JP2000196580A - Receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a time required for establishing synchronization through backward protection processing. SOLUTION: In the case that number of protection stages in the backward protection processing is not less than a prescribed frame number processed in the lump in the case of interleave processing, an initial value setting section 105 sets an identification number of a frame received first after the start of reception to a synchronization processing section 104, which confirms the consecutiveness on the basis of the identification numbers to conduct the backward protection processing. Furthermore, in the case that an error is detected on the way of processing the initial value setting section 105 sets an identification number of a frame received right after the detection of the error to the synchronization processing section 104, which confirms the consecutiveness from the identification numbers so as to conduct the backward protection processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a receiving device,
In particular, the present invention relates to a receiving apparatus for performing frame synchronization in digital communication and a backward protection processing method thereof.

[0002]

2. Description of the Related Art In a radio communication in which a signal communicated via each path is a radio signal composed of a plurality of frames, one frame of a received signal usually includes an identification number Sr used for frame synchronization. It comprises a header and a data area for storing user data.

[0003] In wireless communication in which a wireless signal has a frame structure, known techniques such as interleaving and deinterleaving (hereinafter simply referred to as "interleaving") are performed so that errors do not concentrate in one frame. . This interleaving process needs to be performed collectively for each of a predetermined number of frame groups. Identification number S
The number r is usually provided corresponding to the number of frames used for one interleaving process.

Here, for example, it is assumed that the interleaving process is performed every eight frames, and the identification number Sr is 0 to
The case of taking eight values of 7 will be described.

Hereinafter, a conventional receiving apparatus will be described with reference to FIGS. FIG. 13 is a main block diagram showing a schematic configuration of a conventional receiving apparatus, FIG. 14 is a main block diagram showing a schematic configuration of a synchronization processing section of the conventional receiving apparatus, and FIG. FIG. 7 is a flowchart illustrating an operation of a synchronization processing unit of the receiving device.

In FIG. 13, a radio signal received by an antenna 1301 is transmitted to a duplexer 1 for switching between transmission and reception.
The signal is input to the demodulator 1303 via the
03 is subjected to demodulation processing, and is converted into frame-structured bit data, that is, a baseband signal.

The baseband signal output from the demodulator 1303 is supplied to the synchronization processing unit 1304 and the channel decoder 13.
05 is input. The synchronization processing unit 1304 reads the identification number Sr from the header of the baseband signal, and establishes frame synchronization using the identification number Sr. Details of this step will be described later. The channel decoder 1305, having received the signal indicating that the frame synchronization has been established, separates the frame of the baseband signal, performs error correction processing, and sends out bit data.

[0008] The terminal adapter 1306 performs audio processing or data processing on the input bit data. or,
The terminal adapter 1306 transmits, for example, ADPCM (Adaptive), which is a speech encoding method used in PHS, to speech or data to be transmitted.
Differential Pulse CodeMo
encoding).

A channel encoder 1307 performs an error correction code adding process and a frame assembling process on the encoded transmission data. The framed transmission signal is
Modulation processing for wireless transmission is performed by modulator 1308, and transmitted from antenna 1301 via duplexer 1302.

Next, the configuration and operation of the synchronization processing unit 1304 will be described with reference to FIGS.

In FIG. 14, an Sr _NEW acquisition unit 1401
Obtains the identification number Sr from the header of the baseband signal output from the demodulator 1303. Hereinafter, the newly acquired identification number Sr is particularly called Sr _NEW .

The switch 1402 is used for the Sr _NEW acquisition unit 14
01 is selectively output to a comparator 1403 described later or an Sr _CT counter 1404 and a comparator 1406 described later. The initial state is output to the comparator 1403, and the output destination is switched by a control signal described later.

[0013] The comparator 1403 determines whether or not the value of the input Sr _NEW is 0. Sr _CT counter 140
Reference numeral 4 denotes a sequential counter which generates a comparison value Sr _CT used to determine whether or not the identification number Sr _NEW extracted from the received signal has an error.
The count is incremented by a signal input from the Sr _NEW acquisition unit 1401 via the input unit 02, and is reset by the outputs of the comparator 1403 and a comparator 1405 described later.

The comparator 1405 determines whether Sr_CTCounter 140
Sr which is the output of 4_CTDetermines if the value of is 8
You. Sr_CTIf $ 8, comparator 1405 is input
Sr_CTIs output as it is to a comparator 1406 described later.
You. Sr_CT= 8, Sr _CTReset counter 1404
set.

The comparator 1406 calculates the value of Sr _{NEW and} the value of Sr _CT
It is determined whether or not the values are the same. Sr _NEW = Sr _CT
If so, the TNR counter 1407 described later is counted up, and if Sr _NEW ≠ Sr _CT , the Sr _NEW acquisition unit 140 acquires Sr _NEW from the next received frame.
Instruct 1

The TNR counter 1407 includes a comparator 140
6 is a counter that generates a TNR which is a value that is incremented each time Sr _NEW = Sr _CT is confirmed. The comparator 1408 determines whether or not the value of TNR has reached a value NR of a predetermined number of protection stages minus one. If TNR = NR, the backward protection processing ends, and T
If NR ≠ NR, it instructs the Sr _NEW acquisition unit 1401 to acquire Sr _{NEW of the} next frame.

Next, the operation of the synchronization processing unit 1304 will be described with reference to the flowchart of FIG.

Step (hereinafter referred to as ST) 1501
Sr_NEWSr by the acquisition unit 1401_NEWGet
Is done. Acquired Sr_NEWIn the comparator 1403
It is determined whether it is 0. Sr_NEWIf ≠ 0,
Sr_NEW= 0, that is, the unit of reception processing
Sr located at the beginning of one frame group (Sr = 0 to 7)
_NEW= 0 (hereinafter, simply referred to as "the first frame")
Sr) until it receives_NEWBy the acquisition unit 1401
Sr_NEWAcquisition (ST1501 to ST1502) is repeated
Is done.

When Sr _NEW = 0 is detected and it is confirmed that the first frame of one frame group as a unit of reception processing has been received, in ST1503, the Sr _CT counter 1
404 and TNR counter 1407 are reset and S
r _CT = 0 and TNR = 0 are set.

Next, in ST1504, the next Sr
_NEWIs obtained, and the control signal from the comparator 1403 is
Therefore, the switch 1402 is switched and the acquired
Sr _NEWIs input to the comparator 1406, and the control signal
Therefore Sr_CTCount up the counter 1404
You.

Next, in ST1506, it is determined whether or not Sr _CT after counting up is 8. Sr
_Since Sr _NEW , which is a _CT comparison control, is a value ranging from 0 to 7 here, the value of Sr _CT is also counted up, and when it reaches 8, the value is returned to 0 in ST1507.

Next, in ST1508, the comparator 1
Step 406 determines whether or not the value of Sr _NEW matches the value of Sr _CT . If they do not match, it is determined that an error has occurred, the data received so far is discarded, and S
The rearward protection processing is performed from T1501. If the value of Sr _{NEW and} the value of Sr _CT match, in ST1509, T
The NR counter 1407 is counted up.

Next, in ST1510, the comparator 1
Step 408 determines whether the TNR value matches the NR value. If they match, it is determined that the number of protection stages has reached the predetermined number.
05, the synchronization establishment signal is transmitted, and the backward protection processing ends. If they do not match, it is determined that does not reach the predetermined protection stage returns to ST1504, performs the processing for the next Sr _NEW.

As described above, the conventional synchronization processing unit uses the identification number Sr stored in the header of the frame to confirm that the number of frames that can be received without error reaches the predetermined number of protection stages. By doing so, frame synchronization is achieved.

[0025]

However, the conventional receiving apparatus has a problem that it takes time to establish frame synchronization.

Hereinafter, referring to the schematic diagrams of FIGS. 16 and 17, a case where the preset number of protection stages is smaller than a predetermined number of frames (here, 8) of one frame group which is a processing unit at the time of the interleave process is described. Divided into large cases,
This will be described in detail.

FIG. 16 is a schematic diagram showing a conventional backward protection process when the number of protection stages is smaller than eight.
FIG. 17 is a schematic diagram showing a conventional backward protection process when the number of protection stages is eight or more.

First, a case where the number of protection stages is smaller than 8, that is, a case where NR <7 will be described with reference to FIG. Here, for example, it is assumed that the number of protection stages is 4 (NR = 3).

Since the first frame and subsequent frames are valid frames as received data due to the reception processing such as the deinterleave processing, the backward protection processing is started from "reception start" in the figure until the first first frame is received. This is a standby state, and the rear protection process is started from the time point of “start of the rear protection process” illustrated.

In FIGS. 16A and 16B, Sr
Monitors _NEW = 0, receives the Sr _NEW = 0, Sr _CT counter 1404 is reset, Sr _CT = 0 is set. Thereafter, each time one frame is received, Sr _CT is incremented by one and compared with Sr _NEW .

FIG. 16A shows that the backward protection process is started from the first frame as shown in the figure, and Sr _NEW = Sr _CT matches without error until TNR = 3.
This shows a case where synchronization is established when NR = 3. In this case, the valid frames are the first and subsequent frames after the start of the backward protection processing, as shown in FIG.

On the other hand, FIG. 16B shows a case where an error occurs at the third frame from the start of the backward protection processing, that is, at the time of TNR = 2. Here, a case where one frame is dropped and received is shown. Where Sr _NEW = 2 should be received according to the count up of Sr _{CT
Since NEW} = 3 has been received, it is determined to be an error.

In view of the fact that the succeeding frames become valid frames after the first frame, when an error is detected, the backward protection processing is in a standby state until the next first frame (at the point of "restart" in the figure). Hereinafter, smoothly as in the case of FIG. 16 (a) Sr _NEW
When Sr _CT matches, synchronization is established at the time of “synchronization establishment” in the figure. In this case, the valid frames are the first and subsequent frames at the time when the backward protection processing is restarted, as shown in the figure.

Next, a case where the number of protection stages is eight or more, that is, a case where NR ≧ 7 will be described with reference to FIG.
Here, for example, it is assumed that the number of protection stages is 11 (NR = 10). Also in the case of FIG. 17, similarly to the case of FIG. 16, the back protection processing is performed after waiting until the first frame is received first.

FIG. 17A shows, similarly to the case of FIG. 16A, Sr _NEW and Sr _CT continuously from the start of the backward protection processing.
Are matched, and synchronization is established when TNR = 10 first. In this case, as shown in the figure, the valid frames are the first and subsequent frames of one frame group to which the frame at the time when synchronization is established.

On the other hand, FIG. 17B shows a case where an error occurs at the third frame from the start of the backward protection processing, that is, at the time of TNR = 2, as in the case of FIG. 16B. Here, a case where one frame is dropped and received is shown. In this case, as in the case of FIG. 16B, the backward protection processing is in a standby state until the next head frame (at the time of “restart” in the figure) is received.

As described above, the start of the backward protection processing is suspended until the first frame is received, and even if an error occurs during the backward protection processing, the backward protection processing is not restarted until the first frame is received. Is a cause of prolonging the time required for establishing synchronization, especially when NR ≧ 7.

The long time required to establish synchronization is as follows.
This means that the number of useless frames that are not used as received data despite being received increases, which causes a reduction in transmission efficiency.

The present invention has been made in view of the above, and an object of the present invention is to provide a receiving apparatus that reduces the time required for establishing synchronization by backward protection processing.

[0040]

The gist of the present invention is as follows. In the backward protection processing, when the number of protection steps is equal to or larger than a predetermined number of frames to be collectively processed in the interleave processing, the backward protection processing is started simultaneously with the start of reception. However, when an error is detected during the processing, the time required for the synchronization processing is reduced by restarting the backward protection processing from the frame received immediately after the error detection.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A receiving apparatus according to a first aspect of the present invention comprises a radio receiving means for receiving a radio signal composed of a plurality of frames subjected to an interleaving process, and an identification number assigned to each frame of the radio signal. ID number acquiring means for acquiring, the counting means for increasing the value held at the same amount as the increase number of the identification number for each frame reception, and the same value as the first acquired identification number after the start of synchronization establishment processing A configuration comprising: an initial value setting unit that sets the counting unit as an initial value; and a rear protection processing unit that compares an identification number obtained every frame reception with a value of the counting unit and performs a rear protection process. Take.

According to this configuration, since the backward protection processing is performed by checking the continuity from an arbitrary identification number without waiting for the first frame, the time required for establishing synchronization can be reduced.

[0043] In the receiving apparatus according to a second aspect of the present invention, in the first aspect, the identification number is equal to the number of consecutive frames provided as a predetermined number of frames, which is a processing unit of interleaving processing performed for each of a plurality of frames. This is a group of integers that are stored in a frame while circulating one value at a time.

According to this configuration, since the identification number is an integer, counting by the counting means becomes easy.
Since the same number of identification numbers as the predetermined number of frames, which are processing units of the interleave processing, are provided continuously and in a circulating manner, it is possible to easily detect a plurality of frames that are processing units in the deinterleave processing.

[0045] The receiving apparatus according to a third aspect of the present invention, in the second aspect, is characterized in that, immediately after the start of communication, the first size is compared with the predetermined number of frames and the number of backward protection stages in the backward protection processing means. A judging unit, and when the number of rear protection stages is smaller than the predetermined number, first synchronization processing start timing control for suspending initial value setting to the counting unit by the initial value setting unit until a minimum value of the identification number is obtained. And a configuration having a part.

According to this configuration, when the set protection stage number is equal to or more than the predetermined frame number (for example, 8), the continuity is checked by checking the identification number of the first received frame without waiting for the first frame. Since the protection processing is performed, the time required for establishing synchronization can be reduced when the number of protection stages is eight or more.

In the receiving apparatus according to the fourth aspect of the present invention, in the second aspect or the third aspect, if an error occurs during the backward protection processing, the predetermined number and the backward protection processing means are provided. A second magnitude judging unit for comparing the number of protection stages with the number of stages, and setting an initial value to the counting unit by the initial value setting unit until the minimum value of the identification number is obtained if the number of rear protection stages is smaller than the predetermined number. And a second synchronous processing start timing control unit for suspending the process.

According to this configuration, when the number of protection steps set is less than the predetermined number of frames (for example, 8), when an error occurs during the backward protection processing, the backward protection processing is restarted after waiting for the first frame. To prevent data loss when synchronization is established,
When the set number of protection stages is eight or more, the time required for establishing synchronization can be reduced.

[0049] A communication terminal apparatus according to a fifth aspect of the present invention employs a configuration including the receiver according to any one of the first to fourth aspects.

According to this configuration, the time required for establishing synchronization can be reduced by the backward protection processing.

[0051] The base station apparatus according to the sixth aspect of the present invention comprises:
A configuration for performing wireless communication with the communication terminal device according to the fifth aspect is employed.

According to this configuration, the time required for establishing synchronization can be reduced by the backward protection processing.

[0053] The base station apparatus according to the seventh aspect of the present invention comprises:
A configuration including the receiving device according to any one of the first to fourth aspects is employed.

According to this configuration, the time required for establishing synchronization can be reduced by the backward protection processing.

[0055] A backward protection processing method according to an eighth aspect of the present invention includes a wireless reception step of receiving a wireless signal composed of a plurality of frames subjected to interleaving processing, and acquiring an identification number given to each frame of the wireless signal. An identification number acquiring step, a counting step of increasing a value held at the same amount as the increment of the identification number every frame reception, and counting the same value as the identification number acquired first after the start of synchronization establishment processing. An initial value setting step of setting an initial value in the step, and a rear protection processing step of comparing the identification number acquired every frame reception with the value of the counting step and performing a rear protection process. .

According to this method, the backward protection processing is performed by checking the continuity from an arbitrary identification number without waiting for the first frame, so that the time required for establishing synchronization can be reduced.

In the rearward protection processing method according to a ninth aspect of the present invention, in the eighth aspect, immediately after the start of communication, a predetermined number of frames, which is a processing unit of an interleaving process performed for each of a plurality of frames, and To a first magnitude determination step of comparing the number of rear protection steps in the processing step with the number of steps, and to the counting step by the initial value setting step until the minimum value of the identification number is obtained if the number of the rear protection steps is smaller than the predetermined number. And a first synchronous processing start timing control step of suspending the setting of the initial value.

According to this method, when the number of protection steps set is equal to or more than the predetermined number of frames (for example, eight), the continuity is checked by checking the identification number of the first received frame without waiting for the first frame. Since the protection processing is performed, the time required for establishing synchronization can be reduced when the number of protection stages is eight or more.

[0059] The backward protection processing method according to the tenth aspect of the present invention is the method of the eighth or ninth aspect, wherein an error occurs during the backward protection processing. A second magnitude determination step of comparing the size of a predetermined number of frames as a processing unit with the number of rear protection steps in the rear protection processing step, and obtaining a minimum value of the identification number when the number of rear protection steps is smaller than the predetermined number; A second synchronization processing start timing control step of suspending the setting of the initial value in the counting step by the initial value setting step.

According to this method, when the set number of protection steps is less than the predetermined number of frames (for example, 8), when an error occurs during the backward protection processing, the backward protection processing is restarted after waiting for the first frame. To prevent data loss when synchronization is established,
When the set number of protection stages is eight or more, the time required for establishing synchronization can be reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1) The receiving apparatus according to the present embodiment is provided with an initial value setting section so that the backward protection processing can be started from an arbitrary identification number Sr, and an error occurs during the backward protection processing. Sr _NEW without waiting for the first frame
Then, the rear protection process is restarted from the time when = Sr _CT .

Hereinafter, the receiving apparatus according to the present embodiment will be described with reference to FIGS. FIG. 1 is a main block diagram illustrating a schematic configuration of a receiving apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a schematic configuration of a synchronization processing section of the receiving apparatus according to Embodiment 1 of the present invention. FIG. 3 is a flowchart showing the operation of the synchronization processing unit of the receiving apparatus according to Embodiment 1 of the present invention.

In FIG. 1, antenna 101 transmits and receives radio signals, duplexer 102 switches input and output of transmission and reception signals, and demodulator 103 performs demodulation processing on the received signals and outputs baseband signals. I do.

The synchronization processing section 104 reads out the identification number Sr from the header of the baseband signal, and
To perform the backward protection processing to establish frame synchronization. The initial value setting unit 105 arbitrarily sets the initial value of the counter in the synchronization processing unit 104 so that, when an error occurs during the backward protection processing in the synchronization processing unit 104, the synchronization processing can be started again from the immediately following received frame. Set to the value of. The details of the synchronization processing unit 104 and the initial value setting unit 105 will be described later.

The channel decoder 106 has the synchronization processing unit 1
The baseband signal frame is separated based on the synchronization establishment signal which is the output of 04, error correction processing is performed, and bit data is transmitted.

The terminal adapter 107 performs audio processing or data processing on the input bit data. Further, the terminal adapter 107 performs an encoding process, for example, an audio encoding system ADPCM used in the PHS, on audio or data to be transmitted.

The channel encoder 108 performs an error correction code adding process and a frame assembling process on the encoded transmission data. The modulator 109 performs a modulation process on the transmission signal having the frame configuration.

Next, the operation of the receiving apparatus according to the present embodiment having the above configuration will be described.

At the time of signal reception, the radio signal is received by the antenna 101, input to the demodulator 103 via the duplexer 102, and demodulated by the demodulator 103 to obtain a baseband signal.

The baseband signal of the received signal is input to synchronization processing section 104 and channel decoder 106. The synchronization processing section 104 performs frame synchronization on the baseband signal. The received signal is separated into frames by the channel decoder 106 that has received the signal indicating that the frame synchronization has been established, subjected to error correction processing, and becomes bit data. The bit data of the obtained reception signal is
Voice processing or data processing is performed by the terminal adapter 107.

At the time of signal transmission, the transmission data is encoded by the terminal adapter 107, subjected to error correction code addition processing and frame assembling processing by the channel encoder 108, modulated by the modulator 109, and transmitted to the duplexer 102. The signal is transmitted from the antenna 101 via the antenna 101.

Next, the configurations and operations of the synchronization processing section 104 and the initial value setting section 105 will be described in detail with reference to FIGS.

In FIG. 2, the Sr _NEW acquisition unit 201
Acquiring identification number Sr _NEW from the header of the baseband signal output from the demodulator 103. The switch 202
r The output signal of the _NEW acquisition unit 201 is compared with a comparator 20 described later.
3, or Sr _CT counter 204 and comparator 20 described later
6 and selectively output to any one of. The initial state is output to the comparator 203, and the output destination is switched by a control signal described later.

The comparator 203 determines whether or not the value of the input Sr _NEW is 0. Sr _{C T} counter 204
Is a sequential counter that generates a comparison value Sr _CT used to determine whether or not the identification number Sr _NEW extracted from the received signal has an error.
The count is incremented by a signal from the Sr _NEW acquisition unit 201 input through the, and is reset by the outputs of the comparator 203 and a comparator 205 described later, and an arbitrary value is set by the initial value setting unit 105.

The comparator 205 determines whether or not the value of Sr _CT output from the Sr _CT counter 204 is 8. S
If r _CT ≠ 8, the comparator 205 outputs the input value of Sr _CT to a comparator 206 described later as it is. Sr _CT
If = 8, the Sr _CT counter 204 is reset.

The comparator 206 determines whether or not the value of Sr _{NEW and} the value of Sr _CT are the same. If Sr _NEW = Sr _CT , the TNR counter 207 described later is counted up. If Sr _NEW ≠ Sr _CT , the TNR counter 207 described later is reset.
It instructs the Sr _CT counter 204 to be set so that _CT = Sr _NEW, and instructs the Sr _NEW acquisition unit 201 to acquire Sr _NEW from the next frame.

The TNR counter 207 is a counter that generates a value that is incremented each time Sr _NEW = Sr _CT is confirmed by the comparator 206, that is, the number of times that Sr _NEW matches Sr _CT , that is, TNR. The comparator 208 determines that the value of TNR is equal to the number of protection stages NR provided in advance.
Is determined. If TNR = NR, terminates the frame synchronization process, if TNR ≠ NR, instructs the Sr _NEW acquisition unit 201 to acquire the Sr _{NE W} of the next frame.

Next, the operations of the synchronization processing section 104 and the initial value setting section 105 of the receiving apparatus according to the present embodiment will be described using the flowchart of FIG.

In ST301, Sr _NEW acquisition section 20
1 obtains Sr _NEW . The comparator 203 determines whether the acquired Sr _NEW is 0 or not. S
If r _NEW ≠ 0, until Sr _NEW = 0, i.e. Sr _NEW acquired by the first frame in the Sr _NEW acquiring unit 201 until receiving the reception processing unit and comprising one frame group (Sr = 0~7) (ST301 To ST302) are repeated.

When Sr _NEW = 0 is detected and it is confirmed that the first frame of one frame group as a reception processing unit has been received, in ST303, the Sr _CT counter 20
4 and the TNR counter 207 are reset, and Sr _CT =
0 and TNR = 0 are set.

Next, in ST304, the next Sr
_NEW is acquired, and the switch 202 is switched by the control signal from the comparator 203 to acquire the acquired Sr.
_NEW is input to the comparator 206. In ST305, the control signal causes the Sr _CT counter 204 to count up.

Next, in ST306, it is determined whether or not Sr _CT after counting up is 8. Sr _CT
Since Sr _NEW is a value that takes a value from 0 to 7 in this case, the value of Sr _CT is also counted up, and when it reaches 8, the value is returned to 0 in ST307.

Next, in ST308, the comparator 20
6 determines whether values of the Sr _CT of Sr _NEW match.

[0085] If there is no match, it is determined that an error has occurred, returning the TNR is reset to zero TNR counter 207, the Sr _CT counter 204 to an initial value setting unit 105 S
command to set r _CT = Sr _NEW , and ST3
Returning to 04, the backward protection processing is immediately restarted from the next frame. If the value of Sr _NEW matches the value of Sr _CT , S
At T310, the TNR counter 207 is counted up.

Next, in ST311, the comparator 20
8 determines whether the value of TNR matches the value of NR. If they match, it is determined that the number of times that Sr _CT = Sr _NEW has reached the predetermined number of protection stages, and a synchronization establishment signal is transmitted from the synchronization processing unit 104 to the channel decoder 106,
The backward protection processing ends. If they do not match, it is determined that does not reach the predetermined protection stage returns to ST 304, continuing the acquisition process the next Sr _NEW.

Next, with reference to FIG. 4 and FIG. 5, the form of the rearward protection processing according to the present embodiment will be described. FIG.
FIG. 5 is a schematic diagram showing a mode of the rearward protection processing according to Embodiment 1 of the present invention when the number of protection steps is smaller than 8, and FIG. 5 is a diagram illustrating Embodiment 1 of the present invention when the number of protection steps is 8 or more. It is a schematic diagram which shows the aspect of the rear protection process concerning.

First, a case where the number of protection stages is smaller than 8, that is, a case where NR <7 will be described with reference to FIG. Here, for example, it is assumed that the number of protection stages is 4 (NR = 3).

As shown in FIG. 4A, as shown in the figure, the backward protection processing is started from the first frame, and Sr _NEW = Sr _CT matches without error until TNR = 3.
This shows a case where synchronization is established when NR = 3. In this case, the valid frames are the first and subsequent frames after the start of the backward protection processing, as shown in FIG.

On the other hand, FIG. 4B shows a case where an error has occurred at the third frame from the start of the backward protection processing, that is, at the time of TNR = 2. Here, a case where one frame is dropped and received is shown. Sr _NEW Where should receive the Sr _NEW = 2 to count up as of Sr _CT
= 3, it is determined to be erroneous.

When an error is detected, the backward protection process is immediately restarted, so that the initial value setting unit 105 sets the value of Sr _NEW in Sr _CT as shown in ST309 of FIG. In addition, the TNR counter 207 is reset in preparation for starting the rearward protection processing.

The preparation for the start of the rearward protection processing is made later.
Sr at the start of_NEW= 0 when Sr is received_CTMosquito
Reset the counter 204 and Sr_CTTo set = 0
Is different and the obtained Sr_NEWBased on Sr_NEWContinuous
To determine the nature of Sr _NEWWithout waiting for = 0
The protection process can be restarted.

Then, the backward protection processing for the next frame as shown in ST304 to ST308 in FIG. 3 is performed. FIG. 4B shows a case where an error of missing one frame occurs in the next frame, and Sr _CT is 4, but acquired Sr _NEW is 5. Thus, during the backward protection processing resumed, without waiting for Sr _NEW = 0, to investigate the continuity of Sr _NEW based on the obtained Sr _NEW, there is a case where an error even TNR = 0 occurs. Therefore,
The setting shown in ST309 of FIG. 3 is performed again, and ST304 to ST308 of FIG. 3 are performed again.

In FIG. 4B, in the next frame,
Sr _NEW = Sr _CT = 6 and turned by sr _{N EW} and Sr _CT match, shows a case where backward protection processing is resumed. Thereafter, when the reception is performed without error, the synchronization is established when TNR = 3.

FIG. 4 (b) is compared with FIG. 16 (b) showing a processing method in a conventional receiving apparatus when an error occurs at NR = 3 and also at TNR = 2 after the start of the backward protection processing. It can be seen that the synchronization is established two frames earlier in the receiving apparatus according to the present embodiment.

Next, a case where the number of protection stages is 8 or more, that is, a case where NR ≧ 7 will be described with reference to FIG. Here, for example, it is assumed that the number of protection stages is 11 (NR = 10).

FIG. 5 (a) shows the case where Sr _NEW and Sr _CT match continuously from the start of the backward protection processing and synchronization is established when TNR = 10 first, as in the case of FIG. 4 (a). It shows the case where it is done. In this case, as shown in the figure, the valid frames are the first and subsequent frames of a frame group to which the frame at the time when the synchronization is established.

On the other hand, FIG. 5B shows a case where an error occurs at the third frame from the start of the backward protection processing, that is, at the time of TNR = 2, as in the case of FIG. 4B.
Here, a case where one frame is dropped and received is shown. In this case, as in the case of FIG. 4 (b), the value of Sr _NEW in Sr _CT by the initial value setting unit 105 is set, TNR counter 207 is reset, Sr _NEW
= 0 without waiting for Sr _NEW based on the acquired Sr _NEW
Examine the continuity of

In FIG. 5B, in successive frames,
Sr _NEW = Sr _CT = 6 and turned by sr _{N EW} and Sr _CT match, shows a case where backward protection processing is resumed. Thereafter, if the reception is performed without error, the synchronization is established when TNR = 10 (not shown).

FIG. 5B shows a processing method in a conventional receiving apparatus when an error occurs at NR = 10 and at TNR = 2 after the start of the backward protection processing.
It can be seen that the synchronization is established earlier in the receiving apparatus according to the present embodiment as compared with.

The case of FIG. 5B is the same as that of FIG.
Since the frame from a temporally earlier stage can be used as an effective frame as compared with the case (b), the number of useless frames which are received but not used as received data can be reduced.

As described above, according to the present embodiment, in the backward protection processing in the receiving apparatus, the backward protection processing is performed by checking the continuity from an arbitrary identification number without waiting for the first frame. The required time can be reduced.

When the number of protection stages is eight or more, the number of unnecessary frames that are received but not used as received data can be reduced.

(Embodiment 2) The receiving apparatus according to the present embodiment has the same configuration as that of Embodiment 1, except that when the number of protection stages is eight or more, the receiving apparatus does not wait for the first frame at the start of communication. This is to start the backward protection processing.

Hereinafter, the receiving apparatus according to the present embodiment will be described using FIG. 6 and FIG. FIG. 6 is a main block diagram showing a schematic configuration of a synchronization processing section of the receiving apparatus according to Embodiment 2 of the present invention, and FIG. 7 is a synchronization processing section of the receiving apparatus according to Embodiment 2 of the present invention. It is a flowchart which shows operation | movement. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 6, the protection stage number determination unit 601
When the baseband signal is input to the synchronization processing unit 104,
In accordance with the set number of protection stages, each unit is instructed to process the input baseband signal.

When the number of protection steps is less than 8 (NR <7), the protection step number determination unit 601 instructs the Sr _NEW acquisition unit 201 to perform the same processing as in the first embodiment, and the protection step number is 8 or more. In the case of (NR ≧ 7), the Sr _NEW acquiring unit 201, the switch 202, and the T are configured to check the continuity of Sr _NEW based on the acquired Sr _NEW without waiting for Sr _NEW = 0.
It instructs the NR counter 207 and the initial value setting unit 105.

Next, the operations of the synchronization processing section 104 and the initial value setting section 105 of the receiving apparatus according to the present embodiment will be described using the flowchart of FIG.

First, in ST 701, protection stage number determination section 601 determines whether or not NR is less than 7. If NR <7, the same processing as in the first embodiment is performed in ST702 to ST704.

In ST701, if NR ≧ 7,
Proceeding to ST705, the Sr _NEW acquiring section 201 receives one frame and acquires Sr _NEW . Next, in ST706, protection stage number determination section 601 causes TNR counter 2
07 is reset, and Sr _CT = Sr _NEW is set in the Sr _CT counter 204 by the initial value setting unit 105 receiving an instruction from the protection stage number determination unit 601.

Hereinafter, ST70, which is the step of the rearward protection processing, will be described.
Steps 7 to ST714 are the same as those in the first embodiment, and a description thereof will not be repeated.

Next, the form of the rearward protection processing according to the present embodiment will be described with reference to FIG. FIG. 8 is a schematic diagram illustrating a mode of the rearward protection processing according to the second embodiment of the present invention when the number of protection steps is eight or more. Note that when the number of protection stages is less than 8, it is the same as the first embodiment and the same as the embodiment shown in FIG.

Referring to FIG. 8, when the number of protection stages is eight or more,
That is, the case where NR ≧ 7 will be described. here,
For example, it is assumed that the number of protection stages is 11 (NR = 10).

FIG. 8 (a) shows that the value of Sr _NEW of the first received frame is set to Sr _CT and TN
The R counter 207 is reset, the backward protection processing is started from the first received frame, and Sr _NEW = Sr _CT matches without error until TNR = 10, and first TNR = N
This shows a case where synchronization is established when R = 10. In this case, the valid frames are the first and subsequent frames received as shown in the figure.

On the other hand, FIG. 8B shows a case where an error has occurred in the second frame from the start of the backward protection processing, that is, at the time of TNR = 1. Here, a case where one frame is dropped and received is shown. Sr _NEW Where should receive the Sr _NEW = 5 to count up as of Sr _CT
= 6, it is determined to be erroneous.

When an error is detected, the continuity of Sr _NEW is checked based on the acquired Sr _NEW without waiting for Sr _NEW = 0, as in the first embodiment.

FIG. 8B shows a processing method in the receiving apparatus according to the first embodiment when an error occurs at TNR = 2 after the start of the backward protection processing also at NR = 10. ), It can be seen that synchronization is established earlier in the receiving apparatus according to the present embodiment.

The case of FIG. 8B is the same as that of FIG.
Since a frame from a temporally earlier stage can be used as an effective frame as compared with the case of, it is possible to reduce the number of unnecessary frames that are received but are not used as received data.

As described above, according to the present embodiment, when the number of protection steps is eight or more, by checking the continuity from the identification number of the first received frame at the start of communication without waiting for the first frame. Since the protection processing is performed, the time required for establishing synchronization can be reduced when the number of protection stages is eight or more.

When the number of protection stages is eight or more, the number of unnecessary frames that are received but not used as received data can be reduced.

(Embodiment 3) The receiving apparatus according to the present embodiment has the same configuration as that of Embodiment 1, except that if the number of protection stages is less than 8, an error occurs during the backward protection processing. In this case, the backward protection process is restarted after waiting for the first frame.

In the first embodiment, an error occurs during the backward protection processing, and Sr _NEW = Sr _CT without waiting for Sr _NEW = 0.
When the rearward protection processing is resumed from the point in time when NR <7
In the case of, even if synchronization is established, one frame group (Sr = 0 to
There is a possibility that data is lost during 7), and in this case, the effective frame is after the next head frame.

Therefore, in the present embodiment, only when NR <7, when an error occurs during the backward protection processing, the backward protection processing is restarted after waiting for the first frame.

Hereinafter, the receiving apparatus according to the present embodiment will be described using FIG. 9 and FIG. FIG. 9 is a main block diagram showing a schematic configuration of a synchronization processing unit of the receiving apparatus according to Embodiment 3 of the present invention, and FIG. 10 is a synchronization processing unit of the receiving apparatus according to Embodiment 3 of the present invention. It is a flowchart which shows operation | movement. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 9, the protection stage number determination unit 901
During the backward protection processing, the comparison result in the comparator 206 is S
When r _NEW ≠ Sr _CT , the number of protection steps is less than 8 (NR
In the case of <7), the rear protection process is restarted after waiting for Sr _NEW = 0, and the number of protection stages is 8 or more (NR ≧
For 7), as in the first embodiment, Sr _NEW = 0 to not wait, Sr _{NE W} acquiring unit 201 so as to investigate the continuity of Sr _NEW based on the obtained Sr _NEW, switch 20
2. Instruct the TNR counter 207 and the initial value setting unit 105.

Next, the operations of the synchronization processing section 104 and the initial value setting section 105 of the receiving apparatus according to the present embodiment will be described using the flowchart of FIG.

ST1001 to ST1008 are executed in the form of an embodiment.
The description is omitted because it is the same as in the first embodiment. Rear protection processing
If an error occurs during operation, that is, in ST1008
Sr _NEW≠ Sr_CTIf it becomes, ST1009
To determine whether the NR is less than 7 by the protection stage number determination unit 901.
Is determined.

If NR ≧ 7 in ST1009, the process proceeds to ST1010, and the same processing as in the first embodiment is performed. On the other hand, in ST1009, NR <7
If, the process proceeds to ST 1011, whether the current Sr _NEW is 0 or not is determined. If Sr _NEW = 0, ST100
3, the backward protection processing is resumed immediately and Sr
If the _NEW ≠ 0, to monitor the Sr _NEW = 0 back to ST1001, backward protection processing is resumed from waiting for the top frame to be Sr _NEW = 0.

Steps ST1012 to ST1013 are the same as in the first embodiment, and a description thereof will not be repeated.

In this embodiment, when the number of protection stages is eight or more, the operation is the same as that of the first embodiment, and is the same as the embodiment shown in FIG. 5, and when the number of protection stages is less than eight, Since this is the same as the conventional rear protection process and is the same as the mode shown in FIG. 16, the schematic diagram and the description of the mode of the rear protection process according to the present embodiment are omitted.

As described above, according to the present embodiment, only when the number of protection steps is less than 8, when an error occurs during the backward protection processing, the backward protection processing is restarted after waiting for the first frame. Therefore, it is possible to prevent data loss at the time of establishing synchronization when the number of protection stages is less than 8, while maintaining the effect of shortening the time required for establishing synchronization when the number of protection stages is 8 or more.

(Embodiment 4) The receiving apparatus according to the present embodiment has the same configuration as that of Embodiment 1, except that when the number of protection stages is 8 or more, the receiving apparatus does not always wait for the first frame and When the protection process is started or restarted and the number of protection steps is less than 8, the backward protection process is started or restarted after always waiting for the first frame.

In the present embodiment, the effects of the second embodiment and the effects of the third embodiment with respect to the first embodiment are simultaneously realized. That is, when the number of protection steps is eight or more, the backward protection processing is started without waiting for the first frame at the start of communication, and when the number of protection steps is less than eight, when an error occurs during the backward protection processing, the first frame is started. After that, the backward protection process is restarted.

Hereinafter, the receiving apparatus according to the present embodiment will be described using FIG. 11 and FIG. FIG. 11 is a main block diagram showing a schematic configuration of a synchronization processing section of the receiving apparatus according to Embodiment 4 of the present invention, and FIG. 12 is a synchronization processing section of the receiving apparatus according to Embodiment 4 of the present invention. It is a flowchart which shows operation | movement. Note that Embodiments 1 to 3
The same components as those described above are denoted by the same reference numerals, and detailed description thereof is omitted.

Referring to FIG. 11, synchronization processing section 104 according to the present embodiment has protection stage number determination section 601 and protection stage number determination section 901. When the number of protection steps is eight or more, the protection step number determination unit 601 starts the backward protection processing without waiting for the first frame at the start of communication, and the protection step number determination unit 901 performs the processing when the number of protection steps is less than eight. When an error occurs during the backward protection process, the backward protection process is restarted after waiting for the first frame.

Next, referring to FIG. 12, synchronization processing section 104 and initial value setting section 10 of the receiving apparatus according to the present embodiment will be described.
Operation 5 will be described.

First, in ST1201, the number of protection steps is determined by the protection step number determination unit 601. If the number of protection steps is less than 8, the backward protection processing is started after waiting for the first frame in ST1202 to ST1204. If the number of stages is 8 or more, ST1205 to ST1206
, Without waiting for the first frame,
backward protection processing is started from r _NEW.

Steps ST1207 to ST1211 are the same as those in the first embodiment and will not be described. In ST1212, the protection stage number determination unit 901 determines the number of protection stages. If the number of protection stages is 8 or more, the process proceeds to ST1213.
Without waiting for the first frame, then started backward protection processing is again from Sr _NEW acquired, if protection stage is less than 8,
Proceeding to ST1214, after waiting for the first frame, the backward protection processing is restarted.

Steps ST1215 to ST1216 are the same as those in the first embodiment, and a description thereof will not be repeated.

In this embodiment, when the number of protection steps is eight or more, the operation is the same as that of the second embodiment, and is the same as the embodiment shown in FIG. 8, and when the number of protection steps is less than eight, Since this is the same as the conventional rear protection process and is the same as the mode shown in FIG. 16, the schematic diagram and the description of the mode of the rear protection process according to the present embodiment are omitted.

As described above, according to the present embodiment, when the number of protection steps is eight or more, the backward protection processing is started or restarted without always waiting for the first frame. Can be shortened. Further, it is possible to reduce the number of useless frames that are received but are not used as received data.

When the number of protection stages is less than 8, since the backward protection process is always started or restarted after waiting for the first frame, it is possible to prevent data loss when synchronization is established.

In the first to fourth embodiments, for example, it has been described that the interleaving process is performed every eight frames and the identification number Sr takes eight values from 0 to 7. The present invention is not limited to the above conditions, and the present invention can be applied to any frame used for one interleave process and any number of set identification numbers corresponding thereto.

The synchronization processing section in the first to fourth embodiments can be realized by using, for example, an LSI or a DSP.

[0145]

As described above, according to the present invention,
In the backward protection processing, if the number of protection stages is equal to or more than a predetermined number of frames to be collectively processed in the interleave processing, the identification number of the first received frame is set as an initial value, and the backward protection processing is started from that value. Therefore, the time required for the synchronization process can be reduced.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing a schematic configuration of a receiving apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a main block diagram showing a schematic configuration of a synchronization processing section of the receiving apparatus according to Embodiment 1 of the present invention.

FIG. 3 is a flowchart showing an operation of a synchronization processing unit of the receiving apparatus according to Embodiment 1 of the present invention.

FIG. 4 is a schematic diagram showing a mode of a rearward protection process according to the first embodiment of the present invention when the number of protection steps is smaller than eight.

FIG. 5 is a schematic diagram showing a mode of a rearward protection process according to the first embodiment of the present invention when the number of protection steps is eight or more.

FIG. 6 is a main block diagram showing a schematic configuration of a synchronization processing unit of the receiving apparatus according to Embodiment 2 of the present invention.

FIG. 7 is a flowchart showing the operation of the synchronization processing unit of the receiving apparatus according to Embodiment 2 of the present invention.

FIG. 8 is a schematic diagram showing a mode of a rearward protection process according to the second embodiment of the present invention when the number of protection steps is eight or more.

FIG. 9 is a main block diagram showing a schematic configuration of a synchronization processing unit of the receiving apparatus according to Embodiment 3 of the present invention.

FIG. 10 is a flowchart showing the operation of the synchronization processing unit of the receiving apparatus according to Embodiment 3 of the present invention.

FIG. 11 is a main block diagram showing a schematic configuration of a synchronization processing section of a receiving apparatus according to Embodiment 4 of the present invention.

FIG. 12 is a flowchart showing the operation of the synchronization processing unit of the receiving apparatus according to Embodiment 4 of the present invention.

FIG. 13 is a main block diagram showing a schematic configuration of a conventional receiving apparatus.

FIG. 14 is a main block diagram showing a schematic configuration of a synchronization processing unit of a conventional receiving apparatus.

FIG. 15 is a flowchart showing the operation of the synchronization processing unit of the conventional receiving apparatus.

FIG. 16 is a schematic diagram showing a state of a conventional synchronization process when the number of protection stages is less than eight.

FIG. 17 is a schematic diagram showing a state of a conventional synchronization process when the number of protection stages is eight or more.

[Explanation of symbols]

104 Synchronization processing unit 105 Initial value setting unit 201 Sr _NEW acquisition unit 204 Sr _CT counter 207 TNR counter 601 Protection stage number determination unit 901 Protection stage number determination unit

Claims (10)

[Claims] 1. A wireless receiving means for receiving a wireless signal composed of a plurality of frames subjected to interleaving processing, an identification number acquiring means for acquiring an identification number given to each frame of the wireless signal, and an increment of the identification number Counting means for increasing the value held at the same amount as each frame reception, and an initial value setting means for setting the same value as the first acquired identification number as an initial value to the counting means after the start of synchronization establishment processing, A receiving apparatus comprising: a backward protection processing unit that compares an identification number obtained every time one frame is received with a value of the counting unit and performs a backward protection process. 2. The identification number is a continuous integer group provided in the same number as a predetermined number of frames, which is a processing unit of interleave processing performed for each of a plurality of frames, and is stored one value per frame while circulating. The receiving device according to claim 1, wherein 3. A first magnitude judging unit for comparing the predetermined number of frames with the number of rear protection stages in the rear protection processing means immediately after the start of communication, and the first size judgment unit when the number of rear protection stages is smaller than the predetermined number. 3. The receiving apparatus according to claim 2, further comprising: a first synchronization processing start timing control unit that suspends setting of an initial value in the counting unit by the initial value setting unit until a minimum value of an identification number is obtained. . 4. When an error occurs during the backward protection processing,
A second magnitude determination unit that compares the predetermined number of frames with the number of rear protection steps in the rear protection processing unit, and, if the number of rear protection steps is smaller than the predetermined number, until the minimum value of the identification number is obtained. 4. The receiving apparatus according to claim 2, further comprising: a second synchronization processing start timing control unit that suspends the setting of the initial value in the counting unit by the initial value setting unit. 5. A communication terminal device comprising the receiving device according to claim 1. 6. A base station apparatus for performing wireless communication with the communication terminal apparatus according to claim 5. 7. A base station apparatus comprising the receiving apparatus according to claim 1. Description: 8. A radio receiving step of receiving a radio signal composed of a plurality of frames subjected to interleaving processing, an identification number obtaining step of obtaining an identification number given to each frame of the radio signal, and an increment of the identification number A counting step of increasing the value held at the same amount as each frame reception, and an initial value setting step of setting the same value as the first acquired identification number as an initial value in the counting step after the start of synchronization establishment processing, A rearward protection processing step of comparing an identification number obtained every time one frame is received with the value of the counting step and performing a rearward protection processing. 9. A first size determination step of comparing a predetermined number of frames, which is a processing unit of interleaving processing performed for each of a plurality of frames, with the number of rear protection stages in the rear protection processing step immediately after the start of communication; A first synchronous processing start timing control step of suspending the initial value setting in the counting step by the initial value setting step until the minimum value of the identification number is obtained when the number of backward protection stages is smaller than the predetermined number. 9. The rear protection processing method according to claim 8, wherein: 10. When the error occurs during the backward protection processing, a predetermined number of frames, which is a processing unit of the interleaving processing performed for each of a plurality of frames, is compared with the number of backward protection steps in the backward protection processing step. Two large / small judgment step and, when the number of the rear protection stages is smaller than the predetermined number, start of a second synchronization process for suspending the initial value setting to the counting step by the initial value setting step until the minimum value of the identification number is obtained. 10. The backward protection processing method according to claim 8, further comprising a timing control step.