KR20040041881A - Time Matrix Modulation with Run-Length compression method for communication system - Google Patents

Abstract

PURPOSE: A data transmitting method in a communication system using a 2-channel run-length coding method and its recording medium are provided to increase the capacity of a system by shortening data transmission time. CONSTITUTION: A channel encoding module(10) analyzes inputted data and generates information data to be transmitted to a channel 1 and repetition number data to be transmitted to a channel 2. A multiple access encoding module(20) performs a coding to differentiate channels. A signal modulating module(30) modulates data transmitted from the multiple access encoding module(20) so as to be transmitted to a receiving side. A transmitter(40) sends modulated data through an antenna. A receiver receives wireless data transmitted from the transmitter(40). A signal demodulating module(60) demodulates the wireless data. A module(70) performs a multiple access decoding(70) on the demodulated data. A channel decoding module(80) restores data transmitted through the channels 1 and 2 to their original data streams.

Description

Data transmission method and communication medium in communication system using 2-channel RUCｎ-Ｌｅｎｇｔｈ coding method {Time Matrix Modulation with Run-Length compression method for communication system}

The present invention relates to a data transmission method in a CDMA communication system using a two-channel run-length coding method, and more particularly, by mutual interference, such as a code division multiple access (CDMA) system using a time-based coding method. In a communication system of limited capacity, the present invention relates to a synchronous time-based encoding method and apparatus for increasing the capacity of a usable system and efficiently transmitting data while minimizing power consumed for data transmission.

In CDMA-based systems, all users share frequency, multiple access methods are provided by transmit power, and each user is distinguished by different orthogonal codes. In a CDMA-based system, data requiring different data rates and quality of service requirements are spread over different orthogonal codes within the same bandwidth and transmitted simultaneously in order to efficiently provide various services. In a communication system whose capacity is limited by such mutual interference, signals from other users within the same frequency are recognized as noise.

In a conventional CDMA system such as an IMT-2000 system, channel coding is performed using a convolutional code or the like for data error correction, and a PN code or Walsh is used to distinguish it from other users' data. After multi-access coding is performed using an orthogonal code, such as) code, data is transmitted as a signal using a signal modulation method using a phase difference of a signal such as binary phase-shift keying (BPSK) or quadrature phase-shift keying (QPSK). It was. However, since the above method also cannot transmit a plurality of signals for data transmission, it does not reduce the probability of occurrence of mutual interference, which is disadvantageous in securing the capacity of the communication system, and due to the excessive amount of transmission signals, There is a problem that power consumption.

According to the time-based encoding method disclosed in Korean Patent Laid-Open No. 2001-0068525 proposed to solve the above problem, the conventional method is used for transmitting the same amount of data since the difference in the transmission time point of the transmission signal is also used as data. Data transmission is also possible with fewer signal transmissions. Therefore, it is possible to increase system capacity and reduce transmission power in a CDMA communication system in which system capacity is limited by mutual interference.

With reference to an exemplary diagram of a coding method according to the conventional data transmission / reception method shown in FIG. 1A and an exemplary diagram of a coding method by the time-based data transmission / reception method shown in FIG. 1B, the prior art and Patent Publication No. 2001- The principle of the time-based encoding method shown in 0068526 is described as an example.

It is assumed that the duration of the time slot in FIG. 1A and the duration of the time slot in FIG. 1B are the same.

Figure 1a is an example using a conventional method using bpsk, which is a basic binary signal coding method in which the signal has only a value of "0" or "1". This example is a case of transmitting from a mobile terminal to a base station, and each terminal transmits 8 signals by transmitting 8 signals during a time period consisting of 8 time slots. In FIG. 1A, the terminal 1 transmits a value of binary “1000”, that is, “8” in decimal for the first unit data time. In FIG. 1A, the unit data is 4 bits, and the unit data time is composed of four time slots.

1B illustrates an example of applying a time-based encoding method to data signal coding.

In this case, the BPSK method is also used, and each terminal transmits one signal during a time period consisting of eight time slots, thereby transmitting four bits of information. At this time, the time is divided into eight time slots, each of the transmitted signal value and the signal is transmitted divided into time slots, each of the transmitted signal value and the time slot is transmitted is a combination of 4 bits (bit) ) Corresponds to one value that information can have.

Therefore, each terminal can transmit data by combining the transmitted signal and the number of the transmitted time slot by sending a specific signal to the time slot corresponding to the actual data value instead of the actual data. For example, the terminal 1 transmits the signal "1" to the "000" time slot to transmit the binary "1000" during the first unit data time. In the base station receiving this signal, it is possible to recover the information of the binary number "1000" by combining the signal of the binary number "1" and the time slot number "000" in which the signal was received.

In FIG. 1B, the unit data is also 4 bits, and the unit data time is composed of eight time slots. In this example, the data to be transmitted is simply separated and transmitted. However, only a part of the data to be transmitted is transmitted as a signal, and the rest of the data is not necessarily transmitted as time slot information. The combination only needs to be able to restore the original data.

As shown in the example of FIG. 1, in the conventional method, four signals have to be transmitted for transmission of 4 bits, but when using a time-based encoding method, only one signal is transmitted. . Thus, fewer signals are used to transmit the same amount of information, thereby reducing mutual interference in the system.

However, in order to increase the capacity of a communication system in which the capacity of the system is limited by mutual interference such as a CDMA system, an optimization method that can drastically reduce the number of transmission data is required.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems. By shortening the data transmission time using a run-length coding method, the system capacity can be increased in a communication system in which system capacity is limited by mutual interference. The purpose is to make sure.

The present invention also provides a computer-readable recording medium storing a program for increasing the capacity of a system in a communication system in which the system capacity is limited by mutual interference by shortening the data transmission time using a run-length coding method. The purpose is to provide.

1A and 1B are exemplary diagrams for explaining a data coding method in a conventional communication system.

2 is an exemplary diagram for explaining a data transmission method in a communication system using a two-channel run-length coding method according to an embodiment of the present invention.

3 is a block diagram of a data transmission apparatus in a communication system using a two-channel run-length coding method according to an embodiment of the present invention.

A data transmission method in a CDMA communication system using a two-channel run-length coding method according to a preferred embodiment of the present invention for achieving the above object,

A data transmission method in a communication system using a time-based encoding method,

A first step of checking the repetition number of data in unit data unit for the data to be transmitted;

A second step of generating information data representing data to be repeated from the data and repeating data representing the number of repetitions according to the verification result;

And a third process of transmitting the information data and the repetition count data through the two channels set in the unit data unit.

In addition, a recording medium storing a program for data transmission in a CDMA communication system using a two-channel run-length coding method according to a preferred embodiment of the present invention for achieving the above object,

A recording medium storing a data transmission method in a communication system using a time-based encoding method,

A first program for checking the repetition number of data in unit of data with respect to the data to be transmitted;

A second program for generating information data representing data to be repeated from the data and repetition frequency data representing a number of repetitions according to the checking result;

And a third program for transmitting the information data and the repetition count data through the two channels set in the unit data unit.

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

1 illustrates an example of a data transmission method in a CDMA communication system using a 2-channel run-length coding method according to an embodiment of the present invention. In the present invention, a synchronous time-based data transmission method is used. In the present invention, unlike the conventional asynchronous time-based data transmission method, two signals become one transmission unit.

In the CDMA communication system, a sequence of numbers combined with 0 and 1 is transmitted. Therefore, when a data string such as "010010010010010 011011011011011011011" is to be transmitted, the transmission data (010, 101) (011, 111) is actually transmitted. .

Figure 1 shows this example. This example assumes that only the ON-OFF signal is sent for easier understanding. In the synchronous time-based data transmission method, a method of transmitting data using a QPSK signal or a BPSK signal is also possible in the same manner as the ON-OFF signal transmission in this embodiment.

As shown in FIG. 1, channel 1 transmits data to be transmitted, and channel 2 transmits repetition frequency when data is repeated. When there is data only in channel 1 and no data is transmitted in channel 2 for a unit time, it operates in the same manner as a conventional synchronous time-based data transmission method using one channel, that is, channel 1. That is, the data of channel 1 is repeated once.

Referring to FIG. 1, when "010" is transmitted to channel 1 and "101" is transmitted to channel 2 during the first unit data time, the receiving side treats "010" as "101" times or five times. When "011" is transmitted to channel 1 and "111" is transmitted to channel 2 during the second unit data time, the receiving side treats "011" as "111" times, that is, seven times.

According to the above-described data transmission method, 12 signals may be transmitted in order to transmit the data string "010010010010010 011011011011011011011", but in the conventional data transmission method, 36 signals should be transmitted.

2 is a block diagram of a CDMA communication system to which a data transmission method using a two-channel run-length coding method according to an embodiment of the present invention is applied.

The transmitting side analyzes the input data using a two-channel run-length coding method and generates the information data to be transmitted to channel 1 and the repetition frequency data to be transmitted to channel 2. Signal modulation for modulating data transmitted from the multiple access encoding module 20 and the multiple access encoding module 20 so as to be transmitted to the receiving side in a wireless communication method. (Modulate) module 30, and a transmitter (40) for transmitting the data modulated by the signal modulation module 30 through the antenna (Transmitter) (40).

The receiving side has a structure corresponding to the above-described transmitting side, which is a receiver for receiving radio data transmitted from the transmitter 40 through an antenna, and a signal modulation for the radio data received by the receiver 50. A multimodal access decoding is performed on a signal demodulated by the signal demodulation module 60 and the signal demodulation module 60 by demodulating the radio data by performing a demodulation method corresponding to the modulation method applied by the module 30. Channel Decording, which performs 2-channel run-length decoding on the data output from the module 70 and the multi-access decoding module 70 to restore the data transmitted through the channel 1 and the channel 2 to the original data string. Module 80.

When the transmitting side receives the data transmission request, the channel encoding module 10 divides the input data into units of a specific bit (3 bits in the present invention), checks whether the data is repeated in the unit data unit, and then When the repetition is determined, information data to be transmitted to channel 1 and repetition frequency data to be transmitted to channel 2 are generated using a synchronous time-based encoding method.

The information data and the repetition frequency data are modulated by a multi-access coding and a specific method through the multi-access coding module 20 and the signal modulation module 30, and then the information data is transmitted to the channel 1 through the transmitter 40. The repetition data is transmitted on channel 2.

Accordingly, the receiving side receives the information data transmitted through the channel 1 and the repeated recovery data transmitted through the channel 2 through the receiving device 50, the signal demodulation module 60 and the multi-access decoding module 70 After the demodulation is performed in a specific manner, multi-access decoding is performed and then transmitted to the channel decoding module 80. The channel decoding module 80 decodes the information data transmitted through the channel 1 and the repetition count data transmitted through the channel 2 and restores the bit data.

As can be seen from the above description, the data to be transmitted are 36 signals as " 010010010010010 011011011011011011011 " Channel 1) and 111 (channel 2) to 12.

According to the present invention as described above, by using the two-channel Run-Length method in the CDMA communication system using a time-based data transmission method, by optimizing the transmitted signal to the system capacity by mutual interference, such as CDMA In this limited communication system, data can be efficiently transmitted to provide a high quality data service.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (4)

A data transmission method in a communication system using a time-based encoding method, A first step of checking the repetition number of data in unit data unit for the data to be transmitted; A second step of generating information data representing data to be repeated from the data and repeating data representing the number of repetitions according to the verification result; And a third process of transmitting the information data and the repetition count data through the two channels set in the unit data unit. 2. The method of claim 1, The second process is As a result of the determination in the first step, when repetition of predetermined data is confirmed in the unit data unit from the data, information data representing repeated data and repeating cycle data representing the repetition frequency are generated from the data. If the repetition of the predetermined data is not confirmed, only the information data is generated from the data, characterized in that for transmitting data in a communication system using a two-channel run-length coding method. The method of claim 2, The information data generated from the data is the same as the data when the repetition of the predetermined data is not confirmed in the unit of data in the data. The data transmission method of the communication system using the two-channel run-length coding method. A recording medium storing a data transmission method in a communication system using a time-based encoding method, A first program for checking the repetition number of data in unit of data with respect to the data to be transmitted; A second program for generating information data representing data to be repeated from the data and repetition frequency data representing a number of repetitions according to the checking result; And a third program for transmitting the information data and the repetition frequency data through the two channels set in the unit data unit, respectively.