Systems and method for orthogonal frequency divisional multiplexing

A remote communication device for a bi-directional communication system, the device comprising:

• a modem that includes:
• a symbol mapper that produces at least one stream of symbols;
• an Inverse Fast Fourier Transform (IFFT) engine operating on frequency domain that receives a frame of parallel frequency domain data which is generated based on symbol data generated by the symbol mapper, the Inverse Fast Fourier Transform (IFFT) engine generating a frame of time domain in-phase and quadrature phase samples from the symbol data generated by the symbol mapper;
• at least one converter receiving the time domain in-phase and quadrature phase samples and generating an analog signal based on the time domain samples;
• and
• an amplifier that amplifies for transmission a radio frequency carrier carrying the at least one analog signal;
• and a processor that synchronizes the transmissions from the amplifier for combining with other signals.

A remote communication device, the device comprising:

• a symbol mapper that produces at least one stream of symbols;
• an Inverse Fast Fourier Transform (IFFT) engine operating on frequency domain that receives a frame of parallel frequency domain data which is generated based on symbol data generated by the symbol mapper, the Fast Fourier Transform (FFT) engine generating a frame of time domain in-phase and quadrature phase samples from the symbol data generated by the symbol mapper;
• at least one converter receiving the time domain in-phase and quadrature phase samples and generating an analog signal based on the time domain samples;
• and
• an amplifier that amplifies for transmission a radio frequency carrier carrying the at least one analog signal;
• a processor that causes transmissions from the amplifier to be orthogonal when received at a multipoint-to-point host unit.