KR20040072072A - Wireless data transmitting/receiving apparatus and transmitting/receiving method - Google Patents

Abstract

PURPOSE: An apparatus for transmitting and receiving wireless data, and a method for transmitting and receiving wireless data are provided to widen a transmission band width, and realize data transmission and receipt adaptive to a peripheral communication environment. CONSTITUTION: A media access control unit(300) judges wireless communication conditions for deciding one of reference frequencies as a transmitting frequency. A baseband unit(500) receives data from the media access control unit(300) for executing modulation corresponding to the decided transmitting frequency for outputting data stream. A communication unit(400) loads the output data stream on one carrier having the transmitting frequency.

Description

Wireless data transmitting / receiving apparatus and transmitting / receiving method {Wireless data transmitting / receiving apparatus and transmitting / receiving method}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless data transmission / reception apparatus and a transmission / reception method, and more particularly, to a wireless data transmission / reception apparatus and a transmission / reception method enabling wireless data transmission and reception adaptive to a surrounding communication environment.

One wireless data transceiver is a wireless LAN card. The wireless LAN card is installed in a notebook computer or the like to connect to a network to enable wireless Internet.

Various standards have been enacted for WLAN cards or new standards are being created. For example, the IEEE 802.11a standard has a transmission bandwidth of 54 MBps, uses a frequency of 5 GHz, the IEEE 802.11b standard has a transmission bandwidth of 11 MBps, uses a frequency of 2.4 GHz, and the IEEE 802.11g standard uses a 54 MBps transmission bandwidth. And use a frequency of 2.4 GHz.

In addition to these 802.11a, 802.11b and 802.11g standards, there are IEEE 802.11a / b combo cards. The 802.11a / b combo card supports two standards, 802.11a and 802.11b. The 802.11a / b combo card allows the 802.11a and 802.11b frequency bands to operate in two modes, focusing on the different 5GHz and 2.4GHz bands, respectively.

However, 802.11a / b combo cards only transmit or receive data on one frequency, but not both at the same time. That is, the 802.11a / b combo card has a configuration for 802.11a and 802.11b, respectively, and one of the modes of 802.11a and 802.11b is selected and operated by switching.

Therefore, the conventional combo WLAN card operates in only one mode and the resources of the remaining modes that are already prepared are not used, resulting in waste of resources. In the case of the transmission bandwidth, only the transmission bandwidth that can be obtained in any one mode can be obtained, which does not take advantage of the combo type. In addition, the conventional combo WLAN card does not provide an adaptive data transmission / reception function for transmitting and receiving data in a mode using a frequency in which communication conditions are favorable in consideration of a surrounding communication environment.

The technical problem to be solved by the present invention is to provide at least two modes of performing data transmission using different frequency bands to provide a wider transmission bandwidth and to adapt to a wireless communication environment. The present invention provides a wireless data transmission apparatus and a transmission method that enable data transmission.

Another technical problem to be solved by the present invention is to support at least two or more modes of receiving and processing at least two or more carriers transmitted using different frequency bands, thereby enabling more data processing, and receiving conventional combo-type wireless data. The present invention provides a wireless data receiving apparatus and a receiving method which can be implemented at a lower cost than the apparatus.

1 is a schematic diagram of a wireless data transmission and reception apparatus according to the present invention;

2 is a view for explaining an embodiment of a wireless data transmission and reception apparatus according to the present invention;

3 is a view for explaining an embodiment of the baseband unit shown in FIG.

4 is a view for explaining another embodiment of the baseband unit shown in FIG.

5 is a view for explaining another embodiment of a wireless data transmission and reception apparatus according to the present invention;

6 is a view for explaining an embodiment of the baseband unit shown in FIG. 5;

7 is a view for explaining another embodiment of the baseband unit shown in FIG. 5;

8 is a view for explaining the detailed configuration of the PS / SP converter shown in FIG.

9 is a flowchart for explaining a wireless data transmission method according to the present invention;

10 is a flowchart for explaining an embodiment of a detailed configuration of step 810 illustrated in FIG. 9;

11 is a flowchart for explaining an embodiment of a detailed configuration of step 830 of FIG. 9;

12 is a flowchart for explaining an embodiment of a detailed configuration of step 850 shown in FIG. 9;

13 is a flowchart illustrating a method of receiving wireless data according to the present invention.

In order to achieve the above object, the wireless data transmission apparatus according to the present invention,

A wireless data transmission apparatus for wirelessly transmitting data on a carrier having at least two different reference frequencies, the wireless data transmission apparatus comprising: a medium access control unit determining at least one of the reference frequencies as a transmission frequency by determining a wireless communication condition; A baseband unit which receives data from the medium access control unit and outputs a data stream by performing at least one type of modulation corresponding to the transmission frequency determined by the medium access control unit, respectively; And a communication unit configured to transmit the data stream output from the baseband unit to at least one carrier having the at least one transmission frequency.

In addition, the medium access control unit determines the at least one transmission frequency by determining the radio communication conditions for each reference frequency according to the information indicating the radio communication conditions for each reference frequency input from the baseband unit, and inputs from the baseband unit Preferably, the information indicating the radio communication condition for each reference frequency is the strength of the received signal for each reference frequency.

In order to achieve the above object, the wireless data transmission method according to the present invention,

A wireless data transmission method for wirelessly transmitting data on a carrier having at least two different reference frequencies, the method comprising: (a) determining at least one of the reference frequencies as a transmission frequency by determining a wireless communication condition; (b) generating a data stream by performing at least one type of modulation corresponding to each of the transmission frequencies determined in step (a); And (c) transmitting the data stream generated in step (b) on at least one carrier having the at least one transmission frequency.

In the step (a), it is preferable to determine the at least one transmission frequency by determining a wireless communication condition for each reference frequency according to the strength of the received signal for each reference frequency.

In order to achieve the above another object, the wireless data receiving apparatus according to the present invention,

A wireless data receiving apparatus for simultaneously receiving and processing data having at least two different reference frequencies, the wireless data receiving apparatus comprising: simultaneously receiving carriers having at least two different reference frequencies, extracting analog data signals carried on each carrier, A communication unit for mixing the analog data signals in a predetermined manner and converting the analog data signals into digital signals to output one serial digital stream; A baseband unit which receives the serial digital stream from the communication unit, generates at least two digital streams by separating the serial digital streams by the inverse method of the predetermined mixed method, and demodulates and outputs the respective digital streams by a predetermined method; And a medium access control unit which receives the demodulated signal from the baseband unit and transmits the demodulated signal to the host interface.

In order to achieve the above another problem, the wireless data receiving method according to the present invention,

A wireless data receiving method for simultaneously receiving and processing data having at least two different reference frequencies, the wireless data receiving method comprising: (a) simultaneously receiving a carrier having at least two different reference frequencies and receiving analog data signals carried on each carrier; Extracting, mixing the analog data signals in a predetermined order, converting the signals to digital ones, and outputting one serial digital stream; (b) separating the serial digital streams according to the predetermined mixing order to generate digital streams corresponding to the analog data signals, and demodulating and outputting the digital streams in a predetermined manner; And (c) receiving the demodulated signal and delivering the demodulated signal to a host interface.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a schematic diagram of a wireless data transmission and reception apparatus according to the present invention. Referring to FIG. 1, the apparatus for transmitting and receiving wireless data includes a communication unit 100, a baseband unit 200, and a medium access control unit 300.

The wireless data transmission / reception apparatus according to the present invention has a 54 MBps transmission bandwidth, IEEE 802.11a (hereinafter referred to as “11a”) using a frequency of 5 GHz, and an IEEE 802.11g using a frequency of 2.4 GHz with a 54 MBps transmission bandwidth. A WLAN card that supports two modes (hereinafter referred to as "11g") is an 11a / g combo card. However, the present invention is not limited to the wireless LAN card, but may be implemented in various products such as a PDA (Personal Digital Assistant) having a circuit or chip in which the wireless data transmission / reception apparatus of the present invention is implemented, and a digital television. In addition, wireless data transceivers supporting standards other than 11a and 11g may be implemented as well as wireless data transceivers supporting two or more modes.

The communication unit 100 loads the digital stream input from the baseband unit 200 on a high frequency (RF) of a predetermined transmission frequency and converts the high frequency signal transmitted or received through an antenna into a digital stream and provides it to the baseband unit 200.

The baseband unit 200 performs orthogonal frequency division multiplex (OFDM) and complementary code keying (CCK) modulation and demodulation adopted by 11a and 11g, modulates the baseband signal, generates a digital data stream, and delivers the digital data stream to the communication unit 100. Alternatively, the digital data stream is demodulated to generate a baseband signal and transmitted to the medium access controller 300.

The medium access control (MAC) 300 performs a function of a data link layer between a network layer, which is an upper layer, and a physical layer, which is a lower layer. The data link layer is a protocol layer that governs the movement of data in and out of a physical link within a network. The data link layer initiates the link-level connection, cuts the data received from the upper layer into frames and delivers them to the physical layer. In addition, it exchanges acknowledgment information for confirming data transmission between the transmitter and the receiver, and verifies that the data in the frame is correct by checking the control bits in the frame.

When the medium access control unit 300 receives data from the host interface and transmits the data, the medium access control unit 300 determines to transmit the data at one frequency having a good communication condition among 5Ghz frequency of 11a and 2.4Ghz frequency of 11g by determining the surrounding communication conditions. If both are good, then it decides to transmit data at two frequencies, and incorporates an algorithm that flexibly distributes the transmission bandwidth allocation. The media access control unit 300 receives the information for determining the surrounding communication conditions from the baseband unit 200 to determine the surrounding communication conditions. For example, the medium access control unit 300 may receive the received signal strength (RSS) information of 5Ghz frequency of 11a and 2.4Ghz frequency of 11g from the baseband unit 200 to determine the surrounding communication conditions. have.

2 is a view for explaining an embodiment of a wireless data transmission and reception apparatus according to the present invention. Referring to FIG. 2, the apparatus for transmitting and receiving wireless data includes a dual antenna 410, a first RF filter 420, a second RF filter 430, a first RF transceiver 440, a second RF transceiver 450, and an AD. The communication unit 400 including the / DA converter 460, the baseband unit 500, and the media access control unit 300 are included.

First, the operation of the wireless data transmission / reception apparatus in the case of transmitting data will be described.

The media access control unit 300 receives data to be transmitted from the host interface to determine the surrounding communication conditions to determine the transmission frequency. The transmission frequency is determined to determine which of 11a and 11g to transmit data or whether to transmit data using both methods.

The medium access control unit 300 receives RSS_5GHz and RSS_2.4GHz indicating received signal strength (RSS) of 5Ghz frequency of 11a and 2.4Ghz frequency of 11g from the baseband unit 200, and receives both values. Compare

If there is a microwave oven in the surroundings, data transmission / reception by 2 GHz band will be interrupted by the high frequency generated from the microwave, so RSS_5 GHz will be larger than RSS_2.4 GHz. need. In the radar use area, data transmission / reception by 5GHz band is interrupted, so RSS_2.4GHz will be larger than RSS_5GHz. In this case, it is necessary to set the 2.4GHz band as the transmission / reception frequency.

When the media access control unit 300 compares the RSS_5 GHz and the RSS_2.4 GHz, the value of the RSS_5 GHz is larger than the predetermined limit indicating that the communication state is good and the value of the RSS_2.4 GHz is higher than the predetermined limit value indicating the good communication state. If small, 5 GHz is determined as the transmission frequency and data is transmitted only in the 11a manner. In the opposite case, however, 2.4 GHz is determined as the transmission frequency and data is transmitted only by the 11 g method.

When the media access control unit 300 compares the RSS_5 GHz and the RSS_2.4 GHz, and it is determined that both are larger than a predetermined limit indicating that the communication state is good, both the 5 GHz and the 2.4 GHz are determined as the transmission frequency. If the RSS_5 GHz is larger than the RSS_2.4 GHz, the media access control unit 300 allocates 80% of the amount of data to be transmitted to the carrier of 5 GHz and allocates the remaining 20% of the amount of data to the carrier of 2.4 GHz. On the contrary, if RSS_5GHz is smaller than RSS_2.4GHz, it is decided to allocate 20% of the amount of data to be transmitted to the carrier of 5GHz and 80% of the amount of transmission data to the carrier of 2.4GHz. It goes without saying that the data allocation ratio for the carrier of each frequency is not limited to this embodiment.

After determining the transmission frequency and the data allocation ratio, the medium access control unit 300 transmits the data to the baseband unit 500. When the two frequencies are determined as the transmission frequency, the data to be transmitted is divided into data to be transmitted and data to be transmitted by the 11g method according to the 11a method and transmitted to the baseband unit 500, respectively.

3 is a diagram illustrating an embodiment of the baseband unit 500 illustrated in FIG. 2. Referring to FIG. 3, the baseband unit 500 includes a modem 510 and an RSS storage unit 530. The modem 510 includes a first modem 511 and a second modem 513.

In the present embodiment, the first modem 511 performs OFDM modulation and demodulation. The second modem 513 performs CCK modulation and demodulation.

If the medium access control unit 300 determines to transmit data according to the 11a scheme in which the transmission frequency is 5 GHz, the medium access control unit 300 sends to the first modem 511 to perform OFDM modulation and demodulation employing the 11a scheme. Output

When the medium access controller 300 determines to transmit data according to the 11g scheme in which the transmission frequency is 2.4 GHz, the medium access controller 300 performs the first modem 511 performing OFDM modulation and demodulation using the 11g scheme. Or outputs to the second modem 513 which performs CCK modulation and demodulation. Since the 11g method uses the same frequency band as the 11b method, it supports CCK modulation and demodulation as well as OFDM modulation and demodulation to provide compatibility with 11b.

The first modem 511 and / or the second modem 513 receives data and performs OFDM modulation and / or CCK modulation, and then outputs the digital data stream to the AD / DA converter 460 of the communication unit 400. .

The RSS storage unit 530 provides the stored RSS_5GHz and RSS_2.4GHz values to the media access controller 300. The values of RSS_5 GHz and RSS_2.4 GHz are obtained from signals received through prior communication, such as exchanging authorization information for data transmission with the counterpart receiver before transmitting data.

The AD / DA converter 460 receives one digital stream or two digital streams from the baseband unit 500 in parallel and converts them into analog data signals. Although not separately illustrated, the AD / DA converter 460 may be implemented as two AD / DA converters for parallel processing of signals. However, it can also be implemented with a single AD / DA converter to avoid rising manufacturing costs. Another embodiment implemented with one AD / DA converter will be described later.

Data to be transmitted according to the method 11a is transmitted through the dual antenna 410 via the first RF transceiver 440, the first RF filter 420.

Data to be transmitted according to the 11g scheme is transmitted through the dual antenna 410 via the second RF transceiver 450, the second RF filter 430.

Of course, when data is transmitted in one of 11a and 11g, only one path is transmitted.

Hereinafter, an operation in the case of receiving data by using the wireless data transceiver shown in FIG. 2 will be described.

In the present embodiment, a case in which an RF signal (or carrier) of 11 GHz and an RF signal of 2.4 GHz is simultaneously received through the dual antenna 410 will be described.

The first RF filter 420 filters and outputs an RF signal (or carrier) having a frequency of 5 GHz of 11a from the signal received through the dual antenna 410.

The second RF filter 430 filters an RF signal (or carrier) of 11 g of 2.4 GHz frequency from the signal received through the dual antenna 410.

The first RF transceiver 440 receives a carrier having a frequency of 5 GHz of 11a from the first RF filter 420 and extracts an analog data signal from the carrier.

The second RF transceiver 450 receives a carrier of 11 g of 2.4 GHz frequency from the second RF filter 430 and extracts an analog data signal from the carrier.

The AD / DA converter 460 receives analog data signals from the first RF transceiver 440 and the second RF transceiver 450 in parallel, converts them into digital signals, and outputs two digital streams. As in the case of transmission, although not separately illustrated, the AD / DA converter 460 may be implemented as one AD / DA converter to avoid an increase in manufacturing cost. Another embodiment implemented with one AD / DA converter will be described later.

The first modem 511 and the second modem 513 of the baseband unit 500 perform OFDM demodulation and CCK demodulation, respectively, and output a baseband signal to the medium access control unit 300.

4 is a diagram illustrating another embodiment of the base band unit 500. Unlike the baseband unit shown in FIG. 3, the baseband unit shown in FIG. 4 further includes a demodulation mode selector 553.

The demodulation mode selector 553 determines which demodulation method to demodulate the input digital data stream and delivers the digital data stream to the corresponding modem. There are two types of data transmitted and received in the 11g method, that is, an OFDM modulated signal and a CCK modulated data. Thus, the demodulation mode selection unit 553 analyzes the header of the data stream to determine a modulation method. 511 and, if CCK modulated, to the second modem 513.

The media access control unit 300 transmits the baseband signal input from the baseband unit 500 to a host (not shown) through a host interface.

Hereinafter, another embodiment of a wireless data transmission and reception apparatus according to the present invention will be described with reference to FIG. 5.

Referring to FIG. 5, the apparatus for transmitting and receiving wireless data includes a dual antenna 610, a first RF filter 620, a second RF filter 630, a first RF transceiver 640, a second RF transceiver 650, and a PS. The communication unit 600 includes a / SP converter 660, a baseband unit 700, and a medium access control unit 300.

The difference between the wireless data transceiver shown in FIG. 5 and the wireless data transceiver shown in FIG. 2 is that in the wireless data transceiver of FIG. 2, data is transmitted in parallel through two signal lines between the communication unit 400 and the baseband unit 500. On the other hand, in the wireless data transmission / reception apparatus of FIG. 5, data transmission is performed serially through one signal line between the communication unit 600 and the baseband unit 700. By exchanging data serially between the communication unit 600 and the baseband unit 700, the data processing speed can be reduced somewhat, but there is an advantage that the system can be implemented at a lower cost and efficiently utilize system resources.

First, the operation of the wireless data transmission / reception apparatus in the case of transmitting data will be described.

The media access control unit 300 receives data to be transmitted from the host interface to determine the surrounding communication conditions to determine the transmission frequency. The transmission frequency is determined to determine which of 11a and 11g to transmit data or whether to transmit data using both methods. Since the operation of the medium access control unit 300 is the same as that of the wireless data transceiver of FIG.

FIG. 6 is a diagram illustrating an embodiment of the baseband unit 700 illustrated in FIG. 5. Referring to FIG. 6, the baseband unit 700 includes a modem 710, a timer 720, and an RSS storage unit 730. Modem 710 includes a first modem 711 and a second modem 713.

In this embodiment, the first modem 711 performs OFDM modulation and demodulation. The second modem 713 performs CCK modulation and demodulation.

If the medium access control unit 300 determines to transmit data according to the 11a scheme in which the transmission frequency is 5 GHz, the medium access control unit 300 sends to the first modem 711 to perform OFDM modulation and demodulation using the 11a scheme. Output

When the medium access control unit 300 determines to transmit data according to the 11g scheme in which the transmission frequency is 2.4 GHz, the medium access controller 300 performs the first modem 711 performing OFDM modulation and demodulation using the 11g scheme. Or outputs to the second modem 713 which performs CCK modulation and demodulation.

The first modem 711 and / or the second modem 713 receive data, perform OFDM modulation and / or CCK modulation, and output a digital data stream, respectively.

When all of the digital streams are output from the first modem 711 and the second modem 713, the timer 720 repeatedly turns on / off each of these digital streams sequentially to generate one serial digital stream, thereby communicating with the communication unit ( 600). For example, the timer 720 alternately turns on / off the outputs of the first modem 711 and the second modem 713 so that the odd-numbered data of the serial digital stream input to the communication unit 600 is input to the first modem 711. And the even-numbered data are the output data of the second modem 713. When the digital stream is output only from one of the first modem 711 and the second modem 713, the above-described operation of the timer 720 is not necessary.

The RSS storage unit 730 provides the media access control unit 300 with the stored values of RSS_5GHz and RSS_2.4GHz. The values of RSS_5 GHz and RSS_2.4 GHz are obtained from signals received through prior communication, such as exchanging authorization information for data transmission with the counterpart receiver before transmitting data.

The PS / SP converter 660 receives one serial digital stream from the baseband unit 700 and converts it into an analog data signal. The PS / SP converter 660 turns on the analog data signal when all the digital streams are output from the first modem 711 and the second modem 713 and synthesized into one serial digital stream by the timer 720. It turns on / off and separates each analog data signal corresponding to each digital stream which is an output of the first modem 711 and the second modem 713.

8 is a view for explaining the detailed configuration of the PS / SP converter 660 shown in FIG. Referring to FIG. 8, the PS / SP converter 660 includes an AD / DA converter 661 and a timer 663.

The AD / DA converter 661 receives one digital stream, converts it into an analog signal, and outputs an analog data signal.

If all the digital streams are output from the first modem 711 and the second modem 713 and synthesized into one serial digital stream by the timer 720, the timer 663 may be configured as the baseband unit 700. Each digital that is the output of the first modem 711 and the second modem 713 by alternately turning on / off the same two analog data signals that are the outputs of the AD / DA converter 661 in synchronization with the timer 720. The analog data signal, which is the output of the AD / DA converter 661, is separated into two analog data signals corresponding to the stream.

Data to be transmitted according to the method 11a is transmitted through the dual antenna 610 via the first RF transceiver 640, the first RF filter 620.

Data to be transmitted according to the 11g scheme is transmitted through the dual antenna 610 via the second RF transceiver 650, the second RF filter 630.

Of course, when data is transmitted in one of 11a and 11g, only one path is transmitted.

Hereinafter, an operation of the wireless data transceiver when receiving data using the wireless data transceiver shown in FIG. 5 will be described.

In the present embodiment, a case in which a carrier having a frequency of 11 GHz and a carrier having a frequency of 11 GHz is simultaneously received through the dual antenna 610 will be described.

The first RF filter 620 filters and outputs an RF signal (or carrier) having a frequency of 5 GHz of 11a from the signal received through the dual antenna 610.

The second RF filter 630 filters the RF signal (or carrier) of 11 g of 2.4 GHz frequency from the signal received through the dual antenna 610.

The first RF transceiver 640 receives a carrier having a frequency of 5 GHz of 11a from the first RF filter 620 and extracts an analog data signal from the carrier.

The second RF transceiver 650 receives an 11 g of 2.4 GHz frequency carrier from the second RF filter 630 and extracts an analog data signal from the carrier.

The PS / SP converter 660 receives analog data signals in parallel from the first RF transceiver 640 and the second RF transceiver 650, respectively, and outputs one serial digital stream. The timer 663 alternates two analog data signals alternately on and off, so that only one signal is input to the AD / DA converter 661 at a time and thus one serial digital stream is output.

The serial digital stream, which is the output of the PS / SP converter 660, is input to the baseband unit 700 and demodulated according to a predetermined demodulation scheme.

According to an embodiment of the baseband unit 700 shown in FIG. 6, the timer 720 is synchronized with the timer 663 of the PS / SP converter 660 to the first modem 711 and the second modem 713. Alternately turn on and off serial digital streams simultaneously. The data component received according to the 11a scheme and the data component received according to the 11g scheme, which were synthesized into one serial digital stream by the timer 663 of the PS / SP converter 660 by the on / off operation of the timer 720. The digital streams are separated into respective digital streams and input to the first and second modems 711 and 713, respectively.

The first modem 711 and the second modem 713 perform OFDM demodulation and CCK demodulation, respectively, to generate a baseband signal, and output the baseband signal to the medium access control unit 300.

FIG. 7 is a diagram illustrating another embodiment of the base band unit 700 illustrated in FIG. 5. Unlike the baseband unit shown in FIG. 6, the baseband unit shown in FIG. 7 further includes a demodulation mode selector 753.

The demodulation mode selection unit 753 determines which demodulation method to demodulate the input digital data stream and delivers the digital data stream to the corresponding modem. There are two types of data transmitted and received by the 11g method, that is, an OFDM modulated signal and a CCK modulated data. Therefore, the demodulation mode selection unit 753 analyzes the header of the data stream to determine a modulation method. 751) and, if CCK modulated, to the second modem 753.

The media access control unit 300 transmits the baseband signal input from the baseband unit 700 to a host (not shown) through the host interface.

Based on the configuration as described above, the wireless data transmission method according to the present invention will be described below with reference to FIGS.

9 is a flowchart illustrating a wireless data transmission method according to the present invention.

In order to wirelessly transmit data by loading data on a carrier having at least two different reference frequencies, first, at least one transmission frequency for data transmission is determined by determining wireless communication conditions for each of the plurality of reference frequencies. step).

In operation 830, a data stream is generated by performing modulation of at least one method corresponding to the at least one transmission frequency determined in operation 810.

The data stream is transmitted on at least one carrier of at least one transmission frequency determined in operation 810 (operation 850).

FIG. 10 is a flowchart for describing an exemplary embodiment of the detailed configuration of step 810 illustrated in FIG. 9.

When there are two reference frequencies f1 and f2, the wireless data transmission apparatus compares RSS_f1 and RSS_f2, that is, the strength of the received signal for each frequency, to determine a communication condition for each frequency (step 811).

In operation 812, it is determined whether the RSS signal has a received signal having a frequency greater than a predetermined threshold indicating that communication conditions are good.

As a result of the determination in step 812, if only one of the reference frequencies f1 and f2 is determined to be in good communication condition, one of the reference frequencies f1 and f2 is determined as the transmission frequency, and one of 11a or 11g corresponding to the frequency is determined. In operation 830, the data stream is modulated by modulating the data.

On the other hand, if it is determined in step 812 that both the reference frequencies f1 and f2 are in good communication conditions, RSS_f1 and RSS_f2 are compared to allocate x% of data to a frequency with a large RSS value and have a small RSS value. Allocate (100-x)% of data to the frequency to transmit. Here, x is set to a value greater than 50 so that more data is loaded on a frequency with a larger RSS value. In this example, x is 80.

FIG. 11 is a flowchart illustrating an exemplary embodiment of a detailed configuration of step 830 of FIG. 9.

This embodiment is a process performed in the baseband unit 700 shown in FIG. That is, two data streams are mixed in a predetermined manner to generate one serial data stream and output the same to the communication unit 600.

First, in operation 831, a data stream is generated by modulating data according to a method corresponding to a transmission frequency.

Since there are two or more transmission frequencies, it is determined whether two or more data streams are generated by modulating the data according to a modulation scheme corresponding to each transmission frequency (step 833).

If there is more than one data stream, one serial data stream is generated as in operation of the baseband unit 700 shown in FIG. 6 (operation 835).

FIG. 12 is a flowchart illustrating an exemplary embodiment of a detailed configuration of step 850 illustrated in FIG. 9.

This embodiment corresponds to a process performed by the communication unit 600 shown in FIG. 5.

First, the data stream is converted into an analog data signal (step 851).

It is determined whether the transmission frequency is two or more (step 853).

If the transmission frequency is two or more, the analog data signal generated in operation 851 is divided into two or more analog data signals to be transmitted for each transmission frequency (operation 855). Separation of the signal may be performed by the timer 663 shown in FIG.

In step 835, an analog data signal is loaded on a carrier having a transmission frequency.

Hereinafter, a method of receiving wireless data according to the present invention will be described with reference to FIG. 13.

13 is a flowchart illustrating a method of receiving wireless data according to the present invention.

In step 910, carriers of at least two reference frequencies are simultaneously received.

The received signal is filtered to separate each carrier (step 920).

Each analog data signal carried on each carrier is extracted (step 930).

Each analog data signal extracted in operation 930 is mixed in a predetermined order to generate one serial signal (operation 940). The generation to one serial signal may be performed by the timer 663 shown in FIG.

One serial signal is digitally converted to generate one serial digital stream (S950).

The serial digital streams are separated according to a predetermined mixing sequence in operation 940, and are respectively divided into digital streams corresponding to the analog data signals generated in operation 930 (operation 960).

Each digital stream separated in operation 960 is demodulated in a predetermined manner (operation 970). The header of each digital stream can be analyzed to see how to demodulate it.

The demodulated data is transmitted to the host through the host interface (step 980).

As described above, an environmentally compatible wireless data transmission / reception apparatus and a transmission / reception method according to the present invention provide the following effects.

First, it is possible to obtain a transmission bandwidth that a conventional wireless data transceiver such as a combo wireless card does not provide. In the case of simultaneously transmitting data in two channels according to two methods of IEEE 802.11a and IEEE 802.11g, a transmission bandwidth of up to 108 MBps can be obtained. By increasing the transmission channel, the transmission bandwidth can be further increased.

Second, data transmission and reception using the first frequency and the second frequency, which are different frequencies, can be used to adapt to the surrounding communication environment. That is, the first frequency uses a second frequency if the communication environment is not good, and conversely, if the second frequency does not have a good communication environment, data is transmitted and received adaptively to the surrounding communication environment by using the first frequency.

Third, by diversifying communication channels, problems of disconnection and crosstalk resulting from interference between channels can be solved.

Claims (22)

A wireless data transmission apparatus for wirelessly transmitting data on a carrier having at least two different reference frequencies, A medium access control unit determining at least one of the reference frequencies as a transmission frequency by determining a wireless communication condition; A baseband unit which receives data from the medium access control unit and outputs a data stream by performing at least one type of modulation corresponding to the transmission frequency determined by the medium access control unit, respectively; And And a communication unit for transmitting the data stream output from the baseband unit to at least one carrier having the at least one transmission frequency. According to claim 1, The media access control unit determines the at least one transmission frequency by determining the radio communication conditions for each reference frequency according to the information indicating the radio communication conditions for each reference frequency input from the baseband unit. . The method of claim 2, The information indicating the radio communication conditions for each reference frequency input from the baseband unit is a wireless data transmission device, characterized in that the strength of the received signal for each reference frequency. The method of claim 3, wherein And the medium access control unit determines a reference frequency of a received signal having the greatest intensity of the received signal for each reference frequency as a transmission frequency. The method of claim 3, wherein And the medium access control unit determines a reference frequency of at least two or more received signals in which a strength of the received signal for each reference frequency is within a predetermined range indicating that communication conditions are good, as a transmission frequency. The method of claim 5, The media access control unit compares the strengths of the at least two received signals having good communication conditions, and determines to load more data on a carrier having a reference frequency of a received signal having a greater signal strength as a transmission frequency. Wireless data transmission device. The method of claim 5, wherein the base band portion A modem for receiving data to be transmitted for each of at least two transmission frequencies determined by the medium access control unit in parallel and performing modulation of a scheme corresponding to each transmission frequency to output at least two data streams in parallel; And And a first timer configured to sequentially turn on / off the at least two data streams output in parallel from the modem to output one serial data stream. The method of claim 7, wherein the communication unit A D / A converter which receives the serial data stream output from the baseband unit and converts the serial data stream into an analog signal; And And a second timer for synchronizing with the first timer to turn on / off an output signal of the D / A converter to convert data to be transmitted for each transmission frequency in parallel. A wireless data transmission method for wirelessly transmitting data on a carrier having at least two different reference frequencies, (a) determining at least one of the reference frequencies as a transmission frequency by determining a wireless communication condition; (b) generating a data stream by performing at least one type of modulation corresponding to each of the transmission frequencies determined in step (a); And and (c) transmitting the data stream generated in step (b) on at least one carrier having the at least one transmission frequency. The method of claim 9, Step (a) is a step of determining the at least one transmission frequency by determining the wireless communication conditions for each reference frequency according to the strength of the received signal for each reference frequency. The method of claim 10, The step (a) is a step of determining the reference frequency of the received signal having the largest intensity of the received signal for each reference frequency as a transmission frequency. The method of claim 10, The step (a) is a step of determining a reference frequency of at least two or more received signals in a predetermined range indicating that the strength of the received signal for each reference frequency is in good communication condition as a transmission frequency. . The method of claim 12, The step (a) is a step of comparing the strength of the at least two received signals having good communication conditions, and determining to load more data on a carrier having a reference frequency of a received signal having a large signal strength as a transmission frequency. A wireless data transmission method characterized by the above-mentioned. The method of claim 12, wherein step (b) (b1) receiving data to be transmitted for each of the determined at least two transmission frequencies in parallel, performing modulation in a manner corresponding to each transmission frequency, and outputting at least two data streams in parallel; And and (b2) outputting one serial data stream by mixing the at least two data streams output in parallel in a predetermined order. The method of claim 14, wherein step (c) (c1) receiving the serial data stream and converting the analog data signal into an analog data signal; (c2) separating the analog data signal according to a predetermined mixing order in step (b2) and converting the analog data signal into at least two analog data signals to be transmitted for each transmission frequency; And and (c3) carrying each of said at least two analog data signals corresponding to carriers of said at least two transmission frequencies. In the wireless data receiving apparatus for receiving and processing data at the same time at least two carriers having different reference frequencies, Simultaneously receiving carriers having at least two different reference frequencies, extracting analog data signals carried on each carrier, mixing the analog data signals in a predetermined manner, converting them to digital, and outputting one serial digital stream. Communication unit; A baseband unit which receives the serial digital stream from the communication unit, generates at least two digital streams by separating the serial digital streams by the inverse method of the predetermined mixed method, and demodulates and outputs the respective digital streams by a predetermined method; And And a medium access control unit which receives the demodulated signal from the baseband unit and transmits the demodulated signal to a host interface. The method of claim 16, wherein the communication unit An antenna for simultaneously receiving a carrier having at least two different reference frequencies; At least two filters for filtering the signal including the at least two carriers to output each carrier signal; At least two transceivers for extracting and outputting an analog data signal from a carrier output from each filter; And And a PS converter which receives at least two or more analog data signals output from the transceivers in parallel, mixes them in the predetermined manner, and digitally converts them to output the serial digital stream. The method of claim 17, wherein the PS converter An AD converter which receives at least two analog data signals output from the transceivers in parallel and converts the analog data signals into digital signals and outputs the serial digital stream; And Sequentially repeating on / off at least two or more of the analog data signals output in parallel from each transceiver to input one serial analog data signal to the AD converter so that the AD converter outputs the one serial digital stream. And a first timer for controlling the wireless data receiving apparatus. The method of claim 16, wherein the base band portion At least two modems receiving the serial digital stream which is the output of the A / D converter and performing demodulation of a predetermined scheme; And And a second timer synchronized with the first timer to turn on / off the serial digital stream which is an output of the A / D converter and input the digital stream to the respective modems. . In the wireless data receiving method for receiving and processing data at the same time at least two carriers having different reference frequencies, (a) Simultaneously receiving carriers having at least two different reference frequencies, extracting analog data signals carried on each carrier, mixing the analog data signals in a predetermined order, and converting them to digital to form a single serial digital stream. Outputting; (b) separating the serial digital streams according to the predetermined mixing order to generate digital streams corresponding to the analog data signals, and demodulating and outputting the digital streams in a predetermined manner; And and (c) receiving the demodulated signal and transferring the demodulated signal to a host interface. The method of claim 20, wherein step (a) (a1) simultaneously receiving a carrier having the at least two different reference frequencies through an antenna; (a2) filtering the signal including the at least two carriers and separately outputting each carrier signal; (a3) extracting and outputting an analog data signal from each carrier; And (a4) generating one serial signal by mixing the at least two or more analog data signals in the predetermined order; And (a5) converting the one serial analog signal to digital to generate the serial digital stream. The method of claim 20, wherein step (b) (b1) generating the at least two digital streams corresponding to the at least two analog data signals by separating the serial digital stream according to the predetermined mixing order of step (a4); And (b2) demodulating and outputting the digital streams in a predetermined manner.