Radio receiving apparatus and radio receiving method
View Patent ↗A radio receiving apparatus wherein the interference can be minimized and the power and bands can be effectively used in the process of receiving a signal comprising a combination of an impulse signal and an OFDM signal. In this apparatus, a transmission path equalizing part ( 205 ) performs a transmission path equalizing process of a signal comprising a combination of an OFDM signal and an impulse signal of UWB-IR system, and a signal separating part ( 208 ) uses a constant (C) to clip the amplitude level for a signal (Y 1 ) demodulated as the OFDM signal, and substantially clips only the signal components of the impulse signal. Further, only when a signal (Y 2 ) demodulated as the impulse signal exhibits an amplitude level greater than the constant (C), it is outputted, while most of the signal power of the combined OFDM signal is removed.
1. A radio receiving apparatus comprising:
a receiving section that receives a composite signal combining an impulse signal of an impulse type ultrawideband scheme and an orthogonal frequency division multiplexing signal of an orthogonal frequency division multiplexing scheme; and
a demultiplexing section that demultiplexes the composite signal received by the receiving section into the impulse signal and the orthogonal frequency division multiplexing signal according to an amplitude level of the composite signal.
2. The radio receiving apparatus according to claim 1 , wherein the demultiplexing section performs threshold decision between the amplitude level of the composite signal and a predetermined threshold value, and, in the composite signal, demultiplexes a signal having an amplitude level exceeding the threshold value as the impulse signal, and demultiplexes a signal where an amplitude level exceeding the threshold value is clipped at the threshold value and a signal having an amplitude level less than the threshold value as the orthogonal frequency division multiplexing signal.
3. The radio receiving apparatus according to claim 1 , further comprising an orthogonal frequency division multiplexing signal canceling section that cancels the orthogonal frequency division multiplexing signal in the composite signal as an interference component.
4. The radio receiving apparatus according to claim 1 , further comprising an impulse signal canceling section that cancels the impulse signal in the composite signal as an interference component.
5. The radio receiving apparatus according to claim 1 , further comprising:
an orthogonal frequency division multiplexing signal canceling section that cancels the orthogonal frequency division multiplexing signal in the composite signal as an interference component; and
an impulse signal canceling section that cancels the impulse signal in the composite signal as an interference component,
wherein a plurality of the orthogonal frequency division multiplexing signal canceling sections and the impulse signal canceling sections are alternately connected.
6. A radio receiving method comprising:
a receiving step of receiving a composite signal combining an impulse signal of an impulse type ultrawideband scheme and an orthogonal frequency division multiplexing signal of an orthogonal frequency division multiplexing scheme; and
a demultiplexing step of demultiplexing the composite signal received in the receiving step into the impulse signal and the orthogonal frequency division multiplexing signal according to an amplitude level of the composite signal.