发明名称 |
Polarization-angle-division diversity wireless transmitter, wireless receiver, and wireless communication system |
摘要 |
A wireless transmitter has a modulator modulating an information signal of a frequency f1 by a carrier wave of a frequency f2 to output a first modulated signal, a transmitting antenna transmitting the first modulated signal using a linearly polarized wave, and a motor rotating the transmitting antenna at a frequency f3 to rotate the outgoing linearly polarized wave at the frequency f3 thereby multiplexing the first modulated signal with a linearly polarized wave component and a horizontally polarized wave component, the two components being independent of each other. A wireless receiver has diversity receiving antennas receiving the signal on a plurality of polarization planes to obtain a plurality of input signals; a path difference phase shifter compensating each of the input signals for the phase shift stemming from path differences, and a composer composing the corrected received signals. |
申请公布号 |
US9407349(B2) |
申请公布日期 |
2016.08.02 |
申请号 |
US201114002521 |
申请日期 |
2011.03.09 |
申请人 |
HITACHI, LTD. |
发明人 |
Takei Ken |
分类号 |
H04B7/02;H04B7/10;H04B7/08 |
主分类号 |
H04B7/02 |
代理机构 |
Volpe and Koenig, P.C. |
代理人 |
Volpe and Koenig, P.C. |
主权项 |
1. A polarization-angle-division diversity wireless communication system including a wireless receiver for receiving an electromagnetic wave transmitted from a polarization-angle-division diversity wireless transmitter, the receiver including:
a first receiving antenna which receives a first polarized wave from the polarization-angle-division diversity wireless transmitter to obtain a first input signal; a second receiving antenna which receives a second polarized wave from the polarization-angle-division diversity wireless transmitter to obtain a second input signal; a first rotational frequency detecting unit to block frequencies at least twice as high as a third frequency in the first signal to generate a first received signal; a second rotational frequency detecting unit to block frequencies at least twice as high as the third frequency in the second input signal to generate a second received signal; a multi-delay composer configured to delay and to compose the first received signal and the second received signal; and the polarization-angle-division diversity wireless transmitter including: an electromagnetic wave transmitting unit configured to transmit first and second independent circularly polarized waves, wherein the electromagnetic wave transmitting unit comprises: a first modulator configured to modulate an information signal having a first frequency by a second frequency to output a first modulated signal; a second modulator configured to modulate the first modulated signal by the third frequency to obtain a first output signal; a first transmitter which transmits the first output signal using the first circularly polarized wave; a phase shift circuit configured to shift a phase of the third frequency by 90 degrees; a third modulator configured to modulate the first modulated signal by the shifted phase of the third frequency to obtain a second output signal; and a second transmitter which transmits the second output signal using the second circularly polarized wave. |
地址 |
Tokyo JP |