We describe a secure communication scheme that uses the random fluctuation of the natural
environment of communication channels. Only the transmitter and the receiver share the …

We consider secret key agreement based on radio propagation characteristics in a two-way
relaying system where two legitimate parties named Alice and Bob communicate with each …

The recent increase in the number of portable and mobile communications terminals in
Japan has been quite remarkable. In fact, since 1996, the growth in wireless terminals can be …

The hardware implementation of an adaptive array as a technique for compensating multipath
fading in mobile communications is described. The number of the antenna elements is four…

The performance of an adaptive-modulation/time division duplex (TDD) scheme to support
constant-bit-rate services under transmission delay time constraint conditions is evaluated in …

A secure communication scheme that uses the random fluctuation of the natural environment
of communication channels is studied and an improved scheme for the secret key …

In this paper, we proposed an adaptive key generation based on the channel characteristics
in OFDM mobile radio. We have shown that DCT-based preprocessing can remove the …

As a countermeasure for eavesdroppers in wireless communication, a secret key agreement
scheme using a variable directional antenna named ESPAR antenna was developed. In …

A high capacity time division multiple access (TDMA) cellular system that employs a pilot-symbol
aided 16 quadrature amplitude modulation (QAM), block coding, and cyclical slow …

As a measure for preventing eavesdropping on land‐mobile communication, this paper
studies an application of a private key agreement based on the propagation characteristics of …