Programmable modem apparatus for transmitting and receiving digital data, design method and use method for the modem

A system for transmitting and receiving signals, comprising:

• a digital integrated circuit having a transmitter which generates first baseband signals, said transmitter having a first plurality of circuits comprising a converter coupled to receive parallel input data signals and which converts said parallel input data to serial data, a spreader, an over-sampling filter, a gain control, and an up-converter which converts said first baseband signals to first intermediate frequency signals;
• a receiver having a plurality of circuits to generate a plurality of output data signals, said plurality of circuits comprising a down-converter to convert second signals at an intermediate frequency to second baseband signals, a decimating filter, a gain control, and a correlator which generates said plurality of output data signals;
• a clock generator coupled to said transmitter and said receiver, said clock generator having at least one numerically controlled oscillator;
• at least one memory mapped memory which provides storage locations for programming of said digital integrated circuit;
• a phase error measuring module which measures a phase error between an external signal and one of said plurality of output data signals;
• a processor coupled to said digital integrated circuit, said processor writing parameters to said storage locations and reading said plurality of output data signals and the phase error;
• and
• a memory mapped interface coupled between said processor and said digital integrated circuit.