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System and method for providing external receiver gain compensation when using an antenna with a pre-amplifier

  • US 8,811,925 B2
  • Filed: 06/10/2009
  • Issued: 08/19/2014
  • Est. Priority Date: 06/10/2009
  • Status: Active Grant
First Claim
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1. A communications system configured to improve a noise figure (NF) of a time division duplex (TDD) communications system, the system comprising:

  • a pre-amplified antenna unit comprising a first plurality of antennas and first associated low-noise amplifiers (LNA) contained therein, each of said first associated LNA'"'"'s being arranged to receive a signal from a first phase-matched pair of antennas selected from the plurality of antennas; and

    a variable gain circuit coupled to a TDD output signal of at least one of the first associated LNA'"'"'s, wherein the variable gain circuit is configured to provide a selected negative gain to the TDD output signal, wherein the selected negative gain ensures that an output signal from the variable gain circuit is suitable for application to a remote radio head (RRH) input such that a dynamic range of the RRH input is not reduced below a desired dynamic range.

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