 Apparatus and method for transmitting bit synchronous data over an unreliable channel |
| OF A PREFERRED EMBODIMENT A system which utilizes bit synchronicity for a radiotelephone system ... |
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| TFO resynchronization system |
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| Optical data bus having a statistical access method |
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| Circuit and method for signal transmission |
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| Non-volatile RAM cell with enhanced conduction insulators |
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| Target location systems |
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| Multiple bit output dynamic random-access memory |
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| Autonomous N-modular redundant fault tolerant clock system |
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Spread spectrum receive apparatus
| Details |
Inventors: Shoki, Hiroki; Suzuki, Yasuo;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Pham; Chi
Assistant Examiner: Tran; Khanh Cong
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
This invention is a spread spectrum receive apparatus comprising a plurality of receive branches, wherein each of the plurality of receive branches includes at least one antenna which receives a plurality of different polarized components, and a RAKE receiver, commonly prepared for the plurality of receive branches, for modulating the plurality of different polarized components received, and outputting a modulated signal based on the plurality of different polarized components modulated. |
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DETAILED DESCRIPTION OF THE INVENTION The embodiments of the present invention will be described below with reference to the views of the accompanying drawing.
FIRST EMBODIMENT FIG.
2 shows an example of the arrangement of a spread spectrum receive apparatus according to the first embodiment of the present invention.
This spread spectrum receive apparatus is to be installed in a base station or mobile terminal in a mobile communication system such as a digital cellular mobile communication system used for portable telephones or the like.
The apparatus is mainly comprised of two antennas 11 and 12, RF receive circuits 13 and 14 respectively connected to the antennas 11 and 12, A/D converters 15 and 16 for converting received signals from the RF receive circuits 13 and 14 into digital signals, a RAKE receiver 17 for receiving the signals output from the A/D converters 15 and 16, and a decoder 23.
In this case, the antennas 11 and 12 have the functions of receiving different polarized components of radio waves arriving at the base station or mobile terminal.
For example, the antennas 11 and 12 respectively receive vertical and horizontally polarized waves.
Although these antennas 11 and 12 are separately prepared, they may be integrated into one unit, as will be described later.
The received signals of the respective polarized components received by the antennas 11 and 12 are respectively input to the RF receive circuits 13 and 14.
For example, the RF receive circuits 13 and 14 amplify the received signals by using low-noise amplifiers (LNAs), select desired frequency components by using bandpass filters (BPFS) or the like, and perform frequency conversion from the radio frequency (RF) band to the intermediate frequency (IF) band or the baseband (BB).
As described above, in this embodiment, the antennas 11 and 12 and the RF receive circuits 13 and 14 connected thereto constitute two receive branches.
The received signals from these two receive branches, i.
e.
, the received signals in the IF or BB band output from the RF receive circuits 13 and 14, are respectively converted into digital signals by the A/D converters 15 and 16
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Fault Detection 
