Adaptive air interface waveform

Details Adaptive air interface waveform Adaptive air interface waveform

2005-01-25

2005-01-25

Tse, Young T. (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S135000, C370S342000, C370S344000, C370S347000

Reexamination Certificate

active

06847678

ABSTRACT:
In one embodiment, a method for generating an adaptive air interface waveform includes generating a waveform that includes a variable carrier frequency and variable bandwidth signal. The variable bandwidth signal includes one or more subcarriers that are dynamically placeable over a range of frequencies, and each subcarrier is separately modulated according to a direct sequence (DS) spread spectrum (SS) technique. The waveform has an embedded pilot usable to optimize one or more spectrum efficiencies of the waveform. A modulation constellation, a code rate, and a code length of the generated waveform are adapted according to an available spectrum and one or more sub-carrier conditions.

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Jiliei Hou et al., “Multilevel Coding with Low-Density Parity-Check Component Codes”, 2001 IEEE Journal, pp. 1016-1020, 2001.

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