Patent ID: 7756222
Filing Date: 2010-07-13
Classification: H04L

Abstract:
1. A method of dynamic quantization in an orthogonal frequency division multiplexing (OFDM) system, the method comprising: receiving quadrature amplitude modulation (QAM) symbols for each of a number of “m” sub-carrier channels, m being an integer greater than 1; computing a channel power P computing  where the max{ } function computes the maximum value of P computing  where the min{ } function computes the minimum value of P setting a first frequency selectivity indicator (FSI) value if P determining a quantization parameter, K, which is a positive real number selected according to the first or second FSI value; applying an exponential function to the received QAM symbol, x where g(x determining a set of (2 quantizing the exponential function outputs, g(x