Wireless receiver, method for controlling the wireless receiver, and semiconductor integrated circuit
A wireless receiving and wireless transmitter technology, applied in radio transmission systems, electrical components, multiplexing communications, etc., can solve problems such as the inability to sufficiently reduce the bit error rate, the difficulty of the system to accurately estimate the propagation channel, and the deterioration of reception quality, etc. question
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no. 1 example
[0022] Fig. 1 is a block diagram showing an OFDM receiver 1 of a first embodiment of the present invention.
[0023] The OFDM receiver 1 of the first embodiment has an antenna for receiving an OFDM signal transmitted from a transmission station (not shown); a front-end part for synchronizing an OFDM reception signal received by the antenna 105 and an OFDM transmission signal transmitted from the transmission station 100; and a decoded data extraction section 200 for extracting decoded data from the OFDM signal received by the front end section 100.
[0024] figure 2 Shows the structure of an OFDM signal.
[0025] An OFDM signal in frame format consists of OFDM symbols serving as data segments to be transmitted and a guard interval portion in which a unique word is written. A substantial requirement for the unique word is a weak cross-correlation with the OFDM symbols. In this embodiment, the unique word is described as corresponding to the PN sequence which is a pseudo-sequ...
no. 2 example
[0103]The difference between the second embodiment and the first embodiment is that two antennas are provided to realize a diversity structure. In the case of an actual propagation channel, distortion originating from multipath occurs in the propagation channel. Moreover, chronological variations (Doppler shift and Doppler spread) etc. are necessarily accompanied in the propagation channel in the presence of relative motion between the transmitting station and the receiving station. In such a propagation channel, when a received waveform is observed along the frequency axis or the time axis, there arises a case where the received power fluctuates significantly due to distortion in the propagation channel.
[0104] Consequently, uncorrectable errors often occur in the signal received by the antenna. However, when a structure for receiving radio waves by a plurality of antennas is employed, even if an uncorrectable error occurs in a signal received by one antenna, the other ant...
no. 3 example
[0113] The decoded data candidate signals from the respective functional blocks 10a and 10b of the OFDM receiver 2 of the second embodiment are used as reference signals used when the respective equalization processing sections 230a and 230b estimate propagation channels. Also, for example, the decoded data output by the selection section 280 is used as a reference signal used when the respective equalization processing sections 230a and 230b estimate the propagation channel.
[0114] FIG. 11 is a block diagram showing the structure of the OFDM receiver 3 of the third embodiment.
[0115] The OFDM receiver 3 of the third embodiment has an antenna 105a, a receiving part 110a, an ADC 120a, an AFC 130a, a CPE 140a, a resampler 150a, a symbol synchronization part 160a, an ISI canceller 210a, an FFT 220a, an equalization processing part 230a, Functional block 20a of outer decoder 240a and inner decoder 250a. The OFDM receiver 3 of the third embodiment has an antenna 105b, a receiv...
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