CN101577688B - Methods for transmitting and receiving signals, base station and mobile terminal - Google Patents
Methods for transmitting and receiving signals, base station and mobile terminal Download PDFInfo
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- CN101577688B CN101577688B CN2008101059492A CN200810105949A CN101577688B CN 101577688 B CN101577688 B CN 101577688B CN 2008101059492 A CN2008101059492 A CN 2008101059492A CN 200810105949 A CN200810105949 A CN 200810105949A CN 101577688 B CN101577688 B CN 101577688B
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Abstract
The invention provides a method for transmitting uplink signals. The method comprises the following steps: inserting TSC assigned to a first user by a network side into data of the first user to be transmitted; modulating MSK for the data in which the TSC is inserted; rotating the phase for a signal obtained by the modulation according to an angle 1 of the assigned TSC relative to the first user, wherein the difference of the angle 1 and an angle 2 of the TSC relative to a second user is odd number times of 90 degrees, the network side assigns the TSC to the second user based on the same time slot resource for sending data, and the angle 1 is equal to the absolute value of an angle 3 of the TSC assigned to the first user relative to the network side, and the angle 1 and the angle 3 have opposite directions; and transmitting the signal after phase rotation in the same time slot resource. The invention also discloses a method for receiving the uplink signals, methods for transmitting andreceiving downlink signals, a mobile terminal and a base station. By adopting the scheme of the invention, signals can not interfere mutually between two users based on same time slot multiplexing on an uplink/downlink signal transmission link.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of uplink signal sending method, upward signal method of reseptance, downstream signal sending method, downstream signal method of reseptance and a kind of base station, portable terminal.
Background technology
At existing global system for mobile communications (GSM; Global System for MobileCommunication)/ enhanced data rates (EDGE that GSM uses; Enhanced Data rates forGSM Evolution) in the network, a user monopolizes a time interval resource.For making full use of the Radio Resource of existing GSM/EDGE network; Significantly improve the capacity of GSM/EDGE network; The multi-user is with the multiplexing (MUROS of time slot; Multi-User Reusing One Slot) technology is fascinating, and the MUROS technology makes two or more users can use same time interval resource transmission data separately simultaneously, and the capacity of GSM/EDGE system is doubled and redoubled.
The existing scheme of MUROS technology that adopts mainly contains orthogonal sub-channels (OSC, OrthogonalSub-Channel) technology and Traffic Channel (Co-TCH, Co-Traffic Channel) technology altogether.
The principle of OSC technology is: at up link specialized designs and existing 8 training sequence codes (TSC, Training Sequence Codes) 8 new TSC one to one, and make each very low to the correlation of new and old TSC.Two users use the new TSC of an existing TSC and a correspondence respectively in burst (burst) separately; Base station transceiver station (BTS; Base Transceiver Station) receiver adopts interference cancellation techniques; Through these two TSC that correlation is very low; Distinguish these two users' GMSK Gaussian-filtered minimum shift keying (GMSK, Gaussian-filtered Minimum Shift Keying) signal.
Because the signal phasor that above-mentioned two users send in up link is not mutually perpendicular; Thereby with producing mutual interference between these multiplexing two users of time slot; And because close with two multiplexing users of time slot transmitted power; So the interference of this generation also will be a dominant, this is for making the matter worse beyond doubt with disturbing frequently with the adjacent GSM/EDGE system that all can't ignore that disturbs frequently.
The principle of Co-TCH technology is: in two users' of down link the GMSK signal, use lower two the existing TSC (like TSC0 and TSC5) of correlation respectively, BTS sends two users' GMSK signal in same time slot internal linear stack back; Two usefulness adopt the mixed signal after single antenna interference eliminated (SAICSingle Antenna Interference Canceling) technology receives stack per family; Eliminate another user's interference and other interference through the TSC field, to recover GMSK signal separately.
Because the GMSK modulation symbol generally all is a plural number; So the stack that the linear superposition of GMSK signal can not be eliminated between MUROS user is disturbed; Promptly adopt the Co-TCH technology can not guarantee that be mutually orthogonal with two multiplexing users of time slot at the signal of downlink transmission, thereby can not eliminate the phase mutual interference between MUROS user.
Summary of the invention
The present invention provides a kind of up, downstream signal sending method and a kind of portable terminal, base station, with can be on last/downstream signal transmission link, makes signal based on not producing the phase mutual interference between two multiplexing users of time slot.
Accordingly, the present invention also provides a kind of up, downstream signal method of reseptance and a kind of base station, portable terminal.
The uplink signal sending method that the embodiment of the invention proposes comprises: in first user's data to be sent, insert the training sequence that network side is distributed to this first user; To the data to be sent behind the insertion training sequence, carry out Minimum Shift Keying Modulation; Distribute to this first user's training sequence according to network side and locate corresponding angle, exchange the signal to be sent that makes and carry out the phase place rotation first user; Said angle and network side distribute to that send difference that second user's of data training sequence locates corresponding angle second user based on same time interval resource be 90 odd spent and the training sequence of distributing to first user with network side equates and in the opposite direction at the corresponding angle absolute value of network side with first user; In said same time interval resource, send the postrotational signal to be sent of phase place.
The portable terminal that the embodiment of the invention proposes comprises: insert the unit, be used for the data to be sent first user, insert the training sequence that network side is distributed to this first user; Modulating unit is used for carrying out Minimum Shift Keying Modulation to inserting the data to be sent after the unit inserts training sequence; The phase place rotary unit, the training sequence that is used for distributing to this first user according to network side is located corresponding angle first user, and the signal to be sent that the modulation cells modulate is obtained carries out the phase place rotation; Said angle and network side distribute to that send difference that second user's of data training sequence locates corresponding angle second user based on same time interval resource be 90 odd spent and the training sequence of distributing to first user with network side equates and in the opposite direction at the corresponding angle absolute value of network side with first user; Transmitting element is used at said same time interval resource, sends the postrotational signal to be sent of phase place rotary unit phase place.
The upward signal method of reseptance that the embodiment of the invention proposes comprises: receive the multiplexing superposed signal in same time interval resource of first user and second user; Real part in the signal that extraction receives on the odd bits and the imaginary part on the even bit are formed first minimum frequency shift keying signal; And the imaginary part on the odd bits and the real part on the even bit in the signal that extract to receive, form second minimum frequency shift keying signal; In said two minimum frequency shift keying signals, choose the minimum frequency shift keying signal of a minimum frequency shift keying signal as first user, and with the minimum frequency shift keying signal of another minimum frequency shift keying signal that is not selected as second user; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to first user; The training sequence of distributing to first user according to network side is in the first corresponding angle of network side, and first user's minimum frequency shift keying signal is carried out the phase place rotation; And, carry out the MSK demodulation to through the postrotational minimum frequency shift keying signal of phase place; And remove the training sequence that comprises in the data that demodulation obtains, obtain corresponding first user's data; The training sequence of distributing to second user according to network side is in the second corresponding angle of network side, and second user's minimum frequency shift keying signal is carried out the phase place rotation; And, carry out the MSK demodulation to through the postrotational minimum frequency shift keying signal of phase place; And remove the training sequence that comprises in the data that demodulation obtains, obtain corresponding second user's data; The difference of said first angle and second angle is the odd of 90 degree; And first angle and the training sequence of distributing to first user locate that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user.
The base station that the embodiment of the invention proposes, comprising: signal receiving unit is used for receiving the multiplexing superposed signal at same time interval resource of first user and second user; Extract assembled unit, be used for extracting real part and the imaginary part on the even bit on the signal odd bits that signal receiving unit receives, form first minimum frequency shift keying signal; And extract the imaginary part on the odd bits and the real part on the even bit in the signal that signal receiving unit receives, form second minimum frequency shift keying signal; Choose the unit; Be used at said two minimum frequency shift keying signals; Choose the minimum frequency shift keying signal of a minimum frequency shift keying signal as first user, and with the minimum frequency shift keying signal of another minimum frequency shift keying signal that is not selected as second user; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to first user; The phase place rotary unit; The training sequence that is used for distributing to first user according to network side is in the first corresponding angle of network side; Minimum frequency shift keying signal to first user carries out the phase place rotation; And the training sequence of distributing to second user according to network side is in the second corresponding angle of network side, and second user's minimum frequency shift keying signal is carried out the phase place rotation; The difference of said first angle and second angle is the odd of 90 degree; And first angle and the training sequence of distributing to first user locate that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user; Demodulating unit is used for the minimum frequency shift keying signal through postrotational first user of phase place is carried out the MSK demodulation; And, carry out the MSK demodulation to minimum frequency shift keying signal through postrotational second user of phase place; Remove the unit, be used for removing the training sequence that data that corresponding first user's demodulation obtains comprise, obtain corresponding first user's data; And remove the training sequence that comprises in the data that corresponding second user's demodulation obtains, obtain corresponding second user's data.
The downstream signal sending method that the embodiment of the invention proposes comprises:, exchange first minimum frequency shift keying signal that makes and carry out the phase place rotation in the first corresponding angle of network side according to first training sequence of distributing to first user; Said first minimum frequency shift keying signal is through giving in first user's data to be sent, inserting said first training sequence; And, carry out that Minimum Shift Keying Modulation obtains to inserting the data to be sent behind first training sequence; , exchange second minimum frequency shift keying signal that makes and carry out the phase place rotation in the second corresponding angle of network side according to second training sequence of distributing to second user; Said second minimum frequency shift keying signal is through giving in second user's data to be sent, inserting said second training sequence; And, carry out that Minimum Shift Keying Modulation obtains to inserting the data to be sent behind second training sequence; Said first angle and the difference of second angle are that odd and first angle and the training sequence of distributing to first user of 90 degree locates that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user; To pass through postrotational two minimum frequency shift keying signals of phase place superposes; Mixed signal with stack obtains sends to said first user and second user in same time interval resource.
The base station that the embodiment of the invention proposes; Comprise: insert the unit, be used for, insert first training sequence of distributing to first user in first user's data of giving to be sent; And give in second user's data to be sent, insert second training sequence of distributing to second user; Modulating unit is used for carrying out Minimum Shift Keying Modulation to inserting the data to be sent after the unit inserts first training sequence, obtains first minimum frequency shift keying signal; And, carry out Minimum Shift Keying Modulation to inserting the data to be sent after the unit inserts second training sequence, obtain second minimum frequency shift keying signal; The phase place rotary unit is used for according to first angle of first training sequence in the network side correspondence, and first minimum frequency shift keying signal that the modulation cells modulate is obtained carries out the phase place rotation; And according to second angle of second training sequence in the network side correspondence, second minimum frequency shift keying signal that the modulation cells modulate is obtained carries out the phase place rotation; Said first angle and the difference of second angle are that odd and first angle and the training sequence of distributing to first user of 90 degree locates that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user; Superpositing unit is used for postrotational two minimum frequency shift keying signals of process phase place rotary unit phase place are superposeed; Transmitting element is used for mixed signal that superpositing unit stack is obtained, in same time interval resource, sends to said first user and second user.
The downstream signal method of reseptance that the embodiment of the invention proposes comprises: receive the signal in the multiplexing same time interval resource that first user data and second user data arranged; Real part in the signal that extraction receives on the odd bits and the imaginary part on the even bit are formed first minimum frequency shift keying signal; And the imaginary part on the odd bits and the real part on the even bit in the signal that extract to receive, form second minimum frequency shift keying signal; In said two minimum frequency shift keying signals, choose a minimum frequency shift keying signal; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to this first user; Locate corresponding angle according to the training sequence of distributing to first user first user, the said minimum frequency shift keying signal of choosing is carried out the phase place rotation; The said training sequence of distributing to first user is located corresponding angle first user, is 90 odd spent with difference that the training sequence of distributing to second user is located corresponding angle second user and equates and in the opposite direction at the corresponding angle absolute value of network side with the training sequence of distributing to first user; And to carrying out the MSK demodulation through the postrotational minimum frequency shift keying signal of phase place; And remove the training sequence that comprises in the data that demodulation obtains, obtain corresponding said first user's data.
The portable terminal that the embodiment of the invention proposes, comprising: signal receiving unit is used for receiving the multiplexing signal that the same time interval resource of first user data and second user data is arranged; Extract assembled unit, be used for extracting real part and the imaginary part on the even bit on the signal odd bits that signal receiving unit receives, form first minimum frequency shift keying signal; And extract the imaginary part on the odd bits and the real part on the even bit in the signal that signal receiving unit receives, form second minimum frequency shift keying signal; Signal is chosen the unit, is used for choosing a minimum frequency shift keying signal extracting two minimum frequency shift keying signals that assembled unit is combined into; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to this first user; The phase place rotary unit is used for locating corresponding angle according to the training sequence of distributing to first user first user, and the said minimum frequency shift keying signal of choosing is carried out the phase place rotation; The said training sequence of distributing to first user is located corresponding angle first user, and being 90 odd spent and the training sequence of distributing to first user with network side with difference that the training sequence of distributing to second user is located corresponding angle second user equates and in the opposite direction at the corresponding angle absolute value of network side; Demodulating unit is used for carrying out the MSK demodulation through the postrotational minimum frequency shift keying signal of phase place rotary unit phase place; Remove the unit, be used for removing the training sequence that data that the demodulating unit demodulation obtains comprise, obtain corresponding said first user's data.
Up, downstream signal delivery plan that the embodiment of the invention proposes; Through signal to be sent, carry out MSK (MSK, Minimum Shift Keying) modulation respectively with corresponding two users; And at least one signal in two signals after the modulation is carried out phase place rotate; Make that the signal after two modulation is mutually orthogonal, at same time slot two mutually orthogonal signals are sent then, thus can be on last/downstream signal transmission link; Erasure signal is based on the phase mutual interference between two multiplexing users of time slot, to improve significant performance gain.
Description of drawings
Fig. 1 a is the schematic flow sheet that the embodiment of the invention proposes uplink signal sending method;
Fig. 1 b is the up link MS transmitter principle block diagram that the embodiment of the invention one proposes;
Fig. 1 c is the structural representation of first kind of portable terminal of embodiment of the invention proposition;
Fig. 1 d is the schematic flow sheet of the upward signal method of reseptance of embodiment of the invention proposition;
Fig. 1 e is the structural representation of first kind of base station of embodiment of the invention proposition;
Fig. 2 a is the schematic flow sheet of the downstream signal sending method of embodiment of the invention proposition;
Fig. 2 b is the down link BTS transmitter principle block diagram that the embodiment of the invention two proposes;
Fig. 2 c is the structural representation of second kind of base station of embodiment of the invention proposition;
Fig. 3 a is the schematic flow sheet of the downstream signal method of reseptance of embodiment of the invention proposition;
Fig. 3 b is the theory diagram of the MS receiver of the embodiment of the invention three propositions;
Fig. 3 c is the structural representation of second kind of portable terminal of embodiment of the invention proposition;
Fig. 4 a is the diagram in the checking of awgn channel MUROS user phase shift overlaying scheme link level performance;
Fig. 4 b is the diagram in the checking of TU3 channel MUROS user phase shift overlaying scheme link level performance;
Fig. 5 a is the process sketch map of GMSK modulation in the prior art;
Fig. 5 b is the sketch map of Gauss's formed filter impulse response.
Embodiment
The embodiment of the invention propose on/the downstream signal delivery plan is: corresponding two users' signal to be sent is carried out the MSK modulation respectively; And at least one signal in two signals after will modulating carries out the phase place rotation; Make that the signal after said two modulation is mutually orthogonal, and two signals of quadrature are sent at same time slot.
Below in conjunction with Figure of description embodiment of the present invention is described.
Fig. 1 a is the schematic flow sheet of the uplink signal sending method of embodiment of the invention proposition, and concrete process description is following:
Step 11: in first user's data to be sent, insert the training sequence that network side is distributed to this first user, said first user and second user send data based on same time interval resource;
Two users adopt the MUROS technology, and match when multiplexing in the crack at the same time, and network side is distributed to this each self-corresponding training sequence of two users respectively;
Step 12:, carry out Minimum Shift Keying Modulation to the data to be sent behind the insertion training sequence;
Step 13: the training sequence of distributing to this first user according to network side is located corresponding angle first user, exchanges the signal to be sent that makes and carries out the phase place rotation; To be the odd of 90 degree and the training sequence of distributing to first user with network side equate and in the opposite direction at the corresponding angle absolute value of network side the difference that the training sequence that said angle and network side are distributed to said second user is located corresponding angle second user;
Store the angle that the map network side is distributed to this user's training sequence at the user place; Accordingly, also store the angle that correspondence is distributed to this user's training sequence at network side; And said angle of locating to store the user and angle in network side storing, the absolute value equal direction is opposite.
For example can only carry out the phase place rotation of pi/2 to one of them signal; It is pi/2 in the angle that the user locates correspondence that a training sequence promptly is set, and it is 0 that another training sequence is located corresponding angle the user;
Can certainly carry out θ to one of them signal
1The phase place rotation of angle is carried out θ to another signal
2The phase place rotation of angle, said θ
1-θ
2=90 ° * n, n is an odd number; It is θ in the angle that the user locates correspondence that a training sequence promptly is set
1, it is θ that another training sequence is located corresponding angle the user
2
Step 14: in said same time interval resource, send the postrotational signal to be sent of phase place;
Step 15: two signals that send at same time interval resource form the mixing superposed signal aloft.
With a concrete embodiment upward signal delivery plan that the present invention proposes is described below; Carry out the phase place rotation of pi/2 among the following embodiment with signal to a user; Another user's signal is not done and is rotated to be example explanation; Promptly locating corresponding angle with a user's training sequence this user is pi/2, and it is 0 to explain that another user's training sequence is located corresponding angle this user; Shown in Fig. 1 b, the theory diagram of up link travelling carriage (MS, the Mobile Station) transmitter that proposes for the embodiment of the invention one.
Among Fig. 1 b, user 1 is during with user's 2 bursts, and two MS transmitters to should two users insert TSC2 at first respectively in user 1 data to be sent, in user 2 data to be sent, insert TSC0; Because the correlation of TSC0 and TSC2 is lower; So can come to identify respectively two users' data to be sent with these two training sequence TSC 0 and TSC2; Certainly as long as in user 1 and user 2 data to be sent separately, insert different TSC, can distinguish these two users data to be sent separately, still in order to make two data to be sent distinguish more easily; The cross correlation measure of two TSC that general requirement is inserted is lower than pre-set threshold, and (said TSC is that network side distributes; Promptly two users adopt the MUROS technology, and when pairing was sent signal at same time slot, network side was these two user's distribution T SC).
Then, said two MS transmitters carry out the MSK modulation to the data behind two insertion TSC respectively; MSK modulation obtains is ± 1 with ± sequence that i alternately occurs, this is big characteristics of MSK modulation signal.
One of them user's transmitter carries out the pi/2 phase rotation to the MSK modulation signal of oneself, and another user's transmitter does not carry out the phase place rotation to the MSK modulation signal of oneself; Thereby make that two MSK modulation signals are mutually orthogonal;
Subsequently, two MS transmitters carry out over-sampling and D/A with postrotational two MSK modulation signals respectively (D/A Digital/Analog) after the conversion, send at same time slot;
Two users' signal is formed naturally mixed signal when transmit in the crack at the same time.
The portable terminal that the embodiment of the invention proposes is shown in Fig. 1 c; Comprise: insert unit 101; Be used for the data to be sent first user, insert the training sequence that network side is distributed to this first user, said first user and second user send data based on same time interval resource; Modulating unit 102 is used for carrying out Minimum Shift Keying Modulation to inserting the data to be sent after unit 101 inserts training sequence; Phase place rotary unit 103, the training sequence that is used for distributing to this first user according to network side is modulated the signal to be sent that obtains to modulating unit 102 and is carried out the phase place rotation in the angle that first user locates correspondence; To be the odd of 90 degree and the training sequence of distributing to first user with network side equate and in the opposite direction at the corresponding angle absolute value of network side the difference that the training sequence that said angle and network side are distributed to said second user is located corresponding angle second user; Transmitting element 104 is used at said same time interval resource, sends the postrotational signal to be sent of phase place rotary unit 103 phase places.
It should be noted that; It is different to carry out over-sampling in first MSK modulation back over-sampling of this programme and the GMSK modulated process simultaneously; But the effect of over-sampling is to improve the precision of D/A conversion, and it is to carry out simultaneously with modulation, still after modulation, carries out not influence of systematic function.
In addition, though the Co-TCH technology also can be introduced initial phase shift, different with the present invention program is that it is not that msk signal is carried out the phase shift stack, but the GMSK signal is carried out the phase shift stack.Because the characteristic that the GMSK modulation symbol does not have real number and pure imaginary number alternately to occur; A GMSK modulation symbol generally all is a plural number; Therefore the phase shift of GMSK signal stack can not be eliminated the stack interference between MUROS user; Thereby receiving terminal can't extract wherein any one subscriber signal if do not adopt interference cancellation techniques.
The flow process of the upward signal reception programme that the embodiment of the invention proposes is shown in Fig. 1 d, and concrete process description is following:
Step D11: receive the multiplexing superposed signal in same time interval resource of first user and second user;
Step D12: real part in the signal that extraction receives on the odd bits and the imaginary part on the even bit, form first minimum frequency shift keying signal; And the imaginary part on the odd bits and the real part on the even bit in the signal that extract to receive, form second minimum frequency shift keying signal;
The signal that for example receives is 1+i ,-1+i, TSC0+i*TSC2,1-i......; First minimum frequency shift keying signal of then forming is: 1, and i, TSC0 ,-i......; Second minimum frequency shift keying signal of forming is: i ,-1, i*TSC2,1.......
Step D13: in said two minimum frequency shift keying signals, choose the minimum frequency shift keying signal of a minimum frequency shift keying signal as first user, and with the minimum frequency shift keying signal of another minimum frequency shift keying signal that is not selected as second user; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to first user;
For example, the training sequence that network side is distributed to first user is TSC0, then choose above-mentioned composition first msk signal (1, i; TSC0 ,-i......) as first user's msk signal, and with the second msk signal (i of above-mentioned composition;-1, i*TSC2 is 1......) as second user's msk signal.
Step D14: the training sequence of distributing to first user according to network side is in the first corresponding angle of network side, and first user's minimum frequency shift keying signal is carried out the phase place rotation; And
To through the postrotational minimum frequency shift keying signal of phase place, carry out the MSK demodulation; And remove the training sequence that comprises in the data that demodulation obtains, obtain corresponding first user's data;
Step D15: the training sequence of distributing to second user according to network side carries out the phase place rotation in the second corresponding angle of network side to second user's minimum frequency shift keying signal; And
To through the postrotational minimum frequency shift keying signal of phase place, carry out the MSK demodulation; And remove the training sequence that comprises in the data that demodulation obtains, obtain corresponding second user's data;
Said first angle and the difference of second angle are that odd and first angle and the training sequence of distributing to first user of 90 degree locates that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user.
For example first minimum frequency shift keying signal is: 1, and i, TSC0, first training sequence among-i...... is TSC0; Second minimum frequency shift keying signal is: i, and-1, i*TSC2, second training sequence among the 1...... is TSC2; If it is 0 degree that TSC0 locates corresponding angle first user, it is 90 degree that TSC2 locates corresponding angle second user; TSC0 is 0 degree in the corresponding angle of network side so, and TSC2 is-90 degree in the corresponding angle of network side; Be about to second minimum frequency shift keying signal rotation-90 degree.
In addition, the signal that the BTS receiver can send two users at times carries out the MSK demodulation respectively.
Frequently disturb owing to generally also exist in the signal from the same frequency of other sub-district is adjacent; So can be before each minimum frequency shift keying signal be carried out demodulation; To through postrotational each minimum frequency shift keying signal of phase place, carry out interference eliminated, make to obtain more performance.
The base station that the embodiment of the invention proposes is shown in Fig. 1 e, and comprising: signal receiving unit E101 is used for receiving the multiplexing superposed signal at same time interval resource of first user and second user; Extract assembled unit E102, be used for extracting real part and the imaginary part on the even bit on the signal odd bits that signal receiving unit E101 receives, form first minimum frequency shift keying signal; And extract the imaginary part on the odd bits and the real part on the even bit in the signal that signal receiving unit E101 receives, form second minimum frequency shift keying signal; Choose unit E103; Be used at said two minimum frequency shift keying signals; Choose the minimum frequency shift keying signal of a minimum frequency shift keying signal as first user, and with the minimum frequency shift keying signal of another minimum frequency shift keying signal that is not selected as second user; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to first user; Phase place rotary unit E104; The training sequence that is used for distributing to first user according to network side is in the first corresponding angle of network side; Minimum frequency shift keying signal to first user carries out the phase place rotation; And the training sequence of distributing to second user according to network side is in the second corresponding angle of network side, and second user's minimum frequency shift keying signal is carried out the phase place rotation; The difference of said first angle and second angle is the odd of 90 degree; And first angle and the training sequence of distributing to first user locate that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user; Demodulating unit E105 is used for the minimum frequency shift keying signal through postrotational first user of phase place is carried out the MSK demodulation; And, carry out the MSK demodulation to minimum frequency shift keying signal through postrotational second user of phase place; Remove unit E106, be used for removing the training sequence that data that corresponding first user's demodulation obtains comprise, obtain corresponding first user's data; And remove the training sequence that comprises in the data that corresponding second user's demodulation obtains, obtain corresponding second user's data.
Said base station also comprises: also comprise interference cancellation unit E107, be used for carrying out interference eliminated to through postrotational each minimum frequency shift keying signal of phase place rotary unit E104 phase place.
Below set forth in detail the downstream signal delivery plan that the embodiment of the invention proposes, shown in Fig. 2 a, the schematic flow sheet of the downstream signal sending method that proposes for the embodiment of the invention, concrete process description is following:
Step 21: give in first user's data to be sent, insert first training sequence of distributing to first user;
Step 22: give in second user's data to be sent, insert second training sequence of distributing to second user;
The cross correlation measure of said first training sequence and second training sequence is lower than predefined value, and promptly the correlation of first training sequence and second training sequence is lower.
Step 23: to inserting the data to be sent behind first training sequence, carry out the MSK modulation, obtain first msk signal; And, carry out the MSK modulation to inserting the data to be sent behind second training sequence, obtain second msk signal;
Need to prove, can be earlier the data of inserting behind first training sequence to be sent be carried out the MSK modulation, and then execution in step 22 gives in second user's data to be sent, insert second training sequence of distributing to second user; And the data of inserting behind second training sequence to be sent are carried out the MSK modulation.
Step 24: in the first corresponding angle of network side, exchange first msk signal that makes and carry out the phase place rotation according to first training sequence; , exchange second msk signal that makes and carry out the phase place rotation in the second corresponding angle of network side according to second training sequence; Said first angle and the difference of second angle are that odd and first angle and the training sequence of distributing to first user of 90 degree locates that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user;
For example can only carry out the phase place rotation of pi/2 to one of them signal;
Can certainly carry out θ to one of them signal
1The phase place rotation of angle is carried out the phase place rotation of θ 2 angles to another signal, 2=90 ° * n of said θ 1-θ, and n is an odd number.Can guarantee two users' msk signal quadrature like this, but linear superposition and being independent of each other.
Step 25: will pass through postrotational two msk signals of phase place and superpose;
Step 26: the mixed signal with stack obtains sends to said first user and second user in same time interval resource.
Compare with up link, downlink scenario is different on the order of signal stack and over-sampling, A/D conversion.Because receiver has sampling process corresponding time, thus the order of over-sampling and signal stack be first or after, did not influence for reception.
The flow process that upward signal sends be modulate earlier, rotation, over-sampling, D/A conversion, and then carry out the signal stack aloft.The transmission flow of downstream signal then be modulate earlier, the stack of rotation, signal, and then carry out over-sampling and change with D/A.
With a concrete embodiment downstream signal delivery plan that the present invention proposes is described below; Rotate with the phase place of the signal that sends to a user being carried out pi/2 among the following embodiment; The signal that sends to another user do not done rotate to be example explanation; Shown in Fig. 2 b, the theory diagram of the down link BTS transmitter that proposes for the embodiment of the invention two.
Among Fig. 2 b, when user 1 happened suddenly with user 2, the BTS transmitter inserted TSC2 to be sent giving in user 1 the data at first respectively, inserted TSC0 to be sent giving in user 2 the data; Because the correlation of TSC0 and TSC2 is lower; So can come to identify respectively two user's data of giving to be sent with TSC2 with these two training sequence TSC 0; Certainly as long as give the different TSC of insertion in user 1 and user 2 data separately to be sent; Can distinguish and to be sently give these two users data separately, but in order to make two data to be sent distinguish more easily, the general cross correlation measure of two TSC of insertion that requires is lower than pre-set threshold.
Then, said BTS transmitter carries out the MSK modulation to the data behind two insertion TSC respectively; MSK modulation obtains is ± 1 with ± sequence that i alternately occurs, this is big characteristics of MSK modulation signal.
The BTS transmitter is treated the MSK modulation signal that sends to one of them user and is carried out the pi/2 phase rotation, treats the MSK modulation signal that sends to another user and does not then carry out the phase place rotation; Thereby make that two MSK modulation signals are mutually orthogonal, and the MSK modulation signal of two quadratures is carried out linear superposition; For each stack symbol, two users' modulation symbol respectively accounts for the position of real part and imaginary part, is quadrature, and is independent of each other.
Subsequently, the superposed signal that the BTS transmitter obtains stack sends to user 1 and user 2 at same time slot after carrying out over-sampling and D/A conversion.
The base station that the embodiment of the invention proposes is shown in Fig. 2 c; Comprise: insert unit 201; Be used in first user's data of giving to be sent; First user's first training sequence is distributed in insertion, and gives in second user's data to be sent, inserts second training sequence of distributing to second user; Modulating unit 202 is used for carrying out Minimum Shift Keying Modulation to inserting the data to be sent after unit 201 inserts first training sequence, obtains first minimum frequency shift keying signal; And, carry out Minimum Shift Keying Modulation to inserting the data to be sent after the unit inserts second training sequence, obtain second minimum frequency shift keying signal; Phase place rotary unit 203 is used for according to first angle of first training sequence in the network side correspondence, and first minimum frequency shift keying signal that 202 modulation obtain to modulating unit carries out the phase place rotation; And according to second angle of second training sequence in the network side correspondence, second minimum frequency shift keying signal that 202 modulation obtain to modulating unit carries out the phase place rotation; Said first angle and the difference of second angle are that odd and first angle and the training sequence of distributing to first user of 90 degree locates that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user; Superpositing unit 204 is used for postrotational two minimum frequency shift keying signals of process phase place rotary unit 203 phase places are superposeed; Transmitting element 205 is used for mixed signal that superpositing unit 204 stack is obtained, in same time interval resource, sends to said first user and second user.
Below set forth in detail the downstream signal reception programme that the embodiment of the invention proposes, shown in Fig. 3 a, the schematic flow sheet of the downstream signal method of reseptance that proposes for the embodiment of the invention, concrete process description is following:
Step 30: receive the signal in the multiplexing same time interval resource that first user data and second user data arranged;
Step 31: real part in the signal that extraction receives on the odd bits and the imaginary part on the even bit, form first minimum frequency shift keying signal; And the imaginary part on the odd bits and the real part on the even bit in the signal that extract to receive, form second minimum frequency shift keying signal;
Step 32: in said two minimum frequency shift keying signals, choose a minimum frequency shift keying signal; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to this first user;
Be the TSC that the MS receiver is judged self storage,, choose the corresponding msk signal of that higher TSC of the degree of correlation as the corresponding signal of this MS receiver with the degree of correlation of two TSC that comprise in two msk signals of said composition.
Step 33: locate corresponding angle according to the training sequence of distributing to first user first user, the said minimum frequency shift keying signal of choosing is carried out the phase place rotation; The said training sequence of distributing to first user is located corresponding angle first user, is 90 odd spent with difference that the training sequence of distributing to second user is located corresponding angle second user and equates and in the opposite direction at the corresponding angle absolute value of network side with the training sequence of distributing to first user;
Step 34:, carry out interference eliminated to through the postrotational minimum frequency shift keying signal of phase place;
Frequently disturb owing to generally also exist in the signal,, make to obtain more performance so can introduce interference cancellation techniques from the same frequency of other sub-district is adjacent.
Step 35: to carrying out the MSK demodulation through the postrotational minimum frequency shift keying signal of phase place;
Step 36: the training sequence that comprises in the data that the removal demodulation obtains obtains corresponding said first user's data.
With a concrete embodiment receiving side signal case that the present invention proposes is described below; Among the following embodiment the signal corresponding to a user is carried out-rotation of the phase place of pi/2; Do not rotate to be example explanation to not doing phase place corresponding to another user's signal; Shown in Fig. 3 b, the theory diagram of two MS receivers that propose for the embodiment of the invention three.
Among Fig. 3 b; A/D converter controller (ADC, Analog DigitalControl) in two MS receivers carries out the A/D conversion with the signal that receives; ADC signal to ADC output carries out time sampling; Parity bit is alternately got the real part of time sampled output signal and the msk signal that imaginary part constitutes two users successively, promptly gets the real part of time sampled output signal odd bits and the imaginary part of even bit, is combined into a user's msk signal; Get the imaginary part of time sampled output signal odd bits and the real part of even bit, be combined into another user's msk signal;
Obtain TSC separately in said two msk signals that are combined into;
Based on said two TSC that obtain, user 1 MS receiver is selected the msk signal that sends to self from said two msk signals; User 2 MS receiver is also selected the msk signal that sends to self from said two msk signals; Concrete deterministic process for example can be that the TSC with self storage in said two TSC that obtain and the MS receiver compares, and is the signal that sends to self with the high corresponding msk signal of TSC of the TSC degree of correlation of storage in advance.
Because the above-mentioned signal that receives is when sending; It is the phase place rotation back transmission (being that the less TSC of sequence number is a pi/2 in the corresponding angle of network side) that the corresponding msk signal of user that TSC sequence number among two users is less carries out pi/2; And the bigger corresponding msk signal of user of TSC sequence number is not rotated; So the corresponding relation according to TSC and the phase rotation angle that is used to recover the respective signal phase place (is the corresponding user of TSC0 2; Pairing phase rotation angle is that promptly corresponding angle is-pi/2 the less TSC0 of sequence number at user 2 places; And the corresponding user 1 of TSC2, pairing phase rotation angle is 0; ), two MS transmitters are determined the corresponding respectively phase rotation angle of said two msk signals respectively, and (phase rotation angle that is the msk signal of user's 1 correspondence is 0; The phase rotation angle of the msk signal of user's 2 correspondences is-pi/2);
Based on the said phase rotation angle of determining, user 2 MS receiver to the corresponding msk signals of user 2 carry out-the phase place rotation of pi/2 recovers, and user 1 receiver is not done rotation to user's 1 corresponding msk signal;
Right latter two MS receiver carries out channel estimating respectively; And by each self-corresponding user's demodulator; These two msk signals are carried out demodulation, promptly user's 1 corresponding msk signal is carried out demodulation, user's 2 corresponding msk signals are carried out demodulation by user's 2 demodulators by user's 1 demodulator;
In two data that at last demodulation obtained, each self-contained TSC removes.
Frequently disturb owing to generally also exist in the signal,, make to obtain more performance so the MS receiver can also be introduced interference cancellation techniques before demodulation from the same frequency of other sub-district is adjacent.
The portable terminal that the embodiment of the invention proposes is shown in Fig. 3 c, and comprising: signal receiving unit 301 is used for receiving the multiplexing signal that the same time interval resource of first user data and second user data is arranged; Extract assembled unit 302, be used for extracting real part and the imaginary part on the even bit on the signal odd bits that signal receiving unit 301 receives, form first minimum frequency shift keying signal; And extract the imaginary part on the odd bits and the real part on the even bit in the signal that signal receiving unit 301 receives, form second minimum frequency shift keying signal; Signal is chosen unit 303, is used for choosing a minimum frequency shift keying signal extracting two minimum frequency shift keying signals that assembled unit 302 is combined into; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to this first user; Phase place rotary unit 304 is used for locating corresponding angle according to the training sequence of distributing to first user first user, and the said minimum frequency shift keying signal of choosing is carried out the phase place rotation; The said training sequence of distributing to first user is located corresponding angle first user, and being 90 odd spent and the training sequence of distributing to first user with network side with difference that the training sequence of distributing to second user is located corresponding angle second user equates and in the opposite direction at the corresponding angle absolute value of network side; Demodulating unit 305 is used for carrying out the MSK demodulation through the postrotational minimum frequency shift keying signal of phase place rotary unit 304 phase places; Remove unit 306, be used for removing the training sequence that data that demodulating unit 305 demodulation obtain comprise, obtain corresponding said first user's data.
Said portable terminal also comprises: interference cancellation unit 307 is used for carrying out interference eliminated to through the postrotational minimum frequency shift keying signal of phase place rotary unit 304 phase places.
The scheme that adopts the embodiment of the invention to propose has all been eliminated the influence of dominant (being MUROS pairing user's interference) at the uplink downlink of MUROS, fully because make two subscriber signals become quadrature through phase shift.Under the adjacent frequently situation that interference exists of the same frequency of other sub-district, the present invention can improve the performance of interference cancellation algorithm, because inferior interference (interference of adjacent co-frequency cell) has become dominant, becomes the main target of interference cancellation algorithm;
The present invention program compares with the Co-TCH technical scheme with existing OSC; In up link apparent in view advantage is arranged; Because upgoing O SC technology is with the directly stack and interfering with each other of two users' GMSK signal, have to use interference cancellation techniques at BTS receiver place; Also have superiority at down link,, can not guarantee the orthogonality of two subscriber signals, thereby can not eliminate the phase mutual interference between MUROS user though, be the phase shift stack of carrying out the GMSK signal because the Co-TCH technology can be introduced the phase shift stack.
After following surface analysis adopts the present invention program once, to the influence of link level performance.As shown in Figs. 4a and 4b; Set up gsm system link level simulation platform, additive white Gaussian noise (AWGN, AWGNAdditive White Gaussian Noise) channel and mobile station speed 3 kms/hour typical city (TU3; Typical Urban 3km/h) under the channel; Verified performance of the present invention, in Fig. 4 a and Fig. 4 b, user of traditional gsm system monopolized FER/bit error rate (FER/Raw BER) performance under the time slot situation before the present invention was adopted in the solid line representative; Two users of gsm system were with the FER/Raw BER performance under the time slot multiplexed situation after the present invention was adopted in the dotted line representative; As can be seen from the figure, adopt the present invention program after, two users with the time slot multiplexed situation under; Each user's performance is compared decline all seldom with the situation that single user monopolizes time slot, and this explains with producing reciprocal influence hardly between two multiplexing users of time slot.
Adopt the present invention program; Only needing that the BTS/MS transceiver is carried out the simple software algorithm upgrades; Because existing network GMSK modulation and demodulation algorithm can be supported the MSK modulation, thus the same with OSC, Co-TCH technology, except that the complexity of interference cancellation algorithm introducing; Almost system does not increase complexity, and the present invention's performance under the situation of not introducing interference eliminated also can be superior to OSC, Co-TCH technology.
On the basis of existing network, realize that the present invention only need carry out software algorithm and upgrade.Comprise changing that to establish the over-sampling rate parameter be 1, make the GMSK modulator output MSK modulation signal of existing network, transmitter carries out over-sampling to msk signal, and receiver carries out sampling three parts to received signal corresponding time.GMSK demodulator itself that it should be noted that existing network just can the demodulation msk signal.
Shown in Fig. 5 a, the GMSK signal of existing network is with binary phase shift keying (DBPSK, DifferentialBinary Phase Shift Keying) signal, obtains through Gauss's forming filter.
And over-sampling carries out at Gauss's shaping filter simultaneously, and over-sampling rate generally is made as 4 or 8, and corresponding impulse response is shown in the zone circle or band star curve of Fig. 5 b, and the most GMSK modulation symbols of existing network are not pure imaginary numbers.The present invention is made as 1 with the over-sampling rate parameter of GMSK modulation, its impulse response shown in the curve of band five-pointed star among Fig. 5 b, i.e. ω=[0, pi/2,0], that is h=[0, i, 0].Like this, not stack between adjacent-symbol, obtain be ± 1 with ± MSK modulation sequence that i alternately occurs.
In order to guarantee the quantified precision of D/A conversion, it still is essential that the MSK modulation signal is carried out over-sampling.With the Gauss of existing network be shaped over-sampling different be that the present invention can adopt the oversampler method of linear interpolation, can guarantee the quantified precision of D/A conversion equally.Receiving terminal carries out sampling process corresponding time, select ± 1 with the modulation symbol of ± i as sampled point.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. a uplink signal sending method is characterized in that, comprising:
In first user's data to be sent, insert the training sequence that network side is distributed to this first user;
To the data to be sent behind the insertion training sequence, carry out Minimum Shift Keying Modulation;
Distribute to this first user's training sequence according to network side and locate corresponding angle, exchange the signal to be sent that makes and carry out the phase place rotation first user; Said angle and network side distribute to that send difference that second user's of data training sequence locates corresponding angle second user based on same time interval resource be 90 odd spent and the training sequence of distributing to first user with network side equates and in the opposite direction at the corresponding angle absolute value of network side with first user;
In said same time interval resource, send the postrotational signal to be sent of phase place.
2. the method for claim 1 is characterized in that, the said training sequence of distributing to first user is lower than preset value with the cross correlation measure of distributing to second user's training sequence.
3. a portable terminal is characterized in that, comprising:
Insert the unit, be used for data to be sent, insert the training sequence that network side is distributed to this first user first user;
Modulating unit is used for carrying out Minimum Shift Keying Modulation to inserting the data to be sent after the unit inserts training sequence;
The phase place rotary unit, the training sequence that is used for distributing to this first user according to network side is located corresponding angle first user, and the signal to be sent that the modulation cells modulate is obtained carries out the phase place rotation; Said angle and network side distribute to that send difference that second user's of data training sequence locates corresponding angle second user based on same time interval resource be 90 odd spent and the training sequence of distributing to first user with network side equates and in the opposite direction at the corresponding angle absolute value of network side with first user;
Transmitting element is used at said same time interval resource, sends the postrotational signal to be sent of phase place rotary unit phase place.
4. a upward signal method of reseptance is characterized in that, comprising:
Receive the multiplexing superposed signal in same time interval resource of first user and second user;
Real part in the signal that extraction receives on the odd bits and the imaginary part on the even bit are formed first minimum frequency shift keying signal; Imaginary part in the signal that extraction receives on the odd bits and the real part on the even bit are formed second minimum frequency shift keying signal;
In said two minimum frequency shift keying signals, choose the minimum frequency shift keying signal of a minimum frequency shift keying signal as first user, and with the minimum frequency shift keying signal of another minimum frequency shift keying signal that is not selected as second user; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to first user;
The training sequence of distributing to first user according to network side is in the first corresponding angle of network side, and first user's minimum frequency shift keying signal is carried out the phase place rotation; And
To through the postrotational minimum frequency shift keying signal of phase place, carry out the MSK demodulation; And remove the training sequence that comprises in the data that demodulation obtains, obtain corresponding first user's data;
The training sequence of distributing to second user according to network side is in the second corresponding angle of network side, and second user's minimum frequency shift keying signal is carried out the phase place rotation; And
To through the postrotational minimum frequency shift keying signal of phase place, carry out the MSK demodulation; And remove the training sequence that comprises in the data that demodulation obtains, obtain corresponding second user's data;
Said first angle and the difference of second angle are that odd and first angle and the training sequence of distributing to first user of 90 degree locates that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user.
5. method as claimed in claim 4 is characterized in that, before each minimum frequency shift keying signal is carried out demodulation, also comprises: to through postrotational each minimum frequency shift keying signal of phase place, carry out interference eliminated.
6. a base station is characterized in that, comprising:
Signal receiving unit is used for receiving the multiplexing superposed signal at same time interval resource of first user and second user;
Extract assembled unit, be used for extracting real part and the imaginary part on the even bit on the signal odd bits that signal receiving unit receives, form first minimum frequency shift keying signal; And extract the imaginary part on the odd bits and the real part on the even bit in the signal that signal receiving unit receives, form second minimum frequency shift keying signal;
Choose the unit; Be used at said two minimum frequency shift keying signals; Choose the minimum frequency shift keying signal of a minimum frequency shift keying signal as first user, and with the minimum frequency shift keying signal of another minimum frequency shift keying signal that is not selected as second user; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to first user;
The phase place rotary unit; The training sequence that is used for distributing to first user according to network side is in the first corresponding angle of network side; Minimum frequency shift keying signal to first user carries out the phase place rotation; And the training sequence of distributing to second user according to network side is in the second corresponding angle of network side, and second user's minimum frequency shift keying signal is carried out the phase place rotation; The difference of said first angle and second angle is the odd of 90 degree; And first angle and the training sequence of distributing to first user locate that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user;
Demodulating unit is used for the minimum frequency shift keying signal through postrotational first user of phase place is carried out the MSK demodulation; And, carry out the MSK demodulation to minimum frequency shift keying signal through postrotational second user of phase place;
Remove the unit, be used for removing the training sequence that data that corresponding first user's demodulation obtains comprise, obtain corresponding first user's data; And remove the training sequence that comprises in the data that corresponding second user's demodulation obtains, obtain corresponding second user's data.
7. base station as claimed in claim 6 is characterized in that, also comprises interference cancellation unit, is used for carrying out interference eliminated to through postrotational each minimum frequency shift keying signal of phase place rotary unit phase place.
8. a downstream signal sending method is characterized in that, comprising:
, exchange first minimum frequency shift keying signal that makes and carry out the phase place rotation in the first corresponding angle of network side according to first training sequence of distributing to first user; Said first minimum frequency shift keying signal is through giving in first user's data to be sent, inserting said first training sequence; And, carry out that Minimum Shift Keying Modulation obtains to inserting the data to be sent behind first training sequence;
, exchange second minimum frequency shift keying signal that makes and carry out the phase place rotation in the second corresponding angle of network side according to second training sequence of distributing to second user; Said second minimum frequency shift keying signal is through giving in second user's data to be sent, inserting said second training sequence; And, carry out that Minimum Shift Keying Modulation obtains to inserting the data to be sent behind second training sequence; Said first angle and the difference of second angle are that odd and first angle and the training sequence of distributing to first user of 90 degree locates that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user;
To pass through postrotational two minimum frequency shift keying signals of phase place superposes;
Mixed signal with stack obtains sends to said first user and second user in same time interval resource.
9. method as claimed in claim 8 is characterized in that, the cross correlation measure of said first training sequence and second training sequence is lower than preset value.
10. a base station is characterized in that, comprising:
Insert the unit, be used for, insert first training sequence of distributing to first user, and give in second user's data, insert second training sequence of distributing to second user to be sent in first user's data of giving to be sent;
Modulating unit is used for carrying out Minimum Shift Keying Modulation to inserting the data to be sent after the unit inserts first training sequence, obtains first minimum frequency shift keying signal; And, carry out Minimum Shift Keying Modulation to inserting the data to be sent after the unit inserts second training sequence, obtain second minimum frequency shift keying signal;
The phase place rotary unit is used for according to first angle of first training sequence in the network side correspondence, and first minimum frequency shift keying signal that the modulation cells modulate is obtained carries out the phase place rotation; And according to second angle of second training sequence in the network side correspondence, second minimum frequency shift keying signal that the modulation cells modulate is obtained carries out the phase place rotation; Said first angle and the difference of second angle are that odd and first angle and the training sequence of distributing to first user of 90 degree locates that corresponding angle absolute value equates and in the opposite direction first user, and it is equal and in the opposite direction that second angle and the training sequence of distributing to second user are located corresponding angle absolute value second user;
Superpositing unit is used for postrotational two minimum frequency shift keying signals of process phase place rotary unit phase place are superposeed;
Transmitting element is used for mixed signal that superpositing unit stack is obtained, in same time interval resource, sends to said first user and second user.
11. a downstream signal method of reseptance is characterized in that, comprising:
Receive the signal in the multiplexing same time interval resource that first user data and second user data arranged;
Real part in the signal that extraction receives on the odd bits and the imaginary part on the even bit are formed first minimum frequency shift keying signal; And
Imaginary part in the signal that extraction receives on the odd bits and the real part on the even bit are formed second minimum frequency shift keying signal;
In said two minimum frequency shift keying signals, choose a minimum frequency shift keying signal; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to this first user;
Locate corresponding angle according to the training sequence of distributing to first user first user, the said minimum frequency shift keying signal of choosing is carried out the phase place rotation; The said training sequence of distributing to first user is located corresponding angle first user, is 90 odd spent with difference that the training sequence of distributing to second user is located corresponding angle second user and equates and in the opposite direction at the corresponding angle absolute value of network side with the training sequence of distributing to first user; And
To carrying out the MSK demodulation through the postrotational minimum frequency shift keying signal of phase place; And
The training sequence that comprises in the data that the removal demodulation obtains obtains corresponding said first user's data.
12. method as claimed in claim 11 is characterized in that, before carrying out demodulation, also comprises:, carry out interference eliminated to through the postrotational minimum frequency shift keying signal of phase place.
13. a portable terminal is characterized in that, comprising:
Signal receiving unit is used for receiving the multiplexing signal that the same time interval resource of first user data and second user data is arranged;
Extract assembled unit, be used for extracting real part and the imaginary part on the even bit on the signal odd bits that signal receiving unit receives, form first minimum frequency shift keying signal; And extract the imaginary part on the odd bits and the real part on the even bit in the signal that signal receiving unit receives, form second minimum frequency shift keying signal;
Signal is chosen the unit, is used for choosing a minimum frequency shift keying signal extracting two minimum frequency shift keying signals that assembled unit is combined into; Training sequence that comprises in the said minimum frequency shift keying signal of choosing and network side are distributed to first user's the training sequence degree of correlation, are higher than the training sequence degree of correlation that the training sequence that comprises in another minimum frequency shift keying signal that is not selected and network side are distributed to this first user;
The phase place rotary unit is used for locating corresponding angle according to the training sequence of distributing to first user first user, and the said minimum frequency shift keying signal of choosing is carried out the phase place rotation; The said training sequence of distributing to first user is located corresponding angle first user, and being 90 odd spent and the training sequence of distributing to first user with network side with difference that the training sequence of distributing to second user is located corresponding angle second user equates and in the opposite direction at the corresponding angle absolute value of network side;
Demodulating unit is used for carrying out the MSK demodulation through the postrotational minimum frequency shift keying signal of phase place rotary unit phase place;
Remove the unit, be used for removing the training sequence that data that the demodulating unit demodulation obtains comprise, obtain corresponding said first user's data.
14. portable terminal as claimed in claim 13 is characterized in that, also comprises interference cancellation unit, is used for carrying out interference eliminated to through the postrotational minimum frequency shift keying signal of phase place rotary unit phase place.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001127817A (en) * | 1999-10-27 | 2001-05-11 | Icom Inc | Msk modulator, digital signal generator, msk modulating method and recording medium |
| CN101035376A (en) * | 2006-03-03 | 2007-09-12 | 阿尔卡特朗讯 | Method for performing active cancellation of inter-cell interference in a cellular wireless access system |
| CN101155170A (en) * | 2006-09-28 | 2008-04-02 | 阿尔卡特朗讯 | Method for improving inter cell interference cancellation in an cellular radio communication system and corresponding base station and subscriber station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001127817A (en) * | 1999-10-27 | 2001-05-11 | Icom Inc | Msk modulator, digital signal generator, msk modulating method and recording medium |
| CN101035376A (en) * | 2006-03-03 | 2007-09-12 | 阿尔卡特朗讯 | Method for performing active cancellation of inter-cell interference in a cellular wireless access system |
| CN101155170A (en) * | 2006-09-28 | 2008-04-02 | 阿尔卡特朗讯 | Method for improving inter cell interference cancellation in an cellular radio communication system and corresponding base station and subscriber station |
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