CN102098717B - Method and device for detecting rotation angle and SCPIR by VAMOS user equipment - Google Patents
Method and device for detecting rotation angle and SCPIR by VAMOS user equipment Download PDFInfo
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- CN102098717B CN102098717B CN200910252184XA CN200910252184A CN102098717B CN 102098717 B CN102098717 B CN 102098717B CN 200910252184X A CN200910252184X A CN 200910252184XA CN 200910252184 A CN200910252184 A CN 200910252184A CN 102098717 B CN102098717 B CN 102098717B
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Abstract
The invention discloses a method and device for detecting a rotation angle and an SCPIR (Sub Channel Power Imbalance Ratio) by VAMOS (Voice services over Adaptive Multi-user channels on One Slot) user equipment. In the invention, the rotation angle is detected and verified by the user equipment by utilizing the rotation angle of a GSM (Global System for Mobile Communications) downlink signal and the limit that whether two user Alpha-QPSK downlink modulation signals satisfy the minimum peak-to-average power ratio or not. In the invention, a burst rotation angle and an SCPIR value can be detected by the user equipment without notifying the user equipment by the base station via a signaling so that the signaling overhead is saved; at the same time, the accuracy of the detection is further ensured by verifying whether the SCPIR and an alpha value satisfy the minimum peak-to-average power ratio or not.
Description
Technical field
The present invention relates to the detection technique in the gsm wireless communications field, relate in particular to a kind of VAMOS (Voice services over Adaptive Multi-user Channels on One Slot, the voice service of the adaptive a plurality of subscriber channels of carrying on time slot) the subscriber equipment burst anglec of rotation detect and sub-channel power than the method for (Sub Channel Power Imbalance Ratio, SCPIR) detection.
Background technology
Along with the cost of wireless telecommunications is more and more lower, the user is more and more, causes the demand of wireless telecommunications increasing, and corresponding wireless telecommunications frequency spectrum resource becomes bottleneck gradually.Be faced with the pressure of very severe raising user capacity for the whole world most widely used radio communication standard GSM.In order to alleviate the frequency spectrum pressure of GSM, improve the availability of frequency spectrum, the VAMOS technology has been proposed, also once be called MUROS (Multi-UserReusing One Slot) technology.Two users of VAMOS technical support share time slot of same frequency simultaneously.In the situation that do not increase frequency spectrum and time slot can promote the availability of frequency spectrum one times.The VAMOS technology both can be applied to full rate (FULL RATE) voice also can be applied to half rate (HALF RATE) voice, on both bases, the number of users of support can be doubled.Descending α-QPSK the technology that adopted of VAMOS technology, upper behavior MU-MIMO (Multi-User Multiple Input Multiple Output, multi-user's multiple-input and multiple-output) technology.Fig. 1 is that VAMOS two users share a time slot schematic diagram.The VAMOS technology is just becoming the emphasis of GSM technical research at present.
Adopt the subscriber equipment of VAMOS technology can compatible old GSM user, also can adopt more senior receiver to improve the performance of input.Two users that share a time slot are called the pairing user.Each user in two users of pairing has an independently receiver user.Receiver user can be received two users' of pairing signal, but the signal that only comprises this user for each receiver user is only the signal of final needs, another one pairing user's signal may be done demodulation at receiver, but can make discard processing in follow-up decoding part.In order to take full advantage of the ability of VAMOS hoist capacity, need multiplexing or claim in two users of pairing the senior receiver such as at least one User support SAIC (Single AntennaInterference Cancellation, single antenna interference cancellation).The channel that VAMOS takies two CUs of identical time slot is called two sub-channels.For restituted signal accurately, senior joint detection receiver need to detect the power ratio SCPIR of two sub-channels that take identical time slot.In order to reduce signaling consumption, 3GPP TR45.914 suggestion detects SCPIR voluntarily by subscriber equipment.In order to reduce the requirement of down transmitting power, TR45.914 proposes to select according to user's power ratio tolerance α (Alpha) value the anglec of rotation of downstream signal simultaneously, and α is the arctan function value of two user power ratios of pairing.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that VAMOS subscriber equipment burst anglec of rotation detects and SCPIR detects.Realize that for subscriber equipment the anglec of rotation detects and the detection of SCPIR, and then provide realization possible for advanced joint detection receiver.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of VAMOS subscriber equipment detects the method for the anglec of rotation, and the method comprises:
The restrictive condition that subscriber equipment utilizes VAMOS two pairing user's downstream signal anglecs of rotation and sub-channel power to meet the minimum peak average specific than (SCPIR) detects and the checking anglec of rotation and sub-channel power ratio, and described detection and checking are specially:
A, the anglec of rotation that two pairing users are carried out respectively to training sequence detect, and obtain two pairing users' the anglec of rotation;
B, calculate two pairing users' SCPIR according to obtained two pairing users' rotation angle value;
C, verify whether described SCPIR and the described anglec of rotation meet the requirement of minimum peak average specific, be proved to be successful if meet.
Further, also comprise two pairing users' transmitter module detecting step before described steps A, be specially:
Judge that respectively whether two pairing users enter discontinuous emission (DTX) pattern, if two pairing users do not enter the DTX pattern, perform step A.
Further, in steps A, the method for the acquisition user anglec of rotation is specially:
A1, in receiving signal window, extract training sequence part;
A2, for each angle value in anglec of rotation detection list, adopt the mode of least mean-square error to calculate the signal to noise ratio (SIR) of described training sequence, and result of calculation is sorted;
A3, choose in described result of calculation the testing result value of the maximum corresponding angle value of sir value as this user's rotation angle value.
Further, the SCPIR method of calculating two pairing users described in step B by: according to acquisitions two pairing users' rotation angle value calculate two power ratios of training sequence of matching users, and the SCPIR using the power ratio of training sequence as two pairing users.
Further, the SCPIR method of calculating two pairing users described in step B is: calculate the multipath sum energy Ratios of two pairing users' channel estimating, and the SCPIR using this ratio as two pairing users.
Further, in step C, if described SCPIR and the described anglec of rotation do not meet the requirement of minimum peak average specific, from described anglec of rotation detection list, delete described rotation angle value, again carry out and detect and verification step.
Further, the described anglec of rotation of empirical tests and SCPIR are for receiving processing or the signal demodulation of signal.
Based on said method, the present invention also proposes the device that a kind of VAMOS subscriber equipment detects the anglec of rotation, comprising:
Rotation angle detecting unit, detect for the anglec of rotation of two pairing users being carried out to training sequence, obtains two pairing users' the anglec of rotation;
The SCPIR computing unit, calculate two users' SCPIR for the rotation angle value according to obtained two pairing users;
Whether minimum peak average specific authentication unit, meet the requirement of minimum peak average specific for verifying described SCPIR and the described anglec of rotation, if meet, exports described SCPIR and the described anglec of rotation, for processing or the signal demodulation that receives signal.
Further, described device also comprises: the emission mode judging unit, and for two pairing users' the judgement of emission mode, if determining two pairing users, this module all do not enter the DTX pattern, and notify rotation angle detecting unit to carry out corresponding function.
Further, described rotation angle detecting unit comprises:
Extraction module, for extracting training sequence part in receiving signal window;
The snr computation module, adopt the mode of least mean-square error to calculate the signal to noise ratio (SIR) of described training sequence for each angle value for anglec of rotation detection list, and result of calculation sorted;
Anglec of rotation determination module, for choosing the testing result value of the maximum corresponding angle value of sir value of described result of calculation as this user's rotation angle value.
Further, if described minimum peak average specific authentication unit verifies that described SCPIR and the described anglec of rotation do not meet the requirement of minimum peak average specific, from described anglec of rotation detection list, delete described rotation angle value, and notify described rotation angle detecting unit again to carry out.
Further, described SCPIR computing unit calculates the power ratio of two pairing users' training sequence according to obtain two pairing users' rotation angle value, and the SCPIR using it as two pairing users; Or described SCPIR computing unit calculates described two pairing users' the multipath sum energy Ratios of channel estimating, and the SCPIR using it as two pairing users.
Adopt the method for the invention and device, realized the detection to the anglec of rotation and SCPIR, in the situation that do not need base station signaling subscriber equipment, subscriber equipment can detect the burst anglec of rotation and SCPIR value voluntarily, has saved signaling consumption; The checking that simultaneously by SCPIR and α value, whether meets minimum peak average specific (PeakAverage Ratio, PAR) can further guarantee the accuracy detected.
The accompanying drawing explanation
Fig. 1 is the VAMOS scheme schematic diagram that two users share a time slot of a carrier frequency;
The method flow diagram that Fig. 2 VAMOS subscriber equipment of the present invention anglec of rotation detects and SCPIR detects;
Fig. 3 verifies in one embodiment of the invention whether the anglec of rotation and SCPIR meet the proof diagram of minimum PAR;
Fig. 4 is that the VAMOS subscriber equipment anglec of rotation of the present invention detects and SCPIR structure of the detecting device figure.
Embodiment
Basic thought of the present invention is: the restrictive condition that subscriber equipment utilizes VAMOS two pairing user's downstream signal anglecs of rotation and Alpha-QPSK Corticofugal Modulation of Somatosensory signal to meet the minimum peak average specific detects and verifies that the anglec of rotation and sub-channel power are than (SCPIR).
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is the VAMOS scheme schematic diagram that two users share a time slot of a carrier frequency, in figure, two user MS1 and MS2 take identical carrier frequency, carrier frequency number (Absolute Radio Frequency ChannelNumber, ARFCN) be 160, take identical time slot (Time Slot, TS) be the 3rd time slot, two different training sequences (Time Slot Counter, TSC) of user assignment are respectively 0 and 5.
Scene based on Fig. 1, subscriber equipment is when the demodulated channel data, the final information that only needs the corresponding subchannel of this user of demodulation, but for the interference to this user of the subchannel of eliminating the another one user, need demodulation or know another one user's the information such as power, training sequence, need to be detected and detect to another one user's the anglec of rotation SCPIR of two sub-channels.
Fig. 2 is the method flow diagram that the VAMOS subscriber equipment burst anglec of rotation of the present invention detects and SCPIR detects, and concrete steps are as follows:
Whether step 201: judging that this user corresponding to base station is descending enters discontinuous emission (DiscontinuousTransmission, DTX) pattern, if flow process finishes; Otherwise perform step 202;
Whether the user enters the DTX pattern can effectively be detected by other means by signaling subscriber equipment or subscriber equipment, so DTX information is as known initial conditions of this method.
Be advanced into the DTX pattern under this user, the calculating that this user no longer needs to detect the anglec of rotation and do not need to carry out SCPIR.
Step 202: judge whether another pairing user enters the DTX pattern, if perform step 203; Otherwise perform step 204;
When this user does not enter DTX and the another one user enters DTX, only need to detect this user's the anglec of rotation, corresponding subsequent demodulation is with alone family signal demodulation of the prior art.
Step 203: the anglec of rotation of this user being carried out to training sequence detects, and to make SCPIR be infinitely great, then performs step 208;
Step 204: the anglec of rotation of two pairing users being carried out to training sequence detects, and obtains respectively two pairing users' the anglec of rotation;
When this user and another one user's subchannel does not all enter the DTX state, the SCPIR that needs to detect two users' the anglec of rotation and calculate the two is for the demodulation receiver.
The purpose that detects another one user's the anglec of rotation is to only have the detection another one user's that the correct anglec of rotation of having determined another one user could be correct signal power, has had another one user's signal power could calculate two users' SCPIR.
The several discrete angle value that each user's possible rotation angle value is finite state, the several discrete angle values of finite state are configured for detecting the anglec of rotation detection list of user's anglec of rotation, and each burst need be carried out initialization to anglec of rotation detection list when from step 202, entering this step.
The present invention comprises following step to the detection method of user's the anglec of rotation:
Step1: in receiving signal window, extract training sequence part;
Step2: be as the criterion with the rotation value in anglec of rotation detection list, adopt signal to noise ratio (the Signal Interference Ratio of the mode calculation training sequence of least mean-square error for each angle value in list, SIR), and to result of calculation sorted;
Step3: choose the testing result value of the corresponding angle value of sir value maximum in result as this user's rotation angle value.
The detailed step that detects user's anglec of rotation in one embodiment of the present invention is: suppose that receiving data is c, training sequence is respectively 0 and 5, each user carries out a Minimum Mean Square Error estimation for the possible rotation angle value of each agreement regulation, obtains each user's channel impulse response; Then calculate the energy (S) of signal according to the result of channel impulse response and training sequence convolution; Reception signal e deducts above-mentioned convolution results and is disturbed (I), and the power ratio of S and I is the SIR of respective angles.For each user in two users, choose the rotation angle value of the corresponding rotation angle value of SIR maximum as subsequent detection.
Step 205: according to obtained two pairing users' rotation angle value, calculate two users training sequence power ratio so that obtain two users' SCPIR, and calculate corresponding α value;
Calculate the power ratio of two users' training sequence according to obtained rotation angle value, and using its power ratio as two sub-channels (SCPIR), the training sequence power ratio can directly utilize the multipath sum energy Ratios of two users' channel estimating to replace, so in the present invention, the computational methods of the power ratio of two sub-channels are: calculate the multipath sum energy Ratios of two pairing users' channel estimating, and the SCPIR using this ratio as two pairing users.
Step 206: checking SCPIR and the anglec of rotation (are stipulated by the GSM physical layer protocol, as limited several centrifugal pumps such as the PI/2 in Fig. 3, PI/4, if it is other values that the VAMOS user perspective rotation of agreement regulation is worth optional scope, Fig. 3 need to increase test or the simulation curve of the peak average ratio of other angle rotation values, but do not affect the validity of patent) relation whether meet 3GPP TR45.914 minimum peak average specific (Peak Average Ratio, PAR) requirement, enter step 208 if meet; Otherwise perform step 207;
Fig. 3 verifies in one embodiment of the invention whether the anglec of rotation and SCPIR meet the proof diagram of minimum PAR, α (Alpha) value that the power ratio (SCPIR) of the subchannel that wherein abscissa is same two users is relevant, ordinate is PAR, and the function curve in this proof diagram is α under the different rotary angle obtained through simulator simulation and the function relation curve of PAR.In figure, dotted line is the α of the anglec of rotation while being PI/4 and the function relation curve of PAR, and the solid line in figure is the α of the anglec of rotation while being PI/2 and the function relation curve of PAR.
Take Fig. 3 as example, and according to the agreement regulation, the step of carrying out minimum PAR checking is:
Obtain respectively according to α value corresponding to SCPIR detected two PAR values that rotation angle value is PI/4 and PI/2, find out a value minimum in these two PAR values, if the corresponding anglec of rotation of a value rotation angle value definite with step 203 of this minimum equates, detect correctly, otherwise need to attempt other rotation angle value.
Step 207: if the relation of SCPIR and the anglec of rotation does not meet the PAR requirement, from anglec of rotation detection list, delete current rotation angle value, then perform step 204;
The purpose of deleting current rotation angle value from anglec of rotation detection list is again to select the anglec of rotation of sir value maximum to carry out the checking of step 206 in the remaining possible anglec of rotation.
Step 208: by the anglec of rotation of empirical tests and SCPIR for receiving processing or the signal demodulation of signal.
Fig. 4 is the apparatus structure schematic diagram that VAMOS subscriber equipment of the present invention detects the anglec of rotation, and described device comprises: emission mode judging unit, rotation angle detecting unit, SCPIR computing unit, minimum peak average specific authentication unit.
The emission mode judging unit, for two pairing users' the judgement of emission mode, all do not enter the DTX pattern if this module determines two pairing users, notifies rotation angle detecting unit to carry out corresponding function; Enter the DTX pattern if determine this user, be not rotated the verification step of angle and SCPIR; If determine, this user does not enter the DTX pattern and another pairing user enters, and only need to call the anglec of rotation that rotation angle detecting unit carries out training sequence to this user and detect and get final product, and testing result can be directly used in processing or the signal demodulation of reception signal.
Rotation angle detecting unit, be connected in the emission mode judging unit, for the anglec of rotation of two pairing users being carried out to training sequence, detects, and obtains two pairing users' the anglec of rotation; This unit further comprises: sequential extraction procedures module, snr computation module, anglec of rotation determination module.
The sequential extraction procedures module, for extracting training sequence part in channel estimation window;
The snr computation module, adopt the mode of least mean-square error to calculate the signal to noise ratio (SIR) of described training sequence for each angle value for anglec of rotation detection list, and result of calculation sorted;
Anglec of rotation determination module, for choosing the testing result value of the maximum corresponding angle value of sir value of described result of calculation as this user's rotation angle value.
The SCPIR computing unit, be connected in rotation angle detecting unit, calculates two users' SCPIR for obtain according to rotation angle detecting unit two pairing users' rotation angle value;
Minimum peak average specific authentication unit, be connected in the SCPIR computing unit, be used for verifying whether the SCPIR of SCPIR computing unit acquisition and the anglec of rotation that rotation angle detecting unit obtains meet the requirement of minimum peak average specific, if meet, export described SCPIR and the described anglec of rotation, for processing or the signal demodulation that receives signal.
If described minimum peak average specific authentication unit verifies that described SCPIR and the described anglec of rotation do not meet the requirement of minimum peak average specific, from described anglec of rotation detection list, delete described rotation angle value, and notify described rotation angle detecting unit again to be rotated the detection that angle detects, and again carry out follow-up SCPIR and the verification operation of the anglec of rotation.
The above, be only preferred embodiment of the present invention, is not intended to limit protection range of the present invention.
Claims (10)
1. on time slot, the voice service VAMOS subscriber equipment of the adaptive a plurality of subscriber channels of carrying detects the method for the anglec of rotation, it is characterized in that,
The restrictive condition that subscriber equipment utilizes VAMOS two pairing user's downstream signal anglecs of rotation and sub-channel power to meet the minimum peak average specific than SCPIR detects and the checking anglec of rotation and sub-channel power ratio, and described detection and checking are specially:
A, the anglec of rotation that two pairing users are carried out respectively to training sequence detect, and obtain two pairing users' the anglec of rotation;
B, calculate two pairing users' SCPIR according to obtained two pairing users' rotation angle value;
C, verify whether described SCPIR and the described anglec of rotation meet the requirement of minimum peak average specific, be proved to be successful if meet;
The method that obtains user's anglec of rotation in described steps A is specially:
A1, in receiving signal window, extract training sequence part;
A2, for each angle value in anglec of rotation detection list, adopt the mode of least mean-square error to calculate the signal to noise ratio SIR of described training sequence, and result of calculation is sorted;
A3, choose in described result of calculation the testing result value of the maximum corresponding angle value of sir value as this user's rotation angle value.
2. method according to claim 1, is characterized in that, also comprises two pairing users' transmitter module detecting step before described steps A, is specially:
Judge that respectively whether two pairing users enter discontinuous emission DTX pattern, if two pairing users do not enter the DTX pattern, perform step A.
3. method according to claim 1, it is characterized in that, the SCPIR method of calculating two pairing users described in step B by: according to acquisitions two pairing users' rotation angle value calculate two power ratios of training sequence of matching users, and the SCPIR using the power ratio of training sequence as two pairing users.
4. method according to claim 1, is characterized in that, the SCPIR method of calculating two pairing users described in step B is: calculate the multipath sum energy Ratios of two pairing users' channel estimating, and the SCPIR using this ratio as two pairing users.
5. method according to claim 1, it is characterized in that, in step C, if described SCPIR and the described anglec of rotation do not meet the requirement of minimum peak average specific, from described anglec of rotation detection list, delete described rotation angle value, again carry out and detect and verification step.
6. according to the described method of any one claim in claim 1 to 5, it is characterized in that, the described anglec of rotation of empirical tests and SCPIR are for receiving processing or the signal demodulation of signal.
7. on time slot, the voice service VAMOS subscriber equipment of the adaptive a plurality of subscriber channels of carrying detects the device of the anglec of rotation, it is characterized in that, comprising:
Rotation angle detecting unit, detect for the anglec of rotation of two pairing users being carried out to training sequence, obtains two pairing users' the anglec of rotation;
Sub-channel power, than SCPIR computing unit, is calculated two pairing users' SCPIR for the rotation angle value of two pairing users according to obtained;
Whether minimum peak average specific authentication unit, meet the requirement of minimum peak average specific for verifying described SCPIR and the described anglec of rotation, if meet, exports described SCPIR and the described anglec of rotation, for processing or the signal demodulation that receives signal;
Described rotation angle detecting unit comprises:
Extraction module, for extracting training sequence part in receiving signal window;
The snr computation module, adopt the mode of least mean-square error to calculate the signal to noise ratio SIR of described training sequence for each angle value for anglec of rotation detection list, and result of calculation sorted;
Anglec of rotation determination module, for choosing the testing result value of the maximum corresponding angle value of sir value of described result of calculation as this user's rotation angle value.
8. device according to claim 7, is characterized in that, described device also comprises:
The emission mode judging unit, for two pairing users' the judgement of emission mode, all do not enter discontinuous emission DTX pattern if this module determines two pairing users, notifies rotation angle detecting unit execution corresponding function.
9. device according to claim 7, it is characterized in that, if described minimum peak average specific authentication unit verifies that described SCPIR and the described anglec of rotation do not meet the requirement of minimum peak average specific, from described anglec of rotation detection list, delete described rotation angle value, and notify described rotation angle detecting unit again to carry out.
10. device according to claim 7, is characterized in that, described SCPIR computing unit calculates the power ratio of two pairing users' training sequence according to obtain two pairing users' rotation angle value, and the SCPIR using it as two pairing users; Or described SCPIR computing unit calculates described two pairing users' the multipath sum energy Ratios of channel estimating, and the SCPIR using it as two pairing users.
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| CN101300881A (en) * | 2005-10-31 | 2008-11-05 | 艾利森电话股份有限公司 | Method and arrangement for activity detection in a telecommunication system |
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