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METHOD AND APPARATUS USING CELL-SPECIFIC AND COMMON PILOT SUBCARRIERS IN MULTI-CARRIER, MULTI-CELL WIRELESS COMMUNICATION NETWORKS

  • US 20200136876A1
  • Filed: 06/13/2019
  • Published: 04/30/2020
  • Est. Priority Date: 01/29/2004
  • Status: Abandoned Application
First Claim
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1. A transmitting method for a base station in a cell within a group of cells in an orthogonal frequency division multiplexing system, the base station having multiple transmission branches, the method comprising:

  • transmitting cell-specific pilot subcarriers, in accordance with a transmission diversity scheme or a multiple-input multiple-output scheme, wherein some of the cell-specific pilot subcarriers are not aligned in frequency subcarrier index with cell-specific pilot subcarriers transmitted by another base station in the group of cells;

    transmitting common pilot subcarriers in accordance with a common pilot transmission scheme, wherein;

    the common pilot subcarriers are aligned in frequency subcarrier index with common pilot subcarriers transmitted by other base stations in the group of cells;

    a ratio of an amplitude (ai,m and an,m) of two common pilot subcarriers having a same time index (tk) that are transmitted via a common transmission branch is a constant for the group of cells; and

    a difference of a phase (φ

    i,m and φ

    n,m) of two common pilot subcarriers having a same time index (tk) that are transmitted via a common transmission branch is a constant for the group of cells; and

    controlling independently a transmission power of the cell-specific pilot subcarriers and a transmission power of the common pilot subcarriers.

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