JPH09289471A - Radio communication card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication card which can be loaded into a personal computer or a portable information terminal card slot and can attain its miniaturization and small power consumption together with elimination of radiation noises, etc., by packaging a card interface and a base band signal processor into the card in the form of two LSIs. SOLUTION: A card interface circuit 24 of PCMCIA included in a radio communication card 300 secures an interface to a personal computer. A MODEM circuit 22 modulates and demodulates the digital signal. A spectrum spread circuit 21 performs the spectrum spread of the modulated signal and adversely spreads the received signal. A frequency conversion circuit 20 converts a base band signal into the frequency of an RF band. The circuits 24, 22 and 21 is compared of digital circuits and can be turned into a digital LSI, and the circuit 20 consists of an analog circuit of high frequency and can be turned into an analog LSI respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication card that can be inserted into a card slot of a processing device such as a personal computer for processing digital data.

[0002]

2. Description of the Related Art The digitalization of wireless communication has enabled high-speed wireless data communication. at the same time,
The office OA environment is becoming more sophisticated and one OA device is being distributed to each person. This allows OA
Digital noise generated by devices interferes with wireless communication and is causing deterioration of wireless line quality.

A spread spectrum system is a wireless transmission system that is resistant to these noises. This spreads the transmission frequency band widely, despreads the narrow band noise received during wireless transmission at the time of reception, and restores the band to the original.
It removes narrow band noise.

[0004]

However, in the spread spectrum system, the circuit scale becomes large because the circuit of the spread spectrum portion is added in addition to the normal modulation / demodulation circuit, and it is difficult to miniaturize it. As one of the products of conventional wireless transmission system using spread spectrum method, wireless LAN (WAV
E-LAN, etc.) Since 2.4GHz is used for the transmission frequency band, the hardware scale of the frequency conversion circuit in the high frequency part is large, and the circuit scale of the baseband part is also large at a high transmission speed of 10Mbps, and the baseband means and frequency conversion means are It was separated and implemented in a separate case.

On the other hand, if the 300 MHz band is used as the transmission frequency band and the transmission speed is suppressed to about 20 kbps, there is a possibility that the circuit scale of the frequency conversion circuit and the baseband circuit can be reduced.

An object of the present invention is to use an ultra-compact spectrum spreader that can be mounted in a card slot of a personal computer or a portable information terminal in a wireless communication specification using a transmission frequency band of MHz band and a transmission rate of about 20 kbps. To provide the wireless communication card that was used.

[0007]

Means for Solving the Problems A first method for solving the above problems is described below.
Of the present invention, the card interface means to be mounted on the wireless communication card is integrated into an LSI, the baseband signal processing means in which the modulation / demodulation processing means and the spread spectrum despreading means are integrated into one chip is integrated into an LSI, and at least these two LSIs are mounted to the card. , Realizes a wireless communication card.

A second invention for solving the above problems is to integrate a card interface means, a modulation / demodulation processing means, and a spread spectrum despreading means, which are mounted on a wireless communication card, into a single chip into an LSI, and at least this L
The SI is mounted on the card to realize a wireless communication card. A third aspect of the invention for solving the above problems is to integrate a card interface unit, a modulation / demodulation processing unit, and a spread spectrum despreading unit mounted on a wireless communication card into a single chip into a baseband signal processing unit that is an LSI, and has a frequency having an analog high frequency circuit. The conversion means is converted to an analog LSI, and at least these two LSIs are mounted on a card to realize a wireless communication card.

A fourth invention for solving the above-mentioned problem is a baseband signal processing means in which a modulation / demodulation processing means and a spread spectrum despreading means mounted on a wireless communication card are integrated into one chip.
The frequency conversion means having an analog high-frequency circuit is converted into an analog LSI, and at least these two LSIs are mounted on a card to realize a wireless communication card. In order to eliminate digital noise from a personal computer or a portable information device body, a fifth invention for solving the above-mentioned problems uses a noise filter for each power source and ground of the baseband signal processing means and the frequency conversion means. It is designed to be connected.

A sixth invention for solving the above problem is to mount the antenna of the wireless communication card at least 10 cm away from the body of a personal computer or the like so that the influence of radiation noise from the personal computer can be reduced. It is a thing.

A seventh invention for solving the above-mentioned problems uses weak power as transmission power of a wireless communication card.

An eighth invention for solving the above-mentioned problems uses a specific small power as transmission power of a wireless communication card.

A ninth invention for solving the above-mentioned problems is to provide a card interface means with a serial interface means so that standard driver software of a personal computer can be used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, before explaining the present invention, the configuration of a general wireless communication system to which a spread spectrum system is applied will be shown.

FIG. 2 shows a wireless communication system using general spread spectrum. The wireless communication system includes a modulation / demodulation circuit 22, a spread spectrum circuit 21, and a frequency conversion means 20.
It is composed of The modulation circuit 22 is composed of a modulation circuit 1 and a demodulation circuit 11, the spectrum spreading circuit 21 is composed of a spreading circuit 2 and a despreading circuit 10, and the frequency conversion circuit 20 is a mixer 3 for transmission (hereinafter abbreviated as MIX3). ),
Transmission amplifier 4, transmission bandpass filter 5 (hereinafter abbreviated as BPF5) Antenna switch 6 (hereinafter abbreviated as SW6), reception B
PF7, receiving amplifier 8, receiving MIX9, local oscillator 1
2 (hereinafter abbreviated as OSC12).

At the time of transmission, SW6 is used for the transmission circuit and the antenna 23.
Connect. The transmission signal 30 is modulated by the modulation circuit 1,
The signal is spread by the spreading circuit 2, frequency-converted to a high frequency band signal by MIX3, amplified by the amplifier 4, limited to a predetermined band by the BPF5, and output from the antenna 23. Further, during reception, SW6 connects the antenna 23 and the receiving circuit. The received signal is input from the antenna 23, noise-removed by the BPF 7, amplified by the amplifier 8, converted into the frequency of the baseband band by the MIX 9, converted into the original narrowband signal by the despreading circuit 10, and demodulated by the demodulation circuit. At 11, it is converted to a digital signal.

Next, the wireless communication card of the present invention will be described. First, the system configuration of the present invention is shown in FIG. The present invention is a wireless communication card which is inserted into a card slot of a portable information terminal such as a personal computer or PDA (Hersonal Digital Assistant) to perform wireless communication.

FIG. 1 shows the configuration of the wireless communication card of the present invention. The wireless communication card of the present invention is a PCMCIA card interface circuit 2 for realizing an interface with a personal computer.
4, a modulation / demodulation circuit 22 that modulates and demodulates a digital signal, a spread spectrum circuit 21 that spreads the modulated signal and despreads the received signal, and a frequency conversion circuit 20 that converts the signal in the base band to the frequency in the RF band. ，
It is composed of an antenna 23.

The card interface circuit 24, the modulation / demodulation circuit 22, and the spread spectrum circuit 21 are composed of digital circuits, and include a gate array, a sund cell, and a full custom.
Digital LSI such as LSI is possible. Further, the frequency conversion circuit 20 is a high frequency analog circuit, and the analog LS
It can be converted to I.

Transmission frequency is 300MHz band, transmission rate is 20kb
If it is about ps, the PCMCIA card interface circuit 2
4. The circuit scales of the modulation / demodulation circuit 22 and the spread spectrum circuit 21 are each about 10 k gates, and can be made into an LSI by optimally dividing the chip in consideration of the degree of integration and the price.

When the process and device are stabilized and a device having a manufacturing record of about 1 μm is used, it may be possible to realize a lower cost by dividing the LSI into a low integration degree (for example, about 10 k gates).

FIG. 3 shows an LSI block diagram at this time. In this case, the card interface circuit 24, the modulation / demodulation circuit 22, and the spread spectrum circuit 21 are divided into a card interface LSI 124, a modulation / demodulation LSI 122, and a spread spectrum LSI 121.

Further, in order to realize the miniaturization, the most advanced process and device are used, and as shown in FIG.
The card interface circuit 24, the modulation / demodulation circuit 22, the spread spectrum circuit 21, and the frequency conversion circuit 20 are integrated into an analog / digital LSI 130.

As an intermediate between the above two LSIs, as shown in FIG.
From FIG. 8 to FIG. 8, the chips can be divided according to variations.

FIG. 5 shows the card interface LSI 124.
A modulation / demodulation circuit 22 and a spread spectrum circuit 21 are integrated into a single chip, and a baseband LSI 131 and a frequency conversion circuit 20 are included.

FIG. 6 shows a card interface circuit 24,
The modulation / demodulation circuit 22 and the spread spectrum circuit 21 are composed of a digital section LSI 132 and a frequency conversion circuit 20.

FIG. 7 shows a card interface LSI 124.
A modulation / demodulation circuit 22, a spread spectrum circuit 21, and a frequency conversion circuit 20 are integrated into a single radio communication LSI 133.

Further, when the wireless communication card is inserted into a device such as a personal computer which generates digital noise, it is important to remove the noise. Therefore, in the present invention, as shown in FIG. 8, the coil 2 is connected to the power supply and the ground between the card interface circuit 24, the modulation / demodulation circuit 22, the digital part of the spread spectrum circuit 21 and the frequency conversion circuit 20.
00, 201, 203 and the capacitor 202,
A noise filter is installed to remove digital noise.

Further, as shown in FIG. 9, even when the card is inserted so that the antenna does not directly receive noise from the personal computer body, at least 10c from the personal computer body
m Position the antenna so that it is separated.

This wireless communication card can realize a small size and a low price, and particularly when it is specified to be used indoors, it is preferable to use a weak power (-43 dBm) or a specific small power (10 mWatt) as the transmission power. .

In this wireless communication card, by using the serial interface means in the card interface means, standard driver software such as a personal computer can be used, and the usability is improved.

The present invention is not limited to a personal computer or a portable information communication terminal device, but can be applied to household electric appliances, game machines, car wireless keys, and other OA equipment using wireless communication.

[0033]

As described above, according to the present invention,
When realizing a wireless communication card that can be inserted into a card slot of a personal computer or a portable information communication terminal device, it becomes possible to realize downsizing and low power consumption.

Further, the influence of radiation noise from the personal computer main body and noise from other OA equipment can be reduced, and high quality wireless transmission can be performed.

Further, since spread spectrum is used, confidential communication can be performed and data security can be guaranteed.

As a result, the usability of a personal computer or a portable information communication terminal can be improved, and its effect is great.

[Brief description of drawings]

FIG. 1 is an example of a configuration diagram of a wireless communication card of the present invention.

FIG. 2 is an example of a system configuration diagram using a spread spectrum system.

FIG. 3 is a diagram showing an example of an LSI configuration of a wireless communication card of the present invention.

FIG. 4 is a diagram showing an example of an LSI configuration of a wireless communication card of the present invention.

FIG. 5 is a diagram showing an example of an LSI configuration of a wireless communication card of the present invention.

FIG. 6 is a diagram showing an example of an LSI configuration of a wireless communication card of the present invention.

FIG. 7 is a diagram showing an example of an LSI configuration of a wireless communication card of the present invention.

FIG. 8 is an embodiment of the configuration of the power supply and ground of the present invention.

FIG. 9 is a diagram illustrating an example of mounting the antenna of the present invention.

FIG. 10 is a diagram illustrating an example of a system using the wireless communication card of the present invention.

[Explanation of symbols]

300 ... Wireless communication card, 20 ... Frequency conversion circuit, 21 ... Spread spectrum circuit, 22 ... Modulation / demodulation circuit, 23 ... Antenna, 24 ... Card interface circuit, 20, 201, 203 ... Coil, 20
2 ... Capacitor.

Claims (10)

[Claims] 1. A wireless communication card to which a spread spectrum system is applied, which has a card interface means such as a personal computer, a modulation / demodulation processing means, a spread spectrum despreading means and a frequency conversion means, and can be mounted in a card slot. . 2. The wireless communication card according to claim 1, comprising at least a card interface LSI, a baseband signal processing LSI in which a modulation / demodulation processing means and a spread spectrum despreading means are integrated into one chip. 3. The wireless communication card according to claim 1, wherein at least the card interface means, the modulation / demodulation processing means and the spread spectrum despreading means are integrated into one chip.
Wireless communication card composed of I. 4. The wireless communication card according to claim 1, wherein at least the card interface means, the modulation / demodulation processing means, the spread spectrum despreading means, and the frequency conversion means are integrated into an analog-digital mixed LSI. 5. The wireless communication card according to claim 1, comprising at least a modulation / demodulation processing means, a spread spectrum despreading means, and a frequency conversion means in a single chip in a wireless communication LSI. 6. The wireless communication card according to claim 1, wherein the power supply and the ground of the baseband signal processing means and the frequency conversion means are connected by a noise filter. 7. The wireless communication card according to claim 1, wherein the mounting position of the antenna is at least 10 from the main body such as a personal computer.
A wireless communication card that is mounted at a distance of cm. 8. The wireless communication card according to claim 1, wherein weak power is used as transmission power. 9. The wireless communication card according to claim 1, wherein a specific small amount of power is used as transmission power. 10. The wireless communication card according to claim 1, further comprising serial interface means.