CN1848827B - Channel estimating method and system for code division multiple access communication system - Google Patents
Channel estimating method and system for code division multiple access communication system Download PDFInfo
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Abstract
A method for estimating channel used on CDMA communication system includes dividing symbols in continuously demodulated special physical control channel to be continuously the first symbol set and the second symbol set as well as the third symbol set, using them to correspond separately to start stage and intermediate stage as well as end stage of multipath continuous demodulation course, applying channel estimation different to multisymbol moving average process to carry out channel estimation on the first and third symbol sets, applying multisymbol moving average process to carry out channel estimation on the second symbol set.
Description
Technical field
The present invention relates to the channel estimation methods of wireless communication system, the channel estimation methods of particularly a kind of Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wide CDMA) communication system.
Background technology
Along with developing rapidly of mobile communication, people require also more and more higher to the quality of mobile communication and the type of service that provides thereof, and the proposition of 3G (Third Generation) Moblie and development have met people's this demand just, therefore get most of the attention.Wideband Code Division Multiple Access (WCDMA) is (the 3rd Generation Partnership Project of 3-G (Generation Three mobile communication system) standardization body, 3GPP) the Radio Transmission Technology of Ti Chuing (Radio Transmission Technology, RTT) scheme, it not only can provide high-quality voice service, and can provide and the similar multimedia service of fixed network.
As shown in Figure 1, in broadband CDMA system, in order to improve uplink quality, at special physical controlling channel of upward (Dedicated Physical Control Channel, DPCCH) added the part frequency pilot sign in, be used for channel estimating and carry out coherent detection.The emission of frequency pilot sign is discontinuous, according to different time slot formats, number of pilot symbols in each time slot is between 3 to 8, therefore, adopt which kind of method accurately to estimate the characteristic of channel of interior frequency pilot sign section of time slot and data symbol section correspondence, seem of crucial importance in the receptivity under the high-speed mobile environment improving receiver.
(Dedicated Physical Channel, DPCH) frame structure as shown in Figure 1 for uplink dedicated physical channels DPCH.Every frame 10ms is divided into 15 time slots.Every time slot bit number is: 10
*2k, k=0 wherein ..., 6.(Dedicated Physical Control Channel, DPCCH) (Dedicated Physical Data Channel DPDCH) is parallel the transmission to Dedicated Physical Control Channel with Dedicated Physical Data Channel.
Channel estimation methods of the prior art mainly is the average channel estimation methods of many symbol-slips.This method has several characteristics:
Emphasizing time unifying, is exactly the symbol of the center of gravity alignment of the sliding window data channel that will compensate; Window slides, for the variation of the real-time tracking characteristic of channel; And the length of sliding window should select suitablely, and a compromise length of window is selected in generally compromise rapid fading and slow fading, perhaps estimates dynamically to adjust the length of window according to decline.
The average channel estimation methods of many symbol-slips highlights temporal alignment.But the information that in the demodulation starting and ending, always can lack historical symbol of part or following symbol, be used for asking average weighted data just to reduce like this, promptly being equivalent to sliding window has diminished, performance for estimating channel also reduces greatly, this is original for whole continuous demodulating process to be not very long situation just, performance will be subjected to very large influence, such as the message demodulation that inserts at random, just 1 frame or 2 frames altogether, also have such as in the compact model also being beginning and the end that demodulation constantly occurs, also have some signalings also may have only very short several frames, if according to the average channel estimation methods of many symbol-slips of prior art to history, current, following information weighting is average, because the incipient stage and the ending phase channel estimating of demodulation are very poor continuously, can cause whole demodulation performance to descend greatly so.
Summary of the invention
The object of the present invention is to provide a kind of channel estimation methods and system that is used for code division multiple address communication system, the channel estimating deterioration causes channel estimating performance to descend in the time of the beginning of the continuous demodulating process of solution multipath and end, thereby the problem that causes demodulation performance to descend is with effective raising channel estimating performance.
To achieve these goals, the invention provides a kind of channel estimation methods that is used for code division multiple address communication system, be used for calculating the corresponding channel estimation value constantly of each symbol of Dedicated Physical Control Channel of continuous demodulation, wherein, symbol in the Dedicated Physical Control Channel of demodulation is divided into the first continuous symbols by the demodulation order continuously, second symbols and the 3rd symbols, the incipient stage of the continuous demodulating process of the corresponding multipath of described first symbols, the interstage of the continuous demodulating process of the corresponding multipath of described second symbols, the ending phase of the continuous demodulating process of the corresponding multipath of described the 3rd symbols may further comprise the steps:
Step a: adopt a channel estimation methods that is different from many symbol-slips averaging method to carry out channel estimation process to described first symbols;
Step b: adopt many symbol-slips averaging method to carry out channel estimation process to described second symbols;
Step c: adopt a channel estimation methods that is different from many symbol-slips averaging method to carry out channel estimation process to described the 3rd symbols;
Described many symbol-slips averaging method carries out channel estimating to the history in the Dedicated Physical Control Channel, current, following 2n+1 symbol weighted average altogether.
The above-mentioned channel estimation methods that is used for code division multiple address communication system, wherein, the sliding window length of the Dedicated Physical Control Channel of described continuous demodulation is 2n+1, described n is a nonnegative integer, preceding n symbol of the Dedicated Physical Control Channel of described continuous demodulation formed described first symbols, last n symbol formed described the 3rd symbols, and described step a specifically may further comprise the steps:
Step a1: utilize many symbol-slips averaging method described first symbols to be handled first channel estimation value that obtains first symbols;
Step a2: utilize a second channel method of estimation that described first symbols is carried out channel estimation process, obtain the second channel estimated value of first symbols, compensation reduces the loss of significance that causes because of being used for the average weighted data of described many symbol-slips averaging method;
Step a3: the 3rd channel estimation value that first channel estimation value and the corresponding one by one addition of second channel estimated value of described first symbols obtained first symbols.
The above-mentioned channel estimation methods that is used for code division multiple address communication system, wherein, described step c specifically may further comprise the steps:
Step c1: utilize many symbol-slips averaging method described the 3rd symbols to be handled first channel estimation value that obtains described the 3rd symbols;
Step c2: utilize one the 3rd channel estimation methods that described the 3rd symbols is carried out channel estimation process, obtain the second channel estimated value of described the 3rd symbols, compensation reduces the loss of significance that causes because of being used for the average weighted data of described many symbol-slips averaging method;
Step c3: the 3rd channel estimation value that first channel estimation value and the corresponding one by one addition of second channel estimated value of described the 3rd symbols obtained the 3rd symbols.
The above-mentioned channel estimation methods that is used for code division multiple address communication system, wherein, described second channel method of estimation is utilized in preceding 2n+1 the symbol of described Dedicated Physical Control Channel and is not weighted on average by the symbol of described many symbol-slips averaging method utilization, obtains the second channel estimated value of described first symbols;
Described the 3rd channel estimation methods utilizes in last 2n+1 the symbol of described Dedicated Physical Control Channel and is not weighted on average by the symbol of described many symbol-slips averaging method utilization, obtains the second channel estimated value of described the 3rd symbols.
The above-mentioned channel estimation methods that is used for code division multiple address communication system wherein, is supposed last symbol that j+n symbol is continuous demodulation, k
1=n+1, n+2 ..., n+j,
The 3rd channel estimation value of described first symbols is
The channel estimation value of described second symbols is respectively
The 3rd channel estimation value of described the 3rd symbols is
Wherein a (i) is a weight coefficient, and c (i) is the symbol of Dedicated Physical Control Channel.
The above-mentioned channel estimation methods that is used for code division multiple address communication system, wherein, described second channel method of estimation multiply by the second channel estimated value that a correction factor obtains described first symbols with first channel estimation value of described first symbols;
Described the 3rd channel estimation methods multiply by the second channel estimated value that a correction factor obtains described the 3rd symbols with first channel estimation value of described the 3rd symbols.
The above-mentioned channel estimation methods that is used for code division multiple address communication system, wherein, the correction factor of described first symbols is
K wherein
2=1,2 ... n, the correction factor of described the 3rd symbols is
K wherein
3=j+1, j+2 ... j+n, wherein, the 3rd channel estimation value of described first symbols is respectively
The channel estimation value of described second symbols is respectively
K wherein
1=n+1, n+2 ..., n+j; The 3rd channel estimation value of described the 3rd symbols is respectively
Wherein a (i) is a weight coefficient, and c (i) is the symbol of Dedicated Physical Control Channel.
The above-mentioned channel estimation methods that is used for code division multiple address communication system, wherein, the symbol in the described Dedicated Physical Control Channel obtains according to following steps:
Estimate the non-pilot signal of each time slot according to the pilot signal of described DPDCH;
Non-pilot signal that utilize desirable pilot signal, estimates and the corresponding relevant symbol that obtains described Dedicated Physical Control Channel of original Dedicated Physical Control Channel symbol.
The above-mentioned channel estimation methods that is used for code division multiple address communication system, wherein, the symbol in the described Dedicated Physical Control Channel obtains according to following steps:
Utilize desirable pilot signal and the corresponding relevant symbol that obtains described Dedicated Physical Control Channel of original Dedicated Physical Control Channel symbol.
In order better to realize above-mentioned purpose, the present invention also provides a kind of channel estimation system that is used for code division multiple address communication system, be used for calculating the corresponding channel estimation value constantly of each symbol of Dedicated Physical Control Channel of continuous demodulation, wherein, symbol in the Dedicated Physical Control Channel of demodulation is divided into the first continuous symbols by the demodulation order continuously, second symbols and the 3rd symbols, the incipient stage of the continuous demodulating process of the corresponding multipath of described first symbols, the interstage of the continuous demodulating process of the corresponding multipath of described second symbols, the ending phase of the continuous demodulating process of the corresponding multipath of described the 3rd symbols comprises:
One first channel estimation process module is used for adopting many symbol-slips averaging method to carry out channel estimation process to described second symbols;
One second channel is estimated processing module, is used for adopting a channel estimation methods that is different from many symbol-slips averaging method to carry out channel estimation process to described first symbols and the 3rd symbols.
The above-mentioned channel estimation system that is used for code division multiple address communication system, wherein, the sliding window length of the Dedicated Physical Control Channel of described continuous demodulation is 2n+1, described n is a nonnegative integer, preceding n symbol in the described continuous demodulation formed described first symbols, last n symbol formed described the 3rd symbols, and described second channel estimates that processing module specifically comprises:
One the 3rd channel estimation process module utilizes many symbol-slips averaging method that described first symbols and the processing of the 3rd symbols are obtained one first channel estimation value;
One the 4th channel estimation process module, utilize a second channel method of estimation that described first symbols and the 3rd symbols are carried out channel estimation process, obtain a second channel estimated value, compensation reduces the loss of significance that causes because of being used for the average weighted data of described many symbol-slips averaging method, and described first channel estimation value and the corresponding one by one addition of second channel estimated value of described first symbols and the 3rd symbols obtained one the 3rd channel estimation value.
Channel estimation methods and the system that is used for code division multiple address communication system of the present invention, compared with prior art, beginning and ending phase to the continuous demodulating process of multipath have been done some special channels estimation processing, the loss of significance that has compensated the average weighted data minimizing of many symbol-slips averaging method and caused, performance to demodulating process has raising, especially some not long to continuous demodulating process scenes, such as the message demodulation that inserts at random, in the compact model, also have some to have only the signaling procedure of one or two frame, performance improves performance clearly, shows that all method and system of the present invention is significantly improved to systematic function in emulation and real system test.
The present invention is described in detail below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the frame structure of Wideband Code Division Multiple Access (WCDMA) (WCDMA) system uplink DPCH;
Fig. 2 is the system implementation block diagram of channel estimation methods of the present invention;
Fig. 3 is that first embodiment of the invention is at demodulation incipient stage channel estimation process schematic diagram;
Fig. 4 is that first embodiment of the invention is at demodulation interstage channel estimation process schematic diagram;
Fig. 5 is that first embodiment of the invention is at demodulation ending phase institute channel estimation process schematic diagram;
Fig. 6 is that second embodiment of the invention is at demodulation incipient stage channel estimation process schematic diagram;
Fig. 7 is that second embodiment of the invention is at demodulation ending phase channel estimation process schematic diagram; And
Fig. 8 is the handling process schematic diagram of channel estimation methods of the present invention.
Embodiment
Fig. 2 is the system implementation block diagram of the channel estimation methods that the present invention relates to.In this example, the analog-signal transitions that AD converter 201 will be input to receiver is that digital signal is sent into descrambling/despreading module 204, each bar multipath scrambler that descrambling/despreading module 204 utilizes code tracking device 202 and code generator 203 to produce carries out descrambling and de-spreading to input signal, and each multipath signal behind the descrambling and de-spreading sent into its corresponding channel estimating and compensating module 205, channel estimating and compensating module 205 calculate the channel estimation value in the corresponding moment of each symbol of DPCCH respectively and dedicated channel DPDCH are compensated, each footpath signal after the compensation outputs to high specific merging module 206 and carries out the high specific merging, signal after will merging at last is input to and carries out deinterleaving and decoding in deinterleaving/decoder 207, obtains the primary signal of transmitting terminal emission.The channel estimation methods that the present invention proposes is implemented in channel estimating and compensating module 205, implements channel estimation methods of the present invention according to handling process shown in Figure 8 in module 205, may further comprise the steps:
The incipient stage of continuous demodulating process is done the special channel that is different from the interstage estimate to handle, compensate that the average weighted data of many symbol-slips averaging method reduce and the loss of significance that causes;
Adopt the average method of many symbol-slips to do channel estimation process to the interstage of continuous demodulating process;
The ending phase of continuous demodulating process is done the special channel that is different from the interstage estimate to handle, compensate that the average weighted data of many symbol-slips averaging method reduce and the loss of significance that causes.
Be described for convenience, the present invention is that preceding n symbol among the DPCCH of continuous demodulation of 2n+1 (n is a nonnegative integer) formed first symbols to sliding window length, and last n symbol formed the 3rd symbols, and other is second symbols., wherein, the incipient stage of the continuous demodulating process of the corresponding multipath of first symbols, the interstage of the continuous demodulating process of the corresponding multipath of second symbols, the ending phase of the continuous demodulating process of the corresponding multipath of the 3rd symbols.
Below in conjunction with Fig. 2, Fig. 3, Fig. 4 and Fig. 5 the first embodiment of the present invention is described in detail.
In module 205, channel estimating and channel compensation are carried out the processing of the following aspects respectively:
Estimate the non-frequency pilot sign of each time slot with the frequency pilot sign of DPCCH, can omit this step if only do channel estimating with frequency pilot sign;
DPCCH symbol after obtaining being correlated with desirable frequency pilot sign and the non-frequency pilot sign that estimates (if only do channel estimating with frequency pilot sign then needn't use the non-frequency pilot sign that estimates) are relevant with corresponding original DPCCH symbol, be designated as c (i), i.e. Fig. 3 each symbol among the DPCCH in Fig. 7;
Utilize the average channel estimation methods of many symbol-slips to obtain first channel estimation value of first symbols and the 3rd symbols;
The length of supposing sliding window is 2n+1 DPCCH symbol, first symbols for the continuous demodulation incipient stage, promptly begin n symbol, be not weighted on average in preceding 2n+1 the symbol to DPCCH by the symbol of described many symbol-slips averaging method utilization, obtain the second channel estimated value of first symbols, for
K=1 ..., n, the first corresponding channel estimation value of first symbols that obtains with the average channel estimation methods of many symbol-slips again
Addition obtains the 3rd channel estimation value of first symbols
As shown in Figure 3, utilize at last
Compensate DPDCH (k), k=1 ..., n, wherein a (i) is a weight coefficient;
Second symbols for continuous demodulation pilot process, promptly n+1 symbol is to n+1 symbol reciprocal, as shown in Figure 4, utilize first channel estimation value of the second symbols correspondence that the average channel estimation methods of many symbol-slips obtains to compensate DPDCH (k), promptly adopt historical, current, following 2n+1 symbol weighted-average method altogether carried out channel estimating, promptly use
Compensate DPDCH (k);
The 3rd symbols for continuous demodulation ending phase, it is a last n symbol, suppose that j+n symbol is last symbol, utilize in last 2n+1 the symbol of DPCCH not to be weighted on average, obtain the second channel estimated value of the 3rd symbols by the symbol of many symbol-slips averaging method utilization
K=j+1 ..., j+n, the first corresponding channel estimation value of the 3rd symbols that obtains with the average channel estimation methods of many symbol-slips again
, k=j+1 ..., the j+n addition obtains the 3rd channel estimation value of the 3rd symbols correspondence
As shown in Figure 5, utilize at last
Compensate DPDCH (k), k=j+1 ..., j+n, wherein a (i) is a weight coefficient;
Below in conjunction with Fig. 2, Fig. 6, Fig. 4 and Fig. 7 the second embodiment of the present invention is described in detail.
In module 205, channel estimating and channel compensation are done the processing of following step respectively:
Estimate the non-frequency pilot sign of each time slot with the frequency pilot sign of DPCCH, can omit this step if only do channel estimating with frequency pilot sign;
DPCCH symbol after obtaining being correlated with desirable frequency pilot sign and the non-frequency pilot sign that estimates (if only do channel estimating with frequency pilot sign then needn't use the non-frequency pilot sign that estimates) are relevant with corresponding original DPCCH symbol, be designated as c (i), i.e. Fig. 3 each symbol among the DPCCH in Fig. 7;
Utilize the average channel estimation methods of many symbol-slips to obtain first channel estimation value of first symbols and the 3rd symbols;
The length of supposing sliding window is 2n+1 DPCCH symbol, first symbols for the continuous demodulation incipient stage, promptly begin n symbol, the method of signal amplitude is carried out channel estimating after adopting sliding window length progressively to be carried out the transition to 2n+1 and revised weighted average by n, and first channel estimation value of its correspondence be multiply by a coefficient
After add that the first original channel estimation value obtains the 3rd channel estimation value, promptly
Compensate DPDCH (k) with the 3rd channel estimation value at last, k=1 ..., n, wherein a (i) is a weight coefficient,
Be modifying factor, make when signal amplitude and interstage are handled after the weighted average close;
Second symbols for continuous demodulation pilot process, promptly n+1 symbol is to n+1 symbol reciprocal, as shown in Figure 4, utilize first channel estimation value of the second symbols correspondence that the average channel estimation methods of many symbol-slips obtains to compensate DPDCH (k), promptly adopt historical, current, following 2n+1 symbol weighted-average method altogether carried out channel estimating, promptly use
Compensate DPDCH (k);
The 3rd symbols for continuous demodulation ending phase, it is a last n symbol, as shown in Figure 7, adopt sliding window length progressively to carry out the transition to n and revise weighted average by 2n+1 after the method for signal amplitude carry out channel estimating, first channel estimation value of its correspondence be multiply by a coefficient
After add that the first original channel estimation value obtains the 3rd channel estimation value
Compensate DPDCH (k) with the 3rd channel estimation value at last, k=j+1 ..., j+n, wherein a (i) is a weight coefficient,
Be modifying factor, make when signal amplitude and interstage are handled after the weighted average close.
Also have some other that multi-path demodulation continuous process is begun to be the embodiment that special channel is estimated processing with ending phase, also can obtain better demodulation performance, just do not enumerate one by one at this than prior art.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (8)
1. channel estimation methods that is used for code division multiple address communication system, be used for calculating the corresponding channel estimation value constantly of each symbol of Dedicated Physical Control Channel of continuous demodulation, it is characterized in that, symbol in the Dedicated Physical Control Channel of demodulation is divided into the first continuous symbols by the demodulation order continuously, second symbols and the 3rd symbols, the incipient stage of the continuous demodulating process of the corresponding multipath of described first symbols, the interstage of the continuous demodulating process of the corresponding multipath of described second symbols, the ending phase of the continuous demodulating process of the corresponding multipath of described the 3rd symbols may further comprise the steps:
Step a: adopt a channel estimation methods that is different from many symbol-slips averaging method to carry out channel estimation process to described first symbols;
Step b: adopt many symbol-slips averaging method to carry out channel estimation process to described second symbols;
Step c: adopt a channel estimation methods that is different from many symbol-slips averaging method to carry out channel estimation process to described the 3rd symbols;
Wherein, described many symbol-slips averaging method carries out channel estimating to the history in the Dedicated Physical Control Channel, current, following 2n+1 symbol weighted average altogether, the sliding window length of the Dedicated Physical Control Channel of described continuous demodulation is 2n+1, preceding n symbol of the Dedicated Physical Control Channel of described continuous demodulation formed described first symbols, last n symbol formed described the 3rd symbols, and described n is a nonnegative integer; Described step a specifically may further comprise the steps:
Step a1: utilize many symbol-slips averaging method described first symbols to be handled first channel estimation value that obtains first symbols;
Step a2: utilize a second channel method of estimation that described first symbols is carried out channel estimation process, obtain the second channel estimated value of first symbols, compensation reduces the loss of significance that causes because of being used for the average weighted data of described many symbol-slips averaging method;
Step a3: the 3rd channel estimation value that first channel estimation value and the corresponding one by one addition of second channel estimated value of described first symbols obtained first symbols;
Described step c specifically may further comprise the steps:
Step c1: utilize many symbol-slips averaging method described the 3rd symbols to be handled first channel estimation value that obtains described the 3rd symbols;
Step c2: utilize one the 3rd channel estimation methods that described the 3rd symbols is carried out channel estimation process, obtain the second channel estimated value of described the 3rd symbols, compensation reduces the loss of significance that causes because of being used for the average weighted data of described many symbol-slips averaging method;
Step c3: the 3rd channel estimation value that first channel estimation value and the corresponding one by one addition of second channel estimated value of described the 3rd symbols obtained the 3rd symbols.
2. the channel estimation methods that is used for code division multiple address communication system according to claim 1 is characterized in that,
Described second channel method of estimation is utilized in preceding 2n+1 the symbol of described Dedicated Physical Control Channel and is not weighted on average by the symbol of described many symbol-slips averaging method utilization, obtains the second channel estimated value of described first symbols;
Described the 3rd channel estimation methods utilizes in last 2n+1 the symbol of described Dedicated Physical Control Channel and is not weighted on average by the symbol of described many symbol-slips averaging method utilization, obtains the second channel estimated value of described the 3rd symbols.
3. the channel estimation methods that is used for code division multiple address communication system according to claim 2 is characterized in that: suppose last symbol that j+n symbol is continuous demodulation, k
1=n+1, n+2 ..., n+j,
The 3rd channel estimation value of described first symbols is
The channel estimation value of described second symbols is respectively
The 3rd channel estimation value of described the 3rd symbols is
Wherein a (i) is a weight coefficient, and c (i) is the symbol of Dedicated Physical Control Channel, and i is a positive integer; J is a positive integer.
4. the channel estimation methods that is used for code division multiple address communication system according to claim 1 is characterized in that,
Described second channel method of estimation multiply by the second channel estimated value that a correction factor obtains described first symbols with first channel estimation value of described first symbols;
Described the 3rd channel estimation methods multiply by the second channel estimated value that a correction factor obtains described the 3rd symbols with first channel estimation value of described the 3rd symbols.
5. the channel estimation methods that is used for code division multiple address communication system according to claim 4 is characterized in that the correction factor of described first symbols is
K wherein
2=1,2...n, the correction factor of described the 3rd symbols is
K wherein
3=j+1, j+2...j+n, wherein, the 3rd channel estimation value of described first symbols is respectively
The channel estimation value of described second symbols is respectively
K wherein
1=n+1, n+2 ..., n+j; The 3rd channel estimation value of described the 3rd symbols is respectively
Wherein a (i) is a weight coefficient, and c (i) is the symbol of Dedicated Physical Control Channel, and i is a positive integer; J is a positive integer.
6. the channel estimation methods that is used for code division multiple address communication system according to claim 1 is characterized in that, the symbol in the described Dedicated Physical Control Channel obtains according to following steps:
Estimate the non-pilot signal of each time slot according to the pilot signal of DPDCH;
Non-pilot signal that utilize desirable pilot signal, estimates and the corresponding relevant symbol that obtains described Dedicated Physical Control Channel of original Dedicated Physical Control Channel symbol.
7. the channel estimation methods that is used for code division multiple address communication system according to claim 1 is characterized in that, the symbol in the described Dedicated Physical Control Channel obtains according to following steps:
Utilize desirable pilot signal and the corresponding relevant symbol that obtains described Dedicated Physical Control Channel of original Dedicated Physical Control Channel symbol.
8. channel estimation system that is used for code division multiple address communication system, be used for calculating the corresponding channel estimation value constantly of each symbol of Dedicated Physical Control Channel of continuous demodulation, it is characterized in that, symbol in the Dedicated Physical Control Channel of demodulation is divided into the first continuous symbols by the demodulation order continuously, second symbols and the 3rd symbols, the incipient stage of the continuous demodulating process of the corresponding multipath of described first symbols, the interstage of the continuous demodulating process of the corresponding multipath of described second symbols, the ending phase of the continuous demodulating process of the corresponding multipath of described the 3rd symbols comprises:
One first channel estimation process module is used for adopting many symbol-slips averaging method to carry out channel estimation process to described second symbols;
One second channel is estimated processing module, is used for adopting a channel estimation methods that is different from many symbol-slips averaging method to carry out channel estimation process to described first symbols and the 3rd symbols;
Wherein, the sliding window length of the Dedicated Physical Control Channel of described continuous demodulation is 2n+1, preceding n symbol in the Dedicated Physical Control Channel of described continuous demodulation formed described first symbols, last n symbol formed described the 3rd symbols, described n is a nonnegative integer, and described second channel estimates that processing module specifically comprises:
One the 3rd channel estimation process module utilizes many symbol-slips averaging method respectively described first symbols and the processing of the 3rd symbols to be obtained one first channel estimation value;
One the 4th channel estimation process module, utilize a second channel method of estimation respectively described first symbols and the 3rd symbols to be carried out channel estimation process, different symbol or the coefficients of distinct symbols group selection wherein, obtain a second channel estimated value, compensation is because of being used for the loss of significance that the minimizing of the average weighted data of described many symbol-slips averaging method causes, and the 3rd channel estimation value that described first channel estimation value and the corresponding one by one addition of second channel estimated value of described first symbols obtained first symbols; The 3rd channel estimation value that first channel estimation value and the corresponding one by one addition of second channel estimated value of described the 3rd symbols obtained the 3rd symbols.
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