JP3268335B2 - Apparatus and method for multiplexing additional information - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an additional information multiplexing apparatus and method for multiplexing additional information related to wired and wireless digital transmission in a frame.

[0002]

2. Description of the Related Art In conventional digital radio transmission, information is transmitted by multiplexing various kinds of additional information into a main signal.
For example, there are a frame synchronization signal, a digital service signal, a control signal, and an alarm signal for synchronizing frames between the transmitting and receiving stations. Among these additional information,
A conventional example of multiplexing additional information indicating information in two states of "H" or "L" will be described below with reference to FIGS.

FIG. 3 is a block diagram showing an example of a conventional additional information multiplexing apparatus, and FIG. 4 is a timing chart thereof.

A frame cycle signal generation circuit A generates a frame cycle signal 102 indicating a basic structural unit (hereinafter, frame) of a wireless multiplexed frame from an input clock 101. The time base generation circuit B to which the frame period signal 102 is input generates a timing signal 103 indicating a time slot for multiplexing N types of additional information based on the signal 102. The multiplexing circuit C to which the timing signal 103 is input multiplexes N types of additional information 105 in one frame according to the timing signal 103 to generate a multiplexed signal 106. At this time,
When the number of bits of the main signal 104 in one frame is M bits, since N bits of additional information are multiplexed on M bits, the length of one frame is M + N bits, and the main signal transmission efficiency is M / (N + M). )... (1).

[0005]

As described above, when N types of additional information are multiplexed in one frame, the transmission efficiency of the main signal decreases as the additional information increases.

An object of the present invention is to provide an apparatus and method for multiplexing additional information in which the transmission efficiency of a main signal does not decrease even if the additional information to be transmitted increases.

[0007]

According to a first aspect of the present invention, there is provided a frame period signal generating circuit for indicating a basic configuration unit of a multiplexed frame from an input clock, wherein "H", In an additional information multiplexing apparatus for wireless communication that multiplexes additional information indicating information in two states of “L”, the frame period signal is N ( N is an integer of 4 or more).
That) divides by a frequency divider to generate a divide-by-N signal, consecutive T of the timing signal indicating the time slots for multiplexing additional information, all the bits are "H" or "L"
(T is an odd number of 3 or more) A time base generating circuit for generating multiplexed identification information of bits, and the multiplexed identification information at a fixed position of the first frame of the frame indicated by the N-divided signal. The multiplexed information is multiplexed with continuous T bits obtained by inverting the state of the multiplex identification information at a fixed position of each frame subsequent to the first frame, and each frame period signal is based on the multiplex identification information. A multiplexing circuit for sequentially multiplexing N pieces of additional information in a time slot indicated by the timing signal in a time- division manner, wherein the multiplexed identification information and the state-inverted continuous T bits are multiplexed.
Characterized in that as subjected to frame synchronization by majority decision in a signal reception side.

According to a second aspect of the present invention, there is provided a frame period signal generating circuit for indicating a basic configuration unit of a multiplexed frame from an input clock.
In an additional information multiplexing apparatus for wired communication that multiplexes additional information indicating information in two states of "H" and "L", the frame period signal is frequency-divided by N ( N is an integer of 4 or more ). A frequency dividing circuit for generating a frequency-divided N signal, a timing signal indicating a time slot for multiplexing additional information, and a continuous T in which all bits are “H” or “L” (T is an odd number of 3 or more) A time base generating circuit for generating multiplexed identification information of bits; and multiplexing the multiplexed identification information at a fixed position of the first frame of the frame indicated by the N-divided signal. At the fixed position of each subsequent frame, continuous T bits obtained by inverting the state of the multiplex identification information are multiplexed, and based on the multiplex identification information,
A multiplexing circuit for sequentially multiplexing N pieces of additional information in a time slot indicated by the timing signal for each of the frame period signals and in a time-division manner , wherein the multiplexed identification information and the state-inverted continuous T It is characterized in that the signal of a bit is subjected to frame synchronization by making a majority decision on the receiving side.

A third solution of the present invention for solving the above-mentioned problems is to provide a multiplexing method comprising a frame period signal generating circuit for generating a frame period signal indicating a basic structural unit of a multiplexed frame from an input clock, and a time base generating circuit. An additional information multiplexing apparatus for multiplexing additional information indicating information in two states of "H" and "L", comprising an multiplexing circuit and an information processing apparatus. N
The information processing device generates a frequency-divided frequency-divided signal, a timing signal indicating a time slot for multiplexing the additional information, and all the bits being “H” or “L”. Multiplexed identification information consisting of consecutive T bits (T is an odd number of 3 or more) is generated by the time base generating circuit, and the multiplexing circuit generates the multiplexed identification information of the first frame indicated by the frequency-divided signal. The multiplexed identification information is multiplexed in the fixed position, and continuous T bits obtained by inverting the state of the multiplexed identification information are multiplexed in the fixed position of each frame subsequent to the first frame. As a reference, N pieces of additional information are sequentially multiplexed in the time slot indicated by the timing signal for each of the frame period signals and in a time-division manner, and the multiplex identification information and the state counter are multiplexed.
The received T-bit signal is multiplexed so as to be used for frame synchronization by making a majority decision on the receiving side.

[0010]

Next, an embodiment of the present invention will be described below with reference to the drawings. 1 and 2, the same components as those of the conventional example of FIGS. 3 and 4 are denoted by the same reference numerals. FIG. 1 is a block diagram showing an embodiment of the additional information multiplexing apparatus according to the present invention, and FIG. 2 is an operation timing chart of the embodiment.

A frame cycle signal 102 output from a frame cycle signal generation circuit A to which an input clock 101 is input.
Is input to the time base generating circuit D and the N frequency dividing circuit E, and the frame period signal generating circuit A
01 generates a frame period signal 102 indicating one frame size of the wireless multiplexed frame. The N-divider circuit E generates a N-divided signal 108 obtained by dividing the frame period signal 102 by 1 / N, and outputs it to the time base generator D.
This time base generation circuit D is a frame period signal 102
A multiplexing circuit generates a timing signal 107 indicating a time slot for multiplexing additional information and multiplexing identification information 110 for identifying a first frame of a frame group composed of N frames. Output to F. This multiplexing identification information 110 is the T
(T is an odd number of 3 or more) is composed of consecutive time slots at fixed positions. In the first frame, all of those T bits are information 110 composed of active level “1”. Other frames are composed of T bits of “0”, and when the first frame is detected, the number of signals whose signal level of each bit of the multiplex identification information 110 is “1” is counted. Then, in the case of T = 3, if the number of "1" is a majority of 2 or more, a majority decision is made to judge that frame as the first frame.

A multiplexing circuit F multiplexes the multiplexing identification information 110 and, based on the multiplexing identification information 110, N types of additional information 105
Are sequentially multiplexed into one time slot in a frame determined by the timing signal 107 to generate a multiplexed signal 109. At this time, if the number of bits of the main signal 104 in one frame is M bits, the length of one frame is M + T + 1 bits, and the main signal transmission efficiency is M / (M + T + 1).

Accordingly, a comparison of the main signal transmission efficiency between the present embodiment and the conventional example when multiplexing N types of additional information satisfying N ≧ T + 1 is as follows: M / (M + T + 1) ≧ M / (M + N) (2) Therefore, the present invention improves the main signal transmission efficiency.

In the above example, the transmission path has been described as being wireless, but it may be wired.

[0015]

As described above, according to the present invention, when N types of additional information are multiplexed, the main signal transmission efficiency can be improved by time-division multiplexing based on the multiplex identification information. it can. Therefore, if the number of items of additional information increases,
In the past, the transmission capacity increased and the wireless occupied band increased
According to the present invention, the number of additional information items is
Even if it increases, the increase in transmission capacity can be suppressed.
The line occupied band can also be suppressed. This allows the characteristics of wireless devices
Mitigation is possible and overall system cost can be reduced
There is also an effect. In addition, the multi-frame configuration
Multiplex identification information different from the frame synchronization pattern in the
Frame synchronization until the main signal passes because of the reference configuration
This has the effect of not deteriorating the pull-in time.
You. Furthermore, multiplexing / demultiplexing of multiplex identification information and additional information
In this case, it is easy to consider
There is fruit.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a timing chart of the embodiment of the present invention shown in FIG. 1;

FIG. 3 is a block diagram of a conventional example.

FIG. 4 is a timing chart of a conventional example.

[Explanation of symbols]

 A frame period signal generation circuit B time base generation circuit C multiplexing circuit D time base generation circuit E N frequency dividing circuit F multiplexing circuit 101 input clock 102 frame period signal 103 timing signal 104 main signal 105 additional information 106 multiplexed signal 107 Timing signal 108 N-divided signal 109 Multiplexed signal 110 Multiplexed identification information

Claims (3)

(57) [Claims] A frame period signal generating circuit for indicating a basic configuration unit of a multiplexed frame from an input clock;
In an additional information multiplexing apparatus for wireless communication that multiplexes additional information indicating information in two states of “H” and “L”, the frame period signal is N ( N is an integer of 4 or more ).
A frequency dividing circuit for generating a frequency-divided N signal, a timing signal indicating a time slot for multiplexing additional information, and a continuous T in which all bits are “H” or “L” (T is 3 A time base generating circuit for generating multiplexed identification information of the above-mentioned odd numbered bits; and multiplexing the multiplexed identification information at a fixed position of the first frame of the frame indicated by the N-divided signal. At the fixed position of each frame following the frame, continuous T bits obtained by inverting the state of the multiplex identification information are multiplexed, and each frame period signal is time-division-divided based on the multiplex identification information. and a multiplexing circuit for sequentially multiplexing the N pieces of additional information in the time slots indicated by said timing signal, said multiplexing identification information and the state obtained by multiplexing
An additional information multiplexing apparatus characterized in that the inverted continuous T-bit signal is subjected to a majority decision on the receiving side to be used for frame synchronization. 2. A frame period signal generating circuit which indicates a basic structural unit of a multiplexed frame from an input clock,
In an additional information multiplexing apparatus for wired communication that multiplexes additional information indicating information in two states of “H” and “L”, the frame period signal is set to N ( N is an integer of 4 or more ).
A frequency dividing circuit for generating a frequency-divided N signal, a timing signal indicating a time slot for multiplexing additional information, and a continuous T in which all bits are “H” or “L” (T is 3 A time base generating circuit for generating multiplexed identification information of the above-mentioned odd numbered bits; and multiplexing the multiplexed identification information at a fixed position of the first frame of the frame indicated by the N-divided signal. At the fixed position of each frame following the frame, continuous T bits obtained by inverting the state of the multiplexing identification information are multiplexed, and based on the multiplexing identification information, each frame period signal and the time division and a multiplexing circuit for sequentially multiplexing the N pieces of additional information in the time slot indicated by the timing signal, the multiplexed identification information and the state obtained by multiplexing
An additional information multiplexing apparatus characterized in that the inverted continuous T-bit signal is used for frame synchronization by making a majority decision on the receiving side. 3. A signal processing apparatus comprising: a frame period signal generating circuit for generating a frame period signal indicating a basic structural unit of a multiplexed frame from an input clock; a time base generating circuit; a multiplexing circuit; In an additional information multiplexing method of an additional information multiplexing apparatus that multiplexes additional information indicating information in two states of L ″, the frame period signal is N ( N is an integer of 4 or more ).
A frequency-divided signal is generated in the information processing apparatus, and a timing signal indicating a time slot for multiplexing additional information and a continuous T in which all bits are “H” or “L” (T is 3 The time base generation circuit generates multiplexing identification information consisting of the above-mentioned odd number bits. The multiplexing circuit outputs the multiplexing identification information at a fixed position of the first frame indicated by the frequency-divided signal. Multiplex information,
At the fixed position of each frame after the first frame, continuous T bits obtained by inverting the state of the multiplexing identification information are multiplexed, and based on the multiplexing identification information, every frame period signal and in a time-division manner. N pieces of additional information are sequentially multiplexed in a time slot indicated by the timing signal, and the multiplexing identification information and the state-inverted continuous T-bit signal are transmitted.
A method for multiplexing additional information, wherein signals are multiplexed so as to be used for frame synchronization by making a majority decision on a receiving side.