Patent ID: 6529492
Filing Date: 2003-03-04
Classification: H04B

Abstract:
A base station for executing radio communication by using a direct sequence CDMA system with a plurality of channels in a single carrier, comprising:a separator configured to separate transmitting data into a plurality of channels; an inserter configured to periodically insert a pilot symbol into one of a plurality of channels including channels of the transmitting data; a spreader configured to spread to each channel by spreading codes assigned to the transmitting data and to the pilot symbol; a multiplexer configured to multiplex the spread transmitting data and each signal of the pilot symbol; and a transmitter configured to wirelessly transmit the multiplexed signals to a mobile station; wherein: one of a TDD transmission system and an intermittent transmission system is configured to burst transmit the transmitting data and pilot symbol separated into said plurality of channels; and said one of said TDD transmission system and said intermittent transmission system is configured to transmit a ramping signal only via a channel that includes the pilot symbol.