All data symbols used in data transmission of a modulated signal are precoded by switching
between precoding matrices so that the precoding matrix used to precode each data symbol …

(57) ABSTRACT A transmission method simultaneously transmitting a first modulated signal
and a second modulated signal at a common frequency performs precoding on both signals …

It is an object of the present invention to provide an adap tive modulation method and an
coding rate control method for a radio communication system, wherein the former method …

It is an object of this invention to provide a modula tion system which is capable of improving
a transmis sion spectrum of transmission signal by compensating for nonlinearities of an …

A receiving circuit mainly available in a digital modulation type communication system
having a plurality of channels, which is capable of reducing power in a receiving system …

A receiving circuit mainly available in a digital modulation type communication system
having a plurality of channels, which is capable of reducing power in a receiving system …

A transmission system for transmitting digital symbols by modulation according to a phase
constellation includes a transmitter having a phase modulator and a frequency multiplier in …

[57] ABSTRACT A signal processing device is arranged to form a? rst output modulated
signal by modulating an input infor mation signal in accordance with a modulation carrier …

There are several principal modulation methods for elec tromagnetic signals used in
communications. The ones that are most widely used are frequency modulation (FM) …

In a transmission apparatus which multicarrier-modulates and transmits symbols, which are
basic units of digital sig nals, a Subcarrier in which a symbol is arranged in a first multicarrier …