We propose a scheme which generates shared secret
keys from the amplitude of frequency domain channel state
information (CSI) of individual orthogonal frequency-division
multiplexing (OFDM) subcarrier. A unique quantization scheme
is proposed, with the use of two parameters, α and β, to set the
quantization threshold. Based on multivariate Rayleigh
distribution, we derive the analytical expressions for key bit
disagreement rate (BDR) and key length. The theoretical analysis
of BDR and key length aligns with the simulation results. We also
present a mathematical model to optimize the parameters of our
proposed quantization scheme and a guideline to set and .
Our proposed method for iterative tuning of can balance the
number of zeros and ones in the generated key sequences so that
the randomness requirement is met
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Publisher Copyright
Funding Info:
The research is supported by National Research Foundation,
Singapore, jointly with Energy Market Authority and Keppel
Offshore & Marine Limited under the Energy Programme
“EMA-KOM Joint RFP (EMA-EP007-EKOM)” with Envision
Digital International Pte. Ltd. as main Host Institution