KR19990056192A - Decoding Device Using Deconvolution Method in Communication System - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

Decoding Device Used in Wireless Communication

I. The technical problem to be solved by the invention

A device that completely decodes coded data using the convolution method.

All. Summary of Solution of the Invention

The decoding apparatus of the communication system includes two deconvolution units for decoding the received data coded by the convolution method by a deconvolution algorithm, an adder for adding the decoded data from the two deconvolution units, and an output of the adder. A decoding apparatus using a deconvolution method in a communication system, characterized by comprising a dress hold for detecting an error of the received data.

la. Important uses of the invention

Any device that receives data coded by the convolution method

Description

Decoding Device Using Deconvolution Method in Communication System

The present invention relates to a device for decoding data coded using a convolution method in a communication system, and more particularly, to a decoding device using a deconvolution method.

In general, when communication is performed using a code division multiplexing method (CDMA), data is coded using a convolution method. In order to recover data normally coded using the deconvolution method, the data must be recovered using the deconvolution method. However, the mathematical algorithm of the deconvolution method has not been established in the past, so the deconvolution method cannot be used. Therefore, the first method of decoding the coded data using the deconvolution method uses the maximum approximate decoding method (MHL) and the second method uses the Viterbi decoding method.

However, the two methods of decoding have a problem that perfect decoding is difficult because recovery of coded data is probabilistic decoding. In addition, when an error of coded and transmitted data occurs adjacent to each other, it is difficult to detect a data error and recover an error of decoded data. Therefore, a deinterleaver circuit and a interleaver circuit must be provided at a receiver. .

Accordingly, an object of the present invention is to provide an apparatus for recovering data by decoding the coded data using the convolution method by the deconvolution method.

Another object of the present invention is to provide an apparatus for easily detecting and recovering error data when recovering data.

According to an aspect of the present invention, a decoding apparatus of a communication system includes two deconvolution units for decoding data received by being coded by a convolution method by a deconvolution algorithm, and decoded data from the two deconvolution units. And an dresser for detecting an error of data received by the output of the adder.

1 is a block diagram for performing convolutional coding at a rate of 1/2.

2 is a block diagram for decoding convolution coded data at a rate of 1/2.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of convolutional coding performed at a ratio of 1/2.

First, the data received at the input terminal converts a voice signal into a digital signal, encodes the voice signal, and inputs the voice signal converted into the digital signal into a shift register 10. The shift register 10 stores and shifts the input audio signal one bit at a time. In this embodiment, the shift register 10 includes a shift register composed of 8 bits. Accordingly, the shift register 10 inputs a digital signal deserialized in units of 8 bits and stores the input signal. In addition, the shift register 10 outputs data to the first modular adder 20 or the second modular adder 21. In this case, as shown in FIG. 1, data of all the shifter registers are not input to the first modular adder 20 and the second modular adder 21, but data is selectively input to the modular adders 20 and 21. For example, first, data input to the first modular adder 20 is collected by adding data input to register # 0, register # 2, register # 4, register # 6, and output the added value. Then, the data input to the second modular adder 21 receives and collects data of registers # 1, # 3, # 5 and # 7. Or the first modular adder collects and adds all register values of the shift register 10, the second modular adder collects and adds only values of registers # 0 and # 7, and adds the added values to the switch 30. Output The first modular adder 20 and the second modular adder 21 may be configured as an exclusive oragate (ex-OR), and data collected by the first modular adder 20 and the second modular adder 21 is pre-provisioned. Determined by Meanwhile, the switch 30 sequentially switches the data output from the first modular adder 20 and the second modular adder 21 once. Therefore, the output values of the first modular adder 20 and the second modular adder 21 are sequentially output. Coded data output from the switching unit 30 is modulated and amplified for transmission to be output as a radio signal through an antenna.

2 is a block diagram for decoding convolution coded data at a ratio of 1/2.

Hereinafter, the present invention will be described in detail with reference to FIG. 2.

First, before the description of FIG. 2, the convolutionally coded signal is wirelessly transmitted on a carrier frequency through the process of FIG. 1. Thus, the signal transmitted wirelessly receives the signal at the receiving end, and the carrier signal synthesized for the transmission is removed. When the carrier signal is removed, only convolution coded data of the voice signal remains. Accordingly, the convolution coded data is input to the first deconvolution unit 50 and the second deconvolution unit 60. Accordingly, the signals of C ₀ input to the first deconvolution unit 50 and C ₁ input to the second deconvolution unit 51 are the same. The same input signal is subjected to deconvolution coding by the first deconvolution unit 50 and the second deconvolution unit 51. The first deconvolution unit 50 and the second deconvolution unit 51 may be implemented by a DSP (DSP), and the deconvolution coding may be decoded in real time by programming the deconvolution equation into the DSP. . In addition, the data D ₀ decoded by the first deconvolution unit 50 and the data D ₁ decoded by the second deconvolution unit 51 are output to the adder 60. The adder may be implemented as an exclusive oar gate, and when the data is output by the first deconvolution unit 50 and the second deconvolution unit 51 when the exclusive oar gate is implemented, “0”. If the value of output is different, the value of “1” is outputted. Accordingly, the dress hold 70 may search for the exact position where an error of the received data occurs according to the value output from the adder 60. The signal output through the dress hold 70 becomes a digitized voice signal. Therefore, the digitized voice signal is converted into a normal voice signal so that the user can listen to the voice.

The contents described in the above embodiments have been described with respect to the conversion of the audio signal. However, the deconvolution decoding method may use not only the voice signal but also data that is convolutionally coded and transmitted and received. Therefore, recently, when data is coded by a convolutional coding method when performing a text service in a mobile phone and a pager, the data may be recovered by a deconvolutional decoding method.

As described above, by decoding the data transmitted by convolutional coding in a communication system using a deconvolution method, an accurate data value may be restored instead of an approximate data value. In addition, since there is no need to store track-back data necessary for the approximate data recovery, the memory capacity can be reduced. In addition, there is an advantage that can reduce the power required when searching the memory.

Claims (2)

In the decoding apparatus of the communication system, Two deconvolution units for decoding the received data coded by the convolution method by a deconvolution algorithm; An adder for adding the decoded data from the two deconvolution units; And a dress hold for detecting an error of data received by the output of the adder. The method of claim 1, wherein the two deconvolution unit, Decoding apparatus using a deconvolution method in a communication system, characterized in that the communication system comprising a de-convolution storing the deconvolution algorithm.