MIMO-OFDM transmitter
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Example
First Embodiment
[0051]A system, which combines MIMO with OFDM in a first embodiment, is configured by a MIMO-OFDM transmitter having a plurality of transmitting antennas and a MIMO-OFDM receiver having a plurality of receiving antennas as illustrated in FIG. 19 in the prior art.
[0052]>
[0053]FIG. 1 is a diagram showing the MIMO-OFDM transmitter in the first embodiment of the present invention. The MIMO-OFDM transmitter in the first embodiment includes a serial / parallel converting unit 101, an inverse fast Fourier transform operation unit 102, a plurality of OFDM data signal transmitting units 120, a direct spreading pilot signal transmitting unit 130 and a plurality of transmitting antennas 107. The OFDM data signal transmitting units 120 has a guard interval inserting unit 103, a digital / analog converting unit 104, an up-converting unit 105 and an amplifier 106. The direct spreading pilot signal transmitting unit 130 has a direct spreading pilot signal generating unit.
[0054]The se
Example
Second Embodiment
[0073]Next, a second embodiment of the present invention will be described. The second embodiment has the same configuration as of the first embodiment, and hence the description thereof will be focused mainly on a different point, while the explanations of the common points are omitted.
[0074]>
[0075]FIG. 6 is a diagram showing a direct spreading pilot signal generating unit 700. The OFDM transmitter in the second embodiment has the same configuration of the MIMO-OFDM transmitter in the first embodiment except a point that the direct spreading pilot signal generating unit has a different configuration.
[0076]The direct spreading pilot signal generating unit 700 includes a direct spreading code generating unit 710, a multiplying unit 703 that multiplies, by the pilot data, the direct spreading code generated by the direct spreading code generating unit 710, a phase shifting unit 707 and a guard interval inserting unit 705. The direct spreading pilot signals generated by t
Example
Third Embodiment
[0090]Next, a third embodiment of the present invention will be described. The third embodiment has the same configuration as of the first embodiment, and hence the description thereof will be focused mainly on a different point, while the explanations of the common points are omitted.
[0091]>
[0092]FIG. 10 is a diagram showing a direct spreading pilot signal generating unit 900. The OFDM transmitter in the third embodiment has the same configuration of the MIMO-OFDM transmitter in the first embodiment except a point that the direct spreading pilot signal generating unit has a different configuration. The direct spreading pilot signal generating unit 900 includes a direct spreading code generating unit 910, a multiplying unit 903 that multiplies, by the pilot data, the direct spreading code generated by the direct spreading code generating unit 910, a phase shifting unit 907 and a guard interval inserting unit 905. The direct spreading pilot signals generated by the direc
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