| 摘要 |
The invention relates to a communication device, and in particular to a radio transmitter and a receiver that can operate with low power consumption and with improved interference rejection, therefore particularly suitable for use in low-power communication systems, such as wireless sensor networks and wireless body area networks. Multiple frequency tones are used to carry information from the transmitter, such that a RF signal comprising multiple radio frequency components is produced and transmitted. In the receiver, an envelope detector is still the RF down-converter. After down-converting intermodulation components are extracted containing phase and frequency information of the multiple carriers. This allows the desired signal (the baseband information) to be distinguished from the carriers and unwanted interference. |
