Patent ID: 8291275
Filing Date: 2012-10-16
Classification: H04B,H04L,H04W

Abstract:
1. A transmission apparatus which transmits and retransmits data by employing a cyclic diversity in a communication system wherein data are spatially multiplexed using a plurality of antennas and wherein communications are performed by orthogonal frequency division multiplexing, comprising: a symbol generation portion which multiplexes data by orthogonal frequency division multiplexing, and assigns the plurality of antennas to the data to generate symbols of respective antennas; a cyclic delay controller which sets a plurality of delay magnitudes different for the respective antennas, for each predetermined timing; a cyclic delayer which cyclically delays the individual symbols of the respective antennas, in accordance with the plurality of delay magnitudes set by said cyclic delay controller; a transmission portion which outputs the cyclically delayed symbols to the antennas; and a random number generator which generates the plurality of delay magnitudes which are random or dispersed, wherein said cyclic delay controller sets the plurality of delay magnitudes from said random number generator, in said cyclic delayer for each predetermined timing, wherein as the delay magnitudes, a first delay magnitude at a first transmission timing and a second delay magnitude at a second transmission timing are different for one antenna, and the delay magnitudes are different in the respective antennas for one transmission timing.