Communication device and communication system

摘要

A communication device includes: a reception element for receiving a radio signal modulated in a first modulation scheme or a second modulation scheme; a first demodulation element for demodulating the received radio signal in a first demodulation scheme corresponding to the first modulation scheme; a second demodulation element for demodulating the received radio signal in a second demodulation scheme corresponding to the second modulation scheme; and a modulation scheme detection section for detecting a modulation scheme of the received radio signal. The received radio signal includes modulation scheme determination information. The modulation scheme detection section detects the modulation scheme of the received radio signal based on a result of demodulation of the modulation scheme determination information performed by the first demodulation element and a result of demodulation of the modulation scheme determination information performed by the second demodulation element.

主权项

1. A communication device comprising:
a reception element that receives a radio signal modulated in a first modulation scheme or a second modulation scheme from a communication partner device, said radio signal including a preamble portion at a beginning of the radio signal followed by a data portion; a storage element that stores said radio signal received by said reception element; a demodulation element that performs a demodulation process on said radio signal outputted from said storage element; a control element that implements any one of a first demodulation scheme and a second demodulation scheme in said demodulation element by controlling setting of said demodulation element, said first demodulation scheme corresponding to said first modulation scheme and said second demodulation scheme corresponding to said second modulation scheme; and a modulation scheme detection element that detects a modulation scheme of said radio signal, wherein said preamble portion of said radio signal includes a modulated message that corresponds to predetermined information supplied to the communication device, said control element sequentially implements said first demodulation scheme and said second demodulation scheme by itself without receiving, by said reception element, instructions from said communication partner device, and said modulation scheme detection element detects the modulation scheme of said radio signal based on results of demodulation of said preamble portion that are sequentially obtained by demodulation according to said first demodulation scheme and said second demodulation scheme.