5 results about "Radio signal" patented technology

The present invention is a double-layer multi-carrier ultra-wideband wireless communication method, wherein the frequency band for ultra-wideband communication is divided into a plurality of sub-bands, then one or more sub-bands are used for data transmission, and the Orthogonal Frequency Division Multiplex (OFDM) multi-carrier transmission technology is used in each sub-band. In the transmitting party, the data symbols to be transmitted are allocated on M branches corresponding to the M sub-bands, and the OFDM modulation is implemented on the data symbols on each branch to obtain M branches of parallel data, then digital baseband multi-carrier modulation is implemented on the M branches of parallel data. Thereby, the spectrum of data on each branch is moved onto the digital sub-band corresponding to the radio sub-band one to one, so the digital baseband signal of the radio signal to be transmitted is obtained. Then, the digital signal is converted to an analog signal with a D / A conversion and an up-conversion, and the signal spectrum is moved to the radio frequency band in use, then the analog signal is amplified, filtered and transmitted via an antenna, thus the task of modulating M branches of parallel data onto M sub-bands is completed.

A base station including: a transmitter configured to transmit a first radio signal to a first mobile station, a receiver configured to receive a second radio signal, a processor configured to detect a second mobile station communicates with a communication device differing from the base station, based on a third radio signal from the second mobile station which is contained in the second radio signal, the first radio signal interfering with a radio communication between the second mobile station and the communication device, and to decrease transmission power of the first radio signal, on detecting the second mobile station or failing to detect the second mobile station over a first given period or longer.