On the use of cyclostationary filters to transmit information
Linear periodic time-varying filters are often introduced today in telecommunications. They spread the spectrum and can be used for scrambling, multi-user access or channel modeling. Recently, the authors have defined linear cyclostationary filters. In particular, this generalization has permitted us to take into account the random parameters of a transmission channel. This paper defines a new case of linear cyclostationary filter where information is included in the filter. We first recall the definition of linear periodic and linear cyclostationary filters. The paper presents then particular cases of these filters based on clock change. Thus, we introduce modulated periodic clock change. This filter can be used to transmit simultaneously an analog and a digital signal. We present the reconstruction method for the initial signals. We obtain reconstruction results in the case of the simultaneous transmission of analog and binary information.