Patent ID: 6449246
Filing Date: 2002-09-10
Classification: H04L

Abstract:
A method for communicating a sequence of input bits over a wireless channel from a transmitter to a receiver to produce a sequence of output bits from the receiver corresponding to the sequence of input bits, the method comprising the steps ofconverting in the transmitter the sequence of input bits into a corresponding set of input symbols wherein each of the input symbols represents a unique plurality of the input bits, modulating in the transmitter each of the input symbols to produce a corresponding set of complex symbols, computing in the transmitter the inverse Discrete Fourier Transform of the set of complex symbols to produce a transformed set of symbols, augmenting in the transmitter the transformed set of symbols with cyclic prefix symbols determined with reference to the transformed set to produce a set of output symbols, processing in the transmitter the set of output symbols to generate a radio frequency signal at a given carrier frequency, the radio frequency signal including carrier synchronization information and complex symbol timing information to recover the output symbols, propagating the radio frequency signal over the wireless channel from the transmitter, recovering in the receiver the carrier frequency synchronization information and recovering the complex symbol timing information from the radio frequency signal, processing in the receiver the radio frequency signal using the recovered carrier frequency synchronization and the recovered timing information to produce a stream of recovered complex symbols, removing in the receiver the cyclic prefix symbols from the recovered complex symbols to produce a reduced set of complex symbols, computing in the receiver the Discrete Fourier transform of the reduced set of complex symbols to produce a set of detected complex symbols, and demodulating in the receiver the detected complex symbols to generate the sequence of output bits.