JP2751675B2 - Digital wireless transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter for converting N columns of digital input signals into M columns for wireless transmission, and a receiver for converting the wirelessly received M columns of digital input signals to N columns for reception and output. More particularly, the present invention relates to a column conversion system.

[0002]

2. Description of the Related Art A digital radio having a transmitting side for converting an N-column digital input signal into an M-column and wirelessly transmitting the same, and a receiving side for converting the wirelessly received M-column digital input signal into an N-column and receiving and outputting the same. A conventional column conversion method in a transmission system is, for example, as shown in FIG. FIG.
The column conversion method when N = 3 and M = 4 is shown.

In FIG. 2A, on the transmitting side, 3-4
The column conversion circuit 106 converts the synchronized three columns of digital input signals (1-1 to 1-3) into four columns of digital signals (2-1).
To 2-4).

The first speed conversion circuit 107 converts the digital signal (2-1 to 2-4) by m / n times (n is an integer of 1 or more, in order to add a radio overhead bit to the main data signal). m is an integer of m ≧ n + 1) and outputs digital signals (3-1 to 3-4). The speed-converted digital signals (3-1 to 3-4) are modulated outside the figure and wirelessly transmitted.

Next, in FIG. 2B, on the receiving side,
The received and demodulated digital signals (3-1 to 3-4) are input to the frame synchronization detection circuit 105 and the second speed conversion circuit 108.

[0006] The frame synchronization detection circuit 105 establishes a wireless frame by the digital signal (3-1 to 3-4) and outputs a frame pulse 7 indicating a frame configuration.

The second speed conversion circuit 108 generates a digital signal (3-1 to 3-) based on the frame pulse 7.
The radio overhead bits are separated from 4), the arrangement section of the radio overhead bits is removed, and digital signals (4-1 to 4-4) converted to n / m-times speed are output.

The 4-3 column conversion circuit 109 converts the 4 columns of digital signals (4-1 to 4-4) into 3 columns of digital signals (5-1 to 5-3) and outputs them.

[0009]

In the above-described conventional column conversion method, since the transmitting side and the receiving side perform the converting operation independently, the input digital signal 1-1 on the transmitting side is converted into the output digital signal 5- on the receiving side. There is a problem that it is not always output as 1 and it is unclear which of 5-1 to 5-3 (that is, there is uncertainty).

An object of the present invention is to provide a digital radio transmission system provided with a column conversion method that enables an input data sequence on the transmission side and an output data sequence on the reception side to have the same arrangement order.

[0011]

To achieve the above object, a digital radio transmission system according to the present invention has the following configuration. That is, the digital wireless transmission system of the first invention is a digital wireless transmission system for converting N columns of digital input signals into M columns and wirelessly transmitting them; the transmitting side converts the N columns of digital input signals into M columns. Means for outputting a timing pulse (radio frame pulse) of a radio frame (an integer multiple of N × M bits);
In order to add an overhead bit to the digital signal converted into the M sequence, the speed of the digital signal converted into the M sequence and the frequency of the radio frame pulse are set to m / n (n is an integer of 1 or more, and m is (m ≧ n + 1 integer) times, and means for performing additional control for adding an overhead bit by the converted radio frame pulse.

A digital wireless transmission system according to a second aspect of the present invention is a digital wireless transmission system for converting a digitally received digital signal of M columns into N columns and receiving and outputting the received signal. from the digital input signal to establish synchronization radio frame, the radio frame
Means for generating and outputting a radio frame pulse as a timing pulse of (an integer multiple of N × M bits) ; and separating and deleting overhead bits from the radio input digital signal of M columns in accordance with the radio frame pulse; Means for converting the M-sequence digital signal from which the overhead bit arrangement section has been removed into an M-sequence digital signal at n / m times speed, and converting the frequency of the radio frame pulse to n / m times; The M-sequence digital signal whose speed has been converted is converted into an N-sequence digital signal based on the radio frame pulse whose frequency has been converted .
Means for converting while maintaining the correspondence .

[0013]

Next, the operation of the digital radio transmission system of the present invention configured as described above will be described. In the present invention, both the transmitting side and the receiving side perform column conversion in synchronization with a radio frame pulse. As a result, the input data in the first column on the transmitting side is also output as the data in the first column on the receiving side, so that the input data sequence on the transmitting side and the output data sequence on the receiving side have the same arrangement order. Thus, it is possible to provide a digital wireless transmission system having a column conversion method that can be realized.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a transmitting side and a receiving side in a digital wireless transmission system according to one embodiment of the present invention.
Note that the column conversion method in the present embodiment is N
= 3 and M = 4.

In FIG. 1A, on the transmitting side, 3-4
The column conversion circuit 101 converts the synchronized three columns of digital input signals (1-1 to 1-3) into four columns of digital signals (2-1).
To 2-4) and output the radio frame (N ×
A timing pulse (wireless frame pulse) 6 of an integer multiple of M bits is output. These are output to the first speed conversion circuit 102.

After the first speed conversion circuit 102 is initialized by the radio frame pulse 6 from the 3-4 row conversion circuit 101, the speed conversion operation is performed on the digital signal (2-1 to 2-4) and the radio free pulse 6. do. That is, in order to add a radio overhead bit to the main data signal of the digital signal (2-1 to 2-4), the speed of the digital signal (2-1 to 2-4) and the frequency of the radio frame pulse 6 are set to m. / N times (n is an integer of 1 or more, m is m ≧ n
(Integer of +1), and a radio overhead bit is added according to the radio frame pulse after the conversion. The speed-converted digital signals (3-1 to 3-4) are modulated outside the figure and wirelessly transmitted.

Next, in FIG. 1B, on the receiving side,
The received and demodulated digital signal (3-1 to 3-4) is supplied to a frame synchronization detection circuit 105 and a second speed conversion circuit 103.
To enter.

The frame synchronization detection circuit 105 establishes a radio frame by the digital signal (3-1 to 3-4) and outputs a radio frame pulse 7 indicating the frame configuration.

The second speed conversion circuit 103 generates a digital signal (3-1) based on the radio frame pulse 7.
3-4), the separation of the radio overhead bits and the section where the radio overhead bits are arranged are removed, and the digital signal (4-1) is converted to an n / m-fold speed.
4-4), and outputs a radio frame pulse 8 obtained by converting the frequency of the radio frame pulse 7 to n / m times.

After being initialized by the radio frame pulse 8, the 4-3 column conversion circuit 104 converts the 4 columns of digital signals (4-1 to 4-4) into the 3 columns of digital signals (5-1 to 5). -3).

Thus, since the transmitting side and the receiving side perform column conversion at the same frame timing, the digital input signal 1-1 on the transmitting side is output as the digital signal 5-1 in the first column on the receiving side. And the transparency is maintained.

[0022]

As described above, according to the digital radio transmission system of the present invention, both the transmitting side and the receiving side perform the column conversion in synchronization with the radio frame pulse.
The input data in the first column on the transmitting side is also output as data in the first column on the receiving side, so that the input data sequence on the transmitting side and the output data sequence on the receiving side have the same arrangement order. There is an effect that a digital wireless transmission system having a possible column conversion method can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a transmission side (a) and a reception side (b) in a digital wireless transmission system according to one embodiment of the present invention.

FIG. 2 is a configuration block diagram of a transmission side (a) and a reception side (b) in a conventional digital wireless transmission system.

[Explanation of symbols]

 101 3-4 row conversion circuit 102 1st speed conversion circuit 103 2nd speed conversion circuit 104 4-3 row conversion circuit 105 Frame synchronization detection circuit

Claims (2)

(57) [Claims] 1. A digital radio transmission system for converting an N-column digital input signal into an M-column and wirelessly transmitting the digital-input signal; a transmitter converts an N-column digital input signal into an M-column and transmits a radio frame (N × Integer multiple of M bits)
Means for outputting a timing pulse (radio frame pulse) of the following; and for adding an overhead bit to the digital signal converted into the M series, the speed of the digital signal converted into the M series and the frequency of the radio frame pulse Means for converting the number of times to m / n (n is an integer of 1 or more, m is an integer of m ≧ n + 1), and performing additional control for adding an overhead bit by the converted radio frame pulse. A digital wireless transmission system characterized by the following. 2. A digital radio transmission system for converting an M-column digital input signal received wirelessly into an N-column and receiving and outputting the converted signal; a receiving side establishes wireless frame synchronization from the M-column digital input signal received wirelessly. And wireless
Frame (an integer multiple of N × M bits)
The overhead bits are separated removed from the digital input signal of the radio received M column according to the radio frame pulse; and means for generating and outputting a radio frame pulse of
The digital signal of M columns from which the overhead bit arrangement section is removed is converted into a digital signal of M columns at a speed of n / m times, and the frequency of the radio frame pulse is changed to n / m.
means and for converting the m times; each column signal a digital signal of the speed converted M columns to digital signals of N rows based on a radio frame pulse obtained by converting the frequency and the transmitting side 1
Means for performing conversion while maintaining a one-to-one correspondence relationship .