CN101370224A - Multi-antenna modulate type detection method for EDGE system - Google Patents

Abstract

The invention provides a method of multi-antenna detecting and modulating type of EDGE system, comprising the following steps: 1, for the first normal burst pulse in the uplink packet service data block, respectively calculating the composite noise variance of GMSK and composite noise variance of 8PSK of the multi-antenna; step 2, comparing the composite noise variance of GMSK with the composite noise variance of 8PSK, ensuring the modulating type of the first normal burst pulse according to the comparing result; and step 3, ensuring the modulating types of the next three normal burst pulses according to the modulating type of the first normal burst pulse. So, the invention greatly reduces the calculating complexity and ensures the performance of the baseband system under the condition of satisfying the mobile communication system protocol standard.

Description

The method of the multi-antenna modulate type detection of EDGE system

Technical field

The present invention relates to field of mobile communication, relate in particular to the method for the multi-antenna modulate type detection of a kind of EDGE of being applicable to system.

Background technology

GSM has obtained using widely in worldwide as second generation mobile cellular communication system.But along with the development and the professional variation of mobile communication technology, people constantly increase the demand of data business.What gsm system adopted is the modulation system of GMSK (GMSK (Guassian Minimum Shift Keying)), cover with the wide area of the 384kbit/s data rate of 3-G (Generation Three mobile communication system) and approximately the local of 2Mbit/s data transfer rate cover and also greatly differ from each other.At present, ETSI (ETSI) has determined to develop the GSM evolution scheme-EDGE (Enhanced Data rates for GSM Evolution) of enhancing data rate as the GSM evolution direction in future.

In order to provide higher data communication rates in existing cellular system, EDGE has introduced many level digitals modulation system--the 8PSK modulation.Because the 8PSK modulation is a kind of linear modulation, 3 successive bits are mapped to a symbol of I/Q coordinate, thereby higher bit rate and spectrum efficiency can be provided.Simultaneously, the modulation system of the GMSK that uses in the gsm system also is the part of EDGE modulation system.The character rate of two kinds of modulation systems all is 271kbit/s, and the net bit rate of every time slot is respectively 22.8kbit/s (GMSK) and 69.2kbit/s (8PSK).The EDGE system is under different channel situation, 9 kinds of different modulation coding mode-MCS can be provided (Modulation and Coding Scheme), wherein MCS1～4 uses remains GMSK modulation mode in the gsm system, is 8PSK modulation mode and use MCS5～9.

In the EDGE system, packet traffic channel (PDTCH) is a carrying user data under packet switched mode.All grouped channels all are based on the multi-frame structure that is made of 52 tdma frames, wherein comprised 12 data blocks, and each data block are made up of 4 continuous tdma frames.The base station is for the grouping busihess data piece that terminal equipment sent, and do not know that its employed modulation system is GMSK modulation or 8PSK modulation.Existing way is to adopt the method for judging noise variance, promptly at first adopt the mode of GMSK symbol rotation to come calculating noise variance, and then the mode calculating noise variance that adopts the 8PSK symbol to rotate, both compare, and judge the modulation type of GMSK and 8PSK.The benefit of this way is that complexity is lower, can guarantee the correctness of the NB demodulation that each is up in actual applications preferably.But the shortcoming of this kind method is exactly when signal is smaller, occurs the modulation type misjudgment easily, can cause demodulation to fall flat like this.

At publication number is in " Detection of Modulation Type " patent application of WO2005/109808, discloses a kind of method of judging GMSK and 8PSK modulation type in the EDGE system.It uses the I part of received signal and Q correlation partly to calculate the tolerance that can reflect interfering energy, and measures by this and to judge that the GMSK modulation type still is the 8PSK modulation type.This technology adopts the Whittle-Wiggins-Robinson algorithm loop iteration to carry out white noise and handles, and calculates the tolerance of the interfering energy of GMSK and 8PSK.But owing to adopted the loop iteration algorithm, complexity height very is difficult to adopt in real system.

In publication number was 2006/0215789 U.S. Patent application " Detection of SignalModulation Format Type ", a kind of method of judging GMSK and 8PSK modulation type in the EDGE system was disclosed.It needs basis modulation type testing result of last pulse or preceding several pulses on same judge that together the signal to noise ratio or the noise energy information that wherein will use the front pulse are judged when the modulation type of judging when prepulse.This independently carries out the method that modulation type detects with respect to traditional pulse, has the performance of 3-5dB to improve.But owing to when the modulation type that detects when prepulse, need comprehensively judge according to the result of front, situation totally can appear judging by accident.In addition, the judgement of first pulse debug-type is depended in the judgement of several pulse modulation types of back.Therefore, fundamentally do not solve the success rate of first pulse modulation type.

In " determining the receiver of modulation type " of patent 02803159.8, a kind of method of modulation of definite transmission signal is disclosed.For the signal that is sent, carry out the estimation of channel at every kind of restituted signal, channel estimation value comprises m tap, selects the n of the energy maximum in each channel estimating tap individual, wherein n＜m; Estimate the variance of each restituted signal according to n tap with least square method, determine the modulation system of transmission signal by variance relatively.It is mainly used on the determining of GMSK and 8PSK signal.But this method at first will be carried out twice demodulation to signal, and then judges the type of modulation signal according to the variance of being calculated.Major defect is just to utilize single antenna to carry out the judgement of GMSK and 8PSK modulation type, does not make full use of the gain of many antennas.

In sum, the shortcoming of prior art is exactly the advantage that does not make full use of many antennas, is subjected to many influences through disturbing easily, and complexity is than higher.People press for a kind of method that simply and effectively detects GMSK and 8PSK modulation type, and it both can guarantee the correct demodulation of upstream data, can reduce the computational complexity of baseband system again.Simultaneously, for the EDGE system, can be with more simple and effective and efficient manner detects GMSK and 8PSK modulation type.The noise variance that promptly utilizes many antennas to calculate is distinguished GMSK and the 8PSK modulation type in the upstream packet business datum piece, can guarantee the performance of baseband system like this, can reduce computational complexity again.

Summary of the invention

In view of the above problems, the object of the present invention is to provide the method for the multi-antenna modulate type detection of a kind of EDGE system, it has lowered computation complexity greatly under the prerequisite that satisfies the mobile communication system protocol specification, guaranteed the performance of baseband system simultaneously.

One aspect of the present invention provides the method for the multi-antenna modulate type detection of a kind of EDGE of being used for system, it may further comprise the steps: step 1, for first the conventional burst in the upstream packet business datum piece, calculate the composite noise variance of GMSK of many antennas and the composite noise variance of 8PSK respectively; Step 2 compares the composite noise variance of GMSK and the composite noise variance of 8PSK, and determines the modulation type of first conventional burst according to comparative result; And step 3, determine the modulation type of follow-up three conventional bursts according to the modulation type of first conventional burst.

In above-mentioned steps 1, comprise: calculate the received signal strength indicator value on each antenna in many antennas respectively; And whether judge received signal strength indicator value greater than predetermined threshold, if greater than predetermined threshold, then the signal on the pairing antenna of strength indicator value carries out respectively that GMSK handles and 8PSK handles to received signal, otherwise, ignore the signal on the antenna.

Above-mentioned GMSK handles and comprises: the signal on the antenna is carried out-signal after the upset of pi/2 symbol is handled and upset handled carries out channel parameter estimation.

And, when carrying out above-mentioned GMSK when handling, adopt the slip correlation technique to carry out channel parameter estimation, calculate by following formula: $h_i^{\mathrm{GMSK}}\left(k\right)=\frac{1}{L_h}\underset{p=0}{\overset{L_h-1}{\mathrm{\Σ}}}{y}_i^{\mathrm{GMSK}}\left(p\right)\·a(k+p),$ Wherein,

The estimated value of channel parameter when handling for GMSK,

Be the signal after upset is handled, the scope of k is [0, M-1], and M is an actual channel disperse length, and a (k) is a training sequence, and L _hFor estimating the channel parameter Len req, less than the length of training sequence.

Above-mentioned 8PSK handles and comprises: the signal on the antenna is carried out-3 π/8 symbols upset handle, and the signal after the upset processing is carried out channel parameter estimation.

And, when carrying out the 8PSK processing, adopt the slip correlation technique to carry out channel parameter estimation, calculate by following formula: ${\mathrm{<figure-callout\; id="8"\; label="h\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">h</figure-callout>}}_i^{}\left(k\right)=\frac{1}{L_h}\underset{p=0}{\overset{L_h-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="8"\; label="y\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">y</figure-callout>}}_i^{}\left(p\right)\&CenterDot;a(k+p),$ Wherein,

The estimated value of channel parameter when handling for GMSK, Be the signal after upset is handled, the scope of k is [0, M-1], and M is an actual channel disperse length, and a (k) is a training sequence, and L _hFor estimating the channel parameter Len req, less than the length of training sequence.

Wherein, the composite noise variance of GMSK is calculated by following formula: $Q_{\mathrm{GMSK}}=\frac{1}{N\&CenterDot;N_{\mathrm{\&sigma;}}}\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=0}{\overset{N_{\mathrm{\&sigma;}}-1}{\mathrm{\&Sigma;}}}{|y_i^{\mathrm{GMSK}}\left(k\right)-\underset{j=0}{\overset{L-1}{\mathrm{\&Sigma;}}}{h}_i^{\mathrm{GMSK}}\left(j\right)\&CenterDot;a(k-j)|}^2,$ Wherein, N is the antenna number, N _σFor carrying out the training sequence number that the composite noise variance is calculated,

Be the signal after the upset processing,

Be the estimated channel parameter, and a (k) is a training sequence.

And the composite noise variance of 8PSK is calculated by following formula: ${\mathrm{<figure-callout\; id="8"\; label="Q"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{8\mathrm{PSK}}=\frac{1}{N\&CenterDot;N_{\mathrm{\&sigma;}}}\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=0}{\overset{N_{\mathrm{\&sigma;}}-1}{\mathrm{\&Sigma;}}}{|{\mathrm{<figure-callout\; id="8"\; label="y\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">y</figure-callout>}}_i^{}\left(k\right)-\underset{j=0}{\overset{L-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="8"\; label="h\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">h</figure-callout>}}_i^{}\left(j\right)\&CenterDot;a(k-j)|}^2,$ Wherein, N is the antenna number, N _σFor carrying out the training sequence number that the composite noise variance is calculated,

Be the signal after the upset processing, Be the estimated channel parameter, and a (k) is a training sequence.

In addition, in step 2, under the situation of composite noise variance greater than the composite noise variance of GMSK of 8PSK, comprise following processing: the modulation type of determining first conventional burst is GMSK, carries out the GMSK demodulation, and Demod_Flag is changed to GMSK.

In step 2, be not more than in the composite noise variance of 8PSK under the situation of composite noise variance of GMSK, comprise following processing: the modulation type of determining first conventional burst is 8PSK, carries out the 8PSK demodulation, and Demod_Flag is changed to 8PSK.

In step 3, comprise following processing: after first conventional burst demodulation is finished, determine the modulation type of follow-up three conventional bursts, and follow-up three conventional bursts are carried out demodulation according to modulation type according to Demod_Flag.

Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the flow chart according to the method for the multi-antenna modulate type detection of EDGE of the present invention system;

Fig. 2 is the basic schematic diagram of the channel model of mobile communication system;

Fig. 3 is the diagrammatic sketch of the data format of the conventional burst in the EDGE system;

Fig. 4 is according to the many antenna detection GMSK of the embodiment of the invention and the flow chart of 8PSK modulation type;

Fig. 5 adopts many antenna detection GMSK and 8PSK modulation type method, the schematic diagram of the performance curve under TU50 according to the embodiment of the invention, when reality transmission modulation type is GMSK; And

Fig. 6 adopts many antenna detection GMSK and 8PSK modulation type method, the schematic diagram of the performance curve under TU50 according to the embodiment of the invention, when reality transmission modulation type is 8PSK.

Embodiment

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.

Fig. 1 is the flow chart according to the method for the multi-antenna modulate type detection of EDGE of the present invention system.As shown in Figure 1, the method of the multi-antenna modulate type detection of EDGE system may further comprise the steps: step S102, for first the conventional burst in the upstream packet business datum piece, calculate the composite noise variance of GMSK of many antennas and the composite noise variance of 8PSK respectively; Step S104 compares the composite noise variance of GMSK and the composite noise variance of 8PSK, and determines the modulation type of first conventional burst according to comparative result; And step S106, determine the modulation type of follow-up three conventional bursts according to the modulation type of first conventional burst.

In above-mentioned steps S102, comprise: calculate the received signal strength indicator value on each antenna in many antennas respectively; And whether judge received signal strength indicator value greater than predetermined threshold, if greater than predetermined threshold, then the signal on the pairing antenna of strength indicator value carries out respectively that GMSK handles and 8PSK handles to received signal, otherwise, ignore the signal on the antenna.

Above-mentioned GMSK handles and comprises: the signal on the antenna is carried out-signal after the upset of pi/2 symbol is handled and upset handled carries out channel parameter estimation.

And, when carrying out above-mentioned GMSK when handling, adopt the slip correlation technique to carry out channel parameter estimation, calculate by following formula: $h_i^{\mathrm{GMSK}}\left(k\right)=\frac{1}{L_h}\underset{p=0}{\overset{L_h-1}{\mathrm{\&Sigma;}}}{y}_i^{\mathrm{GMSK}}\left(p\right)\&CenterDot;a(k+p),$ Wherein,

The estimated value of channel parameter when handling for GMSK,

Be the signal after upset is handled, the scope of k is [0, M-1], and M is an actual channel disperse length, and a (k) is a training sequence, and L _hFor estimating the channel parameter Len req, less than the length of training sequence.

Above-mentioned 8PSK handles and comprises: the signal on the antenna is carried out-3 π/8 symbols upset handle, and the signal after the upset processing is carried out channel parameter estimation.

And, when carrying out the 8PSK processing, adopt the slip correlation technique to carry out channel parameter estimation, calculate by following formula: ${\mathrm{<figure-callout\; id="8"\; label="h\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">h</figure-callout>}}_i^{}\left(k\right)=\frac{1}{L_h}\underset{p=0}{\overset{L_h-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="8"\; label="y\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">y</figure-callout>}}_i^{}\left(p\right)\&CenterDot;a(k+p),$ Wherein,

The estimated value of channel parameter when handling for GMSK,

Be the signal after upset is handled, the scope of k is [0, M-1], and M is an actual channel disperse length, and a (k) is a training sequence, and L _hFor estimating the channel parameter Len req, less than the length of training sequence.

Wherein, the composite noise variance of GMSK is calculated by following formula: $Q_{\mathrm{GMSK}}=\frac{1}{N\&CenterDot;N_{\mathrm{\&sigma;}}}\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=0}{\overset{N_{\mathrm{\&sigma;}}-1}{\mathrm{\&Sigma;}}}{|y_i^{\mathrm{GMSK}}\left(k\right)-\underset{j=0}{\overset{L-1}{\mathrm{\&Sigma;}}}{h}_i^{\mathrm{GMSK}}\left(j\right)\&CenterDot;a(k-j)|}^2,$ Wherein, N is the antenna number, N _σFor carrying out the training sequence number that the composite noise variance is calculated,

Be the signal after the upset processing,

Be the estimated channel parameter, and a (k) is a training sequence.

And the composite noise variance of 8PSK is calculated by following formula: ${\mathrm{<figure-callout\; id="8"\; label="Q"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{8\mathrm{PSK}}=\frac{1}{N\&CenterDot;N_{\mathrm{\&sigma;}}}\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=0}{\overset{N_{\mathrm{\&sigma;}}-1}{\mathrm{\&Sigma;}}}{|{\mathrm{<figure-callout\; id="8"\; label="y\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">y</figure-callout>}}_i^{}\left(k\right)-\underset{j=0}{\overset{L-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="8"\; label="h\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">h</figure-callout>}}_i^{}\left(j\right)\&CenterDot;a(k-j)|}^2,$ Wherein, N is the antenna number, N _σFor carrying out the training sequence number that the composite noise variance is calculated,

Be the signal after the upset processing,

Be the estimated channel parameter, and a (k) is a training sequence.

In addition, in step S104, under the situation of composite noise variance greater than the composite noise variance of GMSK of 8PSK, comprise following processing: the modulation type of determining first conventional burst is GMSK, carry out the GMSK demodulation, and demodulation sign Demod_Flag is changed to GMSK.

In step S104, be not more than in the composite noise variance of 8PSK under the situation of composite noise variance of GMSK, comprise following processing: the modulation type of determining first conventional burst is 8PSK, carries out the 8PSK demodulation, and Demod_Flag is changed to 8PSK.In step S106, comprise following processing: after first conventional burst demodulation is finished, determine the modulation type of follow-up three conventional bursts, and follow-up three conventional bursts are carried out demodulation according to modulation type according to Demod_Flag.

Particularly, Fig. 2 is the basic schematic diagram of channel model of mobile communication system.What band receiver of base received is the data of coming through the wireless channel oral instructions, these data are at first carried out the judgement of modulation type by the modulation type module to many antennas baseband I, the Q signal that receives, carrying out diversity according to resulting modulation type then merges and demodulation, result after the demodulation delivers to the decoding that the channel decoding module is carried out channel again through after the deinterleaving.For packet traffic channel, a data block comprises 4 continuous NB, the demodulation result of 4 NB need be outputed in deinterleaving and the decoder.

Fig. 3 is the diagrammatic sketch of the data format of the conventional burst in the EDGE system.For NB, its information is divided into two groups of each 58 symbols, and wherein 57 is data, and another one represents that for stealing flag of frame these data are user data or signaling in the CS business.Between this two segment data, insert 26 training sequence, be used for estimating channel parameter and Timing Advance.The tail bit of 3 " 0 " is added on the both sides of message segment.The NB data time of 8.25 arranged at last, do not send out signal any, as the protection section of adjacent time-slots.NB can be with GMSK or 8PSK modulation signal.

Fig. 4 is according to the many antenna detection GMSK of the embodiment of the invention and the flow chart of 8PSK modulation type.In the EDGE system, for received signal, signal model can be expressed as: ${\tilde{y}}_i\left(k\right)=\underset{p=0}{\overset{M-1}{\mathrm{\&Sigma;}}}{\tilde{h}}_i\left(p\right)\&CenterDot;x(k-p)+n_i\left(k\right),$ Wherein,

Be the received signal on i the antenna, k is the symbolic point position, 1≤i≤N wherein, and N is the antenna number, real system can be 1,2,4 etc.The signal of x (k) for sending, h _i(k) be channel parameter synthetic on i the antenna, n _i(k) be noise, M is an actual channel disperse length.

At first need the signal on each antenna among first NB in the upstream packet business datum piece is carried out the estimation of RSSI.Can in certain window ranges, calculate received signal energy and, and adopt the mode table look-up to obtain the value of RSSI.If the RSSI value on this antenna is less than certain threshold value Threshold, that is: RSSI＜Threshold, the signal of this antenna can be ignored so, does not carry out subsequent treatment.Wherein Threshold can be set to fixed value, for example Threshold=-120.

If the RSSI value on this antenna greater than Threshold, then needs to calculate respectively the composite noise variance of GMSK and 8PSK.For on i the antenna, at first carry out the symbol upset of GMSK and handle, promptly $y_i^{\mathrm{GMSK}}\left(k\right)={\tilde{y}}_i\left(k\right)\&CenterDot;e^{-\mathrm{jk\&pi;}/2},$ Upset is carried out channel parameter estimation after finishing.Channel parameter estimation can adopt the relevant method of sliding, and promptly utilizes training sequence to slide to be correlated with to obtain the parameter of channel.Formula is: $h_i^{\mathrm{GMSK}}\left(k\right)=\frac{1}{L_h}\underset{p=0}{\overset{L_h-1}{\mathrm{\&Sigma;}}}{y}_i^{\mathrm{GMSK}}\left(p\right)\&CenterDot;a(k+p),$ Wherein,

The estimated value of channel parameter when handling for GMSK, the scope of k are [0, M-1], and M is an actual channel disperse length, and a (k) is a training sequence, and L _hFor estimating the channel parameter Len req, be generally less than the length of training sequence.

After the GMSK of this antenna finished dealing with, the 8PSK that carries out this antenna handled, and carried out the symbol upset at first equally and handled, and computing formula is: ${\mathrm{<figure-callout\; id="8"\; label="y\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">y</figure-callout>}}_i^{}\left(k\right)={\tilde{y}}_i\left(k\right)\&CenterDot;e^{-\mathrm{<figure-callout\; id="3"\; label="j"\; filenames="A200710145240E00192.png,A200710145240E00211.png"\; state="\{\{state\}\}">j</figure-callout>}3\mathrm{k\&pi;}/8},$ Equally carry out channel estimating with the processing of GMSK then.Channel parameter estimation value when 8PSK handles is

Formula is: $h_i^{8\mathrm{PSK}}\left(k\right)=\frac{1}{L_h}\underset{p=0}{\overset{L_h-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="8"\; label="y\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">y</figure-callout>}}_i^{}\left(p\right)\&CenterDot;a(k+p),$ When the GMSK of all N antenna handle and 8PSK handle all finish after, carry out the composite noise variance calculating of GMSK and 8PSK.

Wherein, the composite noise variance computing formula of GMSK is: $Q_{\mathrm{GMSK}}=\frac{1}{N\&CenterDot;N_{\mathrm{\&sigma;}}}\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=0}{\overset{N_{\mathrm{\&sigma;}}-1}{\mathrm{\&Sigma;}}}{|y_i^{\mathrm{GMSK}}\left(k\right)-\underset{j=0}{\overset{L-1}{\mathrm{\&Sigma;}}}{h}_i^{\mathrm{GMSK}}\left(j\right)\&CenterDot;a(k-j)|}^2,$ Wherein, N is the antenna number, N _σFor carrying out the training sequence number that the composite noise variance is calculated,

Be the signal after the upset processing,

Be the estimated channel parameter, and a (k) is a training sequence.

The composite noise variance computing formula of 8PSK is: ${\mathrm{<figure-callout\; id="8"\; label="Q"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{8\mathrm{PSK}}=\frac{1}{N\&CenterDot;N_{\mathrm{\&sigma;}}}\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=0}{\overset{N_{\mathrm{\&sigma;}}-1}{\mathrm{\&Sigma;}}}{|{\mathrm{<figure-callout\; id="8"\; label="y\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">y</figure-callout>}}_i^{}\left(k\right)-\underset{j=0}{\overset{L-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="8"\; label="h\; i"\; filenames="A200710145240E00211.png,A200710145240E00212.png"\; state="\{\{state\}\}">h</figure-callout>}}_i^{}\left(j\right)\&CenterDot;a(k-j)|}^2,$ Wherein, N is the antenna number, N _σFor carrying out the training sequence number that the composite noise variance is calculated,

Be the signal after the upset processing,

Be the estimated channel parameter, and a (k) is a training sequence.

After the composite noise variance calculating of many antennas is finished, both are judged, if Q _8PSKQ _GMSK, the modulation type of then judging current NB is GMSK, carries out the GMSK demodulation, and to put Demod_Flag be GMSK.Otherwise, then carry out the 8PSK demodulation, and to put Demod_Flag be 8PSK.

After first NB demodulation in the uplink data block is finished, need judge the demodulation mode of follow-up 3 NB according to the Demod_Flag that preserves.If Demod_Flag equals GMSK, so follow-up 3 NB carry out the GMSK demodulation.Otherwise then follow-up 3 NB carry out the 8PSK demodulation.To deliver to decoder after the deinterleaving of 4 NB demodulation result at last.

Fig. 5 adopts many antenna detection GMSK and 8PSK modulation type method, the schematic diagram of the performance curve under TU50 according to the embodiment of the invention, when reality transmission modulation type is GMSK.As shown in Figure 5, when adopting double antenna to carry out the modulation type detection, the probability that erroneous judgement occurs will be much smaller than the traditional detection method of single antenna.If as antenna number N〉2, Wu Pan probability will be littler so.

Fig. 6 adopts many antenna detection GMSK and 8PSK modulation type method according to the embodiment of the invention, when reality sends modulation type and is 8PSK, the schematic diagram of the performance curve under city model TU50 (50 represent the speed of travelling carriage be 50km/h).The same with Fig. 5, as shown in Figure 6, when adopting double antenna to carry out the modulation type detection, the probability that erroneous judgement occurs will be much smaller than the traditional detection method of single antenna.If as antenna number N〉2, Wu Pan probability can be littler so.

In sum, the present invention is directed to the EDGE system, propose a kind of method that simply and effectively detects GMSK and 8PSK modulation type.Promptly first NB in the upstream packet business datum piece is carried out the calculating of GMSK and 8PSK composite noise variance, and judge modulation type according to the composite noise variance based on many antennas.Simultaneously, according to the modulation type among first NB, determine the demodulation mode of other 3 NB in the uplink data block.It has lowered computation complexity greatly under the prerequisite that satisfies the mobile communication system protocol specification, guaranteed the performance of baseband system simultaneously.

Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1. a method that is used for the multi-antenna modulate type detection of EDGE system is characterized in that, may further comprise the steps:

Step 1 for first the conventional burst in the upstream packet business datum piece, is calculated the composite noise variance of GMSK of many antennas and the composite noise variance of 8PSK respectively;

Step 2 compares the composite noise variance of described GMSK and the composite noise variance of described 8PSK, and determines the modulation type of described first conventional burst according to comparative result; And

Step 3 is determined the modulation type of follow-up three conventional bursts according to the modulation type of described first conventional burst.

2. method according to claim 1 is characterized in that, described step 1 comprises:

Calculate the received signal strength indicator value on each antenna in described many antennas respectively; And

Judge that whether described received signal strength indicator value is greater than predetermined threshold, if greater than described predetermined threshold, then the signal on the pairing antenna of described received signal strength indicator value is carried out GMSK processing and 8PSK processing respectively, otherwise, the signal on the described antenna ignored.

3. method according to claim 2 is characterized in that, described GMSK handles and comprises:

Signal on the antenna is carried out-signal after pi/2 symbol upset is handled and upset handled carries out channel parameter estimation.

4. method according to claim 3 is characterized in that, adopts the slip correlation technique to carry out described channel parameter estimation, calculates by following formula:

$h_i^{\mathrm{GMSK}}\left(k\right)=\frac{1}{L_h}\underset{p=0}{\overset{L_h-1}{\mathrm{\&Sigma;}}}{y}_i^{\mathrm{GMSK}}\left(p\right)\&CenterDot;a(k+p),$

Wherein,

The estimated value of channel parameter when handling for GMSK,

Be the signal after upset is handled, the scope of k is [0, M-1], and M is an actual channel disperse length, and a (k) is a training sequence, and L _hFor estimating the channel parameter Len req, less than the length of described training sequence.

5. method according to claim 2 is characterized in that, described 8PSK handles and comprises:

Signal on the antenna is carried out-3 π/8 symbols upset handle, and the signal after the upset processing is carried out channel parameter estimation.

6. method according to claim 5 is characterized in that, adopts the slip correlation technique to carry out described channel parameter estimation, calculates by following formula:

$h_i^{8\mathrm{PSK}}\left(k\right)=\frac{1}{L_h}\underset{p=0}{\overset{L_h-1}{\mathrm{\&Sigma;}}}{y}_i^{8\mathrm{PSK}}\left(p\right)\&CenterDot;a(k+p),$

Wherein,

The estimated value of channel parameter when handling for 8PSK,

Be the signal after upset is handled, the scope of k is [0, M-1], and M is an actual channel disperse length, and a (k) is a training sequence, and L _hFor estimating the channel parameter Len req, less than the length of described training sequence.

7. according to claim 4 or 6 described methods, it is characterized in that the composite noise variance of described GMSK is calculated by following formula:

$Q_{\mathrm{GMSK}}=\frac{1}{N\&CenterDot;N_{\mathrm{\&sigma;}}}\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=0}{\overset{N_{\mathrm{\&sigma;}}-1}{\mathrm{\&Sigma;}}}{|y_i^{\mathrm{GMSK}}\left(k\right)-\underset{j=0}{\overset{L-1}{\mathrm{\&Sigma;}}}{h}_i^{\mathrm{GMSK}}\left(j\right)\&CenterDot;a(k-j)|}^2,$

Wherein, N is the antenna number, N _σFor carrying out the training sequence number that the composite noise variance is calculated,

Be the signal after the upset processing,

Be the estimated channel parameter, and a (k) is a training sequence.

8. according to claim 4 or 6 described methods, it is characterized in that the composite noise variance of described 8PSK is calculated by following formula:

$Q_{8\mathrm{PSK}}=\frac{1}{N\&CenterDot;N_{\mathrm{\&sigma;}}}\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=0}{\overset{N_{\mathrm{\&sigma;}}-1}{\mathrm{\&Sigma;}}}{|y_i^{8\mathrm{PSK}}\left(k\right)-\underset{j=0}{\overset{L-1}{\mathrm{\&Sigma;}}}{h}_i^{8\mathrm{PSK}}\left(j\right)\&CenterDot;a(k-j)|}^2,$

Wherein, N is the antenna number, N _σFor carrying out the training sequence number that the composite noise variance is calculated,

Be the signal after the upset processing,

Be the estimated channel parameter, and a (k) is a training sequence.

9. method according to claim 1 is characterized in that, described step 2 comprises following processing under the situation of composite noise variance greater than the composite noise variance of described GMSK of described 8PSK:

The modulation type of determining described first conventional burst is GMSK, carries out the GMSK demodulation, and demodulation sign Demod_Flag is changed to GMSK.

10. method according to claim 1 is characterized in that, described step 2 is not more than in the composite noise variance of described 8PSK under the situation of composite noise variance of described GMSK, comprises following processing:

The modulation type of determining described first conventional burst is 8PSK, carries out the 8PSK demodulation, and Demod_Flag is changed to 8PSK.

11., it is characterized in that described step 3 comprises following processing according to claim 9 or 10 described methods:

After described first conventional burst demodulation is finished, determine the modulation type of described follow-up three conventional bursts according to described Demod_Flag, and described follow-up three conventional bursts are carried out demodulation according to described modulation type.

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