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Single wavelength bi-directional RoF link apparatus or signal transmission in TDD wireless system

  • US 7,773,887 B2
  • Filed: 12/20/2006
  • Issued: 08/10/2010
  • Est. Priority Date: 05/03/2006
  • Status: Active Grant
First Claim
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1. A single wavelength bi-directional Radio over Fiber (RoF) link apparatus for signal transmission in a Time Division Duplexing (TDD) wireless system, the RoF link apparatus comprising:

  • a main donor comprising a receiving unit a transmission unit, the receiving unit for;

    receiving a Radio Frequency (RF) signal of downstream data from an upper layer,electro-optic converting the received RF signal to an optical signal, andtransmitting the converted optical signal via an optical fiber in response to a TDD switching signal received from an upper layer; and

    the transmission unit for;

    receiving an optical signal of upstream data via the optical fiber,opto-electric converting the received optical signal to an RE signal in response to the TDD switching signal received from the upper layer, andtransmitting the converted optical signal to the main donor; and

    a remote comprising a receiving unit and transmission unit, the remote receiving unit;

    receiving the optical signal of the downstream data via the optical fiber from the main donor,opto-electric converting the received optical signal to an RE signal, andemitting the converted RF signal to a terminal via an antenna in response to a TDD switching signal generated by a switch timing signal generation circuit, and the remote transmission unit forreceiving an RF signal of upstream data from the terminal,electro-optic converting the received RF signal to an optical signal in response to the TDD switching signal generated by the switch timing signal generation circuit, andtransmitting the converted optical signal to the main donor via the optical fiber;

    wherein the remote comprises;

    an optical circulator for receiving the optical signal of the downstream data via the optical fiber and the optical signal of the upstream data from an optical switch and controlling output paths of the optical signal of the downstream data and the optical signal of the upstream data;

    an optical receiver (Rx2) for receiving the optical signal of the downstream data opto-electric converting the optical signal of the downstream data to an RF signal and outputting the converted RF signal;

    a high power amplifier HPA for receiving the RF signal of the downstream data from the Rx2, amplifying the RF signal and transmitting the amplified RF signal;

    a switch timing signal generation circuit for receiving a portion of the RE signal of the downstream data from the Rx2, generating a TDD switching signal, and outputting the generated TDD switching signal;

    an electrical switch for receiving the RF signal of the downstream data from the HPA and the RF signal of the upstream data from the terminal and selectively providing a path of the RF signal of the downstream data or the RF signal of the upstream data by controlling the opening and closing thereof in response to the TDD switching signal generated by the switch timing signal generation circuit;

    a low noise amplifier LNA, for receiving the RF signal of the upstream data from the electrical switch, substantially canceling a noise component of the RF signal, amplifying a signal component of the RE signal, and outputting the noise-cancelled and signal-amplified RF signal;

    an optical transmitter (Tx2) for receiving the RF signal of the upstream data from the LNA, electrooptic converting the received RF signal to an optical signal, and outputting the converted optical signal; and

    an optical switch for receiving the optical signal of the upstream data from the Tx2 and providing the optical signal of the upstream data to the optical circulator by controlling the opening and closing thereof in response to the TDD switching signal generated by the switch timing signal generation circuit.

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