CN1194562C - Device and method for estimating burst sygnal signal-to-noise ratio in global mobile communication system base station - Google Patents
Device and method for estimating burst sygnal signal-to-noise ratio in global mobile communication system base station Download PDFInfo
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- CN1194562C CN1194562C CN 02110616 CN02110616A CN1194562C CN 1194562 C CN1194562 C CN 1194562C CN 02110616 CN02110616 CN 02110616 CN 02110616 A CN02110616 A CN 02110616A CN 1194562 C CN1194562 C CN 1194562C
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Abstract
The present invention discloses a device and a method thereof for estimating the signal-to-noise ratios of burst signals of a base station of a global mobile communication system. The device comprises a receiver, a demodulator and a decoder, wherein the receiver receives signals from a wireless port, and the signals form figurative baseband burst signals after frequency conversion and filtration; after the signals are output to the demodulator, judgment data is generated, and then, the signals are output to the decoder. The device is characterized in that the device also comprises a signal-to-noise ratio estimating module; the input end of the signal-to-noise ratio estimating module inputs the baseband burst signals, and the output end of the signal-to-noise ratio estimating module output signal-to-noise ratio signals; the baseband burst signals and the signal-to-noise ratio signals are combined and input to the demodulator and the decoder; the demodulator simultaneously receives the baseband burst signals and the signal-to-noise ratio signals, and the judgment data is generated after the baseband burst signals and the signal-to-noise ratio signals are demodulated; the judgment data and the signal-to-noise ratio signals are transmitted to the decoder together to obtain decoding results. The method uses the receiver of the base station to receives the burst signals and known training sequences, and the ratios of the signal energy of the burst signals to the noise energy of the burst signals are calculated through a novel method, namely the signal-to-noise ratios. The present invention has the advantages of simple and effective method, little operation amount and accurate calculation.
Description
Technical field
The present invention relates to a kind of in global system for mobile telecommunications (GSM) system the device and method of base station estimating burst Signal-to-Noise.
Technical background
Gsm system is a kind of mobile communication system that has been widely used, is a kind of typical time-division multiple address system.In this system, aloft Chuan Shu signal is divided into the signal of a period of time, a period of time according to the time quantum that equates.In gsm system, a segment signal that is divided into the minimum time unit is called as burst.Burst also becomes base station or mobile phone are separated mediation decoding to aerial signal minimum unit thereupon.
Burst is divided into five kinds, and the duration of a modal normal burst is 577 microseconds, is divided into 156.25 bit time domains again, and label is 0-156, and its structure is as shown in the table:
| Bit number | The territory is long | Content |
| 0 -2 | 3 | The tail bit |
| 3 -41 | 39 | Information bit |
| 42 -105 | 64 | Training sequence |
| 106 -144 | 39 | Information bit |
| 145 -147 | 3 | The tail bit |
| 148 -156 | 8,25 | Inspect bit |
Wherein, the training bit is known to the base station, and information bit is the target that demodulation is attempted in the base station.
Wireless channel is very complicated.Because the electric wave transmission environment with the motion with respect to the base station of the residing change in location of vehicle and vehicle, becomes decline during generation, multidiameter delay makes that again the intersymbol interference in the gsm system is very serious; And aerial various electromagnetic interference and electromagnetic noise, and the physical noise that is produced in the receiver of base station all make the base station that separating of burst is in harmonious proportion and decipher very difficulty and important.
In the burst demodulation techniques that adopt general base station, all adopted conventional equalizing demodulation technology.As shown in Figure 1, Fig. 1 is the structural representation of the conciliation and the decoding of conventional base station, comprising: receiver 11, demodulator 12 and decoder 13.Receiver receives signal from wireless mouth, after frequency conversion and filtering, has formed the base band burst of digital form, and this signal generates the judgement data after outputing to demodulator, delivers to decoder output decode results again.The advantage of this technology is directly to demodulate useful signal in the burst by balancing technique.But this demodulation techniques are not made assessment to the quality of current burst, do not utilize this information that possible performance is carried out in the demodulation of burst and strengthen.Though can calculate the error rate of a speech frame by deciphering step,, therefore can not assess the quality of single burst because a speech frame contains 8 bursts.
Summary of the invention
The objective of the invention is the quality of current burst not to be made assessment, do not utilized this information that the shortcoming that possible performance strengthens is carried out in the demodulation of burst in order to overcome existing base station demodulation techniques, and a kind of signal to noise ratio of utilizing each burst that proposes, can assess the quality of each burst, separate and be in harmonious proportion decoding and can utilize the signal to noise ratio of burst to carry out the improvement of algorithm, be in harmonious proportion the devices and methods therefor of base station in GPS system estimating burst Signal-to-Noise of decoding ability thereby can further promote base station separating to received signal.
For achieving the above object, the technical scheme that the present invention takes is: the device of base station in GPS system estimating burst Signal-to-Noise, comprise: receiver, demodulator and decoder, receiver receives signal from wireless mouth, after frequency conversion and filtering, formed the base band burst of digital form, this signal generates the judgement data after outputing to demodulator, outputs to decoder again; Be characterized in, also comprise a signal-to-noise ratio (SNR) estimation module, its input input base band burst, its output output signal-to-noise ratio signal also is input to demodulator and decoder respectively, demodulator receives the base band burst simultaneously and signal-noise ratio signal generates the judgement data after demodulation, these judgement data are delivered to decoder with signal-noise ratio signal, obtain decode results.
The device of above-mentioned base station in GPS system estimating burst Signal-to-Noise, wherein, described signal-to-noise ratio (SNR) estimation module comprises one first correlator block, one second correlator block, one first all square device module, one second all square device module, a subtracter block and a divider module; Base band burst by receiver output is delivered to first correlator block and subtracter block simultaneously, and training sequence is also delivered to first correlator block simultaneously; Output to second correlator block after the first correlator block correlation computations, training sequence is also delivered to second correlator block simultaneously; Obtain useful signal and partly divide two-way output after second correlator block is carried out correlation computations, the one tunnel outputs to the first all square device module, and another road is to subtracter; After subtracter block is partly subtracted each other base band burst and useful signal, obtain noise section and output to the second all square device module; Noise energy by all square device module output of the signal energy and second of the first all square device module output is divided by in divider module, obtains signal to noise ratio.
Above-mentioned base station in GPS system estimating burst Signal-to-Noise device carries out the method for burst signal-to-noise ratio (SNR) estimation, wherein, each burst is carried out the assessment of independent signal quality, directly concern by each burst and the known training sequence of this burst, isolate effective signal section and noise section in this burst, thereby calculate the signal to noise ratio of this burst.
The method of above-mentioned base station in GPS system estimating burst Signal-to-Noise is characterized in, this method further may further comprise the steps:
A, burst and known training sequence are carried out correlation computations in first correlator block of channel parameter estimation module, obtain this burst aloft the channel parameter of wireless channel of process;
B, with training sequence with go up the channel parameter that the step calculates and in second correlator block, carry out correlation computations second time, obtain effective signal section in this burst;
C, calculate the average energy of this signal section by equal square devices;
D, simultaneously by subtracter block with burst and effectively signal section subtract each other, obtain the noise section in the burst;
E, by the average energy of second all square device module calculating noise part;
F, by divider module the average energy of signal section and the average energy of noise section are divided by again, obtain the signal to noise ratio of this burst.
Because the present invention has adopted above calculating measure, utilize burst that the receiver of base station receives and known training sequence,, calculate the ratio of the signal energy and the noise energy of this burst by a kind of signal to noise ratio channel estimation module, therefore operand is little, calculates accurately.
Description of drawings
Concrete characteristic performance of the present invention is further described by following embodiment and accompanying drawing thereof.
Fig. 1 is the demodulation techniques structural representation of conventional base station.
Fig. 2 is the apparatus structure schematic diagram of base station in GPS system estimating burst Signal-to-Noise of the present invention.
Fig. 3 is the structural representation of signal-to-noise ratio (SNR) estimation module among Fig. 2.
Fig. 4 is a signal-noise ratio estimation method flow chart of the present invention.
Embodiment
Utilization of the present invention directly concerns by burst and known training sequence, isolates effective signal section and noise section in the burst, thereby calculates the signal to noise ratio of this burst.
See also Fig. 2.The device of base station in GPS system estimating burst Signal-to-Noise of the present invention comprises: receiver 21, demodulator 22 and decoder 23 also comprise a signal-to-noise ratio (SNR) estimation module 24; Receiver 21 receives signal from wireless mouth, after frequency conversion and filtering, has formed the base band burst of digital form, and this signal has a series of numerical chracter to represent, each numerical chracter all is a plural number, promptly comprises real part and imaginary part two parts.Training sequence then is made up of 26 fixing+1 and-1, and concerning the base station, training sequence is known, as previously mentioned.This base band burst is delivered to the input and the demodulator module of signal-to-noise ratio (SNR) estimation module respectively, signal-to-noise ratio (SNR) estimation module and output signal-to-noise ratio signal are input to demodulator and decoder respectively, demodulator receives base band burst and signal-noise ratio signal simultaneously, after demodulation, generate the judgement data, these judgement data are delivered to decoder with signal-noise ratio signal, obtain decode results.
See also Fig. 3.Signal-to-noise ratio (SNR) estimation module of the present invention comprises one first correlator block 242, one second correlator block, 243, one first all square device module 244, one second all square device module 245, a subtracter block 246 and a divider module 247; Base band burst by receiver 21 outputs is delivered to first correlator block 242 and subtracter block 246 simultaneously, and training sequence is also delivered to first correlator block 242 simultaneously; Output to second correlator block 243 after first correlator block, 242 correlation computations, training sequence is also delivered to second correlator block 243 simultaneously; Obtain useful signal and partly divide two-way output after second correlator block 243 is carried out correlation computations, the one tunnel outputs to the first all square device module 244, and another road is to subtracter 246; After subtracter block 246 is partly subtracted each other base band burst and useful signal, obtain noise section and output to the second all square device module 245; Noise energy by all square device module 245 outputs of the signal energy and second of first all square device module 244 outputs is divided by in divider 247 modules, obtains signal to noise ratio.
The method of base station in GPS system estimating burst Signal-to-Noise of the present invention, directly concern by burst and known training sequence, isolate effective signal section and noise section in the burst, thereby calculate the signal to noise ratio of this burst.
Ask for an interview Fig. 4, the inventive method may further comprise the steps:
A, burst and known training sequence are carried out correlation computations in first correlator block of channel parameter estimation module, obtain this burst aloft the channel parameter of wireless channel of process;
B, with training sequence with go up the channel parameter that the step calculates and in second correlator block, carry out correlation computations second time, obtain effective signal section in this burst;
C, calculate the average energy of this useful signal part by equal square devices, this energy is the average energy of useful signal part;
D, simultaneously by subtracter block with burst and effectively signal section subtract each other, obtain the noise section in the burst;
E, by the average energy of second all square device module calculating noise part, this energy is the average energy of noise section;
F, by divider module the average energy of signal section and the average energy of noise section are divided by again, obtain the signal to noise ratio of this burst.
The present invention can estimate the uplink burst Signal-to-Noise the GSM base station, also can be used for the estimation of mobile phone to the downlink burst Signal-to-Noise, and can use in the wireless system of other type.
Claims (4)
1, the device of base station in GPS system estimating burst Signal-to-Noise, comprise: receiver, demodulator and decoder, receiver receives signal from wireless mouth, after frequency conversion and filtering, formed the base band burst of digital form, this signal generates the judgement data after outputing to demodulator, outputs to decoder again; It is characterized in that, also comprise a signal-to-noise ratio (SNR) estimation module, its input input base band burst, its output output signal-to-noise ratio signal also is input to demodulator and decoder respectively, demodulator receives the base band burst simultaneously and signal-noise ratio signal generates the judgement data after demodulation, these judgement data are delivered to decoder with signal-noise ratio signal, obtain decode results.
2, the device of base station in GPS system estimating burst Signal-to-Noise according to claim 1, it is characterized in that described signal-to-noise ratio (SNR) estimation module comprises one first correlator block, one second correlator block, one first all square device module, one second all square device module, a subtracter block and a divider module; Base band burst by receiver output is delivered to first correlator block and subtracter block simultaneously, and training sequence is also delivered to first correlator block simultaneously; Output to second correlator block after the first correlator block correlation computations, training sequence is also delivered to second correlator block simultaneously; Obtain useful signal and partly divide two-way output after second correlator block is carried out correlation computations, the one tunnel outputs to the first all square device module, and another road is to subtracter; After subtracter block is partly subtracted each other base band burst and useful signal, obtain noise section and output to the second all square device module; Noise energy by all square device module output of the signal energy and second of the first all square device module output is divided by in divider module, obtains signal to noise ratio.
3, a kind of base station in GPS system estimating burst Signal-to-Noise device according to claim 1 carries out the method for burst signal-to-noise ratio (SNR) estimation, it is characterized in that, each burst is carried out the assessment of independent signal quality, directly concern by each burst and the known training sequence of this burst, isolate effective signal section and noise section in this burst, thereby calculate the signal to noise ratio of this burst.
4, the method for base station in GPS system estimating burst Signal-to-Noise according to claim 3 is characterized in that, this method further may further comprise the steps:
A, burst and known training sequence are carried out correlation computations in first correlator block of channel parameter estimation module, obtain this burst aloft the channel parameter of wireless channel of process;
B, with training sequence with go up the channel parameter that the step calculates and in second correlator block, carry out correlation computations second time, obtain effective signal section in this burst;
C, calculate the average energy of this signal section by equal square devices;
D, simultaneously by subtracter block with burst and effectively signal section subtract each other, obtain the noise section in the burst;
E, by the average energy of second all square device module calculating noise part;
F, by divider module the average energy of signal section and the average energy of noise section are divided by again, obtain the signal to noise ratio of this burst.
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|---|---|---|---|
| CN 02110616 CN1194562C (en) | 2002-01-23 | 2002-01-23 | Device and method for estimating burst sygnal signal-to-noise ratio in global mobile communication system base station |
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| CN 02110616 CN1194562C (en) | 2002-01-23 | 2002-01-23 | Device and method for estimating burst sygnal signal-to-noise ratio in global mobile communication system base station |
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| CN100448183C (en) * | 2004-06-07 | 2008-12-31 | 东南大学 | Online S/N ratio estimation of calibrated average for Rayleigh channel |
| CN100375556C (en) * | 2004-10-29 | 2008-03-12 | 大唐移动通信设备有限公司 | Method for testing mobile communication system burst signal |
| CN101932069A (en) * | 2010-09-02 | 2010-12-29 | 华为技术有限公司 | Access control method, access network device and communication system |
| TWI672928B (en) * | 2017-11-03 | 2019-09-21 | 財團法人資訊工業策進會 | Base station, and method for operating the base station |
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