Wireless communication system, receiver, elevator control system and substation equipment control system

Abstract

The objective of the invention is to increase information amount that can be wirelessly transferred per frequency band in a dual-channel wireless communication system. A wireless communication system comprises a transmitter (10) and a receiver (30). The transmitter (10) comprises: a baseband circuit (12) for outputting information signals; a frequency converter circuit (20-1) for converting the frequency of the output signals to the band of a frequency f1; a frequency converter circuit (20-2) for converting the frequency of the output signals to the band of a frequency f2; and transmission antennas (15-1, 15-2) for transmitting the output signals of the frequency converter circuits (20-1, 20-2), respectively, as electromagnetic waves. The receiver (30) comprises: a reception antenna (31) for receiving the electromagnetic waves transmitted by the transmitter (10); and a converter circuit (32) that samples the received signals by use of a sampling frequency fs, which is obtained by adding the frequencies f1 and f2 together and further dividing the sum by any one of odd numbers, and then demodulates the sampled received signals into the information signals.

Description

technical field [0001] The present invention relates to a high-reliability wireless communication long-life wireless device, and more particularly to a technique for realizing a wireless system and a receiver constituting the same system that improve the reliability of communication by duplexing wireless lines. Background technique [0002] In recent years, wireless communication technology has been significantly developed in the field of broadcasting and communication, and has gradually overcome problems such as wireless-specific instantaneous disconnection. As a result, wireless communication technology is being applied to the control field or measurement field that requires higher reliability than the broadcast field or communication field. [0003] In particular, devices that construct social infrastructure in the field of control or measurement (hereafter referred to as "social infrastructure devices.") Compared with general consumer equipment in the field of broadcasti...

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Problems solved by technology

Although the upper limit of the sampling frequency of the semiconductor element is increasing day by day due to the high speed of the semiconductor element, the current situation is that the upper limit of the sampling frequency of the digital signal processing equipment that can be obtained as a product is several 100MHz, which is relatively long-distance in space. The frequency of the electromagnetic wave that propagates cannot be called a sufficiently high frequency

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