge the customer traffic of output as RAKE at last.
In the baseband receiving signals of base station, isolate multipath signal in the adaptive coherent method of reseptance of above-mentioned up link, use RAKE to merge then, each has all used the structure of the adaptive coherent method of reseptance of the W-CDMA up link among the present invention in that RAKE merges, with many bit user data stream addition of all these branches, merge the customer traffic of output as RAKE at last.
Thresholding can all be fixed in the above-mentioned adaptive coherent receiver, perhaps all self adaptation adjustment, and perhaps a part is fixed, and another part self adaptation is adjusted.
Claims (8)
1. 3G (Third Generation) Moblie W-CDMA adaptive coherent method of reseptance, its downlink method is pressed following flow process: the influence of scrambler and channel code in the removal Primary Common Pilot Channel, do the integration of a certain length SFp, produce the output bit, measure its signal to noise ratio Eb/It, re-use above-mentioned output bit and do correlation reception with Traffic Channel through matched filter, data flow after the correlation reception that obtains is through behind the time-division switching, one of output is the downlink dedicated physical control channel, measure the residual frequency difference Δ f in this downlink dedicated physical control channel, according to Eb/It and Δ f, the integration lengths SFp of adaptive determining Primary Common Pilot Channel in following one-period;
Its uplink link method is pressed following flow process: special physical controlling channel of upward is removed scrambler and channel code influence, do the integration of a certain length SFc, produce the output bit, measure its signal to noise ratio Eb/It, re-use above-mentioned output bit and do correlation reception with special physical controlling channel of upward through matched filter, residual frequency difference Δ f in the data flow after the correlation reception that measures, according to Eb/It and Δ f, the integration lengths SFc of adaptive determining special physical controlling channel of upward in following one-period.
2. a 3G (Third Generation) Moblie W-CDMA adaptive coherent receiver is characterized in that the matched filter by controlled integration lengths, snr measurement device, adaptive algorithm controller, time-division switching, self adaptation refresh clock, residual frequency difference measuring appliance, get conjugator, multiplier is formed, wherein:
A, in the down link self adaption coherent receiver, the input of the matched filter of the controlled integration lengths of Primary Common Pilot Channel is the baseband receiving signals of travelling carriage, the output bifurcation, one links to each other with the snr measurement device, another with get conjugator and link to each other, the output of snr measurement device links to each other with the input of adaptive algorithm controller, the matched filter input of Traffic Channel is the baseband receiving signals of travelling carriage, output links to each other with the input of multiplier, another input of this multiplier links to each other with the output of getting conjugator, the output of multiplier links to each other with time-division switching, the output bifurcation of time-division switching, an output downlink dedicated physical control channel is to residual frequency difference measuring appliance, another output downlink dedicated physical data channel, be many bit user data streams, residual frequency difference measuring appliance outputs to the adaptive algorithm controller, the integration lengths SFp that the output of adaptive algorithm controller refreshes is to the matched filter of the controlled integration lengths of Primary Common Pilot Channel, three of self adaptation refresh clock outputs, divide and be clipped to snr measurement device, residual frequency difference measuring appliance and adaptive algorithm controller;
B, in the adaptive uplink coherent receiver, the input of the matched filter of the controlled integration lengths of special physical controlling channel of upward is the baseband receiving signals of base station, the output bifurcation, one links to each other with the snr measurement device, another with get conjugator and link to each other, the output of snr measurement device links to each other with the input of adaptive algorithm controller, the matched filter input of up Dedicated Physical Data Channel is the baseband receiving signals of travelling carriage, output links to each other with the input of multiplier, another input of this multiplier links to each other with the output of getting conjugator, the output of multiplier links to each other with the input of residual frequency difference measuring appliance, and export many bit user data simultaneously and flow, residual frequency difference measuring appliance outputs to the adaptive algorithm controller, the integration lengths SFc that the output of adaptive algorithm controller refreshes is to the matched filter of the controlled integration lengths of special physical controlling channel of upward, three of self adaptation refresh clock outputs divide to be clipped to snr measurement device, residual frequency difference measuring appliance and adaptive algorithm controller.
3. 3G (Third Generation) Moblie W-CDMA adaptive coherent receiver as claimed in claim 2 is characterized in that getting conjugator 12 and also can be replaced by channel estimation filters or loop filter.
4. 3G (Third Generation) Moblie W-CDMA adaptive coherent receiver as claimed in claim 2 is characterized in that getting conjugator 22 and also can be replaced by channel estimation filters or loop filter.
5. 3G (Third Generation) Moblie W-CDMA adaptive coherent method of reseptance as claimed in claim 1 is characterized in that also can using in the adaptive algorithm controller 4 other adaptive algorithm to replace the gradient adaptive algorithm.
6. a kind of 3G (Third Generation) Moblie W-CDMA adaptive coherent method of reseptance as claimed in claim 1 is characterized in that using in the adaptive algorithm controller 16 other adaptive algorithm to replace the gradient adaptive algorithm.
7. require described 3G (Third Generation) Moblie W-CDMA adaptive coherent method of reseptance as right 1, it is characterized in that in the baseband receiving signals of travelling carriage, isolating multipath signal, use RAKE to merge then, each has all used the structure of the adaptive coherent method of reseptance of the W-CDMA down link among the present invention in that RAKE merges, with many bit user data stream addition of all these branches, merge the customer traffic of output as RAKE at last.
8. a kind of 3G (Third Generation) Moblie W-CDMA adaptive coherent method of reseptance as claimed in claim 1 is characterized in that wherein thresholding can all be fixed, perhaps all self adaptation adjustment, and perhaps a part is fixed, and another part self adaptation is adjusted.
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