Channel-adaptive waveform modulation
AssigneeAlcatel-Lucent USA Inc.
InventorsAiyou Chen, Thomas Marzetta, Jack Salz
Life of this patent
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Abstract
A method for transmitting a sequence of data blocks of equal length includes obtaining part of a matrix for the impulse response function of a communication channel between a transmitter and a receiver. The part relating to channel-induced interference between sampling intervals of adjacent ones of the data blocks. The method includes designing a set of one or more linearly independent waveforms based on the obtained part of the matrix for the impulse response function and transmitting a sequence of the data blocks over the channel from the transmitter to the receiver. Each data block of the sequence is a weighted linear superposition of the one or more waveforms of the designed set.
Claims16
A method for transmitting a sequence of data blocks of equal length, comprising:
- obtaining part of a matrix for the impulse response function of a communication channel between a transmitter and a receiver, the part relating to channel-induced interference between sampling intervals of adjacent ones of the data blocks;
- designing a set of one or more linearly independent waveforms based on the obtained part of the matrix for the impulse response function;
- and
- transmitting a sequence of the data blocks over the channel from the transmitter to the receiver, each data block of the sequence being a weighted linear superposition of the one or more waveforms of the designed set.
A method for receiving at a receiver data transmitted from a transmitter via a communication channel having a delay-spread, comprising:
- receiving a sequence of transmitted data blocks at the receiver from the communication channel at a receiver, each transmitted data block having the same temporal length and being transmitted to the channel from the transmitter;
- for each of the received data blocks, evaluating an inner product between the received data block and one or more linearly independent conjugate waveforms by sampling a product of the conjugate waveform times the received data block at a series of sampling intervals of equal sampling length;
- and
- wherein the evaluating is performed over a number of the conjugate waveforms that is greater than the number of the sampling intervals minus the delay-spread, the delay-spread being expressed as a number of the sampling intervals.
An apparatus for communicating data, comprising:
- a transmitter comprising:
- an array of modulators, each modulator being configured to modulate an amplitude of a corresponding waveform over a sequence of sampling intervals in response to receipt of each of a sequence of input data symbols;
- and
- an adder being configured to form a sequence of data blocks, each data block being a linear superposition of the modulated transmitter waveforms produced by the modulators responsive to receipt of one of the input data symbols, the adder being configured to transmit the data blocks to a receiver via a communication channel;
- and
- wherein the transmitter is configured to dynamically adapt the waveforms in a manner responsive to a part of the impulse response function of the communication channel relating to channel-induced interference between sampling intervals of adjacent data blocks.
Dependencies are inferred from the claim text.