FIELD: radio engineering, communication.
SUBSTANCE: transmitter generates multiple composite pilots using a training matrix and a gain matrix. Each composite pilot includes multiple training pilots generated by multiple columns of the training matrix and scaled by multiple gain elements in a column of the gain matrix. The transmitter transmits each composite pilot via multiple transmit antennae. A MISO receiver obtains received symbols for the multiple composite pilots and derives an estimate of a composite MISO channel. For an OFDM system, the MISO receiver derives an initial impulse response estimate for each composite pilot, filters the initial impulse response estimates for all composite pilots, and derives a frequency response estimate for the composite MISO channel. A MIMO receiver obtains and processes received symbols for the multiple composite pilots based on the training and gain matrices and derives channel estimates for individual SISO channels between the multiple transmit antennae and multiple receive antennae.
EFFECT: efficient pilot transmission in a multiple-antenna system.
46 cl, 12 dwg
