Patent ID: 7218604
Filing Date: 2007-05-15
Classification: H04L

Abstract:
1. A wireless transmitter, comprising: circuitry for providing a plurality of control bits; circuitry for providing a plurality of user bits; circuitry for modulating the plurality of control bits and the plurality of user bits into a stream of complex symbols; circuitry for converting the stream of complex symbols into a parallel plurality of complex symbol streams; circuitry for performing an inverse fast Fourier transform on the parallel plurality of complex symbol streams to form a parallel plurality of OFDM symbols; circuitry for converting the parallel plurality of OFDM symbols into a serial stream of an integer N+1 OFDM symbols, wherein N+1 is a multiple of three; wherein each OFDM symbol in the serial stream of OFDM symbols comprises a plurality of data points; wherein selected OFDM symbols in the serial stream of OFDM symbols carry modulation information and the selected OFDM symbols are each a third OFDM symbol in a sequence of three OFDM symbols in the serial stream and wherein each second OFDM symbol in the sequence of three OFDM symbols in the serial stream comprises control data points carrying a portion of a synchronization code; wherein the modulation information in one or more of the selected OFDM symbols comprises a plurality of modulation groups; wherein each of the plurality of modulation groups comprises a number of modulation parameters that describe modulation of a corresponding set of data points in a subsequent OFDM symbol in the serial stream of OFDM symbols.