Patent ID: 8189453
Filing Date: 2012-05-29
Classification: H04L

Abstract:
1. A method, comprising: providing at least a first and a second block of information; mapping at least said first and second information blocks to respective blocks of modulation symbols; subjecting said blocks of modulation symbols to inverse discrete Fourier transform (IDFT) processing, thereby to provide at least first and second respective OFDM symbols which share at least some frequency subchannels in at least some transmission timeslots; appending a respective cyclic prefix to each of at least the first and second OFDM symbols; after said appending step, combining said OFDM symbols, thereby to provide a composite signal for transmission in which the respective OFDM symbols are not mutually orthogonal; and transmitting the composite signal; wherein the cyclic prefix appended to the first OFDM symbol has a different length from the cyclic prefix appended to the second OFDM symbol.