Equalization and interference rejection for the terrestrial broadcast of digital HDTV

The authors address the problem of transmitting digital HDTV signals in a co-channel interference (CCI) limited environment. A new signal processing technique aimed at rejecting CCI from adjacent analog transmitters is described. The focus is on a receiver structure employing a form of joint decision-feedback equalization (DFE)/trellis coded modulation to combat the interference. DFE is normally not used in coded systems because delay-free decisions are required from the decoder. It is shown that DFE can be used in the application be exploiting the cyclostationary properties of the interference. The technique has several advantages over methods previously proposed: (1) processing is constrained to the receiver; (2) the scheme is able to make use of powerful coding schemes; (3) the scheme is adaptive; and (4) reception of conventional NTSC (National Television Systems Committee) receivers is not affected by this scheme. Simulation results illustrating the performance of this receiver are given.<>