JPH04132330A - Synchronization burst detector - Google Patents

Abstract

PURPOSE:To simplify the synchronization burst detection of other radio channel in an idle frame and to execute the detection of the synchronization burst with one timing controller by outputting a burst demodulated on the condition of the correlation detection between the demodulated burst and a synchronization sequence to a burst analyzer. CONSTITUTION:When a synchronization burst of other radio channel at least in an idle frame is detected and only when the correlation between a burst demodulated by a demodulator 2 and a synchronization sequence is detected, the burst demodulated by the demodulator 2 is outputted to a burst analyzer 3. Then the succeeding processing is implemented independently of the timing commanded by the reception timing controller 6. Thus, the master timing controller for detecting the synchronization burst in the idle frame is not required and the control of the timing controller in a control section 8 is not required.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to synchronization inserted into pre-assigned time slots in mobile communication using, for example, a radio time division multiplexing (hereinafter referred to as TDMA) communication method. The present invention relates to a synchronous burst detection device that detects bursts.

[Conventional technology]

FIG. 3 is a block diagram showing the configuration of a conventional synchronous burst detection device. In the figure, 1 is a receiver (hereinafter referred to as RX) that receives bursts on a wireless line, and 2 is the
1 is a demodulator (hereinafter referred to as DEMO) that demodulates the received burst using a predetermined demodulation method; 3 is the DEMO;
a burst analyzer (hereinafter referred to as BA) that extracts an information portion from the burst demodulated by MO2; 4 a channel decoder (hereinafter referred to as CH-DEC) that performs error control on the information portion extracted by BA3;
5 is a channel selector (hereinafter referred to as CH-8) that specifies the type of reception burst for the BA3 and CH-DEC4.
EL), 6 is the above-mentioned RX1, DEMO2, BA3
, CH-DEC4, and CH-8EL, a reception timing controller (hereinafter referred to as RX-TC) that controls the operation timing, I is a mask timing controller (hereinafter referred to as M-TC), 8 is the CH-DE
C4, CH-8EL5, RX-TC5.

and the operation control of M-TC7 and the error-controlled data (information part) output from the CH-DEC4,
Control unit that performs software control (hereinafter referred to as LCU)
It is.

FIG. 4 is a diagram showing an example of a frame structure of a wireless TDMA communication system, in which one time slot consists of a burst consisting of an information part, a synchronization sequence, and a tail pit;
It consists of a guard time to prevent overlap with adjacent bursts, and two of these time slots constitute one frame, and further P frames constitute one multiframe.

The burst types include normal burst, synchronous burst, etc., and the bit lengths of the information part and the synchronous sequence part in the burst differ depending on the type. Further, by repeating the burst, a broadcast channel, a control channel, a synchronization channel, a speech channel, etc. are configured.

Next, the operation will be explained.

Here, the operation regarding synchronous burst will be explained in detail.

First, when a burst on the wireless line is received by RXl,
DEMO2 demodulates using a predetermined demodulation method. Then, this demodulated burst is sent to BA3 at the timing specified by RX-TC5, and in BA3, only the information portion corresponding to the burst type specified by CH-8EL5 is extracted and output to CH-DEC4. This C
The H-DEC 4 decodes the information portion input from the BA 3 using an error control method according to the burst type designated by the CH-8 EL 5 and outputs it to the LCU 8.

The LCU 8 receives an interrupt from the M-TC 7 every frame, and performs software processing based on the contents of the data (error-controlled information portion) input from the CH-DEC 4 during the interrupt. Note that the above operation is RX-
Timing is controlled by TC6.

On the other hand, the DEMO2 correlates the demodulated burst with its synchronization sequence at the timing (interval) specified by the RX-TC5, and if the correlation is established, the RX-TC
5 and M-TC7. and,
Based on this synchronization detection signal, the RX-TC5 latches the internal counter value at the time of synchronization detection, uses this reception timing as the reference timing to match the synchronization detected timing, and thereafter performs timing control based on this synchronized reference point. conduct.

In addition, the M-TC7 also latches the internal counter value when the synchronization detection signal is received, the LCU8 checks these latched counter values every frame, and the M-TC7 checks the timing of the RX-TC6. Correct to match.

In addition, in Figure 4, there is an idle frame for one frame in which no burst is sent in one multiframe, and it is necessary to use this frame to read the contents of synchronization bursts of other wireless channels. There are cases. In this case, during the idle frame, the CH-8EL5 is designated as a synchronous burst, and the synchronous burst of another radio channel is waited for, and the LCU 8 inputs this burst as described above. On the other hand, since the timing of the RX-TC5 is synchronized with the synchronization burst of the other radio channel, the reception timing is shifted from the conventional received time slot, so the LCU 8 uses the M-T during this idle frame.
The internal counter value of the RX-TC6 is corrected to match the timing of C7. Note that during the idle frame, the LCU 8 does not perform correction to make the M-TC 7 match the RX-TC 6.

[Problem to be solved by the invention]

Since the conventional synchronous burst detection device is configured as described above, the timing controller control in the LCU for detecting synchronous bursts of other wireless channels in idle frames becomes complicated, and on the other hand, it is difficult to detect synchronous bursts. By doing so, the RX-T that matches the synchronization timing
Since two unrelated timing controllers, M-TC and M-TC, are required for detection of C and synchronous burst, there are problems such as an increase in the number of circuit components.

This invention was made to solve the above-mentioned problems, and it simplifies the synchronous burst detection operation of other wireless channels in an idle frame, and also allows the synchronous burst detection operation to be performed with a single timing controller. The purpose is to obtain a synchronous burst detection device.

[Means to solve the problem]

The synchronization burst detection device according to the invention of the first claim detects a synchronization burst of another radio channel at least in an idle frame, when a correlation between a burst demodulated by DEMO and a synchronization sequence is detected. Only then, the DgMO outputs the demodulated burst to the BA, and subsequent processing is performed without depending on the timing instructed by the RX-TC.

Further, the synchronization burst detection device according to the invention of the second claim outputs the demodulated burst to the BA at the timing instructed by the RX-TC, at least when detecting the synchronization burst of another radio channel in an idle frame. Only when the DEMO detects a correlation between the demodulated burst and the synchronization sequence, it outputs the information part extracted by this BA to the CH-DEC, and performs subsequent processing regardless of the timing instructed by the RX-TC. It was designed to do this.

[For production]

The DEMO in the invention of the first claim outputs the demodulated burst to the BA on condition that a correlation between the demodulated burst and the synchronization sequence is detected when detecting a synchronization burst of another radio channel in at least an idle frame. .

Further, in the BA of the invention of the second claim, when detecting a synchronization burst of another radio channel in at least an idle frame, a DEMO that outputs a demodulated burst at a timing instructed by the RX-TC synchronizes with the demodulated burst. The information portion is extracted from the demodulated burst and output to the CH-DEC on the condition that correlation with the synchronization sequence is detected.

[Embodiments of the invention]

Hereinafter, an embodiment of the invention of the first claim will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a synchronous burst detection device according to an embodiment of the invention of the first claim, and the same or corresponding parts as the conventional synchronous burst detection device (FIG. 3) are denoted by the same reference numerals. will be added and the explanation will be omitted.

In the figure, DEMO2 demodulates the received burst using a predetermined demodulation method at the timing of RX-TC5, and correlates this burst with the synchronization sequence. Then, only when the correlation is established, a synchronization detection signal is output to the RX-TC6, and the demodulated burst is output to BA3, and this BA3 operates only when there is an input of the DEMO2 (hereinafter referred to as Similarly, the processing
(performed only when input is received).

Next, the operation of the invention according to the first claim will be explained.

First, when the RXI receives a wireless TDMA burst, the DEMO2 demodulates the burst using a predetermined demodulation method at the timing instructed by the RX-Te3.
Correlate this burst with the synchronization sequence. Then, only when the correlation is established, a synchronization detection signal is output to the RX-TC6, and the demodulated burst is output to the BA3. In this RX-Te3, the D EMO2
When the CH-8EL5 receives a synchronization detection signal from For example, it will not be reset to synchronous timing, but if it is specified otherwise, it will be reset to synchronous timing.

On the other hand, BA3 extracts the information part from the burst according to the burst type designated by CH-8EL5 only when the burst demodulated by DEMO2 is input.

Then, the CH-DEC4 performs error control on this extracted information portion according to the burst type specified by the CH-8EL5, and outputs the demodulated information to the LCUg.

Note that if the burst type designation by CH-8EL5 is a synchronous burst designation in an idle frame, the above B
A3 and CH-DEC4 each extract the information part from the demodulated burst output from DEMO2 regardless of the timing instructed by RX-Te3, perform error control on this information part, and output it to LCUg, and LCU8 receives this data. Perform software control based on content.

In addition, in the above embodiment, DEMO2 sends the demodulated burst to BA3 only when there is a correlation between the -st and the synchronization sequence, regardless of the specified burst type of CH-8EL5. However, normally, the demodulated burst is output to BA3 regardless of the correlation detection of the synchronization sequence, and only when the burst type specified by CH-8EL5 is a synchronization burst with an idle frame and correlation is detected, BA3 is output. In other words, if CH-5EL5 instructs a synchronous burst in an idle frame (the configuration is the same as in FIG. 1), DEMO2゜BA3, CH-DE
The operations of C4 and LCUg are the same as in the above embodiment, but if CH-8EL5 specifies something other than a synchronization burst in an idle frame, data is sent to BA3 even if the DEMO2 cannot correlate with the synchronization sequence. This BA3 extracts the information portion corresponding to the burst type instructed by the nuclear CH-8EL5 and outputs it to the CH-DEC4. CH-DEC4 then performs error control on this information part, but since it is an error because it is not synchronized to begin with, the data read by LCUg is an error and there was no reception burst. Recognize.

Next, an embodiment of the invention according to the second claim will be described with reference to the drawings.

FIG. 2 is a block diagram showing the configuration of a synchronous burst detection device according to an embodiment of the invention of the second claim, and the same or equivalent parts as in FIGS. 1 and 3 are given the same reference numerals. omitted.

In the figure, 9 is a synchronization detection signal signal line for outputting a synchronization detection signal from DEMO2 to BA3 when a correlation between the demodulated burst and the synchronization sequence is detected. Demodulates the received burst at the timing instructed by BA, and sends this demodulated burst to BA.
3, and when a correlation between the demodulated burst and the synchronization sequence is detected, the RX-TC5 and B
It is configured to output a synchronization detection signal to A3.

Next, the operation of the invention according to the second claim will be explained.

DEMO2 is typically RX-
BA demodulated burst at the timing instructed by Te3
It is output to 3. And only if there is a correlation, then R
A synchronization detection signal is output to BA3 as well as X-TC5. As a result, the BA3 extracts the information part from the burst after demodulating and outputs it to the CH-DEC4,
The subsequent operation from the CH-DEC 4 to the LCU 8 is similar to the operation of the first aspect of the invention described above.

〔Effect of the invention〕

As described above, according to the invention of the first claim, when detecting a synchronization burst of another radio channel in at least an idle frame, the burst demodulated by the DEMO is detected from the DEMO on the condition that the correlation with the synchronization sequence is detected. According to the invention of the second claim, when detecting a synchronization burst of another radio channel in at least an idle frame, D
On the condition that the correlation between the demodulated burst by EMO and the synchronization sequence is detected, BA extracts the information part of the demodulated burst output from the DEMO at the timing instructed by RX-TC5, and outputs it to CHDEC. Therefore, the M-TC for detecting the synchronization burst in the idle frame is not required, and the timing controller control in the LCU is also not required.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a synchronous burst detection device according to an embodiment of the invention as claimed in the first claim, and FIG. 2 is a block diagram showing the configuration of a synchronous burst detection device according to an embodiment of the invention as claimed in the second claim. 3 is a block diagram showing the configuration of a conventional synchronous burst detection device, and FIG. 4 is a block diagram showing the configuration of a conventional synchronous burst detection device.
It is a figure which shows an example of the frame structure of A communication system. In the figure, 1 is RX, 2 is DEMO13 is BA, 4
is CH-DEC, 5 is CH-8EL, 5 is RX-TC,
g is an LCU, and 9 is a synchronization detection signal line. In addition, the same symbols in the figures indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation Figure 2 Figure 4

Claims (2)

[Claims] (1) A receiver that receives bursts on a wireless line, a demodulator that demodulates the bursts received by the receiver using a predetermined demodulation method, and extracts information from the bursts demodulated by the demodulator. a burst analyzer; a channel decoder that performs error control on the information portion extracted by the burst analyzer; a channel selector that specifies the type of received burst to the burst analyzer and channel decoder; In a synchronous burst detection device comprising a timing controller that performs timing control and a control section that performs control, at least when the channel selector specifies a specific burst type, demodulation demodulates the received burst at a timing instructed by the timing controller. On the condition that the demodulator detects the correlation between the demodulated burst and its synchronization sequence, the demodulator outputs the demodulated burst to the burst analyzer, and regardless of the timing instructed by the timing controller, the demodulated burst is output from the demodulator to the burst analyzer. A synchronous burst detection device characterized by performing processing. (2) A receiver that receives bursts on a wireless line, a demodulator that demodulates the bursts received by the receiver using a predetermined demodulation method, and extracts information from the bursts demodulated by the demodulator. a burst analyzer; a channel decoder that performs error control on the information portion extracted by the burst analyzer; a channel selector that specifies the type of received burst to the burst analyzer and channel decoder; In a synchronous burst detection device including a timing controller that performs timing control and a control unit that performs control, at least when the channel selector specifies a specific burst type, the burst demodulated at the timing instructed by the timing controller is On the condition that the demodulator outputting to the analyzer detects a correlation between the demodulated burst and its synchronization sequence, the information portion extracted from the burst analyzer is outputted to the channel decoder, and the information part is outputted to the channel decoder at the timing instructed by the timing controller. A synchronous burst detection device is characterized in that it performs subsequent processing regardless of the timing.