Method and apparatus for wideband transmission of digital signals between a telephone central office and customer premises

摘要

In a telephone local loop transmission arrangement, data is communicated from the customer premises to the central office utilizing a multi-dimensional, passband signal illustratively at 480 kb/s and 1.544 Mb/s. In accordance with a feature of the invention, the passband signal is a so-called carrierless amplitude modulation/phase modulation signal. A trellis code or other code that provides coding gain can be used in conjunction with maximum likelihood sequence estimation, also referred to as Viterbi decoding, at the receiver to provide enhanced receiver noise immunity.