ENHANCED MODULATOR AND DEMODULATOR

摘要

Embodiments of this invention describe a method to reduce the effective inter carrier spacing between the sub-carriers of wireless, wired or optical transmissions and thereby increase the spectral efficiency of the communication system. Signal transmitted from multiple transmit chains are shifted in frequency at the transmitter. At the receiver a plurality of receive chains is used, the received signals are similarly shifted in frequency and used to reduce the inter carrier interference. Embodiments also describe a method for Full Duplex communication where the transmitters transmit using different frequency shifts. The receiver receives the transmitted signal and an echo of it's transmission. As the received transmission is shifted in frequency from it's transmission, it can cancel out the echo and receive the intended signal.

主权项

1. An apparatus comprising of a transmit circuit capable of generating a plurality of baseband signals indicative of one or more symbols; shifting some or all of the baseband signals so that they occupy different frequencies and then combining the signals, RF modulating the signal; transmitting the modulated communication signal;