Patent ID: 6347120
Filing Date: 2002-02-12
Classification: H04L

Abstract:
A communication method for transmitting high priority data and low priority data at a same time using a plurality of sub-carriers, comprising the steps of:transmitting on a transmitting side a transmission signal wherein high priority symbols composed of high priority information bits of said high priority data and low priority symbols composed of low priority information bits of said low priority data are positioned alternately, and each symbol of a differential symbol stream obtained by differential-modulating said high priority symbols based on a differential phase between a high priority symbol and one previous low priority symbol is assigned to a sub-carrier for alternately positioning high priority sub-carriers whereon said high priority data is superimposed and low priority sub-carriers whereon said low priority data is superimposed;performing at a receiving side when said transmission signal is received at a reception timing having time lag due to transfer delay a predetermined reception processing on a received reception signal for obtaining a reception symbol stream whereon said high priority symbols and said low priority symbols positioned alternately on a time axis are aligned: detecting at said receiving side a phase offset component from said high priority symbols of said reception symbol stream wherein a differential phase is removed, said differential phase being obtained by differential-demodulating said reception symbol stream; decoding at said receiving side said high priority data based on a signal component of said high priority symbols; and decoding at said receiving side said low priority data after said phase offset component is removed from said low priority symbols of said reception symbol stream.