KR100887506B1 - Efficient Time Matrix Modulation for CDMA communication systems - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a time-based data transmission method for data transmission in a CDMA system.

2. The technical problem to be solved by the invention

According to the present invention, data is transmitted using a time slot not used in the conventional synchronous time-based data transmission method, thereby further reducing the time required for the same amount of data transmission. To provide a time-based data transmission method for data transmission and a computer-readable recording medium recording a program for realizing the method in a CDMA system that enables data transmission within a shorter time by enabling data transmission in a short time. For that purpose.

3. Summary of the Solution of the Invention

In the time-based data transmission method, according to a data transmission request from a user, the data to be transmitted is actually divided into data to be transmitted and time slot information, and then encryption, encoding, and Performing a modulation function to bind the processed unit data and the time slot information to generate a data packet; A second step of separating the generated data packet into unit data and time slot information and transmitting the unit data in a corresponding time slot; A third step of checking whether a time slot information value of a next data packet exceeds a time slot information value of the data packet; A fourth step of transmitting the unit data in the corresponding time slot within the corresponding unit time if the check result is exceeded; And a fifth step of transmitting the unit data in the corresponding time slot of the next unit time, if not exceeded.

4. Important uses of the invention

The present invention is used for CDMA communication and the like.

CDMA, coding, data compression, TMM, time-based data transfer

Description

Time-based data transmission method for data transmission in code division multiple access communication system {Efficient Time Matrix Modulation for CDMA communication systems}             

1 is a block diagram of an embodiment of a time-based encoding and decoding apparatus for data transmission in a CDMA system according to the present invention.

2 is a structural diagram of an embodiment of data transmission by a time-based data transmission method for data transmission in a CDMA system according to the present invention;

3 is a flowchart illustrating an embodiment of a time-based data transmission method for data transmission in a CDMA system according to the present invention.

* Explanation of symbols on the main parts of the drawing

11: transmitting side communication system 111: data separation module

112: channel encoding module 113: multi-access encoding module

114: signal modulation module 115: transmission device

12: receiving side communication system 121: data recovery module

122: channel decoding module 123: multiple access decoding module

124: signal demodulation module 125: receiver

The present invention relates to a time-based data transmission method for data transmission in a CDMA system and a computer-readable recording medium having recorded thereon a program for realizing the method.

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 (Pseudo Noise) code for distinguishing it from other users' data. Alternatively, after performing multi-access coding with an orthogonal code such as Walsh code, data 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) is used. Signaled. However, these conventional coding or modulation methods do not use information on the transmission time of the transmitted signal.

In order to solve this problem, by using a coding method that uses the difference in the transmission time of the transmission signal, the system can be transmitted by mutual interference by enabling data transmission with less signal transmission than the conventional method for the same amount of data transmission. In a CDMA communication system with limited capacity, it is possible to increase the capacity of the system. In this case, the number of signals used for data transmission was reduced but no further optimization was made.

The present invention has been proposed to solve the above problems, and transmits data using a time slot that is not used in the conventional synchronous time-based data transmission method. Further, to realize the time-based data transmission method and the method for data transmission in a CDMA system that enables data transmission in a shorter time by enabling data transmission in a shorter time than conventional time-based encoding method Its purpose is to provide a computer readable recording medium having recorded thereon a program.

According to the present invention for achieving the above object, in the time-based data transmission method, according to a data transmission request from the user, the data to be transmitted is actually divided into data to be transmitted and time slot information, and then transmitted to the actual data to be transmitted. A first step of generating a data packet by combining the processed unit data and the time slot information by performing an encryption, encoding, and modulation function necessary for a; A second step of separating the generated data packet into unit data and time slot information and transmitting the unit data in a corresponding time slot; A third step of checking whether a time slot information value of a next data packet exceeds a time slot information value of the data packet; A fourth step of transmitting the unit data in the corresponding time slot within the corresponding unit time if the check result is exceeded; And a fifth step of transmitting the unit data in the corresponding time slot of the next unit time, if not exceeded.

In addition, the present invention, according to a data transmission request from the user, the data transmission system having a processor, after separating the data to be transmitted to the data and time slot information to be actually transmitted, the encryption required for transmission for the actual data to be transmitted, A first function of performing a coding and modulation function to bind the processed unit data and the time slot information to generate a data packet; A second function of dividing the generated data packet into unit data and time slot information and transmitting the unit data in a corresponding time slot; A third function of checking whether a time slot information value of a next data packet exceeds a time slot information value of the data packet; A fourth function of transmitting the unit data in the corresponding time slot within the corresponding unit time if the check result is exceeded; And a computer-readable recording medium having recorded thereon a program for realizing a fifth function for transmitting unit data in the corresponding time slot of the next unit time, if not exceeded.

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

1 is a block diagram of an embodiment of a time-based encoding and decoding apparatus for data transmission in a CDMA system according to the present invention.

As shown in FIG. 1, the time-based encoding and decoding apparatus for data transmission according to the present invention includes a transmitter 11 and a receiver 12.

First, the transmitter 11 of the encoding apparatus includes a data separation module 111 for separating original data into data to be transmitted and time slot information, a channel encoding module 112 for error correction and inspection, A multiple access encoding module 113, a signal modulation module 114, and a transmitter 115 for distinguishing between different channels are provided.

Next, the receiver 12 of the decoding apparatus includes a receiver 121, a signal demodulation module 122, a multiple access decoding module 123, and a channel decoding. decoding module 124 and a data recovery module 125 for recovering the original data separated by the data separation module 111 of the transmission-side communication system 11.

Now, operations of a time-based encoding and decoding apparatus for data transmission according to the present invention having the above-described structure will be described in detail as follows.

When the transmission unit 11 receives a data transmission request from the user, the data separation module 111 divides the data to be transmitted by dividing the data into unit data units, that is, β bits, into one data packet by actually transmitting data and time slot information. It makes a transmission to the channel encoding module 112. In other words, when the amount of data that can be a modulation method of the system to send to the one of the signal lines K-bit (bit), the rest actually transmits only particular K-bit in the data of β bits, except for the data β - K bit (bit ) Data is transmitted to the channel encoding module 112, which is the next step, in a single packet together with the data to be transmitted as time slot information instead of the actual transmission. For example, in the case of using the BPSK in the case of using a QPSK only a specific one bit in the bit data β, is actually transmitted only certain β 2 bits in the bit data and the other data is a time slot information.

The channel encoding module 112 performs channel encoding on only the data portion of the received data packet to be actually transmitted by using a convolutional code or another channel encoding method, and retains the time slot information received along with the encoded data. Bundled into one packet and transmitted to the multi-access coding module 113.

Such data separation and channel encoding may be performed by one module, by a program written in software, or by configuring a dedicated electronic circuit device to reduce processing time. An example of a configuration of the dedicated electronic circuit, loading the data constituting the series and β-bit parallel input and output possible shift register (shift register) for receiving data having a length of β bits and sent to the register using a parallel input circuit After loading, a shift operation is performed to extract only the leftmost (or right) K bits, and after encoding using a conventional channel encoding circuit, only one uncoded β - K bit of data The packet is bundled into packets and transmitted to the multi-access coding module 113.

The multi-access encoding module 113 encodes only the encoded data portion of the received data packet using PN (Pseudo random) code or Walsh code, and retains the time slot information received together with the multi-access encoded data. The packet is transmitted to the signal modulation module 114 as.

The signal modulation module 114 modulates only the encoded data portion of the received packet using BPSK, QPSK, or other modulation method, and bundles the modulated signal into one packet together with the received time slot information. To send.

Then, the transmitter 115 transmits only the modulated data portion of the received packet through the wireless transmission medium according to time slot information of the same packet.

On the other hand, the receiving unit 12 transmits the signal received by the receiving apparatus 121 and the slot number corresponding to the received time of the received signal as the time slot information, bundles it into one packet, and transmits it to the signal demodulation module 122, and the signal The demodulation module 122 demodulates the received signal and bundles the demodulated data and the received time slot information into one packet and transmits the demodulated data to the multi-access decoding module 123. The multiple access decoding module 123 decodes the received signal and transmits the decoded data and the received time slot information into one packet to the channel decoding module 124. The channel decoding module 124 decodes the signal and bundles the decoded data and the received time slot information into one packet and transmits the decoded data to the data recovery module 125. The data restoration module 125 restores the original data in the reverse order of the data separation method in the data separation module 11 of the transmitting communication system 11 based on the decoded data and the received time slot information.

2 is a structural diagram of an embodiment of data transmission by a time-based data transmission method for data transmission in a CDMA system according to the present invention.

2 illustrates an example of a principle of a data transmission method in a wireless section according to the present invention. In the present invention, a synchronous time-based data transmission method is used. In the present invention, a faster data transmission is possible by sending a signal to a data slot not used in the conventional synchronous time-based data transmission method.

2 shows this example. This example assumes that only the ON-OFF signal is sent for easier understanding. Therefore, sending a QPSK or BPSK signal is also possible in the same way as in the conventional synchronous time-based method.

As shown in FIG. 2, one unit time is divided into eight time slots, and three bits of data are assigned to each time slot.

As shown in the example shown in FIG. 2, in channel 1, two signals are transmitted in time slots "010" and "110" during the first unit time, and data "010110" is transmitted, and four signals are transmitted during the second unit time. Signals were transmitted in time slots "001", "011", "100", and "111" to transmit data of "001011100111" for one unit time.

In other words, by using such a method, it is possible to transfer data from as little as 3 bits to as much as 24 bits in one unit time.

3 is a flowchart illustrating an embodiment of a time-based data transmission method for data transmission in a CDMA system according to the present invention.

As shown in FIG. 3, the data to be transmitted is actually separated into data to be transmitted and time slot information (301, 302), and processing such as encryption, encoding, and modulation necessary for transmission (303, 304, 305) is performed on the actual data to be transmitted (303, 304, 305). And transmitting the data processed in step 303, 304, and 305 to the receiver in the designated time slot according to the time slot information.

In more detail, when there is no data to be transmitted, the transmitter waits for a data transmission request (301). When receiving a data transmission request, the data separation module separates the data to be transmitted as the unit data unit into actual data and time slot information in the same manner as described with reference to FIG. (302).

Subsequently, when the channel encoding module separates only the actual data to be transmitted from the received packet and performs channel encoding, the channel encoding module bundles the data together with the time slot information of the received packet and transmits the result to the multi-access encoding module (303). The multi-access coding method separates only the channel-coded data from the received data packet and transmits the received data packet to the signal modulation module by binding the packet together with time slot information of the received packet.

Then, the signal modulation module separates and modulates only the multi-access coded data portion from the received packet, and transmits the received data to the transmission apparatus by binding the packet together with time slot information of the received packet (305).

The transmitting device separates the received data packet into modulated data and time slot information, stores the time slot information value in a time slot information variable, and waits for a synchronization signal from the base station (306).

The transmission device first transmits a modulated signal using unit time (3 bits in FIG. 2) using the corresponding time slot (307).

In operation 308, it is determined whether the next unit data is larger than the previous unit data, and when the value is larger, the data is transmitted by transmitting a signal to a time slot corresponding to the same unit data time (309). It waits until the unit data time starts (310) and transmits a signal to the time slot corresponding to the next unit data time (307). This process is repeated until the end of the same unit data time (307 ~ 310).
Hereinafter, the processes "307" to "310" will be described in more detail.
First, the transmission device transmits the modulated data using the corresponding time slot.
Thereafter, it is determined whether the time slot information value of the next data packet exceeds the time slot information value of the previous data packet, and when exceeded, the unit data is transmitted in the corresponding time slot within the same unit time, and when the next unit time is started, Wait until, and transmit unit data in corresponding time slot within next unit time. All the above steps are repeated for all data packets.

Instead of processing only one signal per unit data time, the receiver recovers data according to the corresponding time slot whenever a signal arrives.

In this example, the conventional method should have transmitted the above transmission data for six unit times, but the same data transmission is possible for two unit times using the present invention.                     

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

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited by the drawings.

The present invention as described above, in the CDMA communication system using a time-based data transmission method by requiring less time than the conventional method for the same amount of data transmission to provide a faster data service than the conventional method There is.

Claims (5)

In the time-based data transmission method, In response to a data transmission request from a user, the data to be transmitted is divided into data to be transmitted and time slot information, and then the unit data and the time slot processed by performing encryption, encoding, and modulation functions necessary for transmission are performed on the data to be actually transmitted. A first step of binding information to generate a data packet; A second step of separating the generated data packet into unit data and time slot information and transmitting the unit data in a corresponding time slot; A third step of checking whether a time slot information value of a next data packet exceeds a time slot information value of the data packet; A fourth step of transmitting the unit data in the corresponding time slot within the corresponding unit time if the check result is exceeded; And A fifth step of transmitting the unit data in the corresponding time slot of the next unit time if it is not exceeded as a result of the checking; Time-based data transmission method for data transmission in a CDMA system comprising a. The method of claim 1, A sixth step of repeating the steps of the first to fifth steps until the last data packet; Time-based data transmission method for data transmission in the CDMA system further comprising. The method according to claim 1 or 2, The time slot information value is, A time-based data transmission method for data transmission in a CDMA system in which the unit time is divided into a predetermined number to have a data value in each divided part. The method of claim 3, wherein The data value is a time-based data transmission method for data transmission in a 3-bit CDMA system. In a data transmission system having a processor, In response to a data transmission request from a user, the data to be transmitted is divided into data to be transmitted and time slot information, and then the unit data and the time slot processed by performing encryption, encoding, and modulation functions necessary for transmission are performed on the data to be actually transmitted. A first function of binding information to generate a data packet; A second function of dividing the generated data packet into unit data and time slot information and transmitting the unit data in a corresponding time slot; A third function of checking whether a time slot information value of a next data packet exceeds a time slot information value of the data packet; A fourth function of transmitting the unit data in the corresponding time slot within the corresponding unit time if the check result is exceeded; And A fifth function of transmitting the unit data in the corresponding time slot of the next unit time if not exceeded as a result of the checking A computer-readable recording medium having recorded thereon a program for realizing this.

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