CN1490958A - Realizing method and apparatus for signal locking indicating judgement - Google Patents

Abstract

This invention concerns a implementing method for deciding signal -locking instruction and its device. The above statement method is: the receiving signals are despread by correlating with PN code sequence of every antenna in the emission diversity, then calculates the energy of signal, and compares it with the threshold of the noise to decide signal-locking instruction. The above statement device includes: the signal energy calculating module used in despreading the received signal by correlating with PN code sequence of every antenna in the emission diversity, calculating the signal energy, and calculating the total signal energy according to sum of each signal energy; the module for calculating the noise threshold and the comparator. This invention fully utilizes the gain of the multi antenna in emission diversity, promotes the reliability of deciding signal-locking instruction.

Description

Implementation method and device thereof that the semaphore lock indication is judged

Technical field

The present invention relates to the mobile communication technology field, relate in particular to implementation method and device thereof that a kind of semaphore lock indication is judged.

Background technology

In the mobile communication system,, adopted the transmit diversity of forming by a plurality of transmitting antennas to communicate the emission of signal at the signal transmitting terminal in order to improve the quality of signal receiving end received signal.For example in the base station of WCDMA (Wideband Code Division Multiple Access (WCDMA)) communication system, just adopted transmit diversity techniques, the base station diversity technique can effectively be resisted multipath fading, and it is by merging the signal from a plurality of transmitting antennas to improve received signal quality.

Under the transmit diversity condition, signal arrives user side by two separate paths, the signal receiving end of user side generally includes several receiving branchs, be provided with a locking indication identifying unit in each receiving branch, the locking indication decision method that is adopted is for calculating received signal energy and noise energy respectively, concrete computational methods as shown in Figure 1, after received signal carried out despreading and handle, ask quadratic sum to handle again, the picked up signal energy after simultaneously received signal being carried out despreading and handling, asks quadratic sum to handle again, obtain noise signal energy, and with the noise signal energy and the noise gate factor acquisition Noise gate limit value that multiplies each other; Then the energy of received signal in this receiving branch is compared with noise gate, if signal energy less than noise gate, is then judged losing lock, the signal of this receiving branch output does not participate in the MRC (high specific merging) of received signal; If signal energy greater than noise energy, is then judged locking, the signal of this receiving branch output participates in the MRC of received signal.

By above-mentioned prior art scheme as can be seen, existing locking indication algorithm can not well utilize the information of two transmission paths, because existing locking indication algorithm only uses one tunnel local PN (pseudorandom) sign indicating number sequence relevant with received signal, therefore the information of another transmission paths has just lost under the transmit diversity condition, has also therefore reduced the reliability of existing semaphore lock indication decision method.

Summary of the invention

The purpose of this invention is to provide implementation method and device thereof that a kind of semaphore lock indication is judged, make full use of the gain of a plurality of transmitting antennas in the transmit diversity, increase the reliability that the locking indication is judged.

The object of the present invention is achieved like this: the implementation method that a kind of semaphore lock indication is judged, be with received signal respectively with the relevant despreading of the PN (pseudorandom) of each transmitting antenna of transmit diversity sign indicating number sequence, calculate signal energy, and compare with noise gate and to carry out semaphore lock indication and judge.

Described transmit diversity comprises two transmitting antennas: transmitting antenna 1 and transmitting antenna 2.

This method further comprises:

A, with the PN sign indicating number sequence conjugate multiplication of baseband signal and transmitting antenna 1, and obtain signal energy 1 according to the data after the despreading;

B, with the PN sign indicating number sequence conjugate multiplication of baseband signal and transmitting antenna 2, and obtain signal energy 2 according to the data after the despreading;

C, calculate signal energy 1 and signal energy 2 sums as total signal energy;

D, total signal energy and noise gate are relatively carried out the semaphore lock indication judge.

Described step c also comprises: after total signal energy is done single order FIR (limit for length's unit impulse response is arranged) filtering, and execution in step d.

Described steps d comprises:

D1, baseband signal postponed N sampled point after, with the PN sign indicating number sequence conjugate multiplication of this locality, and calculate the quadratic sum of I, Q two-way despread data, as the noise signal energy of baseband signal;

D2, the noise signal energy that calculates is done to multiply each other with the noise gate factor after the single order FIR filtering, acquire the Noise gate limit value;

D3, total signal energy and noise gate are relatively carried out the semaphore lock indication judge, and output locking indication result of determination.

The span of steps d 1 described baseband signal delay sampling point number N is: 20 samplings are counted to 800 samplings and are counted.

The implement device that a kind of semaphore lock indication is judged comprises:

Signal energy computation module: receiving baseband signal, with its respectively with transmit diversity in the PN sign indicating number sequence of each transmitting antenna carry out relevant despreading and handle, calculate each signal energy, and go out total signal energy, export to comparator again according to each signal energy computation;

Noise gate limit value computing module: receiving baseband signal, calculate its noise signal energy, calculate the Noise gate limit value according to noise signal energy again, and export to comparator;

Comparator: the total signal energy of difference received signal energy computing module output and the Noise gate limit value of Noise gate limit value computing module output, and compare, determine to export after result of determination is indicated in locking.

Described signal energy computation module also comprises:

One-channel signal energy meter operator module: receiving baseband signal, with its with transmit diversity in the PN sign indicating number sequence of each transmitting antenna carry out relevant despreading and handle, export to total signal energy computation submodule after calculating each road signal energy;

Total signal energy computation submodule: receive each road signal energy of each one-channel signal energy meter operator module output, and ask itself and, obtain exporting to single order FIR filter after total signal energy of received signal;

Single order FIR filter: receive total signal energy of total signal energy computation submodule output, and carry out exporting to comparator behind the smothing filtering.

The number of described one-channel signal energy meter operator module is consistent with the number of antenna.

Described noise gate computing module comprises:

The signal delay submodule: receiving baseband signal, and do to postpone to handle back output;

The noise signal energy calculating sub module: the baseband signal behind the receive delay, calculate its noise signal energy, and export to single order FIR filter;

Single order FIR filter: receive the noise signal energy of noise energy calculating sub module output, and carry out exporting to Noise gate limit value calculating sub module behind the smothing filtering;

Noise gate limit value calculating sub module: receive the noise signal energy of single order FIR filter output, itself and the noise gate factor are multiplied each other, obtain to export to comparator behind the Noise gate limit value.

By technique scheme as can be seen, the present invention has adopted many transmission paths information under the transmit diversity relevant with received signal, carry out the calculating of signal energy, and utilize the signal energy sum relevant that calculates to carry out the semaphore lock indication and judge with each transmission path information.Therefore, the present invention has made full use of the gain of a plurality of transmitting antennas in the transmit diversity, has improved the reliability that the semaphore lock indication is judged.

Description of drawings

Fig. 1 is existing semaphore lock indication decision method schematic diagram;

Fig. 2 is an application schematic diagram of the present invention;

Fig. 3 is semaphore lock indication decision method of the present invention and schematic representation of apparatus;

Fig. 4 is a PN sign indicating number sequence schematic diagram;

Fig. 5 judges schematic diagram for comparator locking indication.

Embodiment

Technical scheme provided by the present invention has been utilized the relevant despreading with received signal of a plurality of local PN sign indicating number sequence under the transmit diversity, carry out the calculating of signal energy, thereby make full use of the gain of a plurality of antennas under the transmit diversity, increased the reliability of semaphore lock indication judgement.Now with have under the transmit diversity two individual transmitting antenna be example the invention will be further described, semaphore lock of the present invention indication decision method and device are as Fig. 2, shown in Figure 3:

The implement device that semaphore lock of the present invention indication is judged provides a kind of new locking indication identifying unit, its applied environment as shown in Figure 2, its structure comprises as shown in Figure 3:

One-channel signal energy meter operator module: be used for received signal is handled with the relevant despreading of PN sign indicating number sequence of the single transmitting antenna of transmit diversity, calculate this road signal energy; This module has two, and its structure further comprises:

The signal despreading section: receiving baseband signal, with its respectively with transmit diversity in the PN sign indicating number sequence conjugate multiplication of each transmitting antenna, export to signal after the despreading of carrying out received signal is handled and ask the quadratic sum part;

Signal is asked the quadratic sum part: the despread data of received signal despreading section output, and the I, the Q two paths of data that obtain are handled in despreading asked quadratic sum to handle, export to total signal energy computation submodule after calculating one tunnel signal energy;

Total signal energy computation submodule: receive each road signal energy of one-channel signal energy meter operator module output, and it is sued for peace, export to comparator after total signal energy of acquisition received signal by the summation part;

Single order FIR (limit for length's unit impulse response is arranged) filter: receive total signal energy of total signal energy computation submodule output, and carry out exporting to comparator behind the smothing filtering;

The noise gate computing module: be used for according to received signal calculating noise threshold value, this module further comprises:

Receiving signal delayed submodule: receiving baseband signal, and will export to the signal despreading section of noise signal energy calculating sub module after its do delay processing;

The noise signal energy calculating sub module: the baseband signal behind the receive delay, and export single order FIR ripple device after calculating noise signal energy; This submodule further comprises:

The signal despreading section: receiving baseband signal, with itself and local PN sign indicating number sequence conjugate multiplication, export to signal after the despreading of carrying out received signal is handled and ask the quadratic sum part;

Signal is asked the quadratic sum part: the despread data of received signal despreading section output, and the I, the Q two paths of data that obtain are handled in despreading asked quadratic sum to handle, output single order FIR filter after the acquisition noise signal energy;

Single order FIR filter: receive the noise signal energy of noise signal energy calculating sub module output, and carry out exporting to Noise gate limit value calculating sub module behind the smothing filtering;

Noise gate limit value calculating sub module: receive the noise signal energy of single order FIR filter output, and itself and the noise gate factor are multiplied each other, obtain to export to comparator behind the Noise gate limit value;

Comparator: the Noise gate limit value of total signal energy of received signal energy computing module output and the output of Noise gate limit value computing module, and compare, export to the MRC module among Fig. 2 after definite locking indication result of determination.

The implementation method that semaphore lock indication of the present invention is judged may further comprise the steps:

Step 1: receiving terminal is made up of many receiving branchs usually, and a locking indication determination module all can be arranged in each receiving branch; The signal that antenna is received becomes baseband signal after handling through radio frequency and baseband signal processing module, and delivers to locking indication identifying unit and lock the indication determination processing;

Step 2: baseband signal at first with the PN sign indicating number sequence conjugate multiplication of antenna 1, finish the despreading of signal, promptly adopt following formula to calculate:

$\mathrm{<figure-callout\; id="1"\; label="symbol"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">symbol</figure-callout>}1\_i\left(k\right)+j*\mathrm{<figure-callout\; id="1"\; label="symbol"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">symbol</figure-callout>}1\_q\left(k\right)$

$=\underset{k}{\mathrm{\&Sigma;}}\{\mathrm{chip}\_i\left(k\right)+j*\mathrm{chip}\_q\left(k\right)\}*\{\mathrm{<figure-callout\; id="1"\; label="PN"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">PN</figure-callout>}1\_i\left(k\right)-j*\mathrm{<figure-callout\; id="1"\; label="PN"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">PN</figure-callout>}1\_q\left(k\right)\}$

$\mathrm{<figure-callout\; id="1"\; label="symbol"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">symbol</figure-callout>}1\_i\left(k\right)=\underset{k}{\mathrm{\&Sigma;}}\mathrm{chip}\_i\left(k\right)*\mathrm{<figure-callout\; id="1"\; label="PN"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">PN</figure-callout>}1\_i\left(k\right)+\mathrm{chip}\_q\left(k\right)*\mathrm{<figure-callout\; id="1"\; label="PN"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">PN</figure-callout>}1\_q\left(k\right)$

$\mathrm{<figure-callout\; id="1"\; label="symbol"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">symbol</figure-callout>}1\_q\left(k\right)=\underset{k}{\mathrm{\&Sigma;}}\mathrm{chip}\_q\left(k\right)*\mathrm{<figure-callout\; id="1"\; label="PN"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">PN</figure-callout>}1\_i\left(k\right)-\mathrm{chip}\_i\left(k\right)*\mathrm{<figure-callout\; id="1"\; label="PN"\; filenames="A0214418000161.png"\; state="\{\{state\}\}">PN</figure-callout>}1\_q\left(k\right)$

Wherein: chip_i (k) and chip_q (k) are respectively received signal I, Q two paths of data; PN1_i (k), PN1_q (k) are the PN sign indicating number sequence of the local antenna 1 that produces, and as shown in Figure 4, wherein the PN sign indicating number sequence on the antenna 1 is launched under the non diversity situation; And under transmit diversity situation, the PN sign indicating number sequence on antenna 1 and the antenna 2 is launched simultaneously; Symbol1_i (k) and symbol1_q (k) are respectively I after the despreading, Q two paths of data;

Step 3: calculate and utilize the I that obtains after the PN sign indicating number sequence despreading of antenna 1, the quadratic sum of Q two paths of data, promptly calculate the signal energy 1 of the PN sign indicating number sequence correspondence of antenna 1;

signal_pwr1＝symbol1_i ²(k)+symbol1_q ²(k)

Wherein: signal_pwr1 represents signal energy 1;

Step 4: with baseband signal and antenna 2PN sign indicating number sequence conjugate multiplication, finish the despreading of signal, promptly adopt following formula to calculate:

$\mathrm{symbol}2\_i\left(k\right)+j*\mathrm{symbol}2\_q\left(k\right)$

$=\underset{k}{\mathrm{\&Sigma;}}\{\mathrm{chip}\_i\left(k\right)+j*\mathrm{chip}\_q\left(k\right)\}*\{\mathrm{PN}2\_i\left(k\right)-j*\mathrm{PN}2\_q\left(k\right)\}$

$\mathrm{symbol}2\_i\left(k\right)=\underset{k}{\mathrm{\&Sigma;}}\mathrm{chip}\_i\left(k\right)*\mathrm{PN}2\_i\left(k\right)+\mathrm{chip}\_q\left(k\right)*\mathrm{PN}2\_q\left(k\right)$

$\mathrm{symbol}2\_q\left(k\right)=\underset{k}{\mathrm{\&Sigma;}}\mathrm{chip}\_q\left(k\right)*\mathrm{PN}2\_i\left(k\right)-\mathrm{chip}\_i\left(k\right)*\mathrm{PN}2\_q\left(k\right)$

Wherein: chip_i (k) and chip_q (k) are respectively received signal I, Q two paths of data; PN2_i (k), PN2_q (k) are the PN sign indicating number sequence of the local antenna 1 that produces; Symbol2_i (k) and symbol2_q (k) are I, Q two paths of data after the despreading;

Step 5: calculate and utilize the I that obtains after the PN sign indicating number sequence despreading of antenna 2, the quadratic sum of Q two paths of data, promptly calculate the signal energy 2 of the PN sign indicating number sequence correspondence of antenna 2;

signal_pwr2＝symbol2_i ²(k)+symbol2_q ²(k)

Wherein: signal_pwr2 represents signal energy 2;

Step 6: calculate total signal energy signal_pwr (K), that is:

signal_pwr(k)＝signal_pwr1(k)+signal_pwr2(k)

Step 7: total signal energy is made single order FIR Filtering Processing:

out_pwr(0)＝signal_pwr(0)

out_pwr(1)＝alfa*out_pwr(0)+(1-alfa)*signal_pwr(1)

out_pwr(2)＝alfa*out_pwr(1)+(1-alfa)*signal_pwr(2)

……

Wherein: alfa is a single order FIR filter coefficient, and the alfa value is between 0.5 to 0.995 usually;

The FIR filter mainly act as the smooth signal energy;

Step 8: baseband signal is postponed N sampled point;

The span of N is generally counted between 800 samplings count at 20 samplings point;

Step 9: data after will postponing and local PN sign indicating number sequence conjugate multiplication, finish the despreading that postpones the back data;

Step 10: the I after the calculating despreading, the quadratic sum of Q two paths of data, to obtain the noise signal energy of baseband signal;

Step 11: noise signal energy is made single order FIR Filtering Processing, and wherein noise signal energy is made single order FIR filter filtering factor value, with in the step 7 signal energy to be made single order FIR filter filtering factor value identical;

Step 12: send into comparator as noise gate after the noise signal energy after level and smooth multiply by the noise gate factor;

Step 13: the size of comparator comparison signal energy and noise gate; As shown in Figure 5, if signal energy less than noise gate, is then judged losing lock, comparator output losing lock index signal " 0 "; If signal energy greater than noise gate, is then judged locking, comparator output lock indication signal " 1 ".

So far, the implementation method process that the semaphore lock indication is judged finishes, and enters other corresponding processing procedure in the wireless communication system, as shown in Figure 2, may further comprise the steps:

Step 14: the locking indicating status of each receiving branch, i.e. the lock indication signal or the losing lock index signal of comparator output all are fed in the MRC module; According to the locking indicating status of each receiving branch, judge whether the dateout of each receiving branch participates in merging; If the locking indicating status of receiving branch is locking, then the dateout of this receiving branch participates in merging; If the locking indicating status of receiving branch is a losing lock, then the dateout of this receiving branch does not participate in merging;

Step 15: the data after the merging are admitted in the data extraction module, extract the data bit of received signal;

Step 16: the data bit that extracts is admitted to decoding module; After decoding finishes, the output original data bits.

Claims (11)

1, a kind of implementation method of semaphore lock indication judgement, it is characterized in that: with received signal respectively with the relevant despreading of the PN (pseudorandom) of each transmitting antenna of transmit diversity sign indicating number sequence, calculate signal energy, and compare with the Noise gate limit value and to carry out semaphore lock indication and judge.

2, the implementation method of semaphore lock indication judgement according to claim 1 is characterized in that described transmit diversity comprises two transmitting antennas: transmitting antenna 1 and transmitting antenna 2.

3, the implementation method of semaphore lock indication judgement according to claim 2 is characterized in that this method further comprises:

A, with the PN sign indicating number sequence conjugate multiplication of baseband signal and transmitting antenna 1, and obtain signal energy 1 according to the data after the despreading;

B, with the PN sign indicating number sequence conjugate multiplication of baseband signal and transmitting antenna 2, and obtain signal energy 2 according to the data after the despreading;

C, with signal energy 1 and signal energy 2 sums as total signal energy;

D, total signal energy and Noise gate limit value are relatively carried out the semaphore lock indication judge.

4, the implementation method of semaphore lock indication judgement according to claim 3 is characterized in that the I after described signal energy 1 and signal energy 2 are respectively the baseband signal despreading, the quadratic sum of Q two paths of data.

5, the implementation method of semaphore lock indication judgement according to claim 3 is characterized in that described step c also comprises: after total signal energy is done single order FIR (limit for length's unit impulse response is arranged) filtering, and execution in step d.

6, the implementation method of judging according to claim 3,4 or 5 described semaphore lock indications is characterized in that described steps d comprises:

D1, baseband signal postponed N sampled point after, with the PN sign indicating number sequence conjugate multiplication of this locality, and the quadratic sum of the I after definite despreading, Q two paths of data, as the noise signal energy of baseband signal;

D2, noise signal energy is done to multiply each other with the noise gate factor after the single order FIR filtering, acquire the Noise gate limit value;

D3, total signal energy and Noise gate limit value are relatively carried out the semaphore lock indication judge, and output locking indication result of determination.

7, the implementation method judged of semaphore lock according to claim 6 indication is characterized in that the span of steps d 1 described baseband signal delay sampling point number N is: 20 samplings are counted to 800 samplings and are counted.

8, a kind of implement device of semaphore lock indication judgement is characterized in that comprising:

Signal energy computation module: receiving baseband signal, respectively with transmit diversity in the PN sign indicating number sequence of each transmitting antenna carry out relevant despreading and handle, determine each signal energy, and determine total signal energy, and total signal energy is exported to comparator according to each signal energy;

Noise gate limit value computing module: receiving baseband signal, calculate its noise signal energy, determine the Noise gate limit value according to noise signal energy again, and the Noise gate limit value is exported to comparator;

Comparator: the Noise gate limit value of total signal energy of received signal energy computing module output and the output of Noise gate limit value computing module, and compare, determine to export after the locking indication result of determination.

9, the implement device of semaphore lock indication judgement according to claim 8 is characterized in that described signal energy computation module also comprises:

One-channel signal energy meter operator module: receiving baseband signal, and with its relevant despreading processing with the PN sign indicating number sequence of each transmitting antenna in the transmit diversity, determine each road road signal energy and export to total signal energy computation submodule;

Total signal energy computation submodule: receive each road signal energy of each one-channel signal energy meter operator module output, and ask itself and, obtain exporting to single order FIR filter after total signal energy of received signal;

Single order FIR filter: receive total signal energy of total signal energy computation submodule output, and it is carried out exporting to comparator behind the smothing filtering.

10, the implement device of semaphore lock indication judgement according to claim 9 is characterized in that the number of described one-channel signal energy meter operator module is consistent with the number of antenna.

11, the implement device of semaphore lock indication judgement according to claim 8 is characterized in that described noise gate computing module comprises:

The signal delay submodule: receiving baseband signal, and do to postpone to handle back output;

The noise signal energy calculating sub module: the baseband signal after the delay of receiving signal delayed submodule output, ask quadratic sum to handle by separating to extend to, and export to single order FIR filter with definite its noise signal energy;

Single order FIR filter: receive the noise signal energy of noise signal energy calculating sub module output, and carry out exporting to Noise gate limit value calculating sub module behind the smothing filtering;

Noise gate limit value calculating sub module: receive the noise signal energy of single order FIR filter output, and itself and the noise gate factor are multiplied each other, obtain the Noise gate limit value and export to comparator.

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