CN101707493B - Multipath signal carrier coherent demodulating Rake receiver - Google Patents
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- CN101707493B CN101707493B CN200910034231A CN200910034231A CN101707493B CN 101707493 B CN101707493 B CN 101707493B CN 200910034231 A CN200910034231 A CN 200910034231A CN 200910034231 A CN200910034231 A CN 200910034231A CN 101707493 B CN101707493 B CN 101707493B
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Abstract
The invention relates to a multipath signal carrier coherent demodulating Rake receiver which can be used for the code-division multiple-access receiving of mobile communication. The traditional Rake receiver can introduce coherent demodulating loss according to a multipath receiving signal expression and a traditional Rake receiver expression. A method and a device for realizing the multipath signal carrier coherent demodulating Rake receiver are provided by a multipath receiving signal carrier separating and coherent demodulating expression and an inverse modulation recovering multipath receiving signal local coherent carrier expression. The device recovers three paths of independent local coherent carriers for the carrier separation and demodulation of a multipath signal, delays two paths of signals by two delayers to achieve the synchronization of three paths of signals and descrambles the three paths of signals after combination. The invention eliminates the influence of a coherent demodulating loss factor cos theta and improves the downlink power utilization ratio of a CDMA system. The invention dispreads all paths of signals after being combined, thereby simplifying a circuit.
Description
Technical field
The present invention relates to a kind of CDMA multipath signal carrier coherent demodulating Rake (RAKE) receiver; Can be used for the cdma system down link signal receives; Realize the merging of multipath collection of letters energy expeditiously; Can increase substantially the power utilization and the receiver signal to noise ratio of down channel multipath transmisstion signal, belong to the mobile communication technology field.
Background technology
Traditional rake receiver (CLRAKE) is the element of CDMA receiver.Utilize the CLRAKE receiver can realize the separation of receiving terminal multipath signal in the mobile communication wireless communication environments, time delay adjustment and three basic processes of stack combinations; Thereby realize the diversity reception of multipath transmisstion energy, improve the collection of letters signal to noise ratio of receiver and a power utilization of base station.Yet used CLRAKE receiver is all realized on base band, the influence of phase difference between the multipath signal carrier of not considering to receive.In the realization of CDMA downstream signal receiver, should adopt the coherent demodulation mode.Owing to have phase difference, the road coherent carrier C that recovers in the receiver between the multipath signal carrier of receiving
1L(t)=cosw
1LT can only with a footpath collection of letters carrier wave S
1(t)=S
1Cosw
1T keeps synchronously, and the phase difference θ between these two signals is 0, can realize coherent demodulation, but can cause in the demodulation of collecting mail number in other two footpath, introducing their collection of letters carrier wave and C separately
1L(t) relevant restituted signal amplitude loss, change in polarity and the interference of phase difference θ.As other footpath collection of letters carrier wave S
2(t)=S
2Cosw
2T and C
1LWhen (t) having phase difference θ, but the demodulated signal simple table is shown S
2Cos θ, obviously phase difference θ will influence the polarity and the amplitude of demodulated signal.This phase difference loss can make the power utilization of multipath signal decline to a great extent, and can cos θ be defined as the coherent demodulation fissipation factor.The CLRAKE receiver will utilize training sequence or other channel estimation methods to estimate the polarity of cos θ, in order to avoid the polarity inversion of demodulated signal, but is unable to estimate the value of cos θ, therefore can not eliminate its influence.
Summary of the invention:
Technical problem: traditional rake receiver (CLRAKE) will cause the power utilization of multipath signal to decline to a great extent owing to there is the phase difference θ that can't accurately estimate between the carrier wave of different paths.To this defective, the present invention provides a kind of and realizes that on carrier wave multipath separates, and multipath signal is realized the novel Rake receiver (CORAKE) of carrier coherent demodulating respectively.Each the footpath signal reception all be coherent demodulation, three the footpath local carriers be 0 with corresponding three tunnel collection of letters carrier phase difference θ respectively; Can not introduce the influence of coherent demodulation fissipation factor cos θ; The phase difference of having eliminated each footpath intercarrier has improved the power utilization when the cdma system downlink receiver is received multipath signal greatly to receiving Effect on Performance.
Technical scheme: a plurality of local coherent carrier that CORAKE receiver utilization of the present invention recovers realizes that with coherent demodulator multipath separates and the coherent demodulation reception on carrier wave; Avoided the CLRAKE receiver since each directly the number of collection of letters carrier wave have phase difference; Can introduce the influence of coherent demodulation fissipation factor cos θ, cause the not good enough problem of receiver performance.Multipath signal carrier coherent demodulating Rake receiver comprises three the QAM coherent demodulator, the 2nd QAM coherent demodulator, the 3rd QAM coherent demodulators that are used for the three footpath collection of letters number separation and coherent reception; Be used to adjust first delayer, second delayer of multidiameter delay; The first adder that is used for the three footpath signal stacks of I road; Be used for the second adder of Q road three footpath signal stacks, be used for I road first multiplier of combined signal descrambling, be used for Q road second multiplier of combined signal descrambling; Comprise the input signal S that collects mail number in three footpaths
AD(t) send into a QAM coherent demodulator, the 2nd QAM coherent demodulator, the 3rd QAM coherent demodulator respectively, and the local coherent carrier cosw that utilizes three cover carrier recovery circuits to recover
1LT ,-sinw
1LT, cosw
2L(t) ,-sinw
2L(t), cosw
3L(t) and-sinw
3L(t) carry out coherent demodulation, the I that a said QAM coherent demodulator demodulates
T1, Q
T1The road signal connects the input of first delayer, the I that said the 2nd QAM coherent demodulator demodulates
T2, Q
T2The road signal connects the input of second delayer; First delay control signal connects the signal input end of said first delayer; Second delay control signal connects the signal input end of said second delayer, the I of a said QAM coherent demodulator, the 2nd QAM coherent demodulator
T1, I
T2Road output warp first delayer, second delayer meet 2 road inputs of first adder, the Q of a said QAM coherent demodulator, the 2nd QAM coherent demodulator respectively
T1, Q
T2Road output warp first delayer, second delayer meet 2 road inputs of second adder, the output I of said the 3rd QAM coherent demodulator respectively
T3Connect another road input of said first adder, the output Q of said the 3rd QAM coherent demodulator
T3Connect another road input of said second adder; The output of said first adder connects descrambling code first multiplier; The output of said second adder connects descrambling code second multiplier, and the first local random sequence and the second local random sequence are imported the descrambling code that said first multiplier and second multiplier carry out I road, Q road combined signal respectively respectively.
Saidly be used to recover local coherent carrier cosw
1LT and-sinw
1LThe cover carrier recovery circuit of t comprises the first contrary modulation multiplier, the second contrary modulation multiplier, first narrow band filter circuit that is used to extract local coherent carrier, second narrow band filter circuit and first regulating circuit mutually that is used to adjust the first local random sequence and the second local random sequence phase place that is used for recovering from multipath signal the local coherent carrier of a certain footpath signal; Multipath pilot signal S
PilotConnect the input of first narrow band filter circuit and second narrow band filter circuit respectively through the first contrary modulation multiplier, the second contrary modulation multiplier; The output of said first narrow band filter circuit connects the said first contrary input of modulating multiplier through phase regulating circuit, and the output of said second narrow band filter circuit connects the input of the said second contrary modulation multiplier through phase regulating circuit.
Beneficial effect: the present invention recovers each directly local coherent carrier of the number of collection of letters earlier; Can realize the separation of the footpath of three on the carrier wave then; And realize the coherent demodulation of collecting mail number in three footpaths respectively; The reception of each footpath signal can not introduced the influence of coherent demodulation fissipation factor cos θ, has eliminated each footpath collections of letters carrier phase difference to receiving Effect on Performance, has improved the power utilization of the descending multipath collection of letters number of cdma system greatly.And the present invention carries out descrambling after each footpath signal is merged again, simplified circuit.
Description of drawings
Fig. 1 is one a tunnel local coherent carrier restore circuit of CORAKE receiver.Comprising the first contrary modulation multiplier M that is used for recovering the local coherent carrier of a certain footpath signal from multipath signal
11, the second contrary modulation multiplier M
12, be used to extract a NBPF of local coherent carrier
1(narrow band filter) circuit 13 and the 2nd NBPF
1Circuit 15 is used to adjust local scrambler PN
ILAnd PN
QLFirst phase regulating circuit 14 of phase place.
Fig. 2 is the schematic block circuit diagram of cdma system 3 footpath collection of letters coherent demodulating Rake receiver CORAKE.This equipment comprises that three are used for three footpaths and collect mail and number to separate and the QAM of coherent reception first coherent demodulator 21, second coherent demodulator 22, the dried demodulator 23 of third phase; Be used to adjust first delayer 24, second delayer 25 of multidiameter delay, be used for the first adder M of I road three footpath signals stacks
26, be used for the second adder M that Q road three footpath signals superpose
27, be used for the I road first multiplier M of combined signal descrambling
28, be used for the Q road second multiplier M of combined signal descrambling
29
Embodiment
Fig. 1 provides the local coherent carrier restore circuit of the multipath theory diagram of CORAKE receiver of the present invention.
This equipment comprises the first contrary modulation multiplier M that is used for recovering from multipath signal the local coherent carrier of a certain footpath signal
11, the second contrary modulation multiplier M
12, be used to extract first narrow band filter circuit 13 and second narrow band filter circuit 15 of local coherent carrier, be used to adjust the first local random sequence PN
ILWith the second local random sequence PN
QLFirst phase regulating circuit 14 of phase place; Multipath pilot signal S
PilotConnect the input of first narrow band filter circuit and second narrow band filter circuit respectively through the first contrary modulation multiplier, the second contrary modulation multiplier; The output of said first narrow band filter circuit connects the said first contrary input of modulating multiplier through phase regulating circuit, and the output of second narrow band filter circuit connects the input of the said second contrary modulation multiplier through phase regulating circuit.
The expression formula of a certain footpath down-bound pilot frequency signal (Pilot) is following among Fig. 1:
S
pilot＝PN
I?cos?w
1t-PN
Q?sin?w
1t (1)
PN wherein
I=± 1, PN
QExpression formula and PN
IIdentical, but PN
QAnd PN
IBe two different short PN sequences.Local two short PN sequence PN that produce
ILAnd PN
QLAfter the phase place adjustment, get PN
I1LAnd PN
Q1L, this two-way sequence and collection of letters S
PilotIn PN
IAnd PN
QSynchronously, by
S
pilot×PN
I1L＝cosw
1t-PN
I1L?PN
Q1sinw
1t (2)
Can find out and receive a certain footpath signal carrier cosw
1T is resumed, through the first narrow band filter (NBPF
1)The local coherent carrier cosw that can be used for a QAM coherent demodulator among Fig. 2 after the extraction
1LT.In like manner can obtain-sinw
1LT.
NBPF
1Output can be used as PN
ILAnd PN
QLThe control signal of first phase regulating circuit (14) is worked as cosw
1LWhen the t signal is obtained amplitude peak, can think PN
I1LWith S
PilotIn PN
ISynchronously.Above-mentioned conclusion also can be used for PN
Q1LAnd PN
Q
Three footpath collection of letters carrier coherent demodulating receivers will re-use 2 covers and be similar to the local coherent carrier restore circuit among Fig. 1, just change the phase regulating circuit output in the other 2 cover circuit into PN respectively
I2LAnd PN
Q2L, PN
I3LAnd PN
Q3LThis moment, the output of these two local coherent carrier restore circuits was respectively cosw
2L(t) ,-sinw
2L(t), cosw
3L(t) and-sinw
3L(t).
Fig. 2 provides the schematic block circuit diagram of 3 footpath collection of letters carrier coherent demodulating Rake receivers (CORAKE).This receiver comprises that three are used for three footpaths and collect mail and number to separate and a QAM coherent demodulator 21, the 2nd QAM of coherent reception
Coherent demodulator 22, the 3rd QAM coherent demodulator 23 are used to adjust first delayer 24, second delayer 25 of multidiameter delay, are used for the first adder M of I road three footpath signals stacks
26, be used for the second adder M that Q road three footpath signals superpose
27, be used for the I road first multiplier M of combined signal descrambling
28, be used for the Q road second multiplier M of combined signal descrambling
29Comprise the input signal S that collects mail number in three footpaths
AD(t) send into a QAM coherent demodulator, the 2nd QAM coherent demodulator, the 3rd QAM coherent demodulator respectively, and the local coherent carrier that utilizes three cover carrier recovery circuits to recover carries out coherent demodulation, the I that a said QAM coherent demodulator 21 demodulates
T1, Q
T1The road signal connects the input of first delayer 24, the I that said the 2nd QAM coherent demodulator 22 demodulates
T2, Q
T2The road signal connects the input of second delayer 25, the first delay control signal C
D1Connect the signal input end of said first delayer 24, the second delay control signal C
D2Connect the signal input end of said second delayer 25, the I of a said QAM coherent demodulator 21, the 2nd QAM coherent demodulator 22
T1, I
T2Road output meets first adder M respectively through first delayer 24, second delayer 25
262 road inputs, the Q of a said QAM coherent demodulator 21, the 2nd QAM coherent demodulator 22
T1, Q
T2Road output meets second adder M respectively through first delayer 24, second delayer 25
272 road inputs, the output I of said the 3rd QAM coherent demodulator 23
T3Meet said first adder M
26Another road input, the output Q of said the 3rd QAM coherent demodulator 23
T3Meet said second adder M
27Another road input, said first adder M
26Output meet the descrambling code first multiplier M
28, said second adder M
27Output meet the descrambling code second multiplier M
29, the first local random sequence PN
I3LWith the second local random sequence PN
Q3LImport the said first multiplier M respectively
28With the second multiplier M
29Carry out the descrambling code of I road, Q road combined signal respectively.
The local coherent carrier of among Fig. 26 tunnel respectively with three footpath collections of letters carrier waves with the frequency homophase, can provide according to Fig. 2:
I
t1＝I
1+I
2cosθ
2+I
3cosθ
3+Q
2sinθ
2+Q
3sinθ
3 (3)
Q
t1＝Q
1+Q
2cosθ
2+Q
3cosθ
3-I
2sinθ
2-I
3sinθ
3 (4)
I
t2＝I
2+I
1cosθ
1+I
3cosθ
3+Q
1sinθ
1+Q
3sinθ
3 (5)
Q
t2＝Q
2+Q
1cosθ
1+Q
3cosθ
3-I
1sinθ
1-I
3sinθ
3 (6)
I
t3＝I
3+I
1cosθ
1+I
2cosθ
2+Q
1sinθ
1+Q
2sinθ
2 (7)
Q
t3＝Q
3+Q
1cosθ
1+Q
2cosθ
2-I
1sinθ
1-I
2sinθ
2 (8)
I wherein
1, I
2And I
3Be respectively the three footpath collections of letters number signal output, Q through the demodulated I road
2And Q
3Be respectively the phase difference of the 2nd and the 3rd footpath collection of letters carrier wave and the 1st footpath collection of letters intercarrier.
Because can be with the PN that obtains in the three footpath collection of letters coherent carrier restore circuits
I1L, PN
I2LAnd PN
I3LJudge I
T1And I
T2Therefore due time delay can accomplish the RAKE additive process before despreading, use PN thereafter again
I3LCarry out despreading.Can use similar method to derive the RAKE receiving unit on Q road,, omit here for avoiding repetition.
Can find out from formula (3)～(8), adopt 3 footpath collections of letters coherent demodulation RAKE receivers after, can realize 3 footpaths collect mail separation and coherent demodulation number on carrier wave, can avoid in traditional RAKE receiver owing to non-coherent demodulation fissipation factor cos θ
2The mis-behave that causes etc. parameter.
Embodiment one
Present embodiment is to receive from three footpaths to recover local coherent carrier and PN sequence the pilot signal.The local coherent carrier restore circuit of Fig. 1 comprises the first contrary modulation multiplier M that is used for from the multipath collection of letters number local coherent carrier of a certain footpath of recovery signal
11, the first contrary modulation multiplier M
12, be used to extract a NBPF of local coherent carrier
1(narrow band filter) circuit 13 and the 2nd NBPF
1Circuit 15 is used to adjust the first local random sequence PN
IThe L and the second local random sequence PN
QLFirst phase regulating circuit 14 of phase place.
Multipath is received pilot signal S
PilotMeet a NBPF respectively through the first contrary modulation multiplier and the second contrary modulation multiplier
1Circuit and the 2nd NBPF
1The input of circuit, a said NBPF
1Output warp first phase regulator of circuit meets the input of said first multiplier, said the 2nd NBPF
1The output of circuit connects the input of said second multiplier through phase regulating circuit.The one NBPF
1The output of circuit can be used as the local scrambler PN of adjustment
ILAnd PN
QLThe control signal of phase regulating circuit, as local coherent carrier cosw
1LWhen the t signal is obtained amplitude peak, can think PN
I1LWith S
PilotIn PN
ISynchronously, and this moment exalted carrier cosw
1LT and S
PilotIn certain the footpath signal the carrier wave homophase.
Embodiment two
Present embodiment is to carry out the carrier separation that multipath collects mail number and the RAKE reception of coherent demodulation.3 footpath collections of letters carrier coherent demodulating RAKE receiver (CORAKE) circuit of Fig. 2 comprise that three are used for three directly a QAM coherent demodulator 21, the 2nd QAM coherent demodulator 22, the 3rd QAM coherent demodulators 23 of collection of letters carrier separation and coherent reception; Be used to adjust first delayer 24, second delayer 25 of multidiameter delay, suppose the I road output signal I of the 3rd QAM coherent demodulator here
T3With Q road output signal Q
T3Time delay maximum.The first adder M that is used for the three footpath signal stacks of I road
26, be used for the second adder M that Q road three footpath signals superpose
27, be used for the I road first multiplier M of combined signal descrambling
28, be used for the Q road second multiplier M of combined signal descrambling
29
Comprise the input signal S that multipath is collected mail number
AD(t) the local coherent carrier of sending into a QAM coherent demodulator, the 2nd QAM coherent demodulator, the 3rd QAM coherent demodulator respectively and utilizing three cover coherent carrier restore circuits to recover carries out multipath signal to be separated and coherent demodulation.The I that a said QAM coherent demodulator 21 demodulates
T1, Q
T1The road signal connects the input of first delayer 24, the I that said the 2nd QAM coherent demodulator 22 demodulates
T2, Q
T2The road signal connects the input of second delayer 25, the first delay control signal C
D1Connect the signal input end of said first delayer 24, the second delay control signal C
D2Connect the signal input end of said second delayer 25, the I of a said QAM coherent demodulator 21, the 2nd QAM coherent demodulator 22
T1, I
T2Road output meets first adder M respectively through first delayer 24, second delayer 25
262 road inputs, the Q of a said QAM coherent demodulator 21, the 2nd QAM coherent demodulator 22
T1, Q
T2Road output meets second adder M respectively through first delayer 24, second delayer 25
272 road inputs, the output I of said the 3rd QAM coherent demodulator 23
T3Meet said first adder M
26Another road input, the output Q of said the 3rd QAM coherent demodulator 23
T3Meet said second adder M
27Another road input, said first adder M
26Output meet the descrambling code first multiplier M
28, said second adder M
27Output meet the descrambling code second multiplier M
29, the first local random sequence PN
I3LWith the second local random sequence PN
Q3LImport the said first multiplier M respectively
28With the second multiplier M
29Carry out the descrambling code of I road, Q road combined signal respectively.Separation and carrier coherent demodulating RAKE that above process has been accomplished multipath signal receive.
Except that the foregoing description, the present invention can also have other execution mode, such as receiving more than three receipts multipath signal carrier coherent demodulating RAKE etc.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of requirement of the present invention.
Claims (1)
1. multipath signal carrier coherent demodulating Rake receiver; It is characterized in that: this receiver comprises three the QAM coherent demodulator (21), the 2nd QAM coherent demodulator (22), the 3rd QAM coherent demodulators (23) that are used for the three footpath collection of letters number separation and coherent reception; Be used to adjust first delayer (24), second delayer (25) of multidiameter delay, be used for the first adder (M of I road three footpath signal stacks
26), be used for the second adder (M that Q road three footpath signals superpose
27), be used for the I road first multiplier (M of combined signal descrambling
28), be used for the Q road second multiplier (M of combined signal descrambling
29); Comprise the input signal S that collects mail number in three footpaths
AD(t) send into a QAM coherent demodulator, the 2nd QAM coherent demodulator, the 3rd QAM coherent demodulator respectively, and the local coherent carrier cos ω that utilizes three cover carrier recovery circuits to recover
1LT ,-sin ω
1LT, cos ω
2LT ,-sin ω
2LT, cos ω
3LT and-sin ω
3LT carries out coherent demodulation, the I that a said QAM coherent demodulator (21) demodulates
T1, Q
T1The road signal connects the input of first delayer (24), the I that said the 2nd QAM coherent demodulator (22) demodulates
T2, Q
T2The road signal connects the input of second delayer (25), the first delay control signal (C
D1) connect the signal input end of said first delayer (24), the second delay control signal (C
D2) connect the signal input end of said second delayer (25), the I of a said QAM coherent demodulator (21), the 2nd QAM coherent demodulator (22)
T1, I
T2Road output meets first adder (M respectively through first delayer (24), second delayer (25)
26) 2 road inputs, the Q of a said QAM coherent demodulator (21), the 2nd QAM coherent demodulator (22)
T1, Q
T2Road output meets second adder (M respectively through first delayer (24), second delayer (25)
27) 2 road inputs, the output I of said the 3rd QAM coherent demodulator 23
T3Meet said first adder (M
26) another road input, the output Q of said the 3rd QAM coherent demodulator (23)
T3Meet said second adder (M
27) another road input, said first adder (M
26) output meet the descrambling code first multiplier (M
28), said second adder (M
27) output meet the descrambling code second multiplier (M
29), the first local random sequence (PN
I3L) and the second local random sequence (PN
Q3L) import the said first multiplier (M respectively
28) and the second multiplier (M
29) carry out the descrambling code of I road, Q road combined signal respectively;
Saidly be used to recover local coherent carrier cos ω
1LT and-sin ω
1LThe cover carrier recovery circuit of t comprises the first contrary modulation multiplier (M that is used for recovering from multipath signal the local coherent carrier of a certain footpath signal
11), the second contrary modulation multiplier (M
12), be used to extract first narrow band filter circuit (13), second narrow band filter circuit (15) of local coherent carrier and be used to adjust local scrambler PN
ILAnd PN
QLFirst phase regulating circuit (14) of phase place; Multipath pilot signal S
PilotThrough the first contrary modulation multiplier (M
11), the second contrary modulation multiplier (M
12) connecing the input of first narrow band filter circuit (13) and second narrow band filter circuit (15) respectively, the output of said first narrow band filter circuit (13) meets the said first contrary modulation multiplier (M through first phase regulating circuit (14)
11) input, the output of said second narrow band filter circuit (15) meets the said second contrary modulation multiplier (M through first phase regulating circuit (14)
12) input.
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|---|---|---|---|
| CN200910034231A CN101707493B (en) | 2009-08-26 | 2009-08-26 | Multipath signal carrier coherent demodulating Rake receiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910034231A CN101707493B (en) | 2009-08-26 | 2009-08-26 | Multipath signal carrier coherent demodulating Rake receiver |
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| CN101707493B true CN101707493B (en) | 2012-09-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324522A (en) * | 1998-08-21 | 2001-11-28 | 诺基亚移动电话有限公司 | Adaptive receiver for multipach propagation in a CDMA communication system |
| CN101072392A (en) * | 2007-06-19 | 2007-11-14 | 南京邮电大学 | CDMA-TDMA intelligent antenna transceiving method and device |
-
2009
- 2009-08-26 CN CN200910034231A patent/CN101707493B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324522A (en) * | 1998-08-21 | 2001-11-28 | 诺基亚移动电话有限公司 | Adaptive receiver for multipach propagation in a CDMA communication system |
| CN101072392A (en) * | 2007-06-19 | 2007-11-14 | 南京邮电大学 | CDMA-TDMA intelligent antenna transceiving method and device |
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| CN101707493A (en) | 2010-05-12 |
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