Patent ID: 7974179

Claim:
A receiving apparatus for use with an orthogonal frequency division multiplexing (OFDM) communications system, comprising: a unit which receives a transmit symbol to which are multiplexed a unicast channel, a multimedia broadcast multicast service (MBMS) channel, a specific pilot channel specific to a specific cell, and one or more common pilot channels common to a plurality of cells; a unit which determines one or more first type of channel estimation values for each of one or more sub-carriers into which the one or more common pilot channels are inserted; a unit which determines a second type of channel estimation value for each of the one or more sub-carriers into which the one or more specific pilot channels are inserted; and a unit which derives a non-desired signal component from a difference between a channel estimation value for a certain sub-carrier that is derived from the one or more first type of channel estimation values, and the second type of channel estimation values for the sub-carrier, and derives a channel quality indicator (CQI) for the sub-carrier.