KR20040078316A - Apparatus and method for dealing of multi path transmitted data in receiver of mobile communication system - Google Patents

Abstract

PURPOSE: An apparatus for processing data transmitted to multiple paths in a receiver of a mobile communication system, and a method therefor are provided to reduce the size and complexity of hardware in realizing a plurality of fingers, and increase the efficiency of a system with a fewer correlation accumulators. CONSTITUTION: A storage controller(300) transmits received data to two register buffers(310,312), wherein the storage controller(300) alternately stores data received by channels to the two register buffer(310,312) at first set time intervals. A finger controller reads data received in multiple paths to one channel at second set time intervals to execute correlation accumulation. The data read from the register buffers are inversely spread by PN(Pseudo Noise) codes, and the inversely spread data are stored in a memory(370).

Description

Apparatus and method for processing data transmitted in multipath from receiver of mobile communication system {APPARATUS AND METHOD FOR DEALING OF MULTI PATH TRANSMITTED DATA IN RECEIVER OF MOBILE COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for implementing multiple fingers in a receiver of a system using a code division multiple access method, and more particularly, to an apparatus for reducing hardware size and complexity generated when implementing multiple channels and fingers in a base station modem. It is about a method.

In general, a mobile communication system collectively refers to a system for providing information such as voice and data through a wireless network, and the mobile communication system may be divided by a multiplexing method. A representative example thereof is a code division multiple access (CDMA) mobile communication system, and the code division multiple access mobile communication system adopts a code division multiple access (CDMA) method to perform a wireless mobile communication service. Refers to a mobile communication system. The CDMA mobile communication system has been developed in the IS-95 standard, which mainly transmits / receives voice signals, and has been discussed as an IMT-2000 standard capable of transmitting high speed data as well as voice. The IMT-2000 standard aims to provide services such as high quality voice, moving picture, and Internet search.

In a mobile communication environment, a multipath phenomenon occurs due to reflected waves caused by buildings or terrain on a path, resulting in a fading state in which the amplitude of a received signal varies. Since the magnitude of the reception power generated by the fading phenomenon is often lowered to the thermal noise level of the receiver, it is difficult to maintain the transmission quality above a satisfactory level.

In addition, when the fading occurs, the phase is also changed irregularly, which is as if the irregular phase modulation is a serious effect on the transmission quality. In particular, the digital modulation method using the phase modulation method has a very serious effect. In order to prevent the degradation of transmission quality due to the fading phenomenon, a diversity scheme is used. The diversity is a method in which two or more antennas are physically installed to enable transmission or reception of two or more radio waves, and spatial diversity is used in mobile communication. Since the diversity is very difficult to implement two or more antennas in the mobile terminal, the base station performs the diversity function using two or more antennas. In addition, IS-95 uses only the receive diversity function, and IMT-2000 uses both receive diversity and transmit diversity to improve call quality. Hereinafter, transmission diversity and reception diversity will be described.

The transmit diversity is a method of receiving and demodulating various signals by one antenna in a mobile station by transmitting two different orthogonal signals by spatially separating two transmit antennas from a base station, and the receiving diversity is transmitted by a mobile terminal. It is a method of demodulating a signal received from a mobile terminal by installing two receiving antennas spatially separated from the base station. In addition, the spatial diversity is received by using two or more antennas at a distance sufficiently separated from each other, and thus the strengths of the signals received by the two antennas may be different from each other. It's a good way.

1 is a diagram illustrating a structure of a finger for receiving data received in a multipath in a general mobile communication system. Hereinafter, a finger structure in a general mobile communication system will be described with reference to FIG. 1. FIG. 1 is composed of eight channels consisting of channels 0 to 7, and each of the eight channels comprises four multipath fingers. That is, since the mobile communication system transmits and receives data through eight channels, all of the 32 communication devices are composed of 32 fingers. Each finger of module 0 receiving channel 0 consists of eight registers, four despreaders, four adders and a multiplexer. Hereinafter, the module 0 which processes data received through the channel 0 will be described.

One symbol of data received by the base station consists of four chips. However, all one chip transmitted to the mobile station is received by the base station through eight multipaths. FIG. 2 is a diagram illustrating one symbol composed of four chips transmitted by the mobile terminal and one symbol composed of 32 chips received by the base station.

Referring to FIG. 2, each symbol of transmission data transmitted by the mobile terminal is composed of four chips having T (0) to T (3). In addition, each symbol for received data received by the base station consists of 32 chips. That is, R (0) to R (7) are chips corresponding to T (0), and R (8) to R (15) are chips corresponding to T (1). In addition, the R (16) to R (23) is a chip corresponding to the T (2), the R (24) to R (31) is a chip corresponding to the T (3). Thus, if the module 0 (100) has one finger, one chip in R (0) to R (7), one chip in the R (8) to R (15), and the R ( 16) to one chip from R (23), and one chip from R (24) to R (31) is selected. However, module 0 of FIG. 1 is composed of four fingers.

Accordingly, the finger 0 represents R (0) at R (0) to R (7), R (8) at R (8) to R (15), and R (16) to R (23). Suppose R (16) and R (24) from R (24) to R (31). Finger 1 is R (2) at R (0) to R (7), R (10) at R (8) to R (15), R at R (16) to R (23) Assume (18) and select R (26) from R (24) to R (31). Finger 2 is R (3) at R (0) to R (7), R (11) at R (8) to R (15) and R at R (16) to R (23). (19) and assume that R (27) is selected from R (24) to R (31). Finger 3 is R (5) at R (0) to R (7), R (13) at R (8) to R (15), R at R (16) to R (23) (21) and assume that R (29) is selected from R (24) to R (31). However, the selection of each chip with respect to the received data may be arbitrarily changed by the selection of the use site. Hereinafter, the operation of the finger 0 will be described.

Register 0 110 selects and stores R (0) from R (0) to R (7) for the chip of T (0) transmitted from the mobile terminal. The stored R (0) is passed to despreader 0 (120). The R (0) delivered to the despreader 0 120 performs despreading by the PN code generated from the PN generator. The PN generator generates S (0) to perform despreading of the R (0). R (0) despread by despreader 0 (120) moves to adder 0 (130). R (0) moved to the adder 0 (130) performs addition with previously stored data. However, since there is no data stored in the adder 0 130, the R (0) moves to the register 10 140 and is temporarily stored.

The register 0 110 selects and stores R (8) from R (8) to R (15) for the chip of T (1) transmitted from the mobile terminal. The stored R (8) is passed to despreader 0 (120). The R (8) delivered to the despreader 0 (120) performs despreading by the PN code generated from the PN generator. The PN generator generates S (1) to perform despreading of the R (8). R (8) despread by despreader 0 (120) moves to adder 0. R (8) moved to the adder 0 (130) performs addition with previously stored data. That is, an addition operation is performed with R (0) stored and transmitted in the register 10 (140). The added R (0) and R (8) move to the register 10 140 and are temporarily stored.

The register 0 110 selects and stores R 16 from R 16 to R 23 for the chip of T 2 transmitted from the mobile terminal. The stored R 16 is passed to despreader 0 120. The R 16 delivered to the despreader 0 120 performs despreading by the PN code generated from the PN generator. The PN generator generates S (2) to perform despreading of the R (16). R 16 despread by despreader 0 120 moves to adder 0 130. The R 16 moved to the adder 0 130 performs addition with previously stored data. That is, an addition operation with R (0) and R (8) stored and transmitted in the register 10 140 is performed. The added R (0), R (8) and R (16) move to the register 10 140 and are temporarily stored.

The register 0 110 selects and stores an R 24 from among the R 24 and the R 31 for the chip of the T 3 transmitted from the mobile terminal. The stored R 24 is passed to despreader 0 120. The R 24 delivered to the despreader 0 120 performs despreading by the PN code generated from the PN generator. The PN generator generates S (3) to perform despreading of the R24. R 24 despread by despreader 0 120 moves to adder 0. The R 24 moved to the adder 0 130 performs addition with previously stored data. That is, an addition operation is performed with R (0), R (8), and R (16) stored and transmitted in the register 10 (140). The added R (0), R (8), R (16) and R (24) are passed to multiplexer 0150.

Hereinafter, the operation of the finger 2 will be described. Register 1 111 selects and stores R (2) from R (0) to R (7) for the chip of T ([1] 0) transmitted from the mobile terminal. The stored R (2) is passed to despreader 1 (121). The R (2) delivered to the despreader 1 121 performs despreading by the PN code generated from the PN generator. The PN generator generates S (0) to perform despreading of the R (2). R (2) despread by the despreader 1 (121) moves to the adder 1 (131). R (2) moved to the adder 1 (131) performs addition with previously stored data. However, since there is no data stored in the adder 1 (131), the R (1) moves to the register 11 (141) and is temporarily stored.

The register 1 111 selects and stores R 10 from R (8) to R (15) for the chip of T (1) transmitted from the mobile terminal. The stored R 10 is passed to despreader 1 121. The R 10 delivered to the despreader 1 121 performs despreading by the PN code generated from the PN generator. The PN generator generates S (1) to perform despreading of the R (10). R (10) despread by the despreader 1 (121) moves to the adder 1 (131). The R 10 moved to the adder 1 131 performs addition with previously stored data. That is, an addition operation is performed with R (2) stored and transmitted in the register 11 (141). The added R (2) and R (10) move to the register 11 (141) and are temporarily stored.

The register 1 111 selects and stores R 18 from R 16 to R 23 for the chip of T 2 transmitted from the mobile terminal. The stored R 18 is passed to despreader 1 121. The R 18 delivered to the despreader 1 121 performs despreading by the PN code generated from the PN generator. The PN generator generates S (2) to perform despreading of the R (18). R 18 despread by despreader 1 121 moves to adder 1 131. The R 18 moved to the adder 1 131 performs addition with previously stored data. That is, an addition operation is performed with R (2) and R (10) stored and transferred in the register 11 (141). The added R (2), R (10), and R (18) move to the register 11 (141) and are temporarily stored.

The register 1 111 selects and stores an R 26 from an R 24 to an R 31 for a chip of the T 3 transmitted from the mobile terminal. The stored R 26 is passed to despreader 1 121. The R 26 transmitted to the despreader 1 121 performs despreading by the PN code generated from the PN generator. The PN generator generates S (3) to perform despreading of the R 26. R 26 despread by despreader 1 121 moves to adder 1 131. The R 26 moved to the adder 1 131 performs addition with previously stored data. That is, an addition operation is performed with R (2), R (10), and R (18) stored and transferred in the register 11 (141). The added R (2), R (10), R (18) and R (26) are passed to multiplexer 0150.

The process performed by the fingers 2 to 3 is the same as the process performed by the finger 0 or the finger 1. Of course, the number of chips selected from the fingers 2 to 3 is different from the chip numbers selected from the finger 0 or the finger 1. The multiplexer 0 150 transfers the chip accumulation values transferred from the adders 0 130 to the adder 3 133 to the multiplexer 2 154. The operation performed by the module 1 to the module 7 (170) receiving the channels 1 to 7 is the same as the operation performed by the module 0 (100). The multiplexer 2 154 transfers the chip accumulation values transferred from the module 0 (100) to the modulus 7 (170) to the memory 160.

As described above, the base station receiver must have a receiver for a plurality of channels and a finger for each of the multiple paths for each channel. Therefore, accommodating a large number of channels increases the hardware size and complexity of the receiver. In other words, implementing a plurality of fingers requires a large number of despreaders, adders, and registers. Therefore, a method of not increasing hardware size and complexity in implementing a plurality of fingers is discussed.

Accordingly, an object of the present invention to solve the above-mentioned problems of the prior art is to provide a device for maintaining a constant hardware size regardless of an increase in the number of channels to receive and an increase in the number of fingers for each channel in a receiver of a mobile communication; In suggesting a method.

Another object of the present invention is to propose an apparatus and method for reducing the complexity of the system and increasing the efficiency of the receiver by not increasing the hardware of the receiver.

In order to achieve the above object of the present invention, a storage controller is received in multiple paths in one channel, and in a mobile communication system having multiple channels, the storage controller transfers the received data to two register buffers. When the storage controller transfers the data received for each channel to the two register buffers at the first set time interval in the transfer of the received data, the finger controller multiplexes one channel at the second set time interval. Correlation accumulation is performed by reading data received through the path. That is, the data read out from the register buffers are despread by the PN code, and the despread data is stored in the memory.

1 is a diagram illustrating a process of processing data transmitted in a multipath in a general mobile communication system.

2 is a diagram illustrating a process in which data transmitted from a mobile station by a base station is received by multipath;

3 is a diagram illustrating a process of processing data transmitted in a multipath in a mobile communication system according to the present invention.

4 is a detailed view of the structure of the register buffer of FIG.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a diagram illustrating a structure of a finger for receiving data received in multiple paths in a mobile communication system according to the present invention. Hereinafter, a finger structure in a general mobile communication system will be described with reference to FIG. 3. FIG. 3 is composed of eight channels consisting of channels 0 through 7, and each of the eight channels comprises four multipath fingers. In addition, the data received by the base station of FIG. 3 is the same as the data shown in FIG.

Referring to FIG. 2, each symbol of transmission data transmitted by the mobile terminal is composed of four chips having T (0) to T (3). In addition, each symbol for received data received by the base station consists of 32 chips. That is, R (0) to R (7) are chips that are equivalent to T (0), and R (8) to R (15) are chips that are equivalent to T (1). In addition, the R (16) to R (23) is a chip equivalent to the T (2), the R (24) to R (31) is a chip equivalent to the T (3). Therefore, if the module 0 has one finger, one chip in the R (0) to R (7), one chip in the R (8) to R (15), and the R (16) to One chip is selected at R 23, and one chip is selected at R 24 to R 31. However, the register buffer 0 of FIG. 3 is composed of four fingers.

Accordingly, the finger 0 is R (0) at R (0) to R (7), R (8) at R (8) to R (15), and R (16) to R (23). Suppose R (16) and R (24) from R (24) to R (31). Finger 1 is R (2) at R (0) to R (7), R (10) at R (8) to R (15), R at R (16) to R (23) Assume (18) and select R (26) from R (24) to R (31). Finger 2 is R (3) at R (0) to R (7), R (11) at R (8) to R (15) and R at R (16) to R (23). (19) and assumes that R (27) is selected from R (24) to R (31). Finger 3 is R (5) at R (0) to R (7), R (13) at R (8) to R (15), R at R (16) to R (23) (21) and assume that R (29) is selected from R (24) to R (31). However, the selection of each chip with respect to the received data may be arbitrarily changed by the selection of the use site. Hereinafter, the present invention will be described in detail with reference to FIG. 3. In addition, although the finger controller is not illustrated in FIG. 3, the finger controller includes the register buffer 0 310 to the register buffer 1 312, the multiplexer 8 340 to the multiplexer 11 343, and the inverse. The PN codes input to the diffusers 350 to 353 are controlled.

The storage controller 300 receives the data transmitted through the channel 0 through the channel 7 and sequentially transfers the data transmitted to the register buffer 0 310 to the register buffer 1 312. That is, the register buffer 0 310 transfers data transferred from channel 0, channel 2, channel 4, and channel 6, and the register buffer 1 312 transfers from channel 1, channel 3, channel 5, and channel 7. Data is delivered. The storage controller 300 transfers the data transferred from the channel 0 to the register buffer 0 310 at times T0 to T3, and transfers the data transferred from the channel 1 to the register buffer 1 312 at times T4 to T7. To pass. In addition, the storage controller 300 transfers the data transferred from the channel 2 to the register buffer 0 310 at times T8 to T11, and transfers the data transferred from the channel 3 at times T12 to T15 to the register buffer 1 312. To pass. The storage controller 300 transfers the data transferred from the channel 4 to the register buffer 0 310 at times T16 to T19, and transfers the data transferred from the channel 5 to the register buffer 1 312 at times T20 to T23. To pass. The storage controller 300 also transfers the data transferred from the channel 6 to register buffer 0 310 at times T24 to T27 and the data transferred from the channel 7 at times T28 to T31 at register buffer 1 312. To pass. Hereinafter, the process performed at times T0 to T3 will be described.

The storage controller 300 transfers data transferred from the channel 0 to the register buffer 0 310. 4 is a diagram illustrating the structure of a register buffer according to the present invention. The register buffer is composed of all four registers. That is, the data composed of registers 0 320 to 3 323, and the data stored in the registers 0 320 to 3 323 are the same as shown in FIG. 3. Referring to FIG. 4, the register 0 320 stores R (0) to R (7) in T0, and the register 1 321 stores R (8) to R (15) in T1. . In addition, in T2, register 2 (322) stores R (16) to R (23), and in T3, register 3 (323) stores R (24) to R (31). However, since FIG. 3 has four fingers in each channel, only four data required by the four fingers can be stored in each of the register buffers. Hereinafter, the process performed in the register buffer 1 312 at times T4 to T7 will be described first, and then the process performed in the register buffer 0 310 will be described.

In the T4 to T7, the storage controller 300 transfers the data transferred from the channel 1 to the register buffer 1 312. The process performed in the register buffer 1 312 is the same as the process performed in the register buffer 0 310 in FIGS. 4 and T0 through T3. Hereinafter, the process performed in the register buffer 0 310 at times T4 to T7 will be described.

In T4, the multiplexer 0 330 reads R (0) stored in the register 0 320 and delivers the result to the multiplexer 8 340, and the multiplexer 1 331 is stored in the register 1 321. R (8) is read and forwarded to multiplexer 9 (341). In addition, the multiplexer 2 332 reads the R 16 stored in the register 2 322 and delivers it to the multiplexer 10 342, and the multiplexer 3 333 is stored in the register 3 323. R 24 is read and passed to multiplexer 11 (343). Despreader 0 350 despreads R (0) delivered from multiplexer 8 340 by the PN code delivered from PN code generator. Among the PN codes generated from the PN generator, S0 (0) is selected for despreading of R (0) and transferred to the despreader 0350. The despreader 0 350 transfers R (0) despread by the S0 (0) to the adder 360. Despreader 1 351 despreads R (8) delivered from multiplexer 9 341 by the PN code delivered from the PN code generator. From the PN codes generated from the PN generator, S0 (1) is selected for despreading of the R (8) and transferred to the despreader 1 351. The despreader 1 351 delivers the R (8) despread by the SO (1) to the adder 360.

Despreader 2 352 despreads the R 16 delivered from multiplexer 10 342 by the PN code delivered from the PN generator. From the PN codes generated from the PN generator, S0 (2) is selected for despreading of the R 16 and transferred to the despreader 2 (352). The despreader 2 352 delivers the R 16 despread by the SO 2 to the adder 360. Despreader 3 353 despreads R 24 delivered from multiplexer 11 343 by the PN code delivered from the PN code generator. From the PN codes generated from the PN generator, S0 (3) is selected for despreading of the R 24 and transferred to the despreader 3 (353). The despreader 3 353 forwards the R 24 despread by the SO 3 to the adder 360. The despread R (0), R (8), R (16), and R (24) delivered to the adder 360 are moved to the memory 370 and stored.

In T5, the multiplexer 0 330 reads R (2) stored in the register 0 320 and delivers the result to the multiplexer 8 340, and the multiplexer 1 331 is stored in the register 1 321. The R 10 is read and forwarded to the multiplexer 9 341. In addition, the multiplexer 2 332 reads the R 18 stored in the register 2 322 and delivers it to the multiplexer 10 342, and the multiplexer 3 333 is stored in the register 3 323. R 26 is read and forwarded to multiplexer 11 (343). Despreader 0 350 despreads R (2) delivered from multiplexer 8 340 by the PN code delivered from the PN generator. From the PN codes generated from the PN generator, S0 (0) is selected for despreading of the R (2) and transferred to the despreader 0350. The despreader 0 350 transfers the R (2) despread by the S0 (0) to the adder 360. The despreader 1 351 performs despreading of the R 10 delivered from the multiplexer 9 341 by the PN code delivered from the PN generator. From the PN codes generated from the PN generator, S0 (1) is selected for despreading of the R (10) and transferred to the despreader 1 (351). The despreader 1 351 transfers the R 10 despread by the SO 1 to the adder 360.

Despreader 2 352 despreads R 18 delivered from multiplexer 10 342 by the PN code delivered from the PN code generator. From the PN codes generated from the PN generator, S0 (2) is selected for despreading of the R (18) and transferred to the despreader 2 (352). The despreader 2 352 delivers the R 18 despread by the SO 2 to the adder 360. Despreader 3 353 despreads R 26 delivered from multiplexer 11 343 by the PN code delivered from the PN code generator. From the PN codes generated from the PN generator, S0 (3) is selected for despreading of the R 26 and transferred to the despreader 3 (353). The despreader 3 353 forwards the R 26 despread by the SO 3 to the adder 360. The despread R (2), R (10), R (18), and R (26) delivered to the adder 360 are moved to the memory 370 and stored. In addition, the register buffer 0 310, the multiplexer 8 340 to the multiplexer 11 (343), the despreader 0 350 to the despreader 3 (353), and the adder 360 and the memory at T6 to T7. The process performed at 370 is the same as the process performed at T4 or T5.

When the execution of the processes T4 to T7 ends, the storage controller 300 stores the data received from channel 2 in 0 310 in the register buffer. That is, in T8, register 0 320 stores R (0) to R (7), and in T9, register 1 321 stores R (8) to R (15). In addition, in T10, registers 2 322 are stored in R (16) to R (23), and in T11, registers 3 323 are stored in R (24) to R (31). In addition, the register buffer 1 312 performs processing on data received and stored from the channel 1. Processes performed in the register buffer 1 312 in T8 through T11 are the same as processes performed in the register buffer 0 310 in the T4 through T7. Of course, only the process of despreading by selecting one of the PN codes generated from the PN generator is different. That is, the PN code is composed of S0 to S7, and the Arabic numeral means a channel number. In addition, PN codes for the respective channels are divided into (0) to (3). (0) means that the transmission symbols are used to despread the 0th chip. That is, S3 (2) means that the code used for despreading the second chip in each symbol among the data received through the channel 3.

In the same manner as described above, the same process for channels 3 to 7 is performed by despreading and storing the received data in a memory. That is, the register buffer 0 310 to the register buffer 1 312 alternately store and process the stored data, thereby processing data transmitted in the multipath from the mobile terminal.

As described above, in the related art, a correlation accumulator is provided for each received channel and each finger received in each channel. However, the present invention does not include a correlation accumulator for each received channel. It is also possible to perform a conventional finger operation. Thus, in implementing a plurality of fingers, it is possible to reduce hardware size and complexity, and increase the efficiency of the system.

Claims (8)

A receiver of a mobile communication system for receiving a plurality of channels and data transmitted through one of the plurality of channels in a multipath, the method of accumulating and storing data received in the multipath in a memory, A first process of alternately storing data received through the plurality of channels in two register buffers for each received channel at a first set time interval; And a second process of reading data transmitted in multiple paths through a single channel stored in the register buffers at a second set time interval, accumulating the read data and storing the read data in a memory. The method of claim 1, wherein the two register buffers alternately perform the first process and the second process. 3. The register of claim 2, wherein the register buffers have registers of the same number as the number of chips constituting a symbol of the received data, the registers having the same number of regions as the number of the multipaths for one channel. The method characterized in that it comprises a. 4. The method as claimed in claim 3, wherein the read data is despread using a pseudo random number (PN) code, and the despread data is stored in a memory. A receiver of a mobile communication system for receiving a plurality of channels and data transmitted through one of the plurality of channels in a multipath, and accumulating and storing the data received in the multipath in a memory. A storage controller configured to alternately transfer and store data received through the plurality of channels to first register time intervals as two register buffers for each received channel; And a finger controller configured to read data transmitted in multiple paths through a single channel stored in the register buffers at a second set time interval, and accumulate the read data and store the read data in a memory. The method of claim 5, wherein the two register buffers, And storing the data transmitted from the storage controller and reading the data for accumulating the stored data in a memory. The method of claim 6, wherein the register buffers, The apparatus having the same number of registers as the number of chips constituting a symbol of the received data, the registers having the same number of regions as the number of the multipaths for one channel. . 8. The apparatus as claimed in claim 7, further comprising a despreader for despreading the read data using a pseudo random number (PN) code and transferring the despreaded data to a memory.