Patent ID: 8126066
Filing Date: 2012-02-28
Classification: H04L

Abstract:
1. A method for use in a transmitter having multiple antennas in a OFDM-based radio communications system, comprising: determining one or more known pilot symbols; determining a periodic pilot transmission pattern; forming a block of OFDM symbols that includes the one or more pilot symbols and data symbols in accordance with a predetermined pattern; using a space-time coder to perform space and time coding by assigning certain ones of the OFDM symbols to be transmitted during a particular time slot from a selected one of the multiple antennas; and transmitting OFDM symbols from the antennas, wherein the space-time coder provides a first block of multiple OFDM symbols in a first sequential order to a first antenna for transmission during a number of time slots and a second block of the same multiple OFDM symbols in a second sequential order different from the first sequential order to a second antenna for transmission during the number of time slots.