JPH066399A - Data transmitting method - Google Patents

Abstract

PURPOSE:To decrease an error of an important bit which is high in bit sensitiv ity by converting the arrangement of sent data in consideration of bit sensitivity corresponding to the likelihood at the time of demodulation. CONSTITUTION:When a data group D1 (d4, d3, d2, and d1) outputted from a transmission-side digital mobile communication device 30 by a sent data controller 31 is inputted to an interleaving device 32, the device 32 converts the data arrangement. At this time, the device 32 generates a data group D2 (d1, d2, d4, and d3) whose data arrangement is converted in consideration of bit sensitivity for the data group D1. A hexadecimal orthogonal amplitude modulating device 33 performs hexadecimal orthogonal amplitude modulation from the data group D2 with symbols having I and Q phases and amplitude information as a carrier and the symbols S are sent from an antenna 34. Then when the data group D1 is sent, data with high bit sensitivity is arranged at a data position where the likelihood at the time of demodulation is high. Then a reception- side digital communication device 33 can prevents an error of high-sensitivity data from being generated at the time of the demodulation of the symbols S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission method, and more particularly to a data transmission method suitable for transmitting 16-value quadrature amplitude modulation of transmission data such as voice data having different bit sensitivities.

[0002]

2. Description of the Related Art Conventionally, in transmitting and receiving data between digital mobile communication devices, first, in a transmission data control device on the transmission side, as shown in FIG.
1 is arranged at a designated data position and the data group D1 (d ₄ ,
d _3, as d _2, d _1), and outputs to the Intaribu device, in Intaribu device outputs the data arrangement as randomized in the data group _{D2 (d 2, d 3,} d 1, d 4), the data group in D2 a 16 quadrature amplitude modulation system, modulates the data group _{D2 (d 2, d 3,} d 1, d 4) I, the symbol S having a phase and amplitude information of the Q, the antenna symbol S as a carrier wave output The configuration to output from is adopted. The symbol S is received by the antenna of the digital mobile communication device on the receiving side and input to the 16-ary quadrature amplitude demodulating device on the receiving side. In this 16-value quadrature amplitude demodulation device, I and Q which are phase and amplitude information of the received symbol S
The received data is reproduced depending on the value of.

Now, the data output from the transmission data control device is output.
When the data group D1 is (0110), the interleave device
Output D2 is (1100), and 16-value quadrature amplitude modulation
The phase and amplitude information I, Q of the device output S is shown in FIG.
As described above, I = 3 and Q = -1. And this information
The 16-sided quadrature amplitude demodulation device on the receiving side that received
From the phase and amplitude information I = 3, Q = -1 of the symbol S,
The data group D2 (1100) is output. That is, the symbol
Data group (φ_Four, Φ₃, Φ ₂, Φ₁)
Data position φ for each data position_FourQ ≧
Φ when 0_Four= 0, and φ when Q ≦ 0_Four= 1
To do. Data position φ₃Regarding, when | Q | ≧ 2
φ₃= 0, and when | Q | ≦ 2, φ₃= 0. Day
Position φ₂Regarding, φ when I ≧ 0₂= 0, I
Φ when ≦ 0₂= 1. Data position φ₁Regarding
Is φ when | I | ≧ 2₁= 0 and | I | <2
Is φ₁The data is reproduced with = 1.

The data group D2 reproduced in this way
_{(D 2, d 3, d} 1, d 4) is converted to the received original data set by Intaribu device side _{D1 (d 4, d 3,} d 2, d 1), to the data reception data control unit The data is output and the data transmission is completed.

[0005]

However, in the above-described conventional data transmission method, when randomizing the data arrangement of the transmission data, the data positions φ ₃ and φ _{1 in} one symbol due to the characteristics of 16-value quadrature amplitude modulation. , The data value is 1, it is a data position that is more likely to be erroneous than the upper limit of the likelihood value is determined, and high bit sensitivity is important when performing 16-value quadrature amplitude modulation by randomizing regardless of the bit sensitivity of transmission data. Some information is wrong.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a data transmission method capable of reducing errors in important bits having high bit sensitivity.

[0007]

In order to achieve the above object, the present invention, when transmitting a transmission data group arranged at a designated data position, sets the data arrangement of each transmission data to the likelihood at the time of demodulation. A data transmission method is adopted in which conversion is performed in consideration of the corresponding bit sensitivity, and the transmission data group in which the data arrangement is converted is subjected to multilevel quadrature amplitude modulation and transmitted.

[0008]

According to the present invention, since the data arrangement of each transmission data is converted in consideration of the bit sensitivity in the likelihood at the time of demodulation, the present invention has a high bit sensitivity at a data position having a high likelihood at the time of demodulation. Data is arranged, and it is possible to reduce errors in data having high bit sensitivity.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, a transmission digital mobile communication device 30 and a reception digital mobile communication device 35 are provided as a digital mobile communication system. The transmitting digital mobile communication device 30 is a transmission data control device 3.
1, interleaver 32, 16-valued quadrature amplitude modulator 3
3 and the transmitting antenna 34 are provided. on the other hand,
The receiving digital mobile communication device 35 includes the receiving antenna 3
6, 16-ary quadrature amplitude demodulator 37, deinterleaver 3
8 and a reception data control device 39.

As shown in FIG. 1, the transmission data control device 31 arranges the transmission data group D1 (d ₄ , d ₃ , d ₂ , d ₁ ) at a designated position and outputs it to the interleave device 32. It has become. The interleaver 32 arranges the data group D1 at a data position having a high likelihood at the time of demodulation, and outputs the data group D2 (d ₁ , d ₂ , d ₄ , d ₃ ) as data group D2. There is. The 16-value quadrature amplitude modulator 33 uses the data group D2 (d ₁ , d ₂ , d ₄ , d ₃ ) to I, Q.
The symbol S having the phase and amplitude information of 1 is output to the transmitting antenna 34 as a carrier wave output.

On the other hand, the 16-value quadrature amplitude demodulation device 37 uses the values of I and Q which are the phase and amplitude information of the symbol S received by the receiving antenna 36, and the data group D2 (d ₁ , d ₂ ,
d _4, d ₃₎ is adapted to play. In this case, as shown in FIG. 3, for each data position of the data group (φ ₄ , φ ₃ , φ ₂ , φ ₁ ) reproduced by the symbol S, Q ≧ 0 for the data position φ ₄ . Then φ ₄ = 0,
When Q ≦ 0, φ ₄ = 1. Regarding the data position φ ₃ , when | Q | ≧ 2, φ ₃ = 0, and | Q | ≦ 2
Then φ ₃ = 0. For the data position φ ₂ , I
When ≧ 0, φ ₂ = 0, and when I ≦ 0, φ ₂ = 1. For data position φ ₁ , φ when | I | ≧ 2
_{When 1} = 0, when | I | <2, φ ₁ = 1 is set and data is reproduced. The data group D1 (d ₄ , d ₃ , d) converted into the data position as shown in FIG. 1 by the deinterleave device 38.
₂ , d ₁ ) is output to the reception data control device 39, and the data transmission is completed.

In the above configuration, when the data group D1 (d ₄ , d ₃ , d ₂ , d ₁ ) output from the transmission data control device 31 from the transmission side digital mobile communication device 30 is input to the interleave device 32, The interleave device 32 is
Bit sensitivity data group _{D1 (d 1 ≧ d 4 ≧} d 2 ≧ d 3) in consideration of converting the data arrangement data group D2 (d _1, d _2,
d _4, d ₃₎ generates, the data group _{D2 (d 1, d 2,} d
₄ and d ₃ ) to 16-ary quadrature amplitude modulation using a symbol having I and Q phase and amplitude information as a carrier in the 16-ary quadrature amplitude modulator 33, and the symbol S is transmitted from the antenna 34. That is, the data group D1
When (d ₄ , d ₃ , d ₂ , d ₁ ) is transmitted, since conversion is performed so that data having high bit sensitivity is arranged at a data position having high likelihood at the time of demodulation, transmission is performed. It is possible to prevent an error from occurring in data having high bit sensitivity when the symbol S is demodulated by the digital communication device 35.

[0014]

According to the present invention, as apparent from the above embodiment, the data arrangement of each transmission data is converted in consideration of the bit sensitivity according to the likelihood at the time of demodulation.
It is possible to prevent an error from occurring in important data having high bit sensitivity.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of data arrangement conversion for explaining a data transmission method of the present invention.

FIG. 2 is a block diagram of a digital mobile communication system to which the present invention is applied.

FIG. 3 is a spatial signal diagram of 16-ary quadrature amplitude modulation.

FIG. 4 is a conceptual diagram of data layout conversion of a conventional example.

[Explanation of symbols]

 30 Digital Mobile Communication Device for Transmission 31 Communication Data Dedicated Device 32 Interleave Device 33 16-ary Quadrature Amplitude Modulation Device 34 Transmitting Antenna 35 Digital Mobile Communication Device for Reception 36 Receiving Antenna 37 16-ary Quadrature Amplitude Demodulating Device 38 Deinterleave Device 39 Reception Data Control Device

Claims (1)

[Claims] 1. When transmitting a transmission data group arranged at a designated data position, the data arrangement of each transmission data is converted in consideration of bit sensitivity according to the likelihood at the time of demodulation, and the data arrangement is converted. Data transmission method for transmitting multi-valued quadrature amplitude modulation of a transmission data group.