Narrowband OFDM (NOFDM) transceiver for powerline communications (PLC)

摘要

The present invention provides a narrowband OFDM (NOFDM) system with frequency diversity redundant transmission and receiver diversity selection and combining scheme. The communication channel is segmented into independent plurality of sub-channels. The sub-channels can be used in an aggregated mode to transmit different data on every sub-channel or in a number of redundant modes, where the same data is sent on multiple sub-channels to achieve maximum robustness of communication. Redundant modes may include channel selection diversity and/or weighted channel combining diversity.

主权项

1. A method for transmitting data through a communication channel in a narrowband orthogonal frequency-division multiplexing system comprising:
dividing the communication channel into a plurality of sub-channels, each sub-channel having non-overlapping sub-carrier frequency regions with an initial phase used to generate a preamble and encode a header; modulating the data on the sub-carrier frequency regions and transmitting a copy of the same data on each of the plurality of sub-channels; passing the modulated sub-carrier frequency regions at a receiver end through a filter and a synchronizer; and selecting a sub-channel at the receiver end and demodulating the sub-carrier frequency regions of the selected sub-channel.