CN100518152C - Finger channel estimator system - Google Patents
Finger channel estimator system Download PDFInfo
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- CN100518152C CN100518152C CNB2005101027801A CN200510102780A CN100518152C CN 100518152 C CN100518152 C CN 100518152C CN B2005101027801 A CNB2005101027801 A CN B2005101027801A CN 200510102780 A CN200510102780 A CN 200510102780A CN 100518152 C CN100518152 C CN 100518152C
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Abstract
A Finger channel estimator consists of dephasing rotary synthesizer for combining output results of all Finger demodulation units in each code channel after demodulation output is weighted , index window IIR filter for filtering pilot I / Q symbol series with time synchronization and Finger random series descrambling unit for demodulation out pilot I / Q symbol series with time synchronization and for obtaining weighted coefficient in order to carry out weighting for each orthogonal code channel data series .
Description
Technical field:
The present invention proposes a kind of finger peak (Finger) channel estimator, can be used for realizing high integration, high accuracy, high sensitivity, high reliability, anti-interference, Embedded Rake receiver.The patented technology that the present invention proposes belongs to moving communicating field.
Background technology:
RAKE diversity receiving technology (being commonly called as path diversity) is the key technology of the CDMA mobile communication system of fdd mode and tdd mode.The basic principle of RAKE receiver is exactly that those amplitudes are obviously taken out greater than the multipath component of noise background, it is delayed time and phasing, make it at a time to align, and merge by certain rule, become vector and merge into the algebraically summation, effectively utilize multipath component, improve the effect of rake.
General RAKE receiver by searcher (Searcher), refer to that peak (Finger) demodulating unit, 3 modules of combiner (Combiner) form.Searcher is finished route searching, and cardinal principle is to utilize the auto-correlation and the their cross correlation of sign indicating number.Despreading, the orthogonal channel demodulation of signal finished at the finger peak, refers to that the number at peak (Finger) has determined the number of path that the orthogonal channel demodulation can be used, and RAKE receiver of cdma base station system is made up of 4 finger peaks usually, and travelling carriage is made up of 3 finger peaks.Combiner is finished the merging of the signal of a plurality of demodulator outputs and is handled, and general merge algorithm has selecting type addition merging, equal gain combining, high specific to merge 3 kinds.Signal after the merging outputs to the channel-decoding unit, carries out channel-decoding and handles.
In the Rake receiver, include a plurality of fingers peak demodulating unit.Each refers to peak demodulating unit processing and demodulates the signal that receives from a transmission paths.Because the intensity difference of the signal that receives with the path never is so the Rake receiver when the data sequence to all finger peak demodulation output merges, need be done different weightings to each demodulation output that refers to the peak.Thereby, need do channel estimating to each path that refers to that the peak receives, obtain Rake receiver required weight coefficient when merging this demodulation that refers to peak output.
The present invention proposes a kind of finger peak channel estimator, use this to refer to the peak channel estimator, each refers to the required weight coefficient of demodulation output at peak can to calculate merging, thereby realizes complete function, high integration, high accuracy, high sensitivity, high reliability, anti-interference, Embedded finger peak demodulator and Rake receiver.
Summary of the invention:
Purpose of design: the present invention proposes a kind of novel, high reliability, low complex degree, jamproof finger peak channel estimator.The time synchronized pilot tone I/Q symbol sebolic addressing of this finger peak channel estimator utilization from referring to that random sequence descrambling unit, peak demodulates obtains weight coefficient that each quadrature code channel (control information transmission and the business information) data sequence that refers to peak demodulation output (recovering) is weighted by time synchronized pilot tone I/Q symbol sebolic addressing being done first order pole IIR filtering.After process refers to that to each weighting is finished in peak demodulation output (control information that recovers and business information data sequence), for each code channel, the output result (the orthogonal dispreading data sequence after the weighting) that relevant all refer to the peak demodulating unit this code channel go merge in the phase place rotation combiner.
Design: the finger peak channel estimator that the present invention proposes and the block diagram of interface and structure thereof, shown in accompanying drawing one.
According to the present invention, each refers to the finger peak channel estimator in the peak (demodulating unit), by constituting with lower member:
(1) first order pole IIR (infinite impulse response) filter;
(2) forgetting factor generator;
The basic principle of this channel estimator is that utilization refers to the time synchronized pilot tone I/Q symbol sebolic addressing that the random sequence descrambling module at peak demodulates, and obtains the output result of channel estimating, promptly refers to the weight coefficient of peak demodulation output.
This channel estimator and referring between the peak random sequence descrambling module, and and each code channel orthogonal dispreading module between have interface.It from and refer to that the interface between the peak random sequence descrambling module obtains to refer to the time synchronized pilot tone I/Q symbol sebolic addressing that random sequence descrambling unit, peak demodulates.Between it and each code channel orthogonal dispreading module then is the generation effect (being weighted by the orthogonal dispreading dateout sequence of vector dot product device to each code channel orthogonal dispreading module) by a vector dot product device.
Original I/Q data from the Analog Baseband system are owed sampler by integration, finish integration and owe sampling.Integration is owed sampler and is finished the short period integration, and the result that integration draws is constituted new sequence, because new sequence is lower than the speed of original I/Q sequence, thereby is referred to as to owe sampled sequence.Integration is owed the synchronous random sequence descrambler of output time of delivery (TOD) of sampler.The randomization sign indicating number that time synchronized random sequence descrambler utilizes randomization sign indicating number sequencer to produce finishes that the random sequence descrambling is carried out in the output of owing sampler to integration and integration is collected, and demodulates time synchronized pilot tone I/Q symbol sebolic addressing.
The time synchronized pilot tone I/Q symbol sebolic addressing of time synchronized random sequence descrambler output is divided into two-way, and one the tunnel sends into finger peak channel estimator, is used in reference to the peak channel estimating.The vector dot product device is delivered on another road, utilizes to refer to that the output result of peak channel estimator does weighted.
Refer to that the peak channel estimator is by constituting with lower member:
(1) first order pole IIR (infinite impulse response) filter;
(2) forgetting factor generator.
After synchronizing pilot I/Q symbol sebolic addressing is sent into and is referred to the peak channel estimator, through the filtering of first order pole iir filter.Filtered synchronizing pilot I/Q symbol sebolic addressing is used for the data that refer to each quadrature code channel despreading output of peak demodulating unit are weighted as the output that refers to the peak channel estimator.Usually, filtered synchronizing pilot I/Q symbol sebolic addressing is than the time of 3 frequency pilot signs of data sequence (control information that recovers and business information data sequence) hysteresis of the quadrature code channel despreading output that is weighted.
The above is meant the basic principle and the course of work of peak channel estimator, below sets forth the relevant algorithm that refers to that the peak channel estimator uses.
1. refer to peak indication (referring to the output of peak control unit) B
Nf(n)
B
Nf(n)=1, represent that this refers to that the peak is the finger peak that a new search arrives, and need reinitialize channel estimator;
B
Nf(n)=0, represent that this refers to that the peak is a finger peak that has searched before, does not need to reinitialize channel estimator.
2. synchronizing pilot I/Q symbol sebolic addressing carries out filtering through first order pole window index iir filter
Synchronizing pilot I/Q symbol sebolic addressing after being input to finger peak channel estimator, carries out filtering by first order pole IIR (infinite impulse response) filter.
(1) if B
Nf(n)=0, carry out filtering by following formula:
I
filtered-pilot(k)＝(1-β)·I
filtered-pilot(k-1)+β·I
pilot(k)(EQ1)
Q
filtered-pilot(k)＝(1-β)·Q
filtered-pilot(k-1)+β·Q
pilot(k)(EQ2)
(2) if B
Nf(n)=1, then press following formula filtering:
I
filtered-pilot(k)＝I
pilot(k) (EQ3)
Q
filtered-pilot(k)＝Q
pilot(k) (EQ4)
In the formula, I
Pilot(k) expression synchronizing pilot I/Q symbol sebolic addressing is at the I of moment k (homophase) data value, Q
Pilot(k) expression synchronizing pilot I/Q symbol sebolic addressing is at the Q of moment k (quadrature phase) data value, I
Filtered-pilot(k) and Q
Filtered-pilot(k) then be I respectively
Pilot(k) and Q
Pilot(k) value that after the filtering of process first order pole iir filter, obtains.β is the forgetting factor of first order pole iir filter.
3. the data sequence to quadrature code channel despreading output is weighted
Filtered synchronizing pilot I/Q symbol sebolic addressing is used for the data (control information that recovers and business information data sequence) that refer to each quadrature code channel despreading output of peak demodulating unit are weighted as the output that refers to the peak channel estimator.Usually, filtered synchronizing pilot I/Q symbol sebolic addressing promptly was weighted with following formula than the time of 3 frequency pilot signs of data sequence hysteresis of the quadrature code channel despreading output that is weighted:
I
weighed-traffic(k)＝I
traffic(k)·I
filtered-pilot(k-3) (EQ5)
Q
weighed-traffic(k)＝Q
traffic(k)·Q
filtered-pilot(k-3) (EQ6)
In the formula, I
Traffic(k) data sequence of a certain orthogonal code channel despreading output of expression is at the I of moment k (homophase) data value, Q
Traffic(k) represent that the data sequence of this quadrature code channel despreading output is at the Q of moment k (quadrature phase) data value, I
Weighed-traffic(k) and Q
Weighed-traffic(k) then be I respectively
Traffic(k) and Q
Pilot(k) in value through obtaining after the weighting.I
Weighed-traffic(k) and Q
Weighed-traffic(k) being used to the phase place rotation merges.
Finger peak channel estimator in the Rake receiver that the present invention proposes, the time synchronized pilot tone I/Q symbol sebolic addressing of utilization from referring to that random sequence descrambling unit, peak demodulates obtains weight coefficient that each quadrature code channel (control information transmission and the business information) data sequence that refers to peak demodulation output (recovering) is weighted by time synchronized pilot tone I/Q symbol sebolic addressing being done first order pole IIR filtering.After process refers to that to each weighting is finished in peak demodulation output (control information that recovers and business information data sequence), for each code channel, the output result (the orthogonal dispreading data sequence after the weighting) that relevant all refer to the peak demodulating unit this code channel go merge in the phase place rotation combiner.In referring to the peak channel estimator, adopt the window index iir filter that time synchronized pilot tone I/Q symbol sebolic addressing is carried out filtering, improved the accuracy and the reliability that refer to the peak channel estimating.This refers to that the peak channel estimator is simple in structure, complexity is little, computing cost is low, channel estimation reliability is high, is easy to realization, practical, is very suitable for being embedded in the communication chip and realizes with hardware mode, can be directly commercial.
Description of drawings:
Fig. 1 is the interface and the structured flowchart of novel, the high reliability that proposes of the present invention, low complex degree, jamproof finger peak channel estimator.
According to the present invention, each refers to the finger peak channel estimator in the peak (demodulating unit), by consisting of with lower member:
(1) first order pole IIR (infinite impulse response) wave filter;
(2) forgetting factor generator;
This channel estimator and referring between the peak random sequence descrambling module, and and each code channel orthogonal dispreading module between have interface. It from and refer to that the interface between the peak random sequence descrambling module obtains to refer to the time synchronized pilot tone that random sequence descrambling unit, peak demodulates The I/Q symbol sebolic addressing. Between it and each code channel orthogonal dispreading module then be the generation effect by a vector dot product device (by The vector dot product device is weighted the orthogonal dispreading output data sequence of each code channel orthogonal dispreading module).
The function of said units and each other relation, all elaboration explanation in summary of the invention.
Embodiment:
Embodiment: with reference to accompanying drawing 1.Accompanying drawing 1 is novel, high reliability, low complex degree, the jamproof finger peak channel estimator block diagram that the present invention proposes.
According to the present invention, each refers to the finger peak channel estimator in the peak (demodulating unit), by constituting with lower member:
(1) first order pole IIR (infinite impulse response) filter;
(2) forgetting factor generator;
The basic principle of this channel estimator is that utilization refers to the time synchronized pilot tone I/Q symbol sebolic addressing that the random sequence descrambling module at peak demodulates, and obtains the output result of channel estimating, promptly refers to the weight coefficient of peak demodulation output.
Between this channel estimator and the finger peak random sequence descrambling module, and there is interface between each code channel orthogonal dispreading module.It from and refer to that the interface between the peak random sequence descrambling module obtains to refer to the time synchronized pilot tone I/Q symbol sebolic addressing that random sequence descrambling unit, peak demodulates.Between it and each code channel orthogonal dispreading module then is the generation effect (being weighted by the orthogonal dispreading dateout sequence of vector dot product device to each code channel orthogonal dispreading module) by a vector dot product device.
Original I/Q data from the Analog Baseband system are owed sampler by integration, finish integration and owe sampling.Integration is owed the synchronous random sequence descrambler of output time of delivery (TOD) of sampler.The randomization sign indicating number that time synchronized random sequence descrambler utilizes randomization sign indicating number sequencer to produce finishes that the random sequence descrambling is carried out in the output of owing sampler to integration and integration is collected, and demodulates time synchronized pilot tone I/Q symbol sebolic addressing.
The time synchronized pilot tone I/Q symbol sebolic addressing of time synchronized random sequence descrambler output is divided into two-way, and one the tunnel sends into finger peak channel estimator, is used in reference to the peak channel estimating.The vector dot product device is delivered on another road, utilizes to refer to that the output result of peak channel estimator does weighted.
After synchronizing pilot I/Q symbol sebolic addressing is sent into and is referred to the peak channel estimator, through the filtering of first order pole iir filter.Filtered synchronizing pilot I/Q symbol sebolic addressing is used for the data that refer to each quadrature code channel despreading output of peak demodulating unit are weighted as the output that refers to the peak channel estimator.Usually, filtered synchronizing pilot I/Q symbol sebolic addressing is than the time of 3 frequency pilot signs of data sequence (control information that recovers and business information data sequence) hysteresis of the quadrature code channel despreading output that is weighted.
Finger peak channel estimator in the Rake receiver that the present invention proposes, the time synchronized pilot tone I/Q symbol sebolic addressing of utilization from referring to that random sequence descrambling unit, peak demodulates obtains weight coefficient that each quadrature code channel (control information transmission and the business information) data sequence that refers to peak demodulation output (recovering) is weighted by time synchronized pilot tone I/Q symbol sebolic addressing being done first order pole IIR filtering.After process refers to that to each weighting is finished in peak demodulation output (control information that recovers and business information data sequence), for each code channel, the output result (the orthogonal dispreading data sequence after the weighting) that relevant all refer to the peak demodulating unit this code channel go merge in the phase place rotation combiner.In referring to the peak channel estimator, adopt the window index iir filter that time synchronized pilot tone I/Q symbol sebolic addressing is carried out filtering, improved the accuracy and the reliability that refer to the peak channel estimating.This refers to that the peak channel estimator is simple in structure, complexity is little, computing cost is low, channel estimation reliability is high, is easy to realization, practical, is very suitable for being embedded in the communication chip and realizes with hardware mode, can be directly commercial.
What need understand is: though the foregoing description is to the present invention's detailed explanation of contrasting; but these explanations are just illustrative to the present invention; rather than limitation of the present invention, any innovation and creation that do not exceed in the connotation of the present invention all fall within the scope of protection of the present invention.
Claims (1)
1, a kind of finger peak channel estimator, it is characterized in that: this channel estimator utilization refers to that the time synchronized pilot tone I/Q symbol sebolic addressing of peak random sequence descrambling module output does the filtering of first order pole window index infinite impulse response and obtain weight coefficient, and the data sequence of the finger peak demodulation in the quadrature code channel of each control information transmission and business information being exported with these weight coefficients is weighted then; This refers to that the annexation of peak channel estimator and operation principle are:
(1) this refers to that the peak channel estimator includes a first order pole window index IIR filter of time synchronized pilot tone I/Q symbol sebolic addressing being carried out the filtering of first order pole window index infinite impulse response;
(2) this refers to the peak channel estimator and refers to have interface between the peak random sequence descrambling module, obtains to refer to the time synchronized pilot tone I/Q symbol sebolic addressing of peak random sequence descrambling module output by this interface;
(3) this refers to that also and between each code channel orthogonal dispreading module there is interface in the peak channel estimator, by a vector dot product device, refers to that with this weight coefficient that peak channel estimator draws is weighted the dateout sequence of each code channel orthogonal dispreading module at this interface;
(4) this refers to the time synchronized random sequence descrambler in the random sequence descrambling unit, finger peak at channel estimator place, peak, utilization refers to the randomization sign indicating number that peak randomization sign indicating number sequencer produces, finish that the random sequence descrambling is carried out in the output of owing sampler to integration and integration is collected, demodulate time synchronized pilot tone I/Q symbol sebolic addressing, promptly refer to the time synchronized pilot tone I/Q symbol sebolic addressing of peak random sequence descrambling module output;
(5) after the time synchronized pilot tone I/Q symbol sebolic addressing that refers to the output of peak random sequence descrambling module is sent into this channel estimator, first order pole window index IIR filter in this channel estimator is done the filtering of first order pole window index infinite impulse response to time synchronized pilot tone I/Q symbol sebolic addressing, thereby obtains weight coefficient; The feature of this first order pole infinite impulse response filtering is:
1) if this refers to that the peak is a finger peak that has searched before, then time synchronized pilot tone I/Q symbol sebolic addressing is after being input to finger peak channel estimator, and this first order pole window index IIR filter is carried out filtering by following formula:
I
filtered-pilot(k)＝(1-β)·I
filtered-pilot(k-1)+β·I
pilot(k)
Q
filtered-pilot(k)＝(1-β)·Q
filtered-pilot(k-1)+β·Q
pilot(k)
2) if this refers to that the peak is the finger peak that a new search arrives, then time synchronized pilot tone I/Q symbol sebolic addressing is after being input to finger peak channel estimator, and this first order pole window index IIR filter is pressed following formula filtering:
I
filtered-pilot(k)＝I
pilot(k)
Q
filtered-pilot(k)＝Q
pilot(k)
In the formula, I
Pilot(k) express time synchronizing pilot I/Q symbol sebolic addressing also is an in-phase data values at the I of moment k data value; Q
Pilot(k) express time synchronizing pilot I/Q symbol sebolic addressing also is the quadrature phase data value at the Q of moment k data value; I
Filtered-pilot(k) and Q
Filtered-pilot(k) then be I respectively
Pilot(k) and Q
Pilot(k) value that after the filtering of process first order pole window index IIR filter, obtains, just weight coefficient; β is the forgetting factor of first order pole window index IIR filter;
(6) after this channel estimator is finished the filtering of first order pole window index infinite impulse response, the output weight coefficient to its with each code channel orthogonal dispreading module between the vector dot product device, the data of each quadrature code channel despreading being exported by this vector dot product device are weighted; And, be used for filtered time synchronized pilot tone I/Q symbol sebolic addressing, promptly above-mentioned I as weight coefficient
Filtered-pilot(k) and Q
Filtered-pilot(k), the data sequence of exporting than the quadrature code channel despreading that is weighted lags behind the time of 3 frequency pilot signs in time, and promptly this vector dot product device adopts following formula to finish weighting:
I
weighed-traffic(k)＝I
traffic(k)·I
filtered-pilot(k-3)
Q
weighed-traffic(k)＝Q
traffic(k)·Q
filtered-pilot(k-3)
In the formula, I
Traffic(k) data sequence of representing one of them quadrature code channel despreading output also is an in-phase data values at the I of moment k data value; Q
Traffic(k) data sequence of representing this quadrature code channel despreading output also is the quadrature phase data value at the Q of moment k data value; I
Weighed-traffic(k) and Q
Weighed-traffic(k) then be I respectively
Traffic(k) and Q
Traffic(k) in value through obtaining after the weighting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101027801A CN100518152C (en) | 2005-09-19 | 2005-09-19 | Finger channel estimator system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101027801A CN100518152C (en) | 2005-09-19 | 2005-09-19 | Finger channel estimator system |
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|---|---|
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| CN100518152C true CN100518152C (en) | 2009-07-22 |
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ID=36093727
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|---|---|---|---|
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| Country | Link |
|---|---|
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2005
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