A method for decreasing the multipath interference in digital data transmission over wireless radio channels and its implementation on single chip microcontroller as a wireless data encoder

Frequency division multiplexing (FDM) is a technology that transmits multiple signals simultaneously over a single transmission path, such as a cable or wireless system. Each signal travels within its own unique frequency range (carrier), which is modulated by the data (text, voice, video, etc.). For multimedia implementations, consider the more efficient and robust OFDM (orthogonal frequency division multiplexing). OFDM, sometimes referred to as multi-carrier or discrete multi-tone modulation, utilizes multiple sub-carriers to transport information in from one particular user to another. In this publication we present a digital OFDM wireless encoder based on single chip microcontroller. The benefits of OFDM are high spectral efficiency, resiliency to RF interference, and lower multi-path distortion. The orthogonal nature of OFDM allows sub-channels to overlap, having a positive affect on spectral efficiency.