×

Distributed multi-drop base station/repeating unit using extension of analog optical transmission in mobile communication system

  • US 7,221,906 B2
  • Filed: 03/26/2003
  • Issued: 05/22/2007
  • Est. Priority Date: 01/10/2003
  • Status: Expired due to Fees
First Claim
Patent Images

1. A distributed multi-drop base station unit using an extension of analog optical transmission in a mobile communication system, comprising:

  • a main unit for performing functions of a mobile communication base station, the functions including a function of converting an analog radio frequency (RF) signal into an optical signal and transmitting the converted optical signal, a function of receiving an optical signal and converting the received optical signal into an analog RF signal, a modulation/demodulation function, an intermediate frequency (IF)/RF conversion function, and an encoding/decoding function; and

    a plurality of remote units cascaded to the main unit on a sector basis, each of the remote units being adapted to, in a forward mode, receive a first optical signal, perform a first photoelectric conversion operation for the first optical signal to create a first electrical RF signal, split the first electrical RF signal into a second electrical RF signal and a third electrical RF signal, amplify the second electrical RF signal, perform a first electrophotic conversion operation for the amplified second electrical RF signal to create a second optical signal, transmit the second optical signal, amplify the third electrical RF signal and transmit the amplified third electrical RF signal to an associated terminal, and to, in a backward mode, receive a third optical signal, perform a second photoelectric conversion operation for the third optical signal to create a fourth electrical RF signal, amplify the fourth electrical RF signal, receive a fifth electrical RF signal from the associated terminal, couple the amplified fourth electrical RF signal with the fifth electrical RF signal to create a coupled electrical RF signal, perform a second electrophotic conversion operation for the coupled electrical RF signal to create a fourth optical signal, and transmit the fourth optical signal.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×