Patent ID: 7539252

Claim:
A communications system comprising: a transmitting device for transmitting a modulated signal therefrom based upon input data comprising a bit stream, the transmitting device comprising: a baseband injected pilot carrier (BPIC) generator for generating BPIC data including user information, a framer for interleaving the BPIC data within the input data bit stream to define data frames, and a modulator for modulating the interleaved BPIC data based upon a first modulation type and modulating the input data based upon a second modulation type different than the first modulation type to provide a modulated signal; and a receiving device for receiving the modulated signal from said transmitting device, the receiving device comprising: a demodulator, a frame recoverer, and a BPIC detector cooperating with said demodulator for demodulating the modulated signal from said transmitting device based upon the BPIC data and cooperating with said frame recoverer for recovering the data frames and user information also based upon the BPIC data.