A method of reducing peak power to the average transmission power of the mobile station and the device for its implementation

 

(57) Abstract:

In the invention, the decrease of the ratio peak-to-average transmit power of the mobile station in the mobile communication system can be achieved by broadening and modulation data transmission integrated expanding sequence. This sequence generates in response to each element psevdochumoy sequence to get a many of elements, and that the phase difference between every two successive complex elements was 90o. The technical result is a flexible power control, since the transmission power of a mobile generate only linear range of characteristics of the power amplifier. 3 S. and 17 C.p. f-crystals, 7 Il.

The technical field to which the invention relates

The present invention relates in General to mobile communication systems, in particular to a method for reducing the peak power to the average transmission power of the mobile station in the mobile communication system and device for its implementation.

Art

The usual system for mobile communication with mdcr (multiple access code division multiple access) provides services re voice communication, high-speed data transmission, transmission of moving images and browsing the Internet. In this system, the mobile communication line radio consists of a straight line directed from the base station (BS) to mobile station (MS), and a return line pointing from the MS to the BS.

When the zero-crossing during expansion and modulation when transmitting through a return line connection (change of frequency ) peak-to-average transmit power of the mobile station (power transfer) increases, which leads to a re-increase. Again an increase adversely affects the quality of the connection for calls to other subscribers. Therefore, the ratio of peak power to average power is an important factor in the design and operation of power amplifier in MS.

Re the increase appears due to the fact that the characteristic of the power amplifier of the mobile station contains a linear and a nonlinear part. When the power transfer increases, the signal transmission MS due to the nonlinearity characteristics generates interference in the frequency domain of another user, causing the phenomenon of re-increase.

Insurgents in the cell the cell to the corresponding base station with a low power level. Thus, the power transfer can be flexibly adjusted, if the peak-to-average power limit in a certain range. However, to physically reduce the size of the cell the cell is uneconomical, because then you will need more cell for a given region, and for each cell of the cell requires its own equipment for communication.

The invention

Accordingly, the present invention is a device and method for reducing peak power to the average transmission power of the mobile station in the mobile communication system.

Another objective of the present invention is to provide a method of flexible power control of the mobile transmission by limiting the peak power to average power of a mobile transmission within certain limits.

Another object of the present invention is to provide a flexible way of changing the cell size of the cells in the mobile communication system to prevent re-increase.

The next task of the present invention is to provide a method for improving the characteristics of the multipath autocorrelation signal of the other tasks, a device and method, designed to reduce the peak power to average power of a mobile transmission in the mobile communication system. Device and method for expanding data mobile communication integrated expanding sequence. Integrated expanding sequence contains many elements and is generated in response to each element of PN (psevdochumoy) sequence so that the phase difference between every two successive complex elements 90o.

Brief description of drawings

Fig.1 is a block diagram of a mobile station for implementing the method of extension and modulation according to one variant of the present invention;

Fig. 2 is a block diagram of the first variant OFMN (relative phase shift keying) /2, shown in Fig.1;

Fig. 3A and 3B is a set of signals and the phase change in the complex extends the sequences that match the structure of the generator OPMN /2, shown in Fig.2;

Fig. 4 is a block diagram of a second variant of the generator OPMN /2, shown in Fig.1;

Fig. 5A and 5B is a set of signals and the phase change in the integrated expansion sequences in accordance with the structure of the generator OPMN /2, shows the Oia and modulation according to the present invention;

Fig. 7 is a block diagram of a mobile station in the system with sh-mdcr (broadband multiple access code division multiple access), which uses the method of extension and modulation according to the present invention.

Detailed description of preferred embodiments of the invention

Below with reference to the accompanying drawings, describes preferred embodiments of the present invention. In the following description, well-known structures or functions are not described in detail so as not to divert attention from the essence of the present invention.

The present invention provides the following new and distinctive features:

(1) the transmission power of a mobile can be flexibly adjusted by limiting the peak power to average power within certain limits and, therefore, the retention power of the mobile transmit on a linear plot of the characteristics of the power amplifier;

(2) prevent the phase shift of the complex expanding sequence 180o(that is ) to maintain the transmission power of the mobile on the linear plot of characteristics of the power amplifier;

(3) the phase difference between every two consecutive Ko (ie /2) to limit the range of output power filters group spectrum and thereby reduce the peak power to average power of a mobile transmission;

(4) improve the characteristics of the autocorrelation of multipath signal and the characteristics of the cross-correlation relative to other users by re-expansion of the signal that has passed through the integrated expander, expanding sequence RP2generated by the PN generator code.

In this embodiment of the present invention it is important that "OFMN (relative phase shift keying) /2" is not the usual OPMN and is called so because in the complex expanding sequence PNI+jPNQgenerated in the generator OPMN /2, during the time of the passing of one element of expanding sequence phase is changed to /2.

Please refer to Fig.1, which shows a block diagram of a mobile station (MS), which is listed here to describe how extension and modulation data transfer to reduce the peak power to average power of a mobile transmission in accordance with the variants of implementation of the present invention. A complex signal including the I-data (in-phase data and Q-data (I / q data that is shifted by /2), is fed as a first input signal in an integrated expander 2. Generator the e sequence PNIand PNQmoreover , the sequence PNIcomes from a PN generator14. Integrated expanding sequence PNIand PNQserves as the second input signal in an integrated expander 2. This alternative implementation of the present invention differs in that there is no zero-crossing, since the phase difference between every two successive complex elements of a comprehensive expanding sequence (PNIand PNQ) is equal to /2. The structure and operation of the generator OFMN with /2 6 is described in detail below with reference to Fig. 2 through 5B.

In Fig.1 complex extender 2 includes multipliers 8, 10, 12 and 14, as well as the adders 16 and 18 for a comprehensive expansion of the complex signal integrated extender sequences PNIand PNQ. Detailed description of the operation of the integrated extender 2 can be found in the Patent application KR 98-7667.

Multipliers 20-1 and 20-2 multiply the resulting extended common-mode signal XI and advanced quadrature signal XQ is obtained from the integrated expander 2, the sequence PN2generated by the PN generator221, for additional expansion. In this variant appolagies, what sequences PN1and PN2may be followed by a PN sequence, which is formed by the identification code of the user. In this invention, the multiplication of the output signal of the integrated extender 2 on PN2not a mandatory feature.

The output signals of the multipliers 20-1 and 20-2 are filtered with filters group spectrum 22-1 and 22-2 and the gain (GPwith the help of controllers gain 24-1 and 24-2, respectively. Then the mixers 26-1 and 26-2 multiply the output signals of the controllers gain 24-1 and 24-2 to the appropriate carrier, cos(2fct) and sin(2fct), to transform with increasing frequency, and the adder 28 adds the output signals of the mixers 26-1 and 26-2.

According to the present invention improves the characteristics of the multipath autocorrelation signal and the characteristics of the cross-correlation with respect to other users by double-running expansion of the input complex signal: once the sequence PN1and another time sequence PN2. Here the sequence PN1, PN2, PNIand PNQhave the same repetition frequency of their elements.

If the phase Moldovenesc, will change dramatically (for example, from 0 to 180o), it will cause the increase of the ratio of peak power to average power transfer, which will lead to a re-increase and worsen the quality of communication with another user.

However, the configuration generator extender sequences is that, in this embodiment of the present invention when generating complex expanding sequence PNI+jPNQis not passing through zero (no change of phase ).

In Fig.2 presents a block diagram of the generator OFMN with /2 6 proposed as a generator to extend the sequence according to the present invention. The generator features OFMN with /2 6 is that the maximum phase difference between every two successive complex elements of a comprehensive expanding sequence PNI+jPNQis /2.

Generator OFMN with /2 6 comprises a computing unit complex functions 32, a complex multiplier 34 and the delay registers 36 and 38. The multiplier 30 multiplies the PN sequence PNIon /2 or 3/2. It is assumed that the multiplier 30 multiplies each one PSH element of the sequence PNI+jPNQintegrated expanding sequence. Register delay 36 stores the value PNIduring the time of the passing of one element, and the register delay 38 stores the value PNQduring the time of the passing of one element. The initial values of the (complex data) register contents delays 36 and 38 are defined as follows:

(equation 1)

register delay 36 = Re[exp(j)]

register delay 38 = Im[exp(j)],

where can have any value, but preferably /4.

If we assume that successive elements in the sequence PN1and PN2are{1, -1, 1,-1,...} and{-1, 1, -1, 1,...} respectively, and the initial values of the register contents delays 36 and 38 is equal to 1, then the sequential elements of the complex expanding sequence PNI+jPNQgenerated by the generator OFMN with /2 6, are {(-1+j), (1+j), (-l+j), (1+J)...}, a sequential elements of a comprehensive expanding-j), (1+j)...}. Sequence PN1for TL2can be a long code for the identification of a user in the system with 3G mdcr.

In Fig. 3A and 3B shows a set of signals and changes of phases in complex expanding sequence PNI+jPNQcoming from the output of the generator OFMN with /2 6, and complex expanding sequence at the input of filter group spectrum 22-1 and 22-2, respectively. Please refer to Fig. 1 through 3B, where for the first PSH item 1 sequence PN1the output signal of the multiplier 30 in the generator OFMN with /2 6 is shifted by /2, since the other input to the multiplier 30 is shifted by /2, and complex data coming out of the unit for computing complex functions, are expressed in the form of a complex number (Re+jim) in the form (0+1j). Consequently, the complex multiplier 34 creates complex data (-1+j)=(0+j)x(1+j). Here (0+j) - integrated data received from the computing unit complex functions 32, and (1+j) - initial value register contents delays 36 and 38.

In Fig. 3A complex data (-1+j) are in the second quadrant of the diagram in the system of orthogonal coordinates defined valid elements (Re) are imaginary and delay 36 during the time of the passing of one element, and the imaginary part of 1 is stored in the register delay 38 during the time of the passing of one element.

For the second PSH element -1 of the sequence PN1the output signal of the multiplier 30 in the generator OFMN with /2 6 is shifted by a/2, and integrated data received from the computing unit complex functions 32, are expressed in the form of a complex number (Re+jIm) in the form (0-j). Consequently, the complex multiplier 34 creates complex data (1+j)=(0-j)x(-1+j). Here (0-j) - integrated data received from the computing unit complex functions 32, and (-1+j) is the previous value of the delay registers 36 and 38.

In Fig. 3A complex data (1+j) are in the first quadrant of the diagram in the system of orthogonal coordinates. The real part of 1 of the complex data (1+j) is stored in the register delay 36 during the time of the passing of one element and the imaginary part of 1 is stored in the register delay 38 during the time of the passing of one element. Similarly complex data coming from the output of the complex multiplier 34, are (-1+j) for the third PSH item 1 sequence PN1and (1+j) for the fourth PSH element -1 of the sequence PN1.

In Fig.3A grams in the system of orthogonal coordinates, define valid elements (Re) and imaginary components (Im) of the complex signal, and between every two successive complex elements of the phase difference is equal to /2.

The phase difference /2 between every two successive complex elements supported in an integrated expanding sequence, the resulting re-expansion sequence PN2. Please refer to Fig.1, where the complex extends sequence {(1-j), (1+j), (1-j), (1+j). . .} is obtained by multiplying the elements {(-1+j), (1+j), (-1+j), (1+j)...} complex expanding sequence PNI+jPNQitems{ -1, 1, -1, 1,...} sequence PN2. As shown in Fig.3B, in the complex of expanding sequence at the input of filter group spectrum 22-1 and 22-2, the phase difference between every two successive complex elements is /2, as well as in complex expanding sequence PNI+jPNQ.

Since the phase difference between every two successive complex elements of a comprehensive expansion sequences is small, and it is equal to /2, as shown in Fig. 3A and 3B, the ratio of the peak mo is to that reduces the impact of the re-increase. The result is improved efficiency and quality of communication.

If the set value of the phase in radians at the entrance to the multiplier 30 generator OFMN with /2 6 is -3/2, the complex extends the sequence PNI+jPNQlooks like a set of signals shown in Fig. 3A. If the value in radians is -/2 or 3/2, then the elements of a comprehensive expanding sequence PNI+jPNQwill appear sequentially at the same positions in the first and second quadrants in turn, starting with the first quadrant in Fig.3A.

In Fig.4 presents a block diagram of a second variant of the generator OFMN with /2 6 shown in Fig.1. As in the first embodiment, the maximum phase difference between every two successive complex elements of a comprehensive expanding sequence RPI+jNQis /2. Generator OFMN with /2 6 according to the second variant includes the adder 40, the register delays 42 and the computing unit complex functions 44. The adder 40 adds PSH element of the sequence PN1with the previous output signal of the adder 40, which is stored in the register delay 42. Preferably, the initial value of the Regia sequence PNI+jPNQby converting the output signal of the adder 40 in the complex function exp[j(/2())].

Changing the phase of the complex expanding sequence PNI+jPNQis given by equation (2)

(PN(k)I+jPN(k)Q/) (k)

< / BR>
From equation (2) implies that the phase of the current element integrated expanding sequence PNI+jPNQrepresents the sum of the phase of the previous item and the product of the current element of the sequence PNIon /2.

If we assume that successive elements of the sequence PN1and PN2are{1,-1, 1, -1,...} and(-1, 1, -1, 1,.. , } respectively, and the initial value of the contents of the register delay 42 is equal to 1/2, then the sequential elements of the complex expanding sequence PNI+jPNQgenerated by the generator OFMN with /2 6 represent [(-1+j), (1+j), (-1+j), (1+j)...}, and sequential elements of a comprehensive expanding sequence at the input of filter group spectrum 22-1 and 22-2, are {(1-j), (1+j), (1-j), (1+j)...}. Sequence PN1to PN2can be a long code for the identification of the user in the 3G system is egovernance PNI+jPNQcoming from the output of the generator OFMN with /2 6, and complex expanding sequence at the input of filter group spectrum 22-1 and 22-2, respectively.

Please refer to Fig. 1 through 5B, where for the first PSH item 1 sequence PN1the output signal of the adder 40 is equal to 3/2 (=1+1/2) and is stored in the register delay 42 during the time of the passing of one element, and complex data coming from the output of the computing unit complex functions 44, are expressed in the form of a complex number (Re+jlm) in the form (-1+j), and are part of a complex expanding sequence PNI+jPNQ. Here (-1+j) is in the second quadrant of the diagram in the orthogonal coordinate system shown in Fig.5A.

For the second PSH element -1 of the sequence PN1the output signal of the adder 40 is equal to 1/2 (=-1+3/2) and is stored in the register delay 42 during the time of the passing of one element, and complex data coming from the output of the computing unit complex functions 44, are expressed in the form of a complex number (Re+jIm) in the form (1+1j). Here, (1+1j) is in the first quadrant of the diagram in the orthogonal coordinates shown in Fig.represent (-1+j) for the third PSH item 1 sequence PN1and (1+j) for the fourth PSH element -1 of the sequence PN1.

In Fig.5A complex extends the sequence PNI+jPNQexists in the second and first quadrants of the orthogonal system of coordinates defined by the valid elements (Re) and imaginary components (Im) of the complex signal, and the phase difference between every two successive complex elements is /2.

The phase difference /2 between every two successive complex elements supported in an integrated expanding sequence obtained by re-expanding complex of expanding sequence PNI+jPNQthe sequence PN2. (Note that this complex extends the sequence can also be re-expanded initial PN sequence or any other PN sequence). Please refer to Fig.1, where the complex extends sequence {(1-j), (1-j), (1-j), (1+j)...} is obtained by multiplying the elements { (-1+j), (1+j), (-1+j (1+j)...} complex expanding sequence PNI+jPNQitems{-1, 1, -1, 1,...} sequence PN2. As shown in Fig.5B, in Kompleksnye every two successive complex elements is /2, as in the complex expanding sequence PNI+jPNQ.

Since the phase difference between every two successive complex elements of a comprehensive expansion sequences is small, and it is equal to /2, as indicated in Fig. 5A and 5B, the ratio of peak power to average power of a mobile transmission after processing in the filters group spectrum 22-1 and 22-2 is reduced, thereby preventing the re-emergence of increase. The result is improved efficiency and quality of communication.

In Fig.6 presents a block diagram of the MS in the system 3G IS-95, which uses the method of extension and modulation according to a variant of implementation of the present invention. Reverse communication channels include a pilot channel signal, which is always activated, the control channel, main channel, which is derived from work in a specific frame, and an additional channel. Channel pilot signal is not modulated and is used to obtain initial values, time tracking and synchronization rake receiver (collecting receiver). This gives the possibility to regulate the power in the return line in a closed loop. Dedicated control channel transmits nakedyoungnudenudistchild and sent over a single control channel. The main channel is used for sending frames ORS (radio communication Protocol) and packet data.

The channels extend Walsh codes for the formation of orthogonal channels. The signals on the control channel, as well as additional and main channels are multiplied by the corresponding Walsh codes in the multipliers 50, 52 and 54, respectively. The controllers relative gain 56, 58 and 60 regulate the relative gain GWITHthe output signals of the multipliers 50, 52 and 54, respectively. The adder 62 adds the signal of the pilot channel signal with the signal of the control channel received from the controller relative gain 56. Summarized data from the adder 62 is used as a signal of the I-channel. The adder 64 adds the signal of the channel received from the output of the controller relative gain 58 with the signal of the main channel coming from the output of the controller relative gain of 60. Summed in the adder 64 data is used as a signal of the Q-channel.

As shown in Fig.1, the signal sent over the channel, the pilot signal allocated to the control channel, the main channel and the additional channel is a complex signal. Channel pilot signal and the channel is governed by the HP The integrated signal of the I - and Q-channels are subjected to a complex extension of the complex expanding sequence PNI+JPNQin complex extender 2 in Fig.6. Comprehensively enhanced signal is multiplied by the PN sequence2then there is the long code to identify the user. The resulting complex expanding sequence is filtered in the filters group spectrum 22-1 and 22-2 and passed through the controller gain 24-1 and 24-2, mixers 26-1 and 26-2 and the adder 28 with reduced peak-to-average power.

In Fig. 7 presents a block diagram of the MS in the system W-mdcr, which uses the method of extension and modulation according to the present invention. In Fig. 7 dedicated physical channel for data (VCFD) is sent to the traffic signal, and dedicated channel for data management (VCDU) is sent to the control signal. The signal VCFD is multiplied in multiplier 70 to the code channel formation WITHDwith a repetition rate of items, and this channel is the I-channel. The signal WKDU is multiplied in the multiplier 72 to the code channel formation WITHCwith the repetition frequency of the elements, is converted in the form of imaginary numbers using the imaginary operantly I and Q form a complex signal. Complex signal comprehensively expanded complex expanding sequence PNI+jPNQin complex extender 2 in Fig.7 and multiplied by the PN sequence2; that is, the long code to identify the user, which is generated in the PN generator221. The resulting complex expanding sequence is filtered in the filters group spectrum 22-1 and 22-2 and passed through the controller gain 24-1 and 24-2, mixers 26-1 and 26-2 and the adder 28 with reduced peak-to-average power.

According to the above invention, the ratio of the peak power to average power transfer is limited within a certain range by providing the phase difference between every two consecutive elements of a comprehensive expanding sequence 90o. As a result, the power transfer is generated only on the linear plot of characteristics of the power amplifier, allowing the user to adjust the transmission power of a mobile and the cell size of the cell. In addition, can be improved autocorrelation multipath signal and the characteristics of the cross-correlation adopt the e l e C another PN sequence generated by PN generator code.

Although this invention has been presented and described with reference to specific preferred options for its implementation, specialists in the art it is obvious that it is possible to make various changes concerning the form and details of its implementation, within the essence and scope of the invention defined in the claims.

1. A method of reducing peak power to the average transmission power of the mobile station in the mobile communication system, namely, that generate complex extends the sequence in which the phase difference between every two successive complex elements PSH (psevdochumoy) sequence produced by the PN generator 90oand extend the data intended for transmission to the mobile station, the complex extends the sequence.

2. The method according to p. 1, wherein when generating the complex expanding sequence multiply the elements of the PN sequence for the given value of the phase to obtain a shifted phase elements, convert dephased elements in wrought comprehensive data on previously converted complex data to generate many complex elements to extend the sequence.

3. The method according to p. 2, wherein when converting the use of the complex function exp (j[] ) to convert the shifted phase of the elements in complex data.

4. The method according to p. 2, characterized in that the set value of the phase is in the range from F/2 to F3/2.

5. The method according to p. 1, wherein when generating the complex expanding sequence carry out the addition of each element of PN sequence with the corresponding pre-stored element for receiving the summed value of the items and transform the summation of all the elements in the comprehensive data to generate many complex elements to extend the sequence.

6. The method according to p. 2, wherein when converting the use of the complex function exp (j(/2()) to convert the summation of all elements in complex data.

7. The method according to p. 1, characterized in that it further re-expand advanced data intended for transmission to the mobile station, independent PN sequence.

8. Device for reducing the peak power to the average transmission power of the mobile station in the mobile link to the sequence, in which the phase difference between every two successive complex elements PSH (psevdochumoy) sequence produced by the PN generator 90oand an expander for expanding the data intended for transmission to the mobile station, the complex extends the sequence.

9. The device under item 8, characterized in that the generator complex expanding sequence contains a multiplier for multiplying the elements of the PN sequence for the given value of the phase to obtain a shifted phase elements, a complex data generator for converting the shifted phase of the elements in the complex data when using as a phase of each out of phase element and a complex multiplier to generate many elements of a comprehensive expanding sequence multiplying the converted complex data previously converted complex data.

10. The device according to p. 9, wherein when converting the shifted phase of the elements in the complex data we use the complex function exp (j[] ).

11. The device according to p. 9, characterized in that the set value of the phase is in the range of Telenesti contains an adder for adding each element of PN sequence with the corresponding pre-stored element for receiving the summed elements and complex data generator for generating multiple elements of a comprehensive expanding sequence by converting the summation of all elements in complex data.

13. The device according to p. 12, wherein when converting the summed value of the elements in the comprehensive data we use the complex function exp [j(/2())].

14. The device under item 8, characterized in that it further comprises re-extender for re-extended extended data intended for transmission to the mobile station, independent PN sequence.

15. The device according to p. 14, characterized in that the independent PN sequence is identical to the PN sequence.

16. Device for reducing the peak power to the average transmission power of the mobile station in the mobile communication system containing means for generating a complex expanding sequence to generate complex expanding sequence in which the phase difference between every two successive complex elements PSH (psevdochumoy) sequence produced by the PN generator 90oand the extender to extend the data intended for transmission to the mobile station, the complex extends the sequence.

17. The device according to p. 16, wherein the means for generating comeliest on the setting value of the phase to obtain a shifted phase elements, means for generating a comprehensive data shifted in phase elements in complex data when using as a phase of each out of phase element and a means for complex multiplying to generate many complex elements to extend the sequence by multiplying the converted complex data previously converted complex data.

18. The device under item 17, characterized in that the set value of the phase is in the range from F/2 to F3/2.

19. The device according to p. 16, wherein the means for generating a complex expanding sequence contains a means summation for adding each element of PN sequence with the corresponding pre-stored element for receiving the summed elements and means for generating complex data to generate many complex elements to extend the sequence by converting the summation of all elements in complex data.

20. The device according to p. 16, characterized in that it further comprises a means of re-expansion for re-extended extended data intended for transmission in mobile is

 

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2 cl, 2 dwg

FIELD: radio engineering, possible use in communication systems with noise-like signals.

SUBSTANCE: in accordance to method, digital data, received from the source of information on time span [(n-1)T,nT], where T - period of pseudo-random series, n=0,1,2..., during transfer is transformed to shift of pseudo-random series, generated on time span [nT,(n+1)T], and during receipt, value of shift of pseudo-random series of received signal relatively to pseudo-random series of previously received signal is determined, value of shift is transformed to digital data of received information.

EFFECT: increased speed of information transfer along communication channel.

3 cl, 5 dwg

FIELD: radio engineering.

SUBSTANCE: newly introduced in radio line on transmitting end are digital signal source, periodic video pulse sequence generating unit, code combination generating unit, code combination encoding unit, first adder, synchronizing pseudorandom sequence generator, frequency standard, and power amplifier; newly introduced on receiving end are high-frequency unit, frequency standard, clock and sync pulse generator, synchronizing pseudorandom sequence generator, synchronizing pseudorandom sequence search unit, N correlators, decision unit, encoded code combination memory device, code combination decoder, and adder.

EFFECT: enhanced noise immunity in digital signal reception and also enhanced informational and structural security.

1 cl, 4 dwg

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