CN1212711C - Space-time emission diversity receiver for indication channel of movable WCDMA communication system and its receiving method - Google Patents

Space-time emission diversity receiver for indication channel of movable WCDMA communication system and its receiving method Download PDF

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CN1212711C
CN1212711C CN 02136069 CN02136069A CN1212711C CN 1212711 C CN1212711 C CN 1212711C CN 02136069 CN02136069 CN 02136069 CN 02136069 A CN02136069 A CN 02136069A CN 1212711 C CN1212711 C CN 1212711C
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channel
signal
output
descrambling
fading channel
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CN1469565A (en
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于泽洋
吴琼
蔡立羽
曹鹏志
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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Abstract

The present invention relates to a space-time emission diversity receiver and a receiving method thereof for the indication channels of a movable WCDMA communication system. The space-time emission diversity receiver comprises a path searching and channel estimating device, a first and a second groups of descramble de-spread devices, a first and a second maximum ratio combining devices, a de-distributor and a summator, wherein the path searching and channel estimating device receives public pilot channel signals and baseband signals which are output to the descramble de-spread devices after matched and filtered, and each descramble de-spread device simultaneously receives the public pilot channel signals and the baseband signals which are output to the summator after processed. The present invention is characterized in that the space-time emission diversity receiver also comprises a first and a second fading channel estimators, a fading channel de-distributor, a second summator and a fading channel compensator, wherein signals which are output from the first and the second fading channel estimators are respectively output to the second summator after passing through the fading channel de-distributor, and signals which are output from the summator and the second summator are output again after respectively output to the fading channel compensator. Therefore, the received signals which are sensitive to amplitudes are improved, and the receiving performance of channels are obviously enhanced.

Description

WCDMA mobile communication system space-time emission diversity receiver for indication channel and method of reseptance thereof
Technical field
The invention belongs to the digital wireless communication field, be specifically related to WCDMA (Wideband Code Division Multiple Access (WCDMA)) mobile communication system indicating channel STTD (space-time emission diversity) receiver and method of reseptance thereof.
Background technology
The indicating channel of WCDMA (Wideband Code Division Multiple Access (WCDMA)) mobile communication system is a kind of common down channel, wherein AICH, AP-AICH, CD/CA-ICH channel have 0 ,+1 ,-1 three kind of value, encode by Hadamard (Hadamard) code conversion during coding.Thereby the signal of transmission is a multi-valued signal.Receiving terminal is deciphered with Hadamard sign indicating number inverse transformation.Therefore, these several channel receptivities are relatively more responsive to the amplitude characteristic of fading channel, must remove amplitude information when receiving.
WCDMA mobile communication system indicating channel can adopt the STTD receive mode, and it receives and uses Common Pilot Channel to do phase reference.
Fig. 1 is to use the routine of STTD to adopt the structure of the Rake receiver of high specific merging, comprise: a route searching and channel estimator 111, first, second two groups of descrambling and de-spreading devices 12,13, first, second two maximal ratio combiners 14,15, one are separated a branch storage 16 and an adder 17; Described route searching and channel estimator 111 receive Common Pilot Channel signal and baseband signal, output to two groups of descrambling and de-spreading devices 12,13 after matched filtering, each the descrambling and de-spreading device 12,13 in these two groups of descrambling and de-spreading devices also receives Common Pilot Channel signal and baseband signal respectively simultaneously; Output to first maximal ratio combiner 14 from the descrambling and de-spreading signal of first group of descrambling and de-spreading device, 12 outputs, after merging, output to adder 17; Output to after second maximal ratio combiner 15 merges from the descrambling and de-spreading signal of second group of descrambling and de-spreading device 13 output and to separate branch storage 16, after separating diversity, output to adder 17.
In route searching and channel estimator 111, obtain the timing information and the channel estimation value of each paths; Utilize timing information and channel estimation value that receive channel is carried out descrambling and de-spreading in (1)-(n) of first group of descrambling and de-spreading device 12, n is the path number that is received; Signal behind the descrambling and de-spreading merges the back through high specific and exports as decoded signal.
In Fig. 1, in (1)～(n) of the first descrambling and de-spreading device 12 and the first antenna multipath one is corresponding, in (n+1)～(2n) of the second descrambling and de-spreading device 13 and the second antenna multipath one is corresponding, route searching is used to detect the synchronous of multipath signal with channel estimator 11 route searchings and channel estimator 11, provide the timing information of every paths and (n+1)～(2n) that channel estimation value is given the second descrambling and de-spreading device 13, second maximal ratio combiner carries out high specific to each footpath signal of descrambling and de-spreading device output and merges.
Generally speaking, route searching and channel estimator 11 be by forming the sliding correlation detector of continuous slip (sliding), perhaps form by the matched filter that is complementary with spreading code, or similar device.When the pilot signal of using first antenna is correlated with or during filtering, is obtained the timing and the channel estimating information of first antenna; When the pilot signal of using second antenna is correlated with or during filtering, is obtained the timing and the channel estimating information of second antenna.
The course of work of Rake receiver shown in Figure 1 is: at first, the multipath state of route searching and channel estimator 11 measured channel detects the path.Route searching and channel estimator 11 are sequentially operated (1)～(n) of the first descrambling and de-spreading device 12 and (n+1)～(2n) of the second descrambling and de-spreading device 13 in the detected cycle in path.That is, each of (n+1)～(2n) of the second descrambling and de-spreading device 13 receives different multi-path signals.
Multipath searching and channel estimator 11 provide two-way and output to two groups of descrambling and de-spreading devices: timing relationship (a road) and channel estimation value (b road); Two groups of descrambling and de-spreading devices utilize timing relationship and channel estimation value that input signal is operated, and realize the multi-path location alignment, remove phase place rotation and descrambling and de-spreading that channel brings, provide the restituted signal of Dan Jing.
The output of two groups of descrambling and de-spreading devices 12,13 is by two maximal ratio combiner 14,15 combinations respectively.Obtain the signal of first antenna after the signal combination of first antenna; After merging, the signal of second antenna to then by the signal plus of adder 17 and first antenna, obtain the received signal of conventional Rake through separating diversity 16.
In each parts of conventional STTD diversity Rake, the conversion of signal is as follows:
Do not consider additive noise (down together), establishing first antenna emission useful signal is S 0, become abS through spectrum-spreading and scrambling 0, become through behind the multipath:
S 1 ( t ) = a ( t - τ 1 ) b ( t - τ 1 ) A 1 e j φ 1 S 0 ( t - τ 1 ) + . . . + a ( t - τ n ) b ( t - τ n ) A n e j φ n S 0 ( t - τ n )
If first antenna pilot channel signal after the spectrum-spreading and scrambling of emission is S 2, then become through behind the multipath:
S 3 ( t ) = A 1 e j φ 1 S 2 ( t - τ 1 ) + . . . + A n e j φ n S 2 ( t - τ n )
The channel estimation value that obtains each paths in route searching and the channel estimator 11 is A 1e J φ 1, A 2e J φ 2To A ne J φ n, timing information is τ 1, τ 2... τ n
Utilize timing information and channel estimation value that receive channel is carried out descrambling and de-spreading in the descrambling and de-spreading device 2 (1)～2 (n), obtain removing signal A behind the descrambling and de-spreading of Dan Jing of time delay k 2e J φ kS 0
The descrambling and de-spreading signal of delaying when maximal ratio combiner is the handle removal carries out addition, first aerial signal that obtains receiving, promptly S 1 ′ = ( A 1 2 + A 2 2 + . . . + A n 2 ) S 0 .
The emission useful signal of second antenna is treated burst.If the signal after the conversion is S 4, through spectrum-spreading and scrambling process, pass through multipath channel again after, signal becomes:
S 5 ( t ) = a ( t - τ n + 1 ) b ( t - τ n + 1 ) A n + 1 e jφn + 1 S 4 ( t - τ n + 1 ) + . . .
+ a ( t - τ 2 n ) b ( t - τ 2 n ) A 2 n e jφ 2 n S 4 ( t - τ 2 n )
If second antenna pilot channel signal after the spectrum-spreading and scrambling of emission is S 6, then become through behind the multipath:
S 7 ( t ) = A n + 1 e j φ n + 1 S 6 ( t - τ n + 1 ) + . . . + A n + n e j φ n + n S 6 ( t - τ n + n )
Process and first processing that antenna is same, through the process of the signal behind route searching and channel estimator 11 and the descrambling despreader 2 (n+1)～2 (2n) maximal ratio combiner 3 (2), second aerial signal that obtains receiving, S 2 ′ = ( A n + 1 2 + A n + 2 2 + . . . + A n + n 2 ) S 4 .
The signal of second antenna separated obtains the useful signal that will receive after the diversity:
S 2 ′ ′ = ( B n + 1 2 + B n + 2 2 + . . . + B n + n 2 ) S 0
B wherein N+1 2+ B N+2 2+ ...+B N+n 2Be S 0The fading channel characteristic of experience when corresponding signal transmits on second antenna.
At last, the signal of two antennas is merged, obtains the final signal that receives of conventional Rake by adder:
S = ( A 1 2 + . . . + A n 2 + B n + 1 2 + . . . + B n + n 2 ) S 0
What receive with conventional Rake receiver is a received signal that comprises decline information, and signal amplitude changes with channel, is unfavorable for further deciphering with Hadamard sign indicating number inverse transformation.Therefore must in received signal, remove channel effect fully.
Summary of the invention
The objective of the invention is to have the deficiency of Rake now, and a kind of high-performance WCDMA mobile communication system space-time emission diversity receiver for indication channel and method of reseptance thereof with receiving system of removing the fading channel amplitude characteristic is provided as the indicating channel receiving system of STTD reception in order to overcome.
The technical scheme that the present invention takes is: WCDMA mobile communication system space-time emission diversity receiver for indication channel, comprise: a route searching and channel estimator, first, second two groups of descrambling and de-spreading devices, first, second two maximal ratio combiners, one separates a branch storage and an adder; Described route searching and channel estimator receive Common Pilot Channel signal and baseband signal, output to two groups of descrambling and de-spreading devices after matched filtering, each the descrambling and de-spreading device in these two groups of descrambling and de-spreading devices also receives Common Pilot Channel signal and baseband signal respectively simultaneously; Output to first maximal ratio combiner from the descrambling and de-spreading signal of first group of descrambling and de-spreading device output, after merging, output to adder; Output to after second maximal ratio combiner merges from the descrambling and de-spreading signal of second group of descrambling and de-spreading device output and to separate the branch storage, after separating diversity, output to adder; Be characterised in that: also comprise: first, second two fading channel estimators, fading channels are separated branch storage, a second adder and a fading channel compensator; Described signal from route searching and channel estimator output is also delivered to first, second two fading channel estimators respectively; Output to second adder from the signal of first fading channel estimator output; After separating the branch storage, fading channel outputs to second adder from the signal of second fading channel estimator output; Output to output again behind the fading channel compensator respectively from the signal of adder and second adder output.
Above-mentioned WCDMA mobile communication system space-time emission diversity receiver for indication channel, wherein: the descrambling and de-spreading device in first, second two groups of descrambling and de-spreading devices respectively is n.
The method that adopts above-mentioned WCDMA mobile communication system space-time emission diversity receiver for indication channel to carry out diversity reception may further comprise the steps:
A, system front end receive the baseband signal that contains Common Pilot Channel and indicating channel signal, deliver to route searching and channel estimator;
B, utilize the Common Pilot Channel signal to carry out matched filtering to carry out Multipath searching and channel estimating, obtain the position and the channel estimation value in every footpath;
C, baseband signal be by two groups of descrambling and de-spreading devices, and each descrambling and de-spreading device utilizes the position in route searching and every footpath of channel estimator output and channel estimation value to the signal removal time delay of individual paths and carry out descrambling and de-spreading, obtains the signal behind the descrambling and de-spreading;
D, by two maximal ratio combiners, respectively each the road signal behind two groups of descrambling and de-spreadings is carried out high specific and merges;
The output signal of e, second maximal ratio combiner is separated the branch storage by one, and second aerial signal through the high specific merging that receives separated diversity;
The signal of f, first maximal ratio combiner output is conciliate and is divided the signal of storage output to merge by an adder, obtains comprising the indicating channel signal of fading channel characteristic;
Be characterized in, further comprising the steps of:
The channel estimation value of g, route searching and channel estimator output obtains the fading characteristic of first, second antenna transmission signal of diversity signal by two fading channel estimators;
The signal fadeout characteristic of h, second antenna transmission is separated the branch storage by fading channel and is separated the diversity processing;
I, separate after the diversity the fading channel characteristic of second antenna experience and the fading channel characteristic of first antenna experience by a second adder addition, obtain total fading channel characteristic;
J, the total received signal of not removing the fading channel characteristic and total fading channel characteristic be by a fading channel compensator, and diversity reception is finished in the influence that utilizes the information of fading channel estimator output to remove the fading channel amplitude.
The method that above-mentioned WCDMA mobile communication system space-time emission diversity receiver for indication channel carries out diversity reception, wherein, the number of the described descrambling and de-spreading device of step c is the number in the footpath that received.
The method that above-mentioned WCDMA mobile communication system space-time emission diversity receiver for indication channel carries out diversity reception wherein, respectively has n in the described two groups of descrambling and de-spreading devices of step c.
The method that above-mentioned WCDMA mobile communication system space-time emission diversity receiver for indication channel carries out diversity reception, wherein, the described fading channel compensator of step j is a divider, the total received signal after the high specific merging and the total channel characteristic of fading channel estimator are divided by, obtain removing the signal of fading channel characteristic.
Description of drawings
Purpose of the present invention, effect, characteristics and advantage are further specified by following embodiment and accompanying drawing thereof.
Fig. 1 is the Rake receiver block diagram of the STTD diversity of routine.
Fig. 2 WCDMA mobile communication system of the present invention space-time emission diversity receiver for indication channel schematic diagram.
Embodiment
See also Fig. 2, this is the structural representation of WCDMA mobile communication system space-time emission diversity receiver for indication channel of the present invention.
WCDMA mobile communication system space-time emission diversity receiver for indication channel of the present invention, comprise a route searching and channel estimator 11, first, second two groups of descrambling and de-spreading devices 12,13, first, second two maximal ratio combiners 14,15, one are separated a branch storage 16 and an adder 17; Described route searching and channel estimator 11 receive Common Pilot Channel signal and baseband signal, output to two groups of descrambling and de-spreading devices 12,13 after matched filtering, each the descrambling and de-spreading device in these two groups of descrambling and de-spreading devices also receives Common Pilot Channel signal and baseband signal respectively simultaneously; Output to first maximal ratio combiner 14 from the descrambling and de-spreading signal of first group of descrambling and de-spreading device, 12 outputs, after merging, output to adder 17; Output to after second maximal ratio combiner 15 merges from the descrambling and de-spreading signal of second group of descrambling and de-spreading device 13 output and to separate branch storage 16, after separating diversity, output to adder 17; Also comprise first, second two fading channel estimators 21,22, fading channel is separated branch storage 23, a second adder 24 and a fading channel compensator 25 (shown in the frame of broken lines among the figure); Described signal from route searching and channel estimator 11 outputs is also delivered to first, second two fading channel estimators 21,22 respectively; Output to second adder 24 from the signal of the first fading channel estimator, 21 outputs; After separating branch storage 23, fading channel outputs to second adder 24 from the signal of the second fading channel estimator, 22 outputs; Output to output again behind the fading channel compensator 25 respectively from the signal of adder 17 and second adder 24 outputs.
In the present invention:
Route searching and channel estimator 11 utilize the Common Pilot Channel signal to carry out matched filtering and realize Multipath searching and channel estimating, and it provides the position τ in every footpath kWith channel estimation value A ke J φ k
The result who utilizes the pilot signal of first antenna to obtain exports on a1 and b1 in timing information and estimated value to first antenna; Utilize result that the pilot signal of second antenna obtains in timing information and estimated value to second antenna, a2 and b2 go up output.
In two groups of descrambling and de-spreading devices 12,13, each is removed time delay and carries out descrambling and de-spreading the signal of individual paths.The number of descrambling and de-spreading device is exactly the number in the footpath that received, and wherein (1)～(n) of descrambling and de-spreading device 12 handles the signal of first antenna, and (n+1)～(2n) of descrambling and de-spreading device 13 handles the signal of second antenna.
Removing time delay τ kAfter, the descrambling and de-spreading device carries out conjugate complex with channel estimation value and input signal to be taken advantage of, and removes the phase rotation coefficient e that channel brings J φ k, multiply each other with scrambler a, spreading code b again, a continuous spreading factor signal is added up carry out descrambling and de-spreading, obtain the signal A behind the descrambling and de-spreading k 2S 0(1≤k≤n) or A k 2S 4(n+1≤k≤2n).This is the descrambling and de-spreading device of conventional Rake.
Two maximal ratio combiners 14,15 carry out high specific to each the road signal behind the descrambling and de-spreading respectively and merge.After through the descrambling and de-spreading device, maximal ratio combiner only needs the direct addition of the signal behind the descrambling and de-spreading is obtained the signal after high specific merges S 1 ′ = ( A 1 2 + A 2 2 + . . . + A n 2 ) S 0 Or S 2 ′ + ( A n + 1 2 + A n + 2 2 + . . . + A n + n 2 ) S 4 .
Second aerial signal that merges through high specific of separating that 16 pairs of branch storages receive separated diversity.Separate STTD diversity process and be the anti-process that the STTD diversity stipulated in the WCDMA agreement is handled, realize by signal sequence and reindexing before and after the exchange.If second aerial signal that receives is followed successively by a0, a1, a2, a3 then separates the later signal of diversity and is: a2 ,-a3 ,-a0, a1.
This process is the signal that receives S 2 ′ = ( A n + 1 2 + A n + 2 2 + . . . + A n + n 2 ) S 4 Become S 2 ′ ′ = ( B n + 1 2 + B n + 2 2 + . . . + B n + n 2 ) S 0 , B wherein N+1 2+ B N+2 2+ ...+B N+n 2Be S 0The fading channel characteristic of experience when corresponding signal transmits on second antenna.
Two fading channel estimators 21,22 utilize the channel estimation value of each paths to obtain the fading characteristic of first, second antenna transmission signal of diversity signal.Utilize the channel estimation value A of each paths of Multipath searching and channel estimator 11 outputs ke J φ k, the estimated value of winning the confidence mould square and addition, obtain the overall characteristic A of the fading channel of first aerial signal process 1 2+ A 2 2+ ...+A n 2Overall characteristic A with the fading channel of second antenna process N+1 2+ A N+2 2+ ...+A 2n 2
Two adder 17,24 difference processing signals and fading channel characteristics.Separate after the diversity second aerial signal and first aerial signal addition, obtain total received signal of not removing the fading channel characteristic:
S = ( A 1 2 + . . . + A n 2 + B n + 1 2 + . . . + B n + n 2 ) S 0 . Separate after the diversity the fading channel characteristic of second antenna experience and the fading channel characteristic addition of first antenna experience, obtain total fading channel characteristic:
A 1 2 + . . . + A n 2 + B n + 1 2 + . . . B n + n 2
Fading channel is separated the branch storage signal fadeout characteristic of second antenna transmission is separated the diversity processing.Fading channel is separated the order of branch storage according to the method exchange fading channel characteristic of the STTD diversity of stipulating in the agreement.But separate diversity and handle and different to be with signal is done, separate in the process of diversity, the amplitude of fading characteristic order of symbol correspondence before and after the exchange only, and reindexing not in fading characteristic.If the channel fading characteristic of the signal process that receives is followed successively by b 0, b 1, b 2, b 3, the channel fading characteristic of then separating the later signal process of diversity is followed successively by: b 2, b 3, b 0, b 1
This process is fading channel characteristic A N+1 2+ A N+2 2+ ...+A N+n 2Become B N+1 2+ B N+2 2+ ...+B N+n 2, B wherein N+1 2+ B N+2 2+ ...+B N+n 2Be S 0The fading channel characteristic of experience when corresponding signal transmits on second antenna.
Fading channel compensator: utilize the influence of the information removal fading channel amplitude of fading channel estimator output.This fading channel compensator is actually a divider, the total received signal after high specific is merged S = ( A 1 2 + . . . A n 2 + B n + 1 2 + . . . + B n + n 2 ) S 0 Total channel characteristic A with the fading channel estimator 1 2+ ...+A n 2+ B N+1 2+ ...+B N+n 2Be divided by, obtain removing the signal S of fading channel characteristic 0
The signal of conventional Rake output is S = ( A 1 2 + . . . + A n 2 + B n + 1 2 + . . . + B n + n 2 ) S 0 , A wherein 1 2+ A 2 2+ ...+A n 2Be the influence that the fading channel of first aerial signal process is brought, B N+1 2+ B N+2 2+ ...+B N+n 2The influence that is the fading channel of second aerial signal process is separated result after the diversity through signal.
In the present invention, fading channel estimator 21 fading channel estimators 21 are the channel estimation value A of the b road of route searching and channel estimator output ke J φ k(k ∈ [1, n]) delivery square and addition, obtain total characteristic of channel A of first aerial signal process 1 2+ A 2 2+ ...+A n 2
Same fading channel estimator 22 fading channel estimators 22 obtain total characteristic of channel A of second aerial signal process N+1 2+ A N+2 2+ ...+A 2n 2This characteristic is separated branch storage 7 through fading channel, the same fading channel characteristic of handling second aerial signal process of the processing that the fading channel characteristic of carrying in separating the diversity process according to signal can obtain obtains separating the entrained fading channel information B of signal after the diversity N+1 2+ B N+2 2+ ...+B N+n 2
The fading channel characteristic addition of two antennas, obtain the fading channel characteristic A that carries in the conventional Rake output signal 1 2+ ...+A n 2+ B N+1 2+ ...+B N+n 2
Divided by this its entrained fading channel characteristic, do not carried the received signal S of fading channel characteristic with the output result of conventional Rake 0
In route searching and channel estimator 11, obtain the timing information and the channel estimation value of each paths; Utilize timing information and channel estimation value that receive channel is carried out descrambling and de-spreading in the device (1)～(n) of descrambling and de-spreading 12, n is the path number that every transmit antennas of being received transmits; Signal behind the descrambling and de-spreading is through obtaining not removing fully first aerial signal of fading channel information behind the maximal ratio combiner.
Equally, can reach second aerial signal.Second aerial signal process separated after the STTD diversity and first aerial signal addition, obtains comprising transmitting of fading channel characteristic
S = ( A 1 2 + . . . + A n 2 + B n + 1 2 + . . . + B n + n 2 ) S 0 . This is the Rake receiver output of the conventional STTD of employing diversity.
The Rake receiver that adopts use STTD diversity of the present invention is removed the fading channel amplitude information that receives in the received signal on the basis of conventional diversity Rake receiver.
Fading channel estimator 21 and 22 obtains the fading channel amplitude of first, second root antenna respectively.Since among the STTD service time diversity, separate diversity and handle so also will do the fading channel characteristic.Different with received signal is, in separating the process of diversity, the characteristic of channel is separated the amplitude of fading characteristic order that branch storage 23 characteristics of channel are separated former and later two symbol correspondences of 23 exchanges of branch storage, and reindexing not.
Each path fading channel estimation value of second antenna also can be done earlier and separate the diversity processing, the quadratic sum that enters fading channel estimator 22 deliverys again, and it comes to the same thing.
Through second aerial signal, fading characteristic that separating diversity by adder 17 and 24 respectively with the addition of first antenna corresponding amount, obtain the characteristic of channel A of total received signal that comprises the characteristic of channel and total received signal correspondence 1 2+ ...+A n 2+ B N+1 2+ ...+B N+n 2
Obtain removing the received signal S of the characteristic of channel by channel compensator 0, be beneficial to next step channel decoding.
The method that WCDMA mobile communication system space-time emission diversity receiver for indication channel of the present invention carries out diversity reception may further comprise the steps:
A, system front end receive the baseband signal that contains Common Pilot Channel and indicating channel signal, deliver to route searching and channel estimator;
B, utilize the Common Pilot Channel signal to carry out matched filtering to carry out Multipath searching and channel estimating, obtain the position and the channel estimation value in every footpath;
C, baseband signal be by two groups of descrambling and de-spreading devices, and each descrambling and de-spreading device utilizes the position in route searching and every footpath of channel estimator output and channel estimation value to the signal removal time delay of individual paths and carry out descrambling and de-spreading, obtains the signal behind the descrambling and de-spreading; The number of described descrambling and de-spreading device is the number in the footpath that received, respectively has n.
D, by two maximal ratio combiners, respectively each the road signal behind two groups of descrambling and de-spreadings is carried out high specific and merges;
The output signal of e, second maximal ratio combiner is separated the branch storage by one, and second aerial signal through the high specific merging that receives separated diversity;
The signal of f, first maximal ratio combiner output is conciliate and is divided the signal of storage output to merge by an adder, obtains comprising the indicating channel signal of fading channel characteristic;
Further comprising the steps of:
The channel estimation value of g, route searching and channel estimator output obtains the fading characteristic of first, second antenna transmission signal of diversity signal by two fading channel estimators;
The signal fadeout characteristic of h, second antenna transmission is separated the branch storage by fading channel and is separated the diversity processing;
I, separate after the diversity the fading channel characteristic of second antenna experience and the fading channel characteristic of first antenna experience by a second adder addition, obtain total fading channel characteristic;
J, the total received signal of not removing the fading channel characteristic and total fading channel characteristic be by a fading channel compensator, and diversity reception is finished in the influence that utilizes the information of fading channel estimator output to remove the fading channel amplitude.Described fading channel compensator is a divider, and the total received signal after high specific is merged and the total channel characteristic of fading channel estimator are divided by, and obtain removing the signal of fading channel characteristic.Thereby finish the function of diversity reception.
The present invention is used for the reception of Rake to WCDMA AICH, AP-AICH, CD/CA-ICH channel, it receives anyly all can make moderate progress to the relatively more responsive signal of amplitude, and WCDMA AICH, AP-AICH, CD/CA-ICH channel receptivity are significantly improved.

Claims (6)

1, WCDMA mobile communication system space-time emission diversity receiver for indication channel comprises: a route searching and channel estimator, and first, second two groups of descrambling and de-spreading devices, first, second two maximal ratio combiners, one are separated a branch storage and an adder; Described route searching and channel estimator receive Common Pilot Channel signal and baseband signal, output to two groups of descrambling and de-spreading devices after matched filtering, each the descrambling and de-spreading device in these two groups of descrambling and de-spreading devices also receives Common Pilot Channel signal and baseband signal respectively simultaneously; Output to first maximal ratio combiner from the descrambling and de-spreading signal of first group of descrambling and de-spreading device output, after merging, output to adder; Output to after second maximal ratio combiner merges from the descrambling and de-spreading signal of second group of descrambling and de-spreading device output and to separate the branch storage, after separating diversity, output to adder; Be characterised in that: also comprise: first, second two fading channel estimators, a fading channel are separated branch storage, a second adder and a fading channel compensator; Described signal from route searching and channel estimator output is also delivered to first, second two fading channel estimators respectively; Output to second adder from the signal of first fading channel estimator output; After separating the branch storage, fading channel outputs to second adder from the signal of second fading channel estimator output; Output to output again behind the fading channel compensator respectively from the signal of adder and second adder output.
2, WCDMA mobile communication system space-time emission diversity receiver for indication channel according to claim 1 is characterized in that: the descrambling and de-spreading device in first, second two groups of descrambling and de-spreading devices respectively is the path number that is received.
3, the method that adopts the described WCDMA mobile communication system of claim 1 space-time emission diversity receiver for indication channel to carry out diversity reception may further comprise the steps:
A, system front end receive the baseband signal that contains Common Pilot Channel and indicating channel signal, deliver to route searching and channel estimator;
B, utilize the Common Pilot Channel signal to carry out matched filtering to carry out Multipath searching and channel estimating, obtain the position and the channel estimation value in every footpath;
C, baseband signal be by two groups of descrambling and de-spreading devices, and each descrambling and de-spreading device utilizes the position in route searching and every footpath of channel estimator output and channel estimation value to the signal removal time delay of individual paths and carry out descrambling and de-spreading, obtains the signal behind the descrambling and de-spreading;
D, by two maximal ratio combiners, respectively each the road signal behind two groups of descrambling and de-spreadings is carried out high specific and merges;
The output signal of e, second maximal ratio combiner is separated the branch storage by one, and second aerial signal through the high specific merging that receives separated diversity;
The signal of f, first maximal ratio combiner output is conciliate and is divided the signal of storage output to merge by an adder, obtains comprising the indicating channel signal of fading channel characteristic;
It is characterized in that, further comprising the steps of:
The channel estimation value of g, route searching and channel estimator output obtains the fading characteristic of first, second antenna transmission signal of diversity signal by two fading channel estimators;
The signal fadeout characteristic of h, second antenna transmission is separated the branch storage by fading channel and is separated the diversity processing;
I, separate after the diversity the fading channel characteristic of second antenna experience and the fading channel characteristic of first antenna experience by a second adder addition, obtain total fading channel characteristic;
J, the total received signal of not removing the fading channel characteristic and total fading channel characteristic be by a fading channel compensator, and diversity reception is finished in the influence that utilizes the information of fading channel estimator output to remove the fading channel amplitude.
4, the WCDMA mobile communication system space-time emission diversity receiver for indication channel according to claim 3 method of carrying out diversity reception is characterized in that, the number of the described descrambling and de-spreading device of step c is the number in the footpath that received.
5, the WCDMA mobile communication system space-time emission diversity receiver for indication channel according to claim 3 method of carrying out diversity reception is characterized in that, respectively is the path number that is received in the described two groups of descrambling and de-spreading devices of step c.
6, the WCDMA mobile communication system space-time emission diversity receiver for indication channel according to claim 3 method of carrying out diversity reception, it is characterized in that, the described fading channel compensator of step j is a divider, the total received signal after the high specific merging and the total channel characteristic of fading channel estimator are divided by, obtain removing the signal of fading channel characteristic.
CN 02136069 2002-07-17 2002-07-17 Space-time emission diversity receiver for indication channel of movable WCDMA communication system and its receiving method Expired - Lifetime CN1212711C (en)

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US7680083B2 (en) * 2005-07-28 2010-03-16 Broadcom Corporation Rake receiver architecture within a WCDMA terminal
CN101295996B (en) * 2007-04-28 2011-10-26 凌阳科技股份有限公司 Instant channel estimating system
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