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Physical layer secret key can be extracted from wireless fading channels based on channel quantization with guardband (CQG). In this paper, we analyze the key generation efficiency of the CQG protocol. Analytical closed-form expressions of bit error rate (BER) and key generation efficiency are derived for the CQG protocol. In order to further improve the key generation efficiency, we concatenate the...
A data puncturing type-II hybrid automatic retransmission request protocol, using LDPC codes which have the constructions with low encoding complexity and moderate matrix dimensions, is a good tradeoff between the system throughput and the hardware overhead. Based on the characteristics of this protocol that only the parity bits are sent in each retransmission and the puncturing is operated on the...
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