JPH10322260A - Radio receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly output a display that reception is disabled with respect to a radio receiver of an SS-FH system. SOLUTION: By the radio receiver 11 of the SS-FH system, a receiving condition whether the reception is possible or not is judged based on data to be detected which is transmitted by each frequency channel of frequency hopping. Specifically, frequency of reception of the data to be detected by a radio unit 13 is counted by a counter 18, the counted frequency is compared with a threshold value held in a memory 17 by a comparison part 19 and when the counted frequency is not more than the threshold value, a message 'out of a range' indicating that the reception is disabled is displayed and outputted on a display by a display part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver for receiving data wirelessly by spread spectrum communication using a frequency hopping modulation method, and more particularly to a technique for displaying whether or not transmitted data can be received wirelessly. About.

[0002]

2. Description of the Related Art Spread spectrum communication (SS communication)
This is a communication system in which a carrier is spread-modulated with a wide-band coded sequence, and data to be transmitted is spread and transmitted in a signal of a wide frequency band, and is used in various wireless communication systems. One of the spread modulation schemes in the SS communication scheme is a frequency modulation hopping scheme (FH scheme).
In the scheme, data communication is performed at a carrier frequency (frequency channel) corresponding to the state of the code according to the order defined by the coded sequence.

[0003] Here, for example, a portable telephone is provided with a function for displaying and outputting whether or not reception is possible due to changes in the radio wave environment. In the wireless receiver 1 having such a display function, as shown in FIG. 3, data (radio waves) transmitted wirelessly is received by the antenna 2 and demodulated by the wireless unit 3. The A / D converter 4 converts the received electric field intensity output from the wireless unit into a digital signal and inputs the digital signal to the CPU 5, which then sets the received electric field intensity level (digital value) to a preset receivable / receivable value. When the reception electric field strength level is lower than the threshold value and the reception is not possible as compared with the threshold value indicating that the reception is impossible, the liquid crystal display of the display unit 6 indicates that the reception is impossible (for example,
The character "out of range" on the mobile phone is displayed and output.

[0004]

In the case where the above-mentioned display output function is provided in a radio receiver of the spread spectrum communication system (SS-FH system) by frequency modulation hopping, the radio receivers are sequentially switched. It is difficult to determine the reception field strength level in all frequency channels because data is received by the frequency channels of the above. For this reason, the reception field strength level is determined only in a certain specific frequency channel. Thus, as described above, the fact that reception is impossible is displayed and output.

[0005] However, in such an SS-FH radio receiver, if it is determined that reception is possible on the frequency channel to be determined, it is impossible to receive on other frequency channels. Also, no indication of non-reception was made on the liquid crystal display and the SS-F
There has been a problem that the reception status in H wireless reception cannot be displayed accurately. Conversely, if it is determined that reception is not possible on the frequency channel being determined, even if reception is possible on another frequency channel, an indication that reception is impossible is made on the liquid crystal display. As a result, there has been a problem that the reception status cannot be displayed accurately.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and in a SS-FH wireless communication, a wireless reception capable of performing more accurate display output indicating that reception is impossible than in the past. The purpose is to provide a machine.

[0007]

In order to achieve the above object, a radio receiver of the SS-FH system according to the present invention is capable of receiving data based on detection target data transmitted at each frequency of frequency hopping. The reception state of whether the reception is possible or not is determined. That is, in the wireless receiver, the number of times that the detection target data is received by the receiving unit is counted by the counter, and the counted number is compared with the threshold value stored in the memory by the comparing unit. At times, the display means outputs a message indicating that reception is not possible.

[0008] The display indicating that reception is not possible is output on the display of the display means with characters such as "out of service area". There is no limitation. In addition, as a preferred embodiment of the present invention, in order to facilitate determination of other received data, detection target data having the same content determined in advance between a wireless transmitter and a wireless receiver is transmitted to each frequency channel of frequency hopping. Although it is determined in advance that the detection target data is data for determining that reception is possible between the wireless transmitter and the wireless receiver even if the data is not the same over all frequency channels. I just need.

Further, the radio receiver of the present invention can be implemented as various communication devices such as a stationary radio receiver, a pager, a transceiver, a portable telephone, etc., and has both a transmission function and a reception function. In the transceiver, the operation may be performed in the reception function unit. Further, when to transmit the detection target data is set in accordance with the communication system to which the present invention is applied, such as transmitting at all times, transmitting at all times if transmission is possible, transmitting at a certain time interval, and the like. You. For example, in a mobile phone system, data to be detected is constantly transmitted from a base station, and in a transceiver system with a relatively narrow band used, data to be detected is transmitted from a wireless transmitter during a period between transmission data.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a radio receiver according to the present invention will be described with reference to the drawings. FIG. 1 shows a wireless receiver 11 of the present embodiment, and FIG. 2 shows a wireless communication system according to the present embodiment. In the present embodiment, the same data to be detected is wirelessly transmitted from the wireless transmitter 10 in each frequency channel of frequency hopping, and the wireless receiver 11 receives these data while synchronously switching the receiving frequency channel. ing. Therefore, if there are n frequency hopping frequency channels,
The detection target data is repeatedly transmitted from the wireless transmitter 10 to the wireless receiver 11 n times. The original transmission data is also wirelessly communicated between the wireless transmitter 10 and the wireless receiver 11 by the SS-FH method at the same time as the detection target data or at a different timing.

A radio receiver 11 includes an antenna 12 for receiving data (radio waves) transmitted by radio, a radio unit 13 for demodulating radio waves received by the antenna, a reception data and a reception electric field output from the radio unit 13. An A / D converter 14 for digitally converting the intensity; a processor (CPU) 15 for performing a predetermined process such as a reception process or a reception status determination process based on the digitally converted received data or the received electric field intensity; And a memory 17 that readablely stores a threshold value for determining the reception status.

The threshold value m stored in advance in the memory 17 is a value that is equal to or greater than zero and equal to or less than n in the case where there are n frequency channels. The situation is determined strictly, and if the threshold value m is a small value, the reception situation is determined loosely. Therefore, the wireless communication system to be implemented is set according to the required communication accuracy.

The CPU 15 comprises a counter 18 and a comparing section 19, and the counter 18 counts the number of times of reception of the detection target data normally received by the wireless unit 13 via the antenna 12, and the comparing section 19 The number of receptions counted by the counter 18 and the threshold value m held in the memory 17
And causes the display unit 16 to output a display indicating the reception status. In this embodiment, the counter 18 and the comparison unit 19 are configured by the CPU 15 executing a predetermined control program set in advance. However, each of these functional units may be configured as a hardware circuit.

According to the radio receiver 11 having the above configuration, the counter 18 counts how many of the n pieces of detection target data transmitted from the radio transmitter 10 have been normally received. The comparison unit 19 compares the number of times x with the threshold value m, and outputs an indication (in this example, “out of service”) to the display of the display unit 16 according to the comparison result. That is, when x of the n pieces of detection target data can be normally received, if the number of receptions x is equal to or less than the threshold value m, “out of service area” is displayed on the display of the display unit 16 and the number of receptions x is equal to the threshold value. When the value exceeds m, the display of "out of service area" is not performed. This allows the user to easily recognize the quality of the reception condition under the condition where all the frequency channels are integrated.

If the threshold value m is set to be equal to the number of transmissions n, "out of service" is displayed when normal reception is not possible even on one frequency channel, and the result of the determination of the reception status based on extremely strict criteria Can be notified to the user. Conversely, if the threshold value m is set to a value close to zero, the "out of service" display will not be displayed if normal reception can be performed even on one frequency channel, and the result of determining the reception status on the basis of a loose standard will be presented to the user. Can be notified.

[0016]

As described above, according to the present invention,
In the SS-FH system, the reception status of all frequency channels is comprehensively determined and a display indicating that reception is not possible is performed, so that the display output of the reception status in the wireless communication device is more accurate than in the past. Can be done.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a wireless receiver according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a wireless communication system according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of a conventional wireless receiver.

[Explanation of symbols]

10: wireless transmitter, 11: wireless receiver, 12
... antenna, 13 ... wireless unit, 15 ...
CPU, 16 display unit, 17 memory
18 ... counter, 19 ... comparator,

Claims (1)

[Claims] 1. A wireless receiver for wirelessly receiving data by spread spectrum communication using a frequency hopping modulation method, wirelessly transmitting detection target data at each frequency of frequency hopping to a wireless receiver, Is counted by the counter, and the counted number is compared with the threshold value held in the memory by the comparing means. When the counted number is equal to or less than the threshold value, the display means cannot receive. A wireless receiver characterized by displaying and outputting a message.