Patent ID: 7430256

Claim:
A channel state measurement apparatus for a receiver, comprising: a direct channel state measurement unit adapted to receive complex symbol streams, adapted to perform de-mapping on the complex symbol streams, adapted to calculate an error signal based on the received complex symbol streams and de-mapped complex symbol streams, and adapted to generate direct channel state information based on the calculated error signal; an indirect channel state measurement unit adapted to generate indirect channel state information based on a magnitude of a channel frequency response; a co-channel interference detection unit adapted to generate a channel state selection control signal based on the calculated error signal and the magnitude of the channel frequency response; and a selection unit adapted to selectively output one of the direct channel state information and the indirect channel state information based on a logic state of the channel state selection control signal; wherein the co-channel interference detection unit detects co-channel interference using: a value calculated by multiplying a square of the magnitude of the channel frequency response and the error signal; and at least one coefficient information; and wherein the co-channel interference detection unit generates the channel state selection control signal based on a result of the detection.