Patent ID: 8649364
Filing Date: 2014-02-11
Classification: H04J,H04L

Abstract:
1. A system for hybrid subcarrier mapping of data, comprising: a) a transmitter comprising a spreader and a single carrier frequency division multiple access (SC-FDMA) modulation unit, wherein input data is spread by conversion into a sequence of complex numbers in the spreader and then sent to the SC-FDMA modulation unit for modulation, and wherein the SC-FDMA modulation unit comprises modules or subroutines for N-point discrete Fourier transform (N-point DFT), subcarrier mapping, M-point inverse discrete Fourier transform (M-point IDFT), and cyclic prefix (CP) insertion; b) a receiver comprising a despreader and an SC-FDMA demodulation unit, wherein received data is demodulated in the SC-FDMA demodulation unit and despread in the despreader, and wherein the demodulation unit comprises modules or subroutines for cyclic prefix (CP) removal, M-point discrete Fourier transform (M-point DFT), subcarrier demapping and equalization, and N-point inverse discrete Fourier transform (N-point IDFT); and c) at least one channel over which data is transmitted, wherein the input data acted upon by the transmitter is transmitted from the transmitter as transmission data via the at least one channel and is the received data that is received by the receiver, wherein the system adapts the modulation format and the transmission bit rate to match current channel conditions; wherein the SC-FDMA modulates the input data by: wherein: