KR20000074587A - Apparatus and method for pilot/traffic channel signal transmission and for base station specific code acquision using cyclic code - Google Patents

Abstract

PURPOSE: A method for obtaining codes of base stations is provided to insert a cyclic code into a transmission frame to transmit pilot/traffic channel signals, so as to reduce a time spent on a frame synchronization and a group code obtained in an asynchronous transfer mode(ATM) code division multi access(CDMA) system. CONSTITUTION: A terminal detects a symbol timing of cyclic codes through an interfacing filter for channel identifying codes. The terminal tests a max outputting point of the interfacing filter to detect a long-cycle code timing. The terminal loads a group code into a group identifying code circuit, to upgrade the group code. The terminal firstly correlates a received I pilot code with a generated group code. The terminal compares a threshold with the firstly correlated outputs, to decide whether cell codes are synchronized. The terminal respectively loads cell codes included in the group code into a cell identifying code circuit, to generate the cell codes. The terminal secondly correlates self-generated group/cell codes with received I/Q pilot codes. The terminal compares the threshold with the secondly correlated outputs and decides whether the cell codes are synchronized. If the cell codes are not synchronized, the terminal repeats the processes from the beginning.

Description

Apparatus and method for acquiring pilot / traffic channel signal using cyclic code and base station code acquiring device and method thereof

The present invention relates to an apparatus for transmitting a pilot / traffic channel signal at a base station and a method thereof, and to an apparatus for acquiring a base station code at a terminal, and a method and a computer-readable recording medium having recorded thereon a program for implementing the methods. will be.

In particular, the present invention relates to a pilot / traffic channel signal transmission apparatus and method for transmitting a pilot / traffic channel signal by inserting a cyclic code in a base station of a code division multiple access (CDMA) system operating in an asynchronous mode; The present invention relates to a base station code obtaining apparatus for acquiring a base station code in a terminal, and a method and a computer readable recording medium storing a program for implementing the methods.

In a mobile communication system using a code division multiple access (CDMA) method, a personal mobile communication system (PCS), and a next-generation mobile communication system (IMT-2000), each base station constituting a cell may determine base station information and timing criteria of a communication channel. The pilot code provided is continuously generated and sent to the terminal. At this time, in order to clarify the distinction of the base station to which the terminal wants to communicate, each cell (base station) uses a code for identifying the base station, which is a pilot code. The mobile terminal obtains a pilot code of a base station that can serve for communication and is provided with information necessary for link establishment.

Synchronous code division multiple access (CDMA) systems, in which all base stations are operated synchronously by absolute time provided by systems such as Global Position System (GPS), have a fixed interval (for example, 64 chips in "IS-95", wideband code division). In the asynchronous code division multiple access (CDMA) system, since the base stations are not synchronized with each other, unlike in the multiple access (W-CDMA) method, the same code shifted by 256 chips is used. Use a different pilot code.

In-phase / Quadrature (I / Q) multiplexed codes are representative pilot codes used in asynchronous code division multiple access (CDMA) systems. An example thereof will be described with reference to FIG. 1.

1 is an exemplary configuration diagram of a conventional base station pilot / traffic channel signal transmission apparatus.

As shown in the figure, the channel structure of the base station includes a pilot signal processor 101 for processing a pilot signal, a control / traffic signal processor 110 for processing a control signal and a traffic signal, and code units 102 to 105. A multiplier (106 to 109, 111 to 114) for multiplying and multiplying the signals from the signal processing units (101, 110) and the codes (102 to 115), and a linear combiner for combining the signals of the I channel and the signals of the Q channel, respectively. And a radio frequency unit 117 and an antenna 118 for transmitting the combined signal (115, 116). In addition, one pilot channel, several control channels, traffic channels, etc. may be configured through these. Code units 102 to 105 have a Pseudo Noise (PN) code for modulating and identifying each channel, which includes a group identification code unit 103, a cell identification code unit 104, and a channel. An identification code section 102, a long period code section 105, and the like. The group identification code section 103 generates a short period group code, and the cell identification code section 104 generates a short period cell code. The channel identification code section 102 generates a code used to identify all channels in the base station. Typically, different Walsh codes are used for each channel. The long period code unit 105 is a part for generating a long period code for the purpose of scrambling the control and traffic channels.

In the I / Q multiplexed code used as one pilot code, the I pilot code and the Q pilot code are used as the group code for identifying the base station group and the cell code for identifying the base station itself, respectively. Therefore, only the Q pilot code is different from the pilot codes of base stations belonging to the same group, and the I pilot code is composed of the same code. On the other hand, in asynchronous code division multiple access (CDMA) systems, short period codes of the same length are used as group codes and cell codes.

2 is a structural diagram of an embodiment of a transmission frame using an identification code in a conventional base station channel structure.

As shown in the figure, the timings of the I pilot code and the Q pilot code coincide, and the base station repeatedly transmits the pilot code. In addition, the length of the long period code coincides with an integer multiple of the pilot code. In an asynchronous CDMA system, information on a common control channel and a traffic channel are transmitted by a long period code, and the long period code is repeatedly transmitted with a length equal to a frame length as one period.

Meanwhile, referring to FIG. 3, a conventional method of acquiring a pilot code having the largest reception strength in order to obtain a traffic channel for communication by a terminal in an arbitrary cell in an asynchronous code division multiple access (CDMA) system will be described. Same as

3 is a flowchart illustrating a method for obtaining a base station code in a conventional terminal.

First, a group code of the cell is searched and found through a pilot channel having the largest reception strength (301). Looking at the process in detail, first, the terminal generates an arbitrary group code in the group code set to determine whether to synchronize with the received I pilot code. In this process, the terminal uses a threshold of a predetermined value as a criterion for the determination. As a result of the determination, if not synchronized, the terminal moves the generated group code by one chip. Then, it is again determined whether or not synchronization with the received I pilot code is made. This process is repeated for all other group codes in sequence. If the synchronization is not determined through all group codes, the above process is repeated from the first group code.

On the other hand, once the synchronization of the group code is obtained in step 301, the terminal searches for and finds the unique cell code of the cell to which it belongs (302). In this case, the terminal may use the already obtained group code. That is, only cell codes belonging to the obtained group code are sequentially searched. At this time, since the group code and the cell code have the same timing, the cell code is generated in accordance with the start timing of the group code and the synchronization is determined. Through this process, the pilot code can be obtained, so that the terminal can obtain synchronization for the pilot channel.

Finally, the terminal performs a process of matching the start timing of the long period code for the common control channel and the traffic channel, that is, frame synchronization, from the obtained group code and cell code (303). In this case, the long period code may be implemented to be found in a code table owned by the terminal, or may be implemented to be provided from a base station through a message transmitted through a sync channel by the same code as the pilot code. Since the pilot code and the long period code have the same timing, the terminal generates the obtained long period code at the start timing of the currently synchronized pilot code and confirms synchronization with the received long period code. At this time, synchronization is determined based on a predetermined threshold. If the synchronization does not match, after moving the long period code by the period of the pilot code, it is determined whether the long period code received and the long period code generated by the terminal are synchronized in the same manner as described above. If determined to be synchronized, the communication link may be established.

However, in the conventional method as described above, the base station code is acquired in the process of acquiring the group code, because the movement generation and the synchronization determination must be repeated sequentially over the entire group code for synchronization with the group code generated at the receiver. There was a problem that takes a lot of time.

In addition, in the conventional method as described above, in the frame synchronization process, the base station code needs to repeat the movement generation and the synchronization determination sequentially over the long period code for the synchronization between the long period code generated in the receiver and the long period code received. There was a problem that takes a lot of time to obtain.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. In the asynchronous code division multiple access (CDMA) system using I / Q multiplexed code, the present invention relates to a transmission frame to significantly reduce the time required for group code acquisition and frame synchronization. An object of the present invention is to provide a pilot / traffic channel signal transmission apparatus for transmitting a pilot / traffic channel signal by inserting a cyclic code, and a method and a computer-readable recording medium having recorded thereon a program for realizing the method.

In addition, the present invention provides a base station code obtaining apparatus and a method and a computer for recording the program for realizing the method, which greatly reduce the time required for group code acquisition and frame synchronization, and at the same time, the terminal acquires the base station code. Another purpose is to provide a record carrier that can be read by a computer.

1 is an exemplary configuration diagram of a conventional base station pilot / traffic channel signal transmission apparatus.

2 is a structural diagram of an embodiment of a transmission frame using an identification code in a conventional base station channel structure.

3 is a flowchart illustrating a method for obtaining a base station code in a conventional terminal.

Figure 4 is a block diagram of an embodiment of a base station pilot / traffic channel signal transmission apparatus according to the present invention.

5 is a structure diagram of an embodiment of a transmission frame according to an identification code in a base station channel structure according to the present invention;

6 is a block diagram of an embodiment of an apparatus for acquiring a base station code of a terminal according to the present invention;

7 is a flowchart illustrating an embodiment of a method for acquiring a base station code according to the present invention;

* Explanation of symbols for the main parts of the drawings

401: pilot signal processing unit 402: group identification code unit

403: cell identification code part 404: channel identification code part

405: cyclic code portion 406: long cycle code portion

407,408,416 to 419,421,422 Multiplier 410 Switch

415: switch control unit 420: control / traffic signal processing unit

423,424: linear combiner 425: radio frequency section

426: antenna

An apparatus of the present invention for achieving the above object is a pilot / traffic channel signal transmission apparatus using a cyclic code, comprising: group identification code generating means for generating a short period group code; Cell identification code generating means for generating a short period cell code; Channel identification code generating means for generating a channel identification code used for identifying each channel in the base station; Cyclic code generating means for generating a cyclic code having the same period as the pilot transmission frame; Long period code generating means for generating a long period code having the same period as the pilot transmission frame; Seventh spreading modulation means for spreading modulation by multiplying the generated cyclic code by the channel identification code; An eighth spreading modulation means for spreading modulation by multiplying the generated long period code by a channel identification code; Switch control means for generating a control signal in accordance with control from the outside; Switching means for switching signals and logic zero values (0) output from said group identification code generating means, cell identification code generating means, channel identification code generating means, seventh and eighth spreading modulation means in accordance with said control signal; Pilot signal processing means for processing a pilot signal; Control / traffic signal processing means for processing the control signal and the traffic signal; A first code for spreading modulation by multiplying the group code from the pilot signal processing means by the switched group identification code or logical zero value (0) and by multiplying by the switched channel identification code or the output signal of the seventh spreading modulation means; Third diffusion modulation means; A second for multiplying and modulating a cell code from the pilot signal processing means by the switched cell identification code or a logical zero value (0) and by multiplying by the switched channel identification code or an output signal of the seventh spreading modulation means; Fourth diffusion modulation means; Fifth and sixth spreading modulation means for spreading modulation by multiplying a signal from the control / traffic signal processing means with an output signal of the switched channel identification code or the eighth spreading modulation means; Linear combining means for combining signals of each of the spread modulated channels; And radio frequency transmitting means for transmitting the combined signal.

Further, another apparatus of the present invention is a pilot / traffic channel signal transmission apparatus using a cyclic code, comprising: pilot signal processing means for processing a pilot signal; Control / traffic signal processing means for processing the control signal and the traffic signal; Means for dividing a pilot frame consisting of a pilot code into a predetermined number of slots, and inserting a cyclic code for frame synchronization in each of the divided slots to form a pilot transmission frame in which a pilot code and a cyclic code appear alternately; Linear combining means for respectively combining signals of each channel; And radio frequency transmitting means for transmitting the combined signal.

On the other hand, the method of the present invention, the pilot / traffic channel signal transmission method applied to the pilot / traffic channel signal transmission apparatus using a cyclic code, comprising: a first step of dividing a pilot frame consisting of a pilot code into a predetermined number of slots; A second step of forming a pilot transmission frame in such a manner that a pilot code and a cyclic code appear alternately by inserting a cyclic code for frame synchronization in each of the divided slots; And a third step of combining and transmitting signals of each channel.

According to another aspect of the present invention, there is provided an apparatus for acquiring a base station code of a terminal using a cyclic code, the apparatus comprising: radio frequency receiving means for processing a radio frequency received through an antenna and outputting a digital signal; Group code generating means for generating a group code; First correlation means for correlating and outputting a group code from said group code generating means and a group code signal from said radio frequency receiving means by a first predetermined time; Cell code generating means for generating a cell code; Second correlation means for correlating and outputting a cell code from said cell code generating means and a cell code signal from said radio frequency receiving means for a second predetermined time; Whether the group code and the cell code are synchronized by comparing the output of the first correlation means with a first predetermined threshold and comparing the sum of the output of the first correlation means and the output of the second correlation means with a second predetermined threshold; First detecting means for determining; Correlation detecting means for receiving the output of the first detecting means and detecting a cyclic code symbol using a channel identification code; Matched filtering means for outputting a correlation result between the cyclic code sequence and the output of the correlation detecting means; Second detecting means for finding a maximum point among a predetermined number of input signals; Long period code generating means for generating a long period code; And control means for controlling each of the components.

On the other hand, the method of the present invention, in the base station code acquisition method applied to the base station code acquisition apparatus using a cyclic code, the first step of acquiring frame synchronization (starting period of one period of the long period code) using the cyclic code ; A second step of acquiring synchronization of a group code using the frame synchronized time point; And a third step of acquiring a cell code using the group code synchronization time point and the group code.

On the other hand, the present invention, a pilot / traffic channel signal transmission apparatus having a microprocessor, the first function for dividing a pilot frame consisting of a pilot code into a predetermined number of slots; A second function of inserting a cyclic code for frame synchronization in each of the divided slots to form a pilot transmission frame such that a pilot code and a cyclic code appear alternately; And a computer readable recording medium having recorded thereon a program for realizing a third function of combining and transmitting signals of each channel.

The present invention also provides a base station code acquisition apparatus including a microprocessor, comprising: a first function of acquiring frame synchronization (time at which one cycle of a long period code starts) using a cyclic code; A second function of acquiring synchronization of a group code by using the frame synchronized time point; And a computer-readable recording medium having recorded thereon a program for realizing a third function of acquiring a cell code using the group code synchronization time point and the group code.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a configuration diagram of an embodiment of a base station pilot / traffic channel signal transmission apparatus according to the present invention, and FIG. 5 is a structure diagram of a transmission frame according to an identification code in a base station channel structure according to the present invention.

The base station pilot / traffic channel signal transmission apparatus according to the present invention includes a cyclic code section 405 and code sections 402 to 406 for generating a cyclic code in the conventional base station pilot / traffic channel signal transmission apparatus shown in FIG. Is a channel structure diagram configured by further adding a switch 410 for switching a code generated by the switch and a switch controller 415 for controlling the switch 410.

A detailed configuration of such a pilot / traffic channel signal generator will be described below with reference to FIG. 4.

An apparatus for transmitting a base station pilot / traffic channel signal according to the present invention includes a group identification code unit 402 for generating a short period pseudo noise (PN) group code and a short period pseudo noise (PN) cell code. Cell identification code section 403, channel identification code section 404 for generating a channel identification code used to identify each channel in the base station, cyclic code for generating a cyclic code having the same period as the pilot transmission frame A long period code part 406 for generating a long period code having the same period as the pilot transmission frame, the cyclic code generated by the cyclic code part 405 and the channel identification code part 404 A multiplier for multiplying a channel identification code by a seventh multiplier 407 and a long period code generated by the long period code unit 406 and a channel identification code generated by the channel identification code unit 404 An eighth multiplier 408 for acid modulation, a switch controller 415 for generating a control signal for controlling the switch according to control from an external microprocessor, and the control signal from the switch controller 415 A switch for switching signals and logic zero values (0) output from the group identification code part 402, the cell identification code part 403, the channel identification code part 404, and the seventh and eighth multipliers 407 and 408. 410, a pilot signal processor 401 for processing a pilot signal, a control / traffic signal processor 420 for processing a control signal and a traffic signal, and a group code from the pilot signal processor 401 for the switch 410. The first multiplier 416 for spreading modulation by multiplying the group identification code or the logical zero value (0), and the channel identification code switched at the switch 410 or the output signal of the first multiplier 416 The seventh product A third multiplier 418 for multiplying and multiplying the output signal of the multiplier 407 and a cell identification code or a logical zero value (0) switched from the pilot signal processing unit 401 by the switch 410 Multiply the output signal of the second multiplier 417 and the second multiplier 417 by the channel identification code switched by the switch 410 or the output signal of the seventh multiplier 407 To multiply the signal from the fourth multiplier 419 and the control / traffic signal processor 420 with the channel identification code switched by the switch 410 or the output signal of the eighth multiplier 408. And fifth and sixth multipliers 421 and 422, linear combiners 423 and 424 for combining the signals of each of the spread modulated channels, and radio frequency transmitters 425 and 426 for transmitting the combined signals.

Next, the operation of the base station pilot / traffic channel signal transmission apparatus according to the present invention in detail as follows.

The cyclic code unit 405 sequentially generates a cyclic code of N _c bits (for example, 16 bits) by one bit. When all bits are generated, the cyclic code unit 405 generates the cyclic code again from the first bit of the cyclic code after the last bit. Thus, N _c bits are repeated indefinitely. The time when all the cyclic code N _c bits are generated once, that is, one period is equal to the frame length. The interval between the occurrences of each bit of the cyclic code is N _B times the base station identification code period. Therefore, in the cyclic code, the first bit is generated after N _B times the base station identification code period elapses from the beginning of the frame, and then the second bit of the cyclic code after N _B times the base station identification code period elapses. A bit is generated. The last bit of the cyclic code starts before the end of the frame length and ends its duration at the end of the frame period. Various codes are known as cyclic codes. However, in order to be effective for frame synchronization, it is preferable to select and use cyclic codes having excellent correlation characteristics.

The output of the cyclic code unit 405 is input to the seventh multiplier 407, multiplied by the channel identification code input from the channel identification code unit 404 by the seventh multiplier 407 is spread-modulated third It is output to the switch 413.

Each of the four switches 411 to 414 has two contacts and connects each of the code parts 402 to 406 and the first to sixth multipliers 416 to 419, 421 and 422, that is, the diffusion modulator. The contact point 1 of the first switch 411 is connected to the group identification code part 402, and the contact point 2 is connected to an output signal which does not affect the logic value 0 state, that is, the phase change of the code. The contact 1 of the second switch 412 is connected to the cell identification code part 403 and the contact 2 is connected to the logic value 0 status signal. The seventh multiplier 407 which is connected to the channel identification code part 404 of the third switch 413 and gradually spreads modulates the output of the cyclic code part 405 to the output of the channel identification code part 404. Is connected to the output of. And, the contact point 1 of the fourth switch 414 is connected to the eighth multiplier 408 which spread-modulates the output of the long period code part 406 as the output of the channel identification code part 404, and the contact point 2 is the channel identification code part. 404 is connected. These four switches 411 to 414 are simultaneously switched from contact 1 to contact 2 or vice versa according to the control signal of the switch controller 415.

The switch controller 415 outputs a control signal (control signal of FIG. 5) for switching the contact point of the switch under the control of the microprocessor. The first to fourth switches 411 to 414 are simultaneously switched from contact point 1 to the contact point 2 at the rising point of the rectangular pulse, and the first to fourth switches 411 to 414 are contacting at the contact point 2 at the falling point of the rectangular pulse. Switch to 1 simultaneously. The interval from the falling point of the rectangular pulse to the next falling point is the slot section.

In this way, when the spherical pulse is output as the control signal from the switch controller 415, all the switches 411 to 414 are switched from the contact point 1 to the contact point 2. Then, the first multiplier 416 and the second multiplier 417 outputs the I signal and the Q signal of the pilot signal processing unit 401 as it is, and the third multiplier 418 uses the channel identification code in the seventh multiplier 407. A spread modulated cyclic code is received, and the output of the first multiplier 416 is received, and the resultant signal is multiplied and spread modulated. In addition, the fourth multiplier 419 receives the spread modulated cyclic code as the channel identification code from the seventh multiplier 407, receives the output of the second multiplier 417, and multiplies these to output the resultant signal. . The fifth multiplier 421 receives the output I signal of the control / traffic signal processing unit 420 and the output of the channel identification code unit 404 as an input, multiplies them, and modulates the output. The sixth multiplier 422 receives the output Q signal of the control / traffic signal processing unit 420 and the output of the channel identification code unit 404 as inputs, multiplies them, and modulates and outputs the result.

Therefore, in the pilot channel, a spread modulated cyclic code is transmitted instead of a pilot code. In general, since the channel identification code used to identify the pilot channel consists of a logical value of 0, in this case, the cyclic code itself is transmitted. In the control channel and the traffic channel, the transmission of the long period code is stopped and instead only the channel identification code is transmitted. In this case, the power control bit may be used as a modulation signal in the traffic channel.

6 is a diagram illustrating an embodiment of an apparatus for acquiring a base station code of a terminal according to the present invention.

The apparatus for acquiring a base station code of a terminal according to the present invention includes a radio frequency receiver 601 for processing a radio frequency received through the antenna 600 and outputting a digital signal, and a group code generator 602 for generating a group code. ), A first correlator 603 for correlating the group code from the group code generator 602 with the I-channel signal from the radio frequency receiver 601 for a predetermined time, and a cell for generating a cell code. A second correlator 605 and a first correlator for correlating the cell code from the cell code generator 604 and the Q channel signal from the radio frequency receiver 601 with each other for a predetermined time. Compare the output of the correlator 603 with a first predetermined threshold and compare the sum of the output of the first correlator 603 and the output of the second correlator 605 with a second predetermined threshold; A first detector 606 that determines whether the code and the cell code are synchronized, a correlation detector 607 that receives the output of the first detector 606 and detects a cyclic code symbol using a channel identification code, and a cyclic code sequence And a matching filter 608 for outputting a correlation result between the output of the correlation detector 607, a second detector 609 for finding the maximum point among 16 input signals, and a long period code generator 610 for generating a long period code. And a microprocessor 611 for controlling each of the above components.

Next, the operation of the base station code obtaining apparatus of the terminal according to the present invention will be described in detail.

First, the radio frequency receiver 601 removes a carrier wave from a received radio signal and reproduces a spread modulated pseudo noise (PN) sequence signal. The output signal is a digital signal reconstructed into an I channel signal and a Q channel signal, respectively. In the correlators 603 and 605, a correlation period for obtaining a sufficient correlation value is defined by the number of pseudo noise (PN) codes, and can be changed according to variable needs such as channel state and magnitude of received power.

The first detector 606 determines whether the input signal is at a desired value. There are two thresholds for this. The first threshold is for determining whether the group code is synchronized, and the second threshold is for determining whether the cell code is synchronized with the group code. The thresholds may be changed according to channel conditions.

The code generators 602, 603 and 610 each generate a code for a unique purpose. For example, the group code generator 602 is loaded with a value for generating an arbitrary group code, thereby sequentially outputting group code security. Upon receiving a delay command from the microprocessor 611, the group code generator 602 shifts (delays) the generated group code by one chip and outputs it. If the code change signal is received from the microprocessor 611, the current code is deleted, another group code is loaded, and the group code is generated and moved by repeating the above process.

The correlation detector 607 detects the symbol of the cyclic code by using the channel identification code. This process is performed through the correlation between the input signal and the channel identification code which has its own, and the correlation start timing and the output timing of the correlation value are controlled by the microprocessor 611.

Matching filter 608 is composed of one shift register, the length of which corresponds to the length of the cyclic code. Each register is assigned a cyclic code bit in order. Each time a symbol is input from the front end correlation detector 607, the value of the register is shifted by one space as a whole, and at the same time, the symbol stored in each register is multiplied by the bits allocated thereto, and is output after the whole is added together. The output timing of matched filter 608 matches the slot timing and is controlled by microprocessor 611.

The second detector 609 finds the point having the largest value only for the first 16 of the input values. This point is the timing indicating the start of the frame. The timing obtained by the second detector 609 is transmitted to the long period code generator 610 as a control command by the microprocessor 611 and used as a long period code generation timing. The seed for the long period code to be generated is selected by the group code and the cell code determined at the output point of the first detector 606.

7 is a flowchart illustrating an embodiment of a method for acquiring a base station code according to the present invention.

First, the core process of the method for acquiring a base station code according to the present invention will be described. A frame synchronization process for detecting start timing of a long period code, that is, a process for obtaining frame synchronization with a cyclic code, a group code acquisition process for identifying a group code, Obtaining a group code by using frame timing and slot timing, and obtaining a cell code by identifying a cell code, that is, obtaining a cell code by using the obtained group code.

Next, an example of a method of obtaining a base station code according to the present invention will be described in detail with reference to FIG. 7.

First, the terminal detects a symbol (same as a bit) timing of the cyclic code through a matching filter for channel identification code for the pilot channel (701). In this case, since the output of the matching filter is calculated in units of chips and the channel identification code is composed of N chips, the symbol timing can be detected using only N outputs. The first N outputs produced at the beginning of operation are ignored for accuracy of symbol timing. In this process, the largest output time point is regarded as symbol timing. Once symbol timing is detected, only the matched filter output for the channel identification code at that time is input to the matched filter for the cyclic code. The symbol signal input to the cyclic code matching filter has both forms and may be selectively determined in any one form. One type is the output signal of the matching filter for the channel identification code itself, which is directly input to the matching code for the cyclic code without any processing. Another is a binary signal restored to the original signal (+1 or -1) by direct determination.

Thereafter, the maximum output time point of the matched filter for the cyclic code is examined to detect the long period code timing (702). In this case, since the length of the long period code and the length of the frame are the same, the long period code timing means code frame synchronization. The matched filter for the cyclic code receives one input and produces one output at slot intervals. Therefore, the long period code timing is confirmed by detecting an output time point having a maximum value from N _c outputs corresponding to the length of the cyclic code. Again, the first N _c outputs produced at the beginning of operation are ignored for long-term code timing accuracy.

Next, the group code is loaded into the group identification code part to update the group code (703). Since the start point of the frame obtained in the long period code detection process 702 coincides with the start point of the slot and also coincides with the start point of the group code, the group code can be generated at this time or after the start of each slot.

Thereafter, the generated group code is correlated with the received I pilot code (704). This process consists of multiplying the two input codes with each other and accumulating them for the entire interval or partial interval of the group code and then outputting them.

Next, it is determined whether synchronization is obtained by comparing the threshold with the correlation output 704 (705). If the threshold value is larger than the correlation output, the group code loaded in the group code update process 703 is regarded as not the group code to be acquired, and after the new group code is loaded in the group code update process 703, Follow the process of. As a result of the determination 705, if the correlation output exceeds the threshold, it is regarded as synchronized and the following process is performed. The group code acquisition process (703 to 705) is performed once for each code belonging to the group code set. By doing this, the process of moving and correlating one chip over the entire group code can be omitted and the time required is greatly reduced.

Thereafter, one cell code belonging to the obtained group code is loaded and generated one by one in the cell identification code part (706). At this time, since the cell code start point coincides with the group code start point, the cell code is generated in accordance with the start point of the group code.

Next, both the generated group / cell code and the received I / Q pilot code are correlated (707). The result of multiplying two input codes by each other is the sum of I and Q powers. Subsequently, the cell code is accumulated for the entire interval or a partial interval and then outputted as a correlation value at the end. The group code used in this process is obtained in the group code synchronization determination step 705.

Thereafter, whether to acquire synchronization is determined by comparing the threshold with the correlation output 707 (708). If the correlation output exceeds the threshold value, the pilot code is considered to be synchronized, and the long period code corresponding to the group code and the cell code obtained in the above process is loaded in the long period code part and the base station code acquisition process is terminated. In the determination result 708, if the threshold is larger than the correlation output, the cell code loaded in the cell code update process 706 is regarded as not the cell code to be acquired, and the new cell in the cell code update process 706 again. After loading the code, repeat the process. If all the cell codes are used in the cell code synchronization processes 706 to 708, but the synchronized code is not found (709), the symbol timing detection process 701 is repeated. The cell code synchronization process (706 to 708) is performed once for each code for all cell codes belonging to the group code.

On the other hand, in the above embodiment has been described an example of dividing the frame into a plurality of slots and inserting the cyclic code of the same period as the frame at the end of every slot, in another embodiment divides the frame into a plurality of slots and the front end of every slot It may be implemented by inserting the cyclic code of the same period as the frame.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

As described above, the present invention can reduce the process of sequentially repeating the movement generation and synchronization determination over the entire group code for code synchronization in the group code acquisition process, and also for long period code synchronization in the frame synchronization process. It is possible to reduce the process of repeating the movement generation and the synchronization determination sequentially over the code throughout, so that the base station code can be obtained quickly.

Claims (20)

In the pilot / traffic channel signal transmission apparatus using a cyclic code, Group identification code generating means for generating a short period group code; Cell identification code generating means for generating a short period cell code; Channel identification code generating means for generating a channel identification code used for identifying each channel in the base station; Cyclic code generating means for generating a cyclic code having the same period as the pilot transmission frame; Long period code generating means for generating a long period code having the same period as the pilot transmission frame; Seventh spreading modulation means for spreading modulation by multiplying the generated cyclic code by the channel identification code; An eighth spreading modulation means for spreading modulation by multiplying the generated long period code by a channel identification code; Switch control means for generating a control signal in accordance with control from the outside; Switching means for switching signals and logic zero values (0) output from said group identification code generating means, cell identification code generating means, channel identification code generating means, seventh and eighth spreading modulation means in accordance with said control signal; Pilot signal processing means for processing a pilot signal; Control / traffic signal processing means for processing the control signal and the traffic signal; A first code for spreading modulation by multiplying the group code from the pilot signal processing means by the switched group identification code or logical zero value (0) and by multiplying by the switched channel identification code or the output signal of the seventh spreading modulation means; Third diffusion modulation means; A second for multiplying and modulating a cell code from the pilot signal processing means by the switched cell identification code or a logical zero value (0) and by multiplying by the switched channel identification code or an output signal of the seventh spreading modulation means; Fourth diffusion modulation means; Fifth and sixth spreading modulation means for spreading modulation by multiplying a signal from the control / traffic signal processing means with an output signal of the switched channel identification code or the eighth spreading modulation means; Linear combining means for combining signals of each of the spread modulated channels; And Radio frequency transmitting means for transmitting the combined signal Pilot / traffic channel signal transmission apparatus using a cyclic code made of a. The method of claim 1, The switching means, First switching means for switching a group identification code or a logical zero value from said group identification code generating means to said first spreading modulation means in accordance with a control signal from said switching control means; Second switching means for switching a cell identification code or a logic zero value from said cell identification code generating means to said second spreading modulation means in accordance with a control signal from said switching control means; Third switching means for switching the channel identification code from the channel identification code generation means or the signal from the seventh diffusion modulation means to the third diffusion modulation means in accordance with a control signal from the switching control means; And Fourth switching means for switching the channel identification code from the channel identification code generation means or the signal from the eighth diffusion modulation means to the fourth diffusion modulation means in accordance with a control signal from the switching control means Pilot / traffic channel signal transmission apparatus using a cyclic code made of a. In the pilot / traffic channel signal transmission apparatus using a cyclic code, Pilot signal processing means for processing a pilot signal; Control / traffic signal processing means for processing the control signal and the traffic signal; Means for dividing a pilot frame consisting of a pilot code into a predetermined number of slots, and inserting a cyclic code for frame synchronization in each of the divided slots to form a pilot transmission frame in which a pilot code and a cyclic code appear alternately; Linear combining means for respectively combining signals of each channel; And Radio frequency transmitting means for transmitting the combined signal Pilot / traffic channel signal transmission apparatus using a cyclic code made of a. The method of claim 3, wherein Inserting a cyclic code for frame synchronization for each slot, Pilot / using a cyclic code, characterized in that a period corresponding to the length of a spreading code is placed at the end of each divided slot, and a cyclic code having a length equal to the number of slots, i.e., a period equal to a pilot transmission frame, is inserted therein. Traffic channel signal transmission device. The method of claim 3, wherein Inserting a cyclic code for frame synchronization for each slot, Pilot / using a cyclic code, characterized in that a cyclic code having a length equal to the number of slots, i.e., a period equal to a pilot transmission frame, is inserted in a section corresponding to the length of a spreading code in front of each divided slot. Traffic channel signal transmission device. In the pilot / traffic channel signal transmission method applied to a pilot / traffic channel signal transmission apparatus using a cyclic code, A first step of dividing a pilot frame consisting of pilot codes into a predetermined number of slots; A second step of forming a pilot transmission frame in such a manner that a pilot code and a cyclic code appear alternately by inserting a cyclic code for frame synchronization in each of the divided slots; And Third step of combining and transmitting the signals of each channel Pilot / traffic channel signal transmission method using a cyclic code comprising a. The method of claim 6, Inserting the cyclic code of the second step, Pilot / using a cyclic code, characterized in that a segment corresponding to the length of the spreading code at the end of each divided slot and a cyclic code having the same length as the number of slots, that is, the same period as the pilot transmission frame Traffic channel signal transmission method. The method of claim 6, Inserting the cyclic code of the second step, Pilot / with a cyclic code, characterized in that a cyclic code having a length equal to the number of slots, i.e., a period equal to a pilot transmission frame, is inserted in a section corresponding to the length of a spreading code in front of each of the divided slots. Traffic channel signal transmission method. In the base station code acquisition device of a terminal using a cyclic code, Radio frequency receiving means for processing a radio frequency received through the antenna and outputting a digital signal; Group code generating means for generating a group code; First correlation means for correlating and outputting a group code from said group code generating means and a group code signal from said radio frequency receiving means by a first predetermined time; Cell code generating means for generating a cell code; Second correlation means for correlating and outputting a cell code from said cell code generating means and a cell code signal from said radio frequency receiving means for a second predetermined time; Whether the group code and the cell code are synchronized by comparing the output of the first correlation means with a first predetermined threshold and comparing the sum of the output of the first correlation means and the output of the second correlation means with a second predetermined threshold; First detecting means for determining; Correlation detecting means for receiving the output of the first detecting means and detecting a cyclic code symbol using a channel identification code; Matched filtering means for outputting a correlation result between the cyclic code sequence and the output of the correlation detecting means; Second detecting means for finding a maximum point among a predetermined number of input signals; Long period code generating means for generating a long period code; And Control means for controlling the respective components Apparatus for acquiring base station code of a terminal using a cyclic code comprising a. In the base station code acquisition method applied to the base station code obtaining apparatus using a cyclic code, A first step of acquiring frame synchronization (time at which one cycle of the long period code starts) using the cyclic code; A second step of acquiring synchronization of a group code using the frame synchronized time point; And A third step of acquiring a cell code using the group code synchronization time point and a group code Base station code acquisition method using a cyclic code made of a. The method of claim 10, The first step is, A fourth step of detecting symbol timing of the cyclic code through a matched filter for channel identification code; And The fifth step of detecting the long period code timing by checking the maximum output time of the matched filter for the cyclic code Base station code acquisition method using a cyclic code made of a. The method of claim 11, The fourth step, A sixth step of detecting symbol timing by using a matching filter for channel identification code synchronization; A seventh step of inputting to a matching filter for cyclic code synchronization without performing any processing on the symbol signal output from the symbol timing detected in the sixth step; And An eighth step of detecting a maximum output time point from an output of the circulating code matching filter; Base station code acquisition method using a cyclic code made of a. The method of claim 11, The fourth step, A sixth step of detecting symbol timing by using a matching filter for channel identification code synchronization; A seventh step of directly determining a symbol signal output from the symbol timing detected in the sixth step, restoring an original bit value, and inputting it to a matching filter for cyclic code synchronization; And An eighth step of detecting a maximum output time point from an output of the circulating code matching filter; Base station code acquisition method using a cyclic code made of a. The method of claim 10, The second step, A fourth step of generating a group code in accordance with the frame start time synchronized in the first step; A fifth step of correlating the group code generated in the fourth step with the received group code (I pilot code); A sixth step of determining whether to acquire synchronization by comparing a predetermined first threshold value with a correlation value in the fifth step; And As a result of the determination in the sixth step, if the predetermined first threshold is greater than the correlation value, the operation is repeated from the fourth step. If the predetermined first threshold is less than the correlation value, the third value is regarded as being synchronized. 7th Step to Step Base station code acquisition method using a cyclic code made of a. The method according to claim 10 or 14, The second step, A base station code acquisition method using a cyclic code, characterized in that performed once for each code belonging to a group code set. The method of claim 10, The third step, A fourth step of generating a cell code belonging to the group code obtained in the second step according to a group code start time; A fifth step of correlating the generated group / cell code with the received group / cell code (I / Q pilot code); A sixth step of determining whether to acquire synchronization by comparing a second predetermined threshold value with a correlation value in the fifth step; And As a result of the determination in the sixth step, if the predetermined second threshold is smaller than the correlation value, the pilot code is regarded as synchronized and a long period code corresponding to the obtained group code and cell code is generated to obtain a base station code. A seventh step of repeating from the fourth step if the second predetermined threshold value is larger than the correlation value; Base station code acquisition method using a cyclic code made of a. The method of claim 16, Eighth step of repeating from the first step if all cell codes are used in the seventh step, but the synchronized code is not found Base station code acquisition method using a cyclic code made further comprising. The method according to any one of claims 10, 16 or 17, The third step, The base station code acquisition method using a cyclic code, characterized in that for performing all the cell code belonging to the obtained group code once for each code. In a pilot / traffic channel signal transmission apparatus having a microprocessor, A first function of dividing a pilot frame consisting of pilot codes into a predetermined number of slots; A second function of inserting a cyclic code for frame synchronization in each of the divided slots to form a pilot transmission frame such that a pilot code and a cyclic code appear alternately; And Third function for combining and transmitting signals of each channel A computer-readable recording medium having recorded thereon a program for realizing this. In a base station code acquisition device having a microprocessor, A first function of acquiring frame synchronization (time at which one cycle of a long period code starts) using a cyclic code; A second function of acquiring synchronization of a group code by using the frame synchronized time point; And A third function of acquiring a cell code using the group code synchronization time point and a group code A computer-readable recording medium having recorded thereon a program for realizing this.