SYSTEMS AND METHOD FOR ORTHOGONAL FREQUENCY DIVISIONAL MULTIPLEXING
First Claim
1. A method for a remote unit of an Orthogonal Frequency Division Multiplexing (OFDM) multi-point to point system to communicate with a host unit, the method comprising:
- transmitting non-control data on up to a plurality of tones from a remote unit using a signal configured to combine with a signal from at least one other remote unit on a different to form a coherent OFDM waveform having Nyquist spacing between tones, the non-control data modulated with a first modulation scheme, the first modulation scheme selected from a plurality of modulation schemes;
transmitting control data on up to a plurality of other tones from a remote unit using a signal configured to combine with a signal from at least one other remote unit on a different to form a coherent OFDM waveform having Nyquist spacing between tones, the control data modulated with a modulation scheme which has fewer constellation points per symbol than each of the plurality of modulation schemes.
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Abstract
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a method for communication comprises receiving baseband user data; modulating the baseband user data onto a first plurality of parallel streams based on a first modulation constellation; modulating non-user data onto a second plurality of parallel streams based on a second modulation constellation, wherein the first modulation constellation provides a higher bit-rate than the second modulation constellation; applying an inverse Fourier transform algorithm to the first plurality of parallel streams and the second plurality of parallel streams to produce a set of complex time-domain samples; and transmitting a radio frequency transmission signal based on the set of complex time-domain samples.
125 Citations
6 Claims
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1. A method for a remote unit of an Orthogonal Frequency Division Multiplexing (OFDM) multi-point to point system to communicate with a host unit, the method comprising:
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transmitting non-control data on up to a plurality of tones from a remote unit using a signal configured to combine with a signal from at least one other remote unit on a different to form a coherent OFDM waveform having Nyquist spacing between tones, the non-control data modulated with a first modulation scheme, the first modulation scheme selected from a plurality of modulation schemes;
transmitting control data on up to a plurality of other tones from a remote unit using a signal configured to combine with a signal from at least one other remote unit on a different to form a coherent OFDM waveform having Nyquist spacing between tones, the control data modulated with a modulation scheme which has fewer constellation points per symbol than each of the plurality of modulation schemes.
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2. A method for communication, the method comprising:
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receiving baseband user data;
modulating the baseband user data onto a first plurality of parallel streams based on a first modulation constellation;
modulating non-user data onto a second plurality of parallel streams based on a second modulation constellation, wherein the first modulation constellation provides a higher bit-rate than the second modulation constellation;
applying an inverse Fourier transform algorithm to the first plurality of parallel streams and the second plurality of parallel streams to produce a set of complex time-domain samples; and
transmitting a radio frequency transmission signal based on the set of complex time-domain samples. - View Dependent Claims (3, 4, 5, 6)
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Specification