KR20060070134A - Pilot symbol searching apparatus and it's method of mobile-type broadcasting receiver - Google Patents

Abstract

The present invention relates to a PS search apparatus and a method for increasing a delay spread time that can be received through a PS search in a mobile broadcast receiver. In particular, the present invention measures the signal variation of the pilot channel during the pilot symbol interval generated by using the determination result after first determining the signal captured point of each path as a pilot symbol interval, and measures the amount of data variation of the pilot channel during the data interval. Then, it is finally determined whether the signal captured point of each path is a PS section or a data section. Therefore, the maximum delay time of the multipath that can be received can be doubled, thereby improving the receiver's reception performance.

DMB, pilot symbol

Description

Pilot symbol searching apparatus and it's method of mobile-type broadcasting receiver

1 is a block diagram of a typical satellite DMB receiver

2 is a view showing a frame structure of a typical satellite DMB pilot channel

3 is a table showing signal configuration of a pilot channel of FIG.

4 is a general diagram illustrating an example of multiple paths with a time delay;

5 is a block diagram illustrating a configuration of a satellite DMB receiver equipped with a PS discovery apparatus according to the present invention.

6 is a detailed block diagram of the PS search unit of FIG. 5;

Explanation of symbols for main parts of the drawings

281 ~ 28n: PS search unit

30: PS timing predictor 40: first data measurement unit

50: second data measuring unit 60: comparator

41,51,47,57: Integrator 42,52: Delay

43,53: Conjugate 44,54: Multiplier

45,55: Real operator 46,56: Sign discriminator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile broadcast receiver. In particular, a satellite digital multimedia broadcasting (DMB) receiver expands a delay spread time that can be received through pilot symbol (PS) search of a pilot channel during signal synchronization. An apparatus and method are provided.

Digitalization of broadcasts has made digital multimedia broadcasting (DMB) possible, encompassing data transmission and multimedia services. The DMB is robust against noise and distortion on a transmission channel, has a high transmission efficiency, and has various advantages of enabling various multimedia services.

The satellite DMB adopted and used in Korea is based on the Japanese-style System E system and consists of performance equipment, earth stations, satellites, terrestrial relay equipment and subscriber receivers.

The satellite DMB system transmits multimedia content from the earth station transmission center to the satellite by using a code division multiplexing (CDM) transmission method, and the user directly receives it from the satellite or uses a gap filler in a shaded area where the signal strength is weak. It is received from the ground auxiliary relay facility called Gap Filler.

The transmission channel of the satellite DMB is a wireless mobile reception channel, and the amplitude of the received signal is not only time-varying, but also the Doppler shift of the received signal spectrum occurs due to the movement reception. In consideration of the transmission and reception under such a channel environment, the satellite DMB transmission scheme adopts the CDM scheme, and interleaves the time domain signals to correct errors occurring in the transmission channel.

In the CDM scheme, broadcast programs are independently transmitted from each other using a 64-bit Walsh code, which is an orthogonal code. At this time, the data to be transmitted is multiplied by a 2048-bit Pseudo Noise (PN) signal having a much faster rate than the data to be transmitted by frequency spreading.

Since the CDM method has a signal over a wide band, it has a strong characteristic against narrow band interference and can reduce reception performance due to multiple paths through a receiver having a RAKE structure.

That is, in the satellite DMB transmitter, an error correction code is added to transmission data of a plurality of channels, multiplied by different WALSH codes for each channel, and multiplied by a PN code to generate and transmit a CDM signal.

1 shows a conceptual block diagram of a general satellite DMB receiver for receiving such CDM signal. That is, the tuner 10 tunes only the RF signal of a specific frequency among the RF signals received by the antenna, converts the baseband into baseband, and outputs the result to the Auto Gain Control (AGC) unit 11.

The AGC unit 11 keeps the magnitude of the signal output from the tuner 10 constant and outputs it to the A / D converter 12. To this end, the AGC unit 11 measures the power of the received signal and multiplies the calculated gain by the received signal.                         

The A / D converter 12 samples the signal having a relatively constant magnitude by the AGC unit 11 and converts the analog signal into a digital signal. The digitized signal is output to a searcher 13 and a tracker of each finger 141 to 14n for demodulation. Each of the fingers 141 to 14n includes a tracker and a despreading unit.

In other words, in order to demodulate a signal in the CDM transmission scheme, the acquisition of a Pseudo Noise (PN) signal used for spreading the signal should be prioritized. This process involves two steps: acquisition and tracking of the signal. Is made of.

The division unit of the PN signal is called a chip, and signal acquisition is a process of securing signal synchronization within ± 1/2 chips at a receiver, and is performed by the search unit 13. In addition, the signal tracking refers to finely synchronizing the found signals, and is performed in a tracker of each finger 141 to 14n. The despreading unit of each finger 141 to 14n despreads by multiplying the signal synchronized by the signal acquisition and tracking with the PN signal generated by the receiver, and by multiplying the corresponding WALSH code used to distinguish the CDM channels. The symbol of the desired CDM channel is extracted.

As described above, the signal tracking and despreading processes are performed in all the multi-paths searched by the search unit 13, and each of them is called a finger. In other words, signals received through different paths are assigned to the arbitrary fingers by the search unit 13 and demodulated. Here, there may be various ways of allocating a finger, for example, a pilot signal may be used.                         

In this case, PN signals used for frequency spreading are cut out of 2048 pieces in a maximum period sequence (m-sequence) having a period of 4095, and can be used to find synchronization of a multipath. Therefore, the maximum delay for detachable multipath is 2048 chip hours, or 128usec.

The CDM symbols of the respective paths extracted by the fingers 141 to 14n are output to the RAKE synthesizer 16 and to the frequency offset estimator 15 to compensate for the frequency offset.

The frequency offset estimator 15 estimates the frequency offset for each finger, synthesizes it, and feeds it back to the tuner 10 to compensate for the frequency offset.

The rake synthesizer 16 compensates the signal delay of the CDM symbols output from the fingers 141 to 14n, and then synthesizes the rake synthesizer 16. In this case, a method of improving reception performance by estimating and receiving channel environment is compensated. You may get drunk. That is, the rake synthesizer 16 performs rake synthesis on all CDM channels for demodulation.

The signal synthesized by the rake synthesizer 16 is output to the frame and superframe timing extractor 17 and the time deinterleaving unit 19.

The frame and superframe timing extractor 17 extracts the timing of the frame and superframe from the synthesized symbol by using a pilot channel as a control channel and outputs the timing to the pilot convolutional decoder 18.

Before describing the pilot channel, related terms are first defined.                         

That is, the pilot information means information about transmission control and the like related to the CDM. The pilot channel refers to a signal generated as a unit of a 408-byte signal derived from a synchronization signal, a frame synchronization signal, a super frame synchronization signal, and a signal in which an error correction external code is added to the pilot information. The pilot channel performs spreading by multiplying the W0 code at the transmitting side, which is also referred to as a pilot signal.

FIG. 2 is a diagram illustrating a frame structure of such a satellite DMB pilot channel, in which one superframe, which is a transmission unit, is composed of six subframes, and each frame further includes 51 control data units D1 to D51 and respective control data. It consists of a pilot symbol (PS) inserted before the part. At this time, the pilot symbol PS is inserted every 250usec and transmitted together with the control data unit indicated by D1 to D51.

3 is a table showing the meanings of the pilot symbols PS and the control data units D1 to D1 described above.

That is, the pilot symbol PS is composed of 32 consecutive bits of '1' and is used for multi-path searching of the satellite DMB receiver, and D1 is used to determine whether the receiver is synchronized by transmitting in a 32-bit predefined pattern. do. D2 is a frame counter and is used to keep the superframe in sync. D3 to D22 and D27 to D46 contain pilot information, and D23 to D26 and D47 to D50 contain error correction outer codes. And D51 includes extended information.

The pilot convolutional decoder 18 performs convolutional decoding on the pilot channel in the reverse process of the transmitting side and outputs the convolutional decoding to the pilot deinterleaving unit 20. The pilot deinterleaving unit 20 performs byte deinterleaving on the convolutional decoded pilot channel in the reverse process of the transmitter and outputs the result to the pilot RS decoder 22. The pilot RS decoder 22 performs RS decoding on the reverse byte of the byte deinterleaved pilot channel and outputs the decoded data to the data mode detector 24. The data mode detector 24 detects information on the interleaver size and convolutional coding rate from the RS decoded pilot channel and outputs the information to the time deinterleaving unit 19 and the convolutional decoder 21. The time deinterleaving unit 19 receives the interleaved size information and performs time deinterleaving on the data channel output from the rake synthesizer 16 and outputs the interleaved decoder 21 to the convolutional decoder 21. The convolutional decoder 21 receives information on the convolutional coding rate, performs convolutional decoding on the time deinterleaved data channel, and outputs the convolutional decoding to the RS decoder 25. The RS decoder 25 decodes the A / V data by performing RS decoding on the convolutional decoded data channel and outputting the decoded data to the A / V data decoder 26.

On the other hand, there are multiple paths in a wireless reception environment, and the delay times are different. Therefore, if the satellite DMB receiver can increase the tolerance of these delay differences, the reception performance will be improved.

Accordingly, an object of the present invention is to provide an apparatus and method for increasing the maximum delay time of a multipath that can be received through pilot symbol search of a pilot channel after synchronization of a PN signal.

In order to achieve the above object, a pilot symbol search apparatus of a mobile broadcast receiver according to an embodiment of the present invention, a pilot channel in which a plurality of pilot symbol (PS) section and data section are alternately arranged from a signal tracked signal A pilot channel extraction unit to extract; A pilot timing predictor for first determining a signal captured point as a pilot symbol interval and outputting a signal for distinguishing the pilot symbol interval and the data interval; A first data measuring unit measuring an amount of change in data of a pilot channel during a pilot symbol period output from the PS timing predictor; A second data measuring unit measuring a data change amount of a pilot channel during a data section output from the PS timing predictor; And a comparison unit configured to finally determine a signal captured point of a corresponding path as a pilot symbol section of a pilot channel and a data section if the data change amount of the first data measuring unit is smaller than the data change amount of the second data measuring unit. A search unit is provided for each finger.

According to another embodiment of the present invention, a PS search apparatus of a mobile broadcast receiver may include: a pilot channel extracting unit configured to extract a pilot channel in which a plurality of pilot symbol sections and data sections are alternately arranged from a signal tracked signal; A pilot timing predictor for first determining a signal captured point as a pilot symbol interval and outputting a signal for distinguishing the pilot symbol interval and the data interval; A first data measuring unit for integrating data of a pilot channel during a pilot symbol interval output from the PS timing predictor, performing a conjugate product with an integral value of a previous symbol interval, and accumulating code values of a real component; A second data measuring unit for integrating data of a pilot channel during a data interval output from the PS timing predictor, performing a conjugate product with an integral value of a previous data interval, and accumulating code values of a real component; When the cumulative value of the first data measuring unit reaches a preset threshold before the cumulative value of the second data measuring unit, the signal captured point of the corresponding path is finally determined as a pilot symbol interval of a pilot channel and vice versa as a data interval. A PS search unit configured to include a comparison unit for each finger is characterized in that it is provided.

A pilot symbol (PS) search method of a mobile broadcast receiver according to an embodiment of the present invention,

(a) extracting a pilot channel in which a plurality of PS sections and data sections are alternately arranged from the signal tracked signal;

(b) first determining the signal captured point as a pilot symbol interval and outputting a signal for distinguishing a pilot symbol interval from a data interval;

(c) measuring an amount of change in data of the pilot channel during the pilot symbol period according to the division signal of step (b);

(d) measuring a change amount of data during the data period according to the division signal of step (b); And

(e) if the first data change amount is less than the second data change amount, each finger of the PS search process comprising the step of finally determining the signal captured point of the corresponding path to the pilot symbol interval of the pilot channel, if the data interval is large; It is characterized by performing as much.

PS search method of a mobile broadcast receiver according to another embodiment of the present invention,                     

(a) extracting a pilot channel in which a plurality of pilot symbol (PS) sections and data sections are alternately arranged from the signal tracked signal;

(b) first determining the signal captured point as a pilot symbol interval and outputting a signal for distinguishing a pilot symbol interval from a data interval;

(c) integrating data of the pilot channel during the pilot symbol period according to the division signal of step (b), performing a conjugate product with the integral value of the previous symbol period, and accumulating the code values of the real component;

(d) integrating data of the pilot channel during the data interval according to the division signal of step (b), performing a conjugate product with the integral value of the previous data interval, and accumulating the code values of the real component; And

(e) If the cumulative value of step (c) reaches a preset threshold before the cumulative value of step (d), the signal captured point of the corresponding path is moved to the pilot symbol interval of the pilot channel and vice versa. It is characterized in that the PS search process including the final step of determining is performed for each finger.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described. At this time, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, by which the technical spirit of the present invention and its core configuration and operation is not limited. .

The same components as in the related art are denoted by the same names and the same reference numerals for convenience of description, and detailed description thereof will be omitted.

In general, a satellite DMB system removes 2048 out of 40 m-sequences of a period 4095 as a pseudo noise (PN) signal for frequency spreading as described above. The chip rate of this PN signal is 16.384 Mcps and the time for one cycle is 128usec. That is, in the frame structure of the pilot channel shown in FIG. 2, one spread signal is present in one PS or Dn. The signal acquisition process performed by the search unit 13 is a process of finding the starting point of the PN signal using the auto-correlation characteristic of the PN signal. If the PN generator of the transmitter / receiver is synchronized, auto-correlation value peaks because there is no data modulation in the PS section, but in Dn section, as shown in FIG. This results in the autocorrelation not peaking. However, if the value of the Dn section is the same value or less change during the capture process due to noise or the like, the autocorrelation value also has a very large value, and thus this point is determined as the starting point of the PN.

In this case, the following problems may occur. In the example of FIG. 4, if multipath 1 precedes path 2, but the PN starting point of path 1 is determined to be point B, and the path 2 is determined to be C during path acquisition, path 2 is determined as if it was ahead. Will be.

However, if PS and Dn can be distinguished, this problem does not occur.                     

Therefore, the present invention is characterized in determining whether the starting point of the PN signal found by the search unit 13 is the PS section or the Dn section of the pilot channel.

FIG. 5 is a block diagram illustrating an exemplary embodiment of a satellite DMB receiver equipped with a PS searcher according to the present invention. Each finger includes PS searchers 281 through 28n and outputs the searcher 13. PS search is performed for each finger by receiving the output of the despreader of each finger.

At this time, since the internal configuration of each of the PS search units 281 to 28n is the same, only one PS search unit will be described with reference to FIG. 6.

Each PS search unit receives a pilot channel extracted from the corresponding despreader 29 and an output of the searcher 13 to measure a transition amount of data during a first section of the pilot channel ( 40) a change in data during a second section of the pilot channel connected to the first data measuring unit 40 in parallel and receiving the pilot channel extracted from the despreader 29 and the output of the searcher 13. comparing the results of the second data measuring unit 50 and the first and second data measuring units 40 and 50 measuring the amount of transition, and whether the PN starting point found by the search unit 13 is a PS section, Comparator 60 for finally determining whether or not the Dn section and outputs the result to the rake synthesizer 16.

The first data measuring unit 40 includes an integrator 41, a delay unit 42, a conjugator 43, a multiplier 44, a real operator 45, a code discriminator 46, and an integrator 47. It consists of.

The second data measuring unit 50 includes an integrator 51, a delay unit 52, a conjugator 53, a multiplier 54, a real operator 55, a code discriminator 56, and an integrator 57. It consists of.                     

In the present invention configured as described above, the point captured by the search unit 13 is temporarily determined as the PN start point of the PS section. If the preliminary judgment is incorrect, the predictions for the PS and Dn sections are interchanged. In order to judge the right and wrong about this judgment, the data is included in the Dn section.

That is, since the PS section always contains data of 1 as shown in FIG. 3, if the amount of data change in the PS section is greater than the Dn section, the amount of data transition is determined during the provisionally determined PS section and the Dn section. Decisions are considered wrong and reverse the predictions for the PS and Dn intervals.

To this end, the first and second data measuring units 40 and 50 measure the amount of change in data during different sections of the pilot channel.

According to an exemplary embodiment of the present invention, the first data measuring unit 40 measures the amount of change of data during the PS period of the pilot channel, and the second data measuring unit 50 measures the amount of change of data during the Dn period of the pilot channel. Assume that we measure

In this case, if it is determined that the amount of change in data measured by the first data measurer 40 is smaller than the amount of change in data measured by the second data measurer 50, the provisional determination described above is correct. In other words, the point captured by the search unit 13 becomes the PN starting point of the PS section.

If the opposite is true, the provisional judgment is wrong, and the point captured by the search unit 13 becomes the PN start point of the Dn section.

A detailed description of the operation is as follows.

That is, if the transmission signal is s (t), it can be expressed as in the following equation (1).                     

In Equation 1, c (t) denotes a pseudo noise (PN) signal used for spreading, w (t) denotes a WALSH signal used for CDM channel classification, and b (t) denotes a CDM channel. Represents the data. N denotes the number of multiplexed CDM channels.

At this time, the transmitted signal is distorted in the magnitude and phase of the signal while undergoing a wireless environment, and because there is a frequency offset of the transmitting and receiving end, it is converted to the baseband by the tuner 10, and then digitally passed through the A / D converter 12. The signal is expressed as in Equation 2 below.

Α represents a change in signal amplitude due to a wireless environment, φ represents a change in phase, and Δ f represents a frequency offset of a transceiver. N denotes reception noise, and n denotes an index of a chip.

Accordingly, the despreader 29 performs PN despreading and WALSH despreading on the signal output from the tracker of the finger to extract only the pilot channel among the n channels multiplexed. That is, when PN despreading is performed by multiplying a signal output from the tracker with a PN signal, c (t), which is a pseudo noise used for spreading, is removed. Subsequently, when the signal from which c (t) is removed is multiplied by the W0 code used for spreading the pilot channel among the WALSH codes, the WALSH despreading is performed to extract the pilot channel from the n channels of the CDM.

In this case, since the W0 code is composed of '1111 ... 11', W0 despreading only exists semantically, and hardware implementation is unnecessary.

The pilot channel extracted by the despreader 29 is output to the integrators 41 and 51 of the first and second data measuring units 40 and 50.

Since the WALSH codes are orthogonal to each other, the components whose k ≠ 0 of s (t) are removed through W0 despreading as long as the integral section of the integrators 41 and 51 is an integer multiple of the WALSH code period. That is, the components of the other channels except for the pilot channel are removed from the received CDM signal.

In Equation 1, the value k is an index of CDM channels, and if k = 0, a pilot channel is represented, and if k ≠ 0, other data channels are represented.

On the other hand, the output of the search unit 13 is input to the PS timing predictor 30. When the PS timing predictor 30 receives the acquisition signal from the searcher 13, the PS timing predictor 30 detects a PS section and generates a timing pulse according to the integrators 41 and 51 of the first and second data measuring units 40 and 50. Will output For example, in the present invention, it is assumed that a high section of the timing pulse is a PS section, and a low section is a Dn section.

Then, the integrator 41 of the first data measuring unit 40 accumulates the pilot signal during the high period of the timing pulses output from the PS timing predicting unit 30, and outputs the pilot signal to the delay unit 42 and the multiplier 44. The second data measuring unit 50 accumulates the pilot signal during the low period among the timing pulses output from the PS timing predicting unit 30 and outputs the pilot signal to the delay unit 52 and the multiplier 54.

This is because the first data measuring unit 40 measures the amount of data change during the PS period in the embodiment of the present invention.

At this time, the delay unit 42 of the first data measuring unit 40 delays the output of the integrator 41 for a predetermined time period, for example, for one symbol period, and outputs the result to the conjugator 43, and the conjugator 43 Concatenates the output of delay 42 and outputs to multiplier 44. The multiplier 44 multiplies the output of the integrator 41 by the output of the conjugator 43 and outputs the multiplier 44 to the real calculator 45. The real calculator 45 takes only the real component of the output of the multiplier 44 and outputs it to the code discriminator 46.

On the other hand, in the second data measuring unit 50 as well, the delay unit 52 delays the output of the integrator 51 for a predetermined time period, for example, for one symbol period, and outputs the result to the conjugator 53. Gator 53 conjugates the output of delay 52 to output to multiplier 54. The multiplier 54 multiplies the output of the integrator 51 by the output of the conjugator 53 and outputs the multiplier 54 to the real calculator 55. The real calculator 55 takes only the real component of the output of the multiplier 54 and outputs it to the code discriminator 56.

이 된다. 이 값이 부호 판별기(46,56)를 통하고 나면, PS 구간 동안은 1, Dn 구간 동안은 ±1이 되고, 적분기(47,57)에서 일정 시간 동안 누적된 후 비교기(60)로 출력된다. 일 예로, 상기 적분기(47,57)의 적분 구간은 상기 적분기(47,57)의 출력 중 하나가 비교기(47,57)에서 설정된 임계값보다 커질때까지로 할 수도 있다. In the ideal case, if the symbol size is 1, the output of the real-time calculation unit 45, 55 is 1 in the PS section where there is no change of data, and in the Dn section,

Becomes After this value passes through the sign discriminator (46, 56), it becomes 1 during the PS section and ± 1 during the Dn section, accumulates for a predetermined time in the integrator (47, 57), and then outputs to the comparator (60). do. As an example, the integration period of the integrators 47 and 57 may be until one of the outputs of the integrators 47 and 57 is larger than the threshold set by the comparators 47 and 57.

The comparator 60 compares each cumulative value of the integrators 47 and 57 with a predetermined threshold value to determine which one is larger than the threshold value, and outputs a signal according to the rake synthesizer 16.

If the output of the integrator 47 of the first data measuring unit 40 is first larger than the preset threshold value, that is, the amount of data change is small, it is preliminarily determined that the point captured by the searching unit 13 is the PN starting point of the PS section. This is right. On the contrary, when the output of the integrator 57 of the second data measuring unit 50 becomes larger than the preset threshold value, the preliminary determination that the point captured by the searching unit 13 is the PN starting point of the PS section is incorrect.

In this way, the correct position of the PS may be determined by determining the right and wrong of the provisional judgment based on the result of the comparator 60. And even if the assumption is wrong, the start of Dn can be determined as the start of PN without discarding the result.

On the other hand, the terms used in the present invention (terminology) are terms defined in consideration of the functions in the present invention may vary according to the intention or practice of those skilled in the art, the definitions are the overall contents of the present invention It should be based on.

The present invention is not limited to the above-described embodiments, and can be modified by those skilled in the art as can be seen from the appended claims, and such modifications are within the scope of the present invention. .

According to the PS search apparatus and method of the mobile satellite broadcast receiver according to the present invention described above, the PN starting point found in the signal acquisition process by measuring the amount of data change during the PS section and the Dn section of the pilot channel, whether the PS section, Dn section By distinguishing cognition, it is possible to avoid misjudgment of an incoming route first into an incoming route later. In addition, the maximum latency of a multipath that can be received can be doubled, improving receiver reception performance.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (9)

In the PS search apparatus of a mobile broadcast receiver comprising a plurality of fingers to extract the CDM symbol of a specific channel through the PN despreading and WALSH despreading after the acquisition and tracking of the signal received through the path, A pilot channel extracting unit extracting a pilot channel in which a plurality of pilot symbol sections and data sections are alternately arranged from the signal tracked signal; A pilot timing predictor for first determining the signal captured point as a pilot symbol interval and outputting a signal for distinguishing a pilot symbol interval from a data interval; A first data measuring unit measuring an amount of change in data of a pilot channel during a pilot symbol period output from the PS timing predictor; A second data measuring unit measuring a data change amount of a pilot channel during a data section output from the PS timing predictor; And A PS search comprising a comparison unit for finally determining a signal captured point of a corresponding path to a pilot symbol section of a pilot channel and a data section if the data change amount of the first data measurer is less than the data change amount of the second data measurer. PS search device of a mobile broadcast receiver, characterized in that the unit is provided for each finger. The method of claim 1, wherein the first data measuring unit A first integrator for accumulating and outputting pilot channel data during a PS symbol period output from the PS timing predictor; A delay and conjugator for conjugating the output of the first integrator by a predetermined time; An arithmetic unit for multiplying the output of the first integrator by the conjugated previous output and taking only a real component and determining a sign thereof; And a second integrator that accumulates and outputs the code determined by the calculating unit for a predetermined integration period. The method of claim 1, wherein the second data measuring unit A third integrator for accumulating and outputting data of a pilot channel for a data period output from the PS timing predictor; A delay and conjugator for conjugating the output of the third integrator by a predetermined time; An arithmetic unit for multiplying the output of the third integrator by the conjugated previous output and taking only a real component and determining a sign thereof; And a fourth integrator configured to accumulate and output a code determined by the calculator for a predetermined integration period. The method of claim 2, wherein the comparison unit When the cumulative value of the second integrator reaches a preset threshold before the cumulative value of the fourth integrator, the PS search of the mobile broadcast receiver is determined as a pilot symbol section of the pilot channel. Device. In the PS search apparatus of a mobile broadcast receiver comprising a plurality of fingers to extract the CDM symbol of a specific channel through the PN despreading and WALSH despreading after the acquisition and tracking of the signal received through the path, A pilot channel extracting unit extracting a pilot channel in which a plurality of pilot symbol sections and data sections are alternately arranged from the signal tracked signal; A pilot timing predictor for first determining the signal captured point as a pilot symbol interval and outputting a signal for distinguishing a pilot symbol interval from a data interval; A first data measuring unit for integrating data of a pilot channel during a pilot symbol interval output from the PS timing predictor, performing a conjugate product with an integral value of a previous symbol interval, and accumulating code values of a real component; A second data measuring unit for integrating data of a pilot channel during a data interval output from the PS timing predictor, performing a conjugate product with an integral value of a previous data interval, and accumulating code values of a real component; And When the cumulative value of the first data measuring unit reaches a preset threshold before the cumulative value of the second data measuring unit, the signal captured point of the corresponding path is finally determined as a pilot symbol interval of a pilot channel and vice versa as a data interval. And a PS search unit configured to include a comparison unit for each finger. In the method of searching for a pilot symbol (PS) of a mobile broadcast receiver including a plurality of fingers extracting CDM symbols of a specific channel through PN despreading and WALSH despreading after acquiring and tracking a signal received through a corresponding path. In (a) extracting a pilot channel in which a plurality of PS sections and data sections are alternately arranged from the signal tracked signal; (b) first determining the signal captured point as a pilot symbol interval and outputting a signal for distinguishing a pilot symbol interval from a data interval; (c) measuring an amount of change in data of the pilot channel during the pilot symbol period according to the division signal of step (b); (d) measuring a change amount of data during the data period according to the division signal of step (b); And (e) if the first data change amount is less than the second data change amount, each finger of the PS search process comprising the step of finally determining the signal captured point of the corresponding path to the pilot symbol interval of the pilot channel, if the data interval is large; PS discovery method of a mobile broadcast receiver, characterized in that performed for each. The method of claim 6, wherein step (c) Accumulating and outputting pilot channel data during a PS symbol period according to the division signal; Conjugating by delaying the integral output of the step for a predetermined time; Multiplying the integral output with the previous conjugated output to take only real components and determine the sign thereof; And accumulating the determined code for a predetermined integration period and outputting the data as an amount of change in data. The method of claim 6, wherein step (d) Accumulating and outputting data of a pilot channel during a data period according to the division signal; Conjugating by delaying the integral output of the step for a predetermined time; Multiplying the integral output with the previous conjugated output to take only real components and determine the sign thereof; And accumulating the determined code for a predetermined integration period and outputting the data as an amount of change in data. In the PS search method of a mobile broadcast receiver comprising a plurality of fingers to extract the CDM symbol of a specific channel through the PN despreading and WALSH despreading after the acquisition and tracking of the signal received through the path, (a) extracting a pilot channel in which a plurality of pilot symbol (PS) sections and data sections are alternately arranged from the signal tracked signal; (b) first determining the signal captured point as a pilot symbol interval and outputting a signal for distinguishing a pilot symbol interval from a data interval; (c) integrating data of the pilot channel during the pilot symbol period according to the division signal of step (b), performing a conjugate product with the integral value of the previous symbol period, and accumulating the code values of the real component; (d) integrating data of the pilot channel during the data interval according to the division signal of step (b), performing a conjugate product with the integral value of the previous data interval, and accumulating the code values of the real component; And (e) If the cumulative value of step (c) reaches a preset threshold before the cumulative value of step (d), the signal captured point of the corresponding path is moved to the pilot symbol interval of the pilot channel and vice versa. PS discovery process comprising the step of determining the final is performed for each finger PS discovery method of a mobile broadcast receiver.

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