Patent ID: 7391715
Filing Date: 2008-06-24
Classification: H04L

Abstract:
1. A transmitter device for communicating with a plurality of receiver devices in a cell through radio channels, said transmitter device comprising: an OFDM transmission means; a MC-CDMA transmission means; and a control means for selecting either said OFDM transmission means or said MC-CDMA transmission means at a slot time assigned to a receiver device in response to propagation conditions for the receiver device, wherein said propagation conditions are a distance from said receiver device and a ratio of carrier power to interference signal power and noise power; and said control means selects said OFDM transmission means when the distance is short and the ratio of carrier power to interference signal power and noise power is high, and said MC-CDMA transmission means when the distance is long or the ratio of carrier power to interference signal power and noise power is low.