A Method for Jointly Adapting an OFDM Waveform and the Demodulator for Interference Mitigation and Harsh Channels

This technology allows OFDM-based data links the ability to communicate in the presence of interference, or when interference avoidance is not possible. If the interference is unavoidable, this method provides protection to the physical layer of a communications link. An example of this application would be the protection of control channels in cellular radio, given the vulnerability of LTE to interference [1]. It can also be a waveform for Dynamic Spectrum Access (DSA) for white space spectrum where resilience to interference is a necessary condition and complete interference avoidance may not be possible. The waveform can be designed such that it incorporates the parameters of the interference to improve its resilience while still maintaining a link without notching spectrum that is being occupied. A similar benefit can be had in the presence of a multipath channel. By incorporating knowledge about the channel into the waveform, a data link can be established in harsh interference where communication would not otherwise be possible. This technique provides an alternative to Hybrid ARQ-based transmissions that require retransmission which incur a latency penalty.


[1] Marc Lichtman, “Vulnerability to LTE to Hostile Interference”, IEEE Global Conference on Signal and Information Processing, December 2013



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