US Patent No. 9,749,102

OFDM FRAME TRANSMISSION METHOD AND APPARATUS


Patent No. 9,749,102
Issue Date August 29, 2017
Title Ofdm Frame Transmission Method And Apparatus
Inventorship Yutaka Murakami, Osaka (JP)
Masayuki Orihashi, Kanagawa (JP)
Akihiko Matsuoka, Kanagawa (JP)
Yoichi Nakagawa, Tokyo (JP)
Assignee Optis Wireless Technology, LLC, Plano, TX (US)

Claim of US Patent No. 9,749,102

1. A transmission method comprising:
generating a first orthogonal frequency division multiplexing (OFDM) frame signal including a grid of multiple frequency subcarriers
and multiple time periods, where an OFDM symbol is transmitted using multiple frequency subcarriers during a time period,
and including known reference OFDM symbols assigned to corresponding time-frequency resource elements in the grid, each resource
element being defined by a one of the multiple frequency subcarriers and one of the multiple time periods;

generating a second orthogonal frequency division multiplexing (OFDM) frame signal including a grid of multiple frequency
subcarriers and multiple time periods and including known reference OFDM symbols assigned to corresponding time-frequency
resource elements in the grid,

wherein the time-frequency resource elements in the grid assigned to the known reference OFDM symbols in the first OFDM frame
signal are different from the time-frequency resource elements in the grid assigned to the known reference OFDM symbols in
the second OFDM frame signal;

converting the first OFDM frame signal to a first radio signal and the second OFDM frame signal to a second radio signal;
and

transmitting the first radio signal from a first antenna and the second radio signal from a second, different antenna.