Method for wireless differential communication using multiple transmitter antennas
AssigneeLucent Technologies Inc.
InventorsBertrand Hochwald, Wim Sweldens
Life of this patent
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Abstract
The method of differential communication for multiple transmitter antennas generalizes conventional coding of information in the phase shift between successive complex scalars signals used in single antenna communication to signals that are complex matrices. Each column of such a matrix represents a time sequence of signals emitted by a respective antenna of a multiple transmitter array. Preferably, the signal matrices are unitary matrices that form at least part of a finite group under multiplication. Data is encoded by making each transmitted signal the product of the previous signal and a selected one of the signal matrices.
Claims27
A method of wireless differential communication for a multiple transmitter antenna array, comprising:
- generating a plurality of baseband signals, each baseband signal including one or more sequences, in time, of complex numbers, each sequence to be transmitted from a respective antenna of said multiple transmitter antenna array, each baseband signal being representable as a transmission matrix in which each column corresponds to one of said sequences and represents a respective antenna and in which each row represents a respective time segment, each transmission matrix generated based on a previous transmission matrix representing a previously transmitted baseband signal and at least one provided data sequence of a predetermined lengh;
- modulating said baseband signals on a carrier to form carrier-level signals;
- and
- transmitting said carrier-level signals from said multiple transmitter antenna array.
A method of wireless differential communication, comprising:
- receiving receive carrier-level signals, each of which is formed from transmit carrier-level signals transmitted from a multiple transmitter antenna array passing through a channel, using at least one receiver antenna, said transmit carrier level signals formed from a plurality of transmit baseband signals;
- demodulating said receive carrier-level signal sequence to form a plurality of receive baseband signals, each receive baseband signal including one or more receive sequences, in time, of complex numbers, each receive baseband signal being representable as a reception matrix in which each column corresponds to one of said receive sequences and represents a respective receiver antenna and in which each row represents a respective time segment, each reception matrix depending on data encoded therein and a previous reception matrix representing a previously received receive baseband signal;
- and
- processing said receive baseband signals to obtain data represented thereby.
A method of wireless differential communication, comprising:
- receiving receive carrier-level signals, each of which is formed from transmit carrier-level signals transmitted from a multiple transmitter antenna array passing through a channel, using at least one receiver antenna, said transmit carrier-level signals were formed from a plurality of transmit baseband signals, each transmit baseband signal including one or more transmit sequences, in time, of complex numbers, each transmit sequence having been transmitted from a respective antenna of said multiple transmitter antenna array, each transmit baseband signal being representable as a transmission matrix in which each column represents a respective transmitter antenna and each row represents a respective time segment, each transmission matrix generated based on a transmission matrix representing a previously transmitted transmit baseband signal and input data;
- demodulating said receive carrier-level signals to form a plurality of receive baseband signals;
- and
- processing said receive baseband signals to obtain data represented thereby.
Dependencies are inferred from the claim text.