Modem data constellation design including power compensation for analog loss and utilization of maximum dynamic range of CODEC

Abstract

A method, system, and computer program product is disclosed for determining the optimal power of the downstream data signal transmitted by a digital server and designing a constellation based on this determination. Digital and analog loss is compensated for by calculating the constellation power, taking into consideration the client modem ADC'S dynamic range, the total loss across the network (both digital and analog losses), and the constrained maximum power of the digital network, so that the power of the transmitted signal at the input of the decoder's (client modem's) ADC is less than but as close as possible, and preferably equal to, the ADC'S maximum average power, PADC. The total loss LT across the entire network is determined from the handshake information exchanged during the modem start-up sequence. Using this information and the known dynamic range of the client modem's ADC, the power of the downstream data signal can be optimized.

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