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- W4387076193 abstract "In multiple-input multiple-output (MIMO) wireless systems with frequency-flat channels, a single-antenna jammer causes receive interference that is confined to a one-dimensional subspace. Such a jammer can thus be nulled using linear spatial filtering at the cost of one degree of freedom. Frequency-selective channels are often transformed into multiple frequency-flat subcarriers with orthogonal frequency-division multiplexing (OFDM). We show that when a single-antenna jammer violates the OFDM protocol by not sending a cyclic prefix, the interference received on each subcarrier by a multi-antenna receiver is, in general, not confined to a subspace of dimension one (as a single-antenna jammer in a frequency-flat scenario would be), but of dimension L, where L is the jammer's number of channel taps. In MIMO-OFDM systems, a single-antenna jammer can therefore resemble an L-antenna jammer. Simulations corroborate our theoretical results. These findings imply that mitigating jammers with large delay spread through linear spatial filtering is infeasible. We discuss some (im)possibilities for the way forward." @default.
- W4387076193 created "2023-09-27" @default.
- W4387076193 creator A5004587877 @default.
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- W4387076193 date "2023-09-25" @default.
- W4387076193 modified "2023-09-28" @default.
- W4387076193 title "Single-Antenna Jammers in MIMO-OFDM Can Resemble Multi-Antenna Jammers" @default.
- W4387076193 doi "https://doi.org/10.48550/arxiv.2309.14059" @default.
- W4387076193 hasPublicationYear "2023" @default.
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