JP2001274774A - Information data transmission system and its transmitter and receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize synchronization between a pilot channel and an information channel with a small delay time, without the need for transmission of excess information through the pilot channel. SOLUTION: Interleave circuits 111-11n of a transmitter side sets the number of paths for convolution interleaving to be a measure of the number of bits equivalent to one frame of a control channel. Then an attachment circuit 14 attaches a path-switching timing to a frame head of a pilot channel as fixed pattern data in matching with a frame period of the pilot channel. A receiver side, however, detects the fixed pattern data from demodulated data of the pilot channel and switches selection paths of de-interleaving circuits 241-24n for each information channel to initial positions according to the detected timing. As a result, the receiver side can synchronize the pilot channel with the information channel in frame units of the pilot channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a control channel for transmitting control data separately from an information channel for transmitting information data, interleaves the information data on the transmission side, and receives the information data on the reception side. And an information data transmission system for deinterleaving the information.

[0002]

2. Description of the Related Art In an information data transmission system such as digital satellite communication and digital satellite broadcasting, a pilot channel for transmitting control data and the like is provided separately from a plurality of information channels for transmitting information data, and these channels are multiplexed. A transmission method has been proposed.

In this method, when interleaving data of a plurality of information channels, a plurality of types of interleaving lengths are prepared in advance in consideration of the state of a transmission path and the like.
It has been considered to select an optimal interleave length during transmission. In this case, if the interleave length is changed, the information channel and the pilot channel will not be synchronized. Therefore, on the transmitting side, parameters corresponding to the selected interleave length (corresponding to the number of interleave bits, the total number of frames of the channel, etc.) Is transmitted on a pilot channel, and on the receiving side, the pilot channel and the information channel are synchronized by the value of a parameter transmitted on the pilot channel.

[0004] How to synchronize the pilot channel and the information channel in the above system will be described with reference to timing charts shown in FIGS. 4 and 5.

FIGS. 4A and 4B show the synchronization timing relationship between a pilot channel and an information channel. FIG. 4A shows a pilot channel and FIG. 4B shows an information channel. FIG. 5 shows the relationship between the count value in the pilot channel and the interleave length.

In the pilot channel, as shown in FIG. 4, 3264 bits are taken as one frame, the frame is divided into 102 packets (32 bits each), and 32-bit synchronous data (CW) is inserted every other packet. , During which a unique word (32 bits) D
1, a count value (32 bits) D2 and data (32 bits) D3 to D51 are sequentially inserted.

The count value D2 indicates the number of channels corresponding to the interleave length, as shown in FIG. 5, and this count value is repeated from 1 to 512 in an interleave cycle. On the receiving side, when this count value D2 is 1, deinterleaving of the information channel is started, and when D2 becomes 512, deinterleaving is completed and synchronization of the pilot channel and the transmission information channel is realized.

However, according to the above-described method, the parameters (count values D2 = 1 to 51) are used in the pilot channel.
There is a problem that the transmission efficiency is reduced due to the transmission of 2). In addition, there is a problem that a delay of the maximum interleaving time occurs as a start timing of deinterleaving on the receiving side.

[0009]

As described above, in an information data transmission system having an information channel and a control channel, which has recently been proposed, a method of transmitting a parameter corresponding to an interleave length of an information channel through a control channel. Thus, there has been a problem that the transmission efficiency of the control channel is reduced, and a delay of the maximum interleaving time occurs as a deinterleaving start timing on the receiving side.

The present invention has been made in consideration of the above circumstances, and has been made in consideration of the above circumstances, and has been made in consideration of the above-described circumstances. It is an object of the present invention to provide a transmission system and a transmission device and a reception device thereof.

[0011]

To achieve the above object, an information data transmission system according to the present invention has the following characteristic configuration.

(1) In addition to a plurality of information channels for transmitting information data, a control channel for transmitting at least control data is provided. The information data is interleaved on the transmission side, and the information data received on the reception side is demultiplexed. In the information data transmission system that performs interleaving, on the transmission device side, adjust the interleave repetition cycle in the information channel to the control channel frame, and on the reception device side, detect the control channel frame, and based on the detection result, It is characterized in that synchronization between the control channel and the information channel on which the interleave processing is performed is established.

(2) In the configuration of (1), fixed pattern data is arranged in a frame of the control channel,
It is characterized in that a frame of the control channel is detected by detecting the fixed pattern data.

The information data transmission system according to the present invention is characterized in that the control channel and the interleaved information channel are synchronized in units of one frame of the control channel, and the control channel is detected by detecting only the frame position of the control channel. And interleaved information channels are synchronized.

For example, a convolutional interleave scheme or a scheme similar thereto is used as an information channel interleave scheme so that the number of convolutional interleave passes is a divisor of the number of bits corresponding to one frame of the control channel. As a result, the control channel and the interleaved information channel can be synchronized only by detecting the start timing of one frame of the control channel, that is, the timing of the first bit. This makes it possible to make the path of the convolutional interleave on the transmission side correspond to the path of the convolutional deinterleave on the reception side. The start timing of the control channel can be easily detected by using fixed pattern data (unique word) included at the head for detecting the control channel.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows the configuration of an information data transmission system according to the present invention, wherein A indicates a transmitting device, and B indicates a receiving device. In this system, a pilot channel is provided separately from the first to n-th information channels.

In the transmitting apparatus A, the data of the first to n-th information channels are respectively transmitted to the interleave circuit 11.
Interleaving of a predetermined interleave length is performed at 1 to 11n, digital modulation is performed at modulation circuits 121 to 12n, and then supplied to the multiplexing circuit 13. On the other hand, the pilot channel data is added with fixed pattern data (32 bits) called a known unique word in advance at the head of the frame by an adding circuit 14, digitally modulated by a modulation circuit 15, and then supplied to a multiplexing circuit 13. Is done. The multiplexing circuit 13 multiplexes digital data of each channel by multiplexing, for example, by code division multiplexing or frequency division multiplexing.

In the receiving apparatus B, the transmission signal transmitted through the transmission path is supplied to a separation circuit 21, where it is separated into a pilot channel and first to n-th information channels. ~ 23
n. Demodulated data of the first to n-th information channels are respectively deinterleaved circuits 241 to 24n.
And performs a deinterleave process of the same interleave length as that of the transmission side. The demodulated data of the pilot channel is supplied to a fixed pattern data detection circuit 25. The circuit 25 detects known fixed pattern data from the demodulated data of the pilot channel in advance, and determines the deinterleave start position of the information channel based on the detection timing of the fixed pattern data.

Here, a convolutional interleaving method (or a method similar thereto) is used as the interleaving method for the first to n-th information channels, and the number of paths of the convolutional interleaving corresponds to one frame of the control channel. (Ie, an integral multiple of the number of passes corresponds to one frame of the control channel).

The transmission side interleave circuit (111 to 1)
1n) and a deinterleave circuit (241 to 2
FIGS. 2A and 2B show a specific configuration of 4n).
In the drawing, the symbol □ indicates a delay element (delay) with a delay time j. The data of each information channel is switched cyclically in the frame cycle of the pilot channel from the path 0 to the path 50 shown in FIG. 2A in order or in a predetermined order.

The processing operation of the above configuration will be described below with reference to FIG.

First, on the transmitting side, the interleave circuit 1
In 11 to 11n, the number of convolutional interleaving passes (interleave repetition cycle) is set to be a divisor of the number of bits corresponding to one frame of the control channel. Then, the path switching timing is adjusted to the frame period of the pilot channel, and a unique word is inserted into the pilot channel at the beginning of the frame.

On the other hand, on the receiving side, a unique word is detected from the demodulated data of the pilot channel, and the deinterleave circuit 2 of each information channel is detected at the detection timing.
A reset signal for path switching is given to 41 to 24n.

By the above processing, as shown in FIG. 3, when a unique word is detected from the demodulated data of the pilot channel, the path of the information channel is switched to the initial position. 64 times the number of passes = 51 corresponds to one frame of the control channel. As a result, the pilot channel and the information channel are synchronized on a pilot channel frame basis.

Therefore, according to the information data transmission system having the above configuration, synchronization of the pilot channel and the information channel can be realized with a small delay time without transmitting extra information on the pilot channel.

[0027]

As described above, according to the present invention, there is provided an information data transmission system capable of synchronizing a control channel and an information channel without transmitting a parameter corresponding to the interleave length of the information channel on the control channel. The transmitting device and the receiving device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an information data transmission system according to an embodiment of the present invention.

FIG. 2 is an exemplary block diagram showing a configuration of an interleave circuit and a deinterleave circuit used in the embodiment;

FIG. 3 is a timing chart for explaining the processing operation of the embodiment.

FIG. 4 is a timing chart showing a synchronization timing relationship between a pilot channel and an information channel in a conventional information data transmission system.

FIG. 5 is a timing chart for explaining an interleave cycle of a conventional system.

[Explanation of symbols]

 A: Transmitting device B: Receiving device 111 to 11n Interleaving circuit 121 to 12n Modulating circuit 13: Multiplexing circuit 14: Additional circuit 15: Modulating circuit 21: Separating circuit 22, 231 to 23n Demodulating circuit 241 to 24n: De Interleave circuit 25 ... fixed pattern data detection circuit

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[Procedure amendment]

[Submission Date] September 18, 2000 (2009.1)
8)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Atsushi Miki, Inventor 1 at Komukai Toshiba-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Inside Toshiba R & D Center (72) Inventor Mutsuri Serizawa F-term (reference), Toshiba R & D Center, No. 1 town 5C063 AB05 AB06 CA23 CA31 CA40 5K014 AA01 FA16 HA05 HA10

Claims (6)

[Claims] A control channel for transmitting at least control data in addition to a plurality of information channels for transmitting information data, wherein the transmitting side interleaves the information data, and the receiving side deinterleaves the received information data. In the information data transmission system, the interleaving repetition period in the information channel is adjusted to the frame of the control channel, the receiving side detects the frame of the control channel, and is interleaved with the control channel based on the detection result. An information data transmission system characterized by establishing synchronization with an information channel. 2. The information data transmission system according to claim 1, wherein fixed pattern data is arranged in the control channel frame, and the control channel frame is detected by detecting the fixed pattern data. 3. A control channel for transmitting at least control data in addition to a plurality of information channels for transmitting information data, wherein the transmitting side interleaves the information data and the receiving side deinterleaves the received information data. A transmission apparatus for an information data transmission system, wherein the transmission apparatus is used in an information data transmission system that performs the following, wherein an interleave repetition cycle in the information channel is adjusted to a frame of the control channel. 4. The transmitting apparatus for an information data transmission system according to claim 3, wherein fixed pattern data is arranged in a frame of said control channel. 5. A control channel for transmitting at least control data separately from a plurality of information channels for transmitting information data, wherein the transmitting side interleaves the information data and the receiving side deinterleaves the received information data. When the transmitting side adjusts the interleave repetition cycle in the information channel to the frame of the control channel, the control side detects the frame of the control channel and performs control based on the detection result. A receiver for an information data transmission system, wherein synchronization between a channel and an information channel on which interleaving processing is performed is established. 6. The information according to claim 5, wherein when fixed pattern data is arranged in the frame of the control channel, the frame of the control channel is detected by detecting the fixed pattern data. Receiving device of data transmission system.