KR20040085808A - Method of transmitting and receiving data based on time matrix modulation in wireless telecommunication system - Google Patents

Abstract

PURPOSE: A method for transceiving time-based data in a wireless communication system is provided to request a smaller number of signals to transmit the same amount of data by using a Lempel-Ziv method. CONSTITUTION: In a standby state of requesting a data transmission(401), a system checks whether data to be currently transmitted is previously defined at a data compression table(402). If not, the system transmits the data by using a time-based data transmission method after setting the first transmitted data to '0', and stores the corresponding data in the first empty space of the data compression table(404). If the data is defined at the data compression table, the system transmits the data by configuring the first transmitted data as an address of the data compression table, and transmits next data(403).

Description

Method of transmitting and receiving data based on time matrix modulation in wireless telecommunication system

The present invention relates to a time-based data transmission and reception method in a wireless communication system and a computer-readable recording medium recording a program for realizing the method, and more particularly, code division multiple access (CDMA). In a wireless communication system where capacity is limited by mutual interference such as a mobile communication system, the Lempel-Ziv coding / decoding method is used to maximize the capacity increase of the available system and to reduce power consumption for data transmission and reception. It is to be minimized.

In the present invention, the information stored in the address of the data compression table of the transmitter and the data recovery table of the receiver used for Lempel-Ziv coding / decoding are the same. Therefore, hereinafter, the Lempel-Ziv coding method will be mainly described.

In a CDMA-based mobile communication system, all users share frequency, multiple access methods are provided by transmission power, and each user is distinguished by different orthogonal codes. In other words, in the CDMA-based mobile communication system, data requiring different transmission speeds 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 wireless communication system whose capacity is limited by such mutual interference, signals from other users within the same frequency are recognized as noise.

In particular, in a CDMA mobile communication system such as an International Mobile Telecommunication (IMT-2000) next generation mobile communication system, channel coding is performed using a convolutional code or the like for data error correction, which is performed by another user's data. After performing multi-access coding with an orthogonal code such as PN (Pseudo Noise) code or Walsh code to distinguish it from the PSA, BinaryPhase-Shift Keying (BPSK) or Quadrature Phase-Shift Keying (QPSK) Data was transmitted as a signal using a signal modulation method using the phase difference of the signal. However, these encoding or modulation methods do not use information on the transmission time of the transmitted signal. However, if a coding method using a difference in transmission time point of a transmission signal is used, data transmission can be performed even with a smaller number of signal transmissions than the conventional method for the same amount of data transmission.

Therefore, by using a coding method using a difference in transmission time point of a transmission signal, CDMA shift in which system capacity is limited by mutual interference by allowing data to be transmitted with fewer signal transmissions than the conventional method for the same amount of data transmission. It is possible to increase the capacity of the system in the communication system. In this case, however, the number of signals used for data transmission is reduced, but no further optimization is performed.

Therefore, using the Lempel-Ziv coding method, the number of signals required for the same amount of data transmission is further reduced to enable data transmission in a shorter time than the conventional time-based coding method, thereby reducing system capacity by mutual interference. In this limited communication system, there is an urgent need for a method of minimizing the power consumed for data transmission along with increasing system capacity.

The present invention has been proposed to meet the above requirements, and increases the capacity of a system that can be used using the Lempel-Ziv coding / decoding method in a wireless communication system whose capacity is limited by mutual interference such as a CDMA mobile communication system. It is an object of the present invention to provide a time-based data transmission and reception method for maximizing and minimizing power consumed for data transmission and reception, and a computer-readable recording medium recording a program for realizing the method.

1 is an exemplary configuration of a wireless communication system for transmitting and receiving data to which the present invention is applied.

2 is an explanatory diagram illustrating asynchronous time-based data transmission method according to an embodiment of the present invention.

3 is an explanatory diagram showing compression gain in transmission according to an embodiment of the present invention;

4 is a flowchart of an embodiment of a data transmission method according to the present invention;

5 is a flowchart of an embodiment of a data receiving method according to the present invention;

In order to achieve the above object, the present invention provides a time-based data transmission method using two signals as one transmission unit at a transmitting side of a wireless communication system, and checking whether data to be transmitted is currently defined in a data compression table. A first step of making; According to the check result of the first step, if the data to be transmitted is not defined in the data compression table, the first transmission signal is defined as "no reference address" ("0") to use a time-based data transmission method. A second step of transmitting the next data to be transmitted using a time-based data transmission method and then storing the data in a first empty space of the data compression table; And if the data to be transmitted is defined in the data compression table according to the check result of the first step, using a time-based data transmission method using the first signal to be transmitted as the address of the data compression table. And a third step of transmitting the next data to be transmitted using a time-based data transmission method.

In addition, the present invention provides a time-based data reception method using two signals as one reception unit at a receiving side of a wireless communication system, comprising: a first step of confirming whether a first signal of received data indicates a reference address; ; If the first signal received is defined as "no reference address" according to the check result of the first step, restoring the second signal received and storing the data in the first empty space of the data recovery table. Two steps; And according to the check result of the first step, if the first signal received is defined as "with a reference address", the second signal received by reading the data stored in the address of the data release table that the first signal received means. And a third step of restoring the original data by adding a signal to the data.

On the other hand, the present invention is to check whether the data to be transmitted currently defined in the data compression table to the transmitting side of the wireless communication system having a processor for the time-based data transmission using two signals as one transmission unit First function; According to the test result of the first function, if the data to be transmitted is not defined in the data compression table, the first transmission signal is defined as "no reference address" ("0") to use a time-based data transmission method. A second function of transmitting data to be transmitted next, using a time-based data transmission method, and storing the data in a first empty space of the data compression table; And if data to be transmitted is defined in the data compression table according to a check result of the first function, transmit the first signal to be transmitted using a time-based data transmission method as an address of the data compression table. A computer-readable recording medium having recorded thereon a program for realizing a third function of transmitting data to be transmitted next using a time-based data transmission method is provided.

In addition, in the present invention, in order to receive time-based data using two signals as one reception unit, a reception side of a wireless communication system having a processor checks whether a first signal of received data indicates a reference address. A first function of doing; If the first signal received is defined as "no reference address" according to the check result of the first function, restoring the second signal received and storing the data in the first empty space of the data recovery table. 2 functions; And according to the check result of the first step, if the first signal received is defined as "with a reference address", the second signal received by reading the data stored in the address of the data release table that the first signal received means. A computer readable recording medium having recorded thereon a program for realizing a third function of adding a signal to the data and restoring original data is provided.

The present invention transmits a signal to a specific time slot according to time slot information using the Lempel-Ziv method for data to be transmitted at the transmitting side, and combines the signal received at the receiving side with the time slot information at which the signal is received. By restoring data, it is possible to transfer data at a faster time, especially with fewer signals, increasing system capacity and minimizing the power consumed for data transmission.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration of a wireless communication system for data transmission and reception according to the present invention.

When data is transmitted from the transmitter, data compressed by the data compression module is subjected to channel encoding, multiple access encoding, and signal modulation to transmit time-based data in a transmitter. Is transmitted over the radio section.

On the other hand, when data is received at the receiving side, the data received by the receiving module through the radio section is received by the data recovery module through signal demodulation, multiple access decoding, and channel decoding. Is restored.

2 is an explanatory diagram illustrating asynchronous time-based data transmission method according to an embodiment of the present invention, and illustrates a time-based data transmission process using the Lempel-Ziv method in a wireless section.

In FIG. 2, an asynchronous time-based data transmission process is exemplified, but the present invention is not limited thereto, and it may be applicable to a synchronous time-based data transmission process. However, in the present invention, unlike the asynchronous time-based data transmission process, two signals become one transmission unit.

Since the CDMA mobile communication system transmits a combination of numbers of "0" and "1", for example, when transmitting a symbol of "0 1 00 001 0011 11 111 00110", the transmission data, address, and stored number string are The following [Table 1].

symbol 0 1 00 001 0011 11 111 00110 Transmission data (0,0) (0,1) (1,0) (3,1) (4,1) (2,1) (6,1) (5,0) address 1 2 3 4 5 6 7 8 Stored numeric string 0 1 00 001 0011 11 111 00110

In FIG. 2, only four pieces of transmission data are shown in Table 1 above. It is assumed here that only the ON-OFF signal is sent for better understanding. Therefore, sending a QPSK or BPSK signal is possible in the same manner as in the existing asynchronous time-based data transmission process.

However, in the conventional asynchronous time-based data transmission process, the transmission data should be transmitted using 20 signals. However, in the present invention, the same data transmission is possible using only 16 signals. Therefore, the greater the amount of data to be sent, the higher the compression efficiency. Therefore, the effect of the present invention can be very large for a communication system that continuously transmits data.

In FIG. 2, for example, the terminal 1 transmits a "0" signal to a "000" time slot and a next "000" time slot to transmit a binary "0" during the first unit data time.

And, the meaning of the transmission data (0,0) means that "0" is not stored in the existing address, and that data "0" to be transmitted is stored in the address 1. As a result, data "0" is transmitted, and "0" is stored in address 1 at the transmitting side (data compression table) and the receiving side (data decompression table).

Then "1" is likewise transmitted and stored at address 2. That is, the meaning of the transmission data (0, 1) means that "0" is not stored in the existing address, and that the data "1" to be transmitted is stored in the address 2.

The third signal (1,0) means data stored at address 1, that is, "0" and new data (data to be transmitted) "0". At this time, the transmitted data becomes "00" and this data ("00"). ") Is stored at address 3.

The fourth signal (3,1) means data stored at address 3, that is, "00" and new data (data to be transmitted) "1", where the transmitted data is "001" and this data ("001"). ") Is stored at address 4.

The fifth signal (4,1) means data stored at address 4, that is, "001" and new data (data to be transmitted) "1", where the transmitted data becomes "0011" and this data ("0011"). ") Is stored at address 5.

The sixth signal (2,1) means data stored at address 2, that is, "1" and new data (data to be transmitted) "1", where the transmitted data is "11" and this data ("11"). ") Is stored at address 6.

The seventh signal (6,1) means data stored at address 6, that is, "11" and new data (data to be transmitted) "1", where the transmitted data becomes "111" and this data ("111"). ") Is stored at address 7.

The eighth signal (5,0) means data stored at address 5, that is, "0011" and new data (data to be transmitted) "0", where the transmitted data becomes "00110" and this data ("00110"). ") Is stored at address 8.

In this way, data is compressed without prior information about the data to be transmitted.

In this case, the gain is only 20% (= 16/20), but if the amount of data increases, the gain can be significant.

Compression gain in transmission according to an embodiment of the present invention is shown in FIG.

In Fig. 3, the compression gain is defined as (amount of original data)-(amount of data actually transmitted). As shown in FIG. 3, the compression gain does not increase well at first but increases linearly thereafter. However, if we assume that the transmission probabilities of " 0 " and " 1 " are the same, the compression gain will actually increase to a log scale, which will be even larger.

4 is a flowchart illustrating a data transmission method according to an embodiment of the present invention, and illustrates a data transmission procedure at a transmission side. Here, the first data (signal) and the second data (signal) become one transmission unit.

First, in the data transmission request waiting state (401), it is checked whether the data to be transmitted currently is already defined in the data compression table (402).

If the data to be transmitted is not defined in the data compression table, the first data to be transmitted is set to "0" and then transmitted using a time-based data transmission method. To send. The data is then stored in the first empty space of the data compression table (404). That is, if the data to be transmitted is (0,0), it is not stored in the existing address. Therefore, the data "0" to be transmitted is stored in the address 1, and if the data to be transmitted is (0,1), it is also not stored in the existing address. Therefore, store the data "1" to be transmitted in address 2.

If the data to be transmitted is defined in the data compression table, the data to be transmitted is transmitted using the time-based data transmission method using the first data to be the address of the data compression table, and then the data to be transmitted is subsequently transferred. A method is used to transmit (403).

That is, when the data to be transmitted is (1,0), the data "0" stored in the address 1 is transmitted, and the new data "0" is subsequently transmitted. Therefore, the transmitted data is "00". In addition, when the data to be transmitted is (3,1), "00" stored in the address 3 is transmitted, and new data "1" is subsequently transmitted. Therefore, the transmitted data is "001".

Similarly, when the data to be transmitted is (4,1), "001" stored at address 4 is transmitted, and new data "1" is subsequently transmitted, so that the data transmitted at this time becomes "0011". In addition, when the data to be transmitted is (2,1), "1" stored in the address 2 is transmitted, and new data "1" is subsequently transmitted, so that the data transmitted at this time is "11". In addition, when the data to be transmitted is (6, 1), "11" stored in the address 6 is transmitted, and new data "1" is subsequently transmitted, so that the data transmitted at this time becomes "111". In addition, when the data to be transmitted is (5,0), "0011" stored in the address 5 is transmitted, and new data "0" is subsequently transmitted, so that the transmitted data is "00110".

5 is a flowchart illustrating a data receiving method according to an embodiment of the present invention, and shows a data receiving procedure at a receiving side. Here, the first data (signal) and the second data (signal) become one reception unit.

First, in a reception waiting state 501, a received signal is restored using a time-based reception method (502). At this time, it is checked whether the first signal received is "0" (503).

As a result of the check, if the first signal received is "0", since it is not stored in the existing address, the received second signal is restored and the data is stored in the first empty space of the data recovery table (504).

That is, if the received data is (0,0), since the first received signal is "0", it is not stored in the existing address, so that the second received signal is restored (restored, the received data is "0"). "), This data" 0 "is stored in address 1 of the data recovery table. In addition, when the received data is (0,1), since the first received signal is "0", it is not stored in the existing address, so that the second received signal is restored (restored, the received data is "1"). &Quot; " stores this data " 1 " in address 2 of the data recovery table.

If the first signal received is not "0", it is stored in the existing address, so go to the data recovery table corresponding to the first signal received, read the data, and append the second received signal to the data. The original data is restored (505).

That is, if the received data is (1,0), since the first received signal is "1", it is stored in the existing address, so the data ("0") stored in the corresponding address1 of the data restoration table is read. In addition, the received second signal "0" is added to the data "0" stored in the address 1 to restore the original data "00".

In addition, when the received data is (3,1), since the first received signal is "3", it is stored in the existing address, so the data ("00") stored in the corresponding address 3 of the data recovery table is read. Then, the received second signal " 1 " is added to the data " 00 " stored at address 3 to restore the original data " 001 ".

In addition, when the received data is (4,1), since the first received signal is "4", it is stored in the existing address, so the data ("001") stored in the corresponding address 4 of the data recovery table is read. In addition, the received second signal " 1 " is added to the data " 001 " stored at address 4 to restore the original data " 0011 ".

In addition, if the received data is (2,1), since the first received signal is "2", it is stored in the existing address, so the data ("1") stored in the corresponding address 2 of the data recovery table is read. Then, the received second signal " 1 " is added to the data " 1 " stored at address 2 to restore the original data " 11 ".

In addition, when the received data is (6,1), since the first received signal is "6", it is stored in the existing address, so the data ("11") stored in the corresponding address 6 of the data recovery table is read. Then, the received second signal " 1 " is added to the data " 11 " stored at address 6 to restore the original data " 111 ".

In addition, when the received data is (5,0), since the first received signal is "5", it is stored in the existing address, so after reading the data ("0011") stored in the corresponding address 5 of the data restoration table. Then, the received second signal " 0 " is added to the data " 0011 " stored at address 5 to restore the original data " 00110 ".

In the above, the information stored in the address of the data compression table of a sending side and the data decompression table of a receiving side is the same.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

The present invention as described above, in the CDMA mobile communication system using a time-based data transmission method, such as using the Lempel-Ziv method requires only less signal than the conventional method for the same amount of data transfer, such as CDMA In a wireless communication system in which system capacity is limited by interference, data capacity of a larger capacity can be provided, thereby maximizing system capacity and minimizing power consumption for data transmission and reception.

Claims (6)

In the time-based data transmission method of transmitting two signals in one transmission unit in a wireless communication system, A first step of checking whether data to be transmitted currently is defined in a data compression table; According to the check result of the first step, if the data to be transmitted is not defined in the data compression table, the first transmission signal is defined as "no reference address" ("0") to use a time-based data transmission method. A second step of transmitting the next data to be transmitted using a time-based data transmission method and then storing the data in a first empty space of the data compression table; And According to the check result of the first step, if the data to be transmitted is defined in the data compression table, the first transmission signal is transmitted using a time-based data transmission method using the address of the data compression table, and then Third step of transmitting data to be transmitted using a time-based data transmission method Time-based data transmission method in a wireless communication system comprising a. The method of claim 1, The time-based data transmission method, Preferably, the time-based data transmission method in a wireless communication system, characterized in that the asynchronous time-based data transmission method using the Lempel-Ziv method. In the receiving method of the wireless communication system in the time-based data receiving method using two signals as one reception unit, A first step of confirming whether a first signal of the received data indicates a reference address; If the first signal received is defined as "no reference address" according to the check result of the first step, restoring the second signal received and storing the data in the first empty space of the data recovery table. Two steps; And According to the check result of the first step, if the first signal received is defined as "with a reference address", the second signal received by reading the data stored in the address of the data release table means the first signal received The third step to restore the original data by adding it to the data Time-based data reception method in a wireless communication system comprising a. The method of claim 3, wherein The data release table, A time-based data reception method in a wireless communication system, characterized in that the same as the data compression table of the transmitting side. For a time-based data transmission using two signals as one transmission unit, at a transmitting side of a wireless communication system having a processor, A first function of checking whether data to be transmitted currently is defined in a data compression table; According to the test result of the first function, if the data to be transmitted is not defined in the data compression table, the first transmission signal is defined as "no reference address" ("0") to use a time-based data transmission method. A second function of transmitting data to be transmitted next, using a time-based data transmission method, and storing the data in a first empty space of the data compression table; And According to the check result of the first function, if the data to be transmitted is defined in the data compression table, the first transmission signal is transmitted using a time-based data transmission method using the address of the data compression table, and then Third function for transmitting the data to be transmitted using a time-based data transmission method A computer-readable recording medium having recorded thereon a program for realizing this. On the receiving side of the wireless communication system having a processor for time-based data reception using two signals as one reception unit, A first function of confirming whether a first signal of received data indicates a reference address; If the first signal received is defined as "no reference address" according to the check result of the first function, restoring the second signal received and storing the data in the first empty space of the data recovery table. 2 functions; And According to the check result of the first step, if the first signal received is defined as "with a reference address", the second signal received by reading the data stored in the address of the data release table means the first signal received Function to restore the original data by appending to the data A computer-readable recording medium having recorded thereon a program for realizing this.