Base station apparatus, communication terminal apparatus, and communication method

Abstract

Based on the determination of a transmission destination determination section 106, a data selector 151 selects only transmit data for the corresponding communication terminal apparatus. An adaptive modulation section 153 modulates the output signal from the data selector 151 using the modulation method indicated by a modulation method determination section 152. A spreading section 154 spreads the output signal from the adaptive modulation section 153 and outputs the resulting signal to a code multiplexer 158. A dedicated pilot signal generator 155 generates a dedicated pilot signal. A modulation section 156 modulates the dedicated pilot signal. A spreading section 157 spreads the output signal from the modulation section 156 and outputs the resulting signal to the code multiplexer 158. The code multiplexer 158 performs code multiplexing of the output signal from the adaptive spreading section 154 and the output signal from the spreading section 157 and outputs the resulting signal to a time multiplexer 162. By this means it is possible to maintain data-part reception quality when performing high-speed downlink packet transmission even when phase changes are sudden.

Dependencies are inferred from the claim text.