Pulse or digital communications – Transmitters – Plural diversity
Reexamination Certificate
2003-08-19
2009-11-10
Kim, Kevin Y (Department: 2611)
Pulse or digital communications
Transmitters
Plural diversity
Reexamination Certificate
active
07616703
ABSTRACT:
To provide transmission and reception diversity schemes for a powerful, flexible and less complex bandwidth-efficient space-time modulation scheme there is proposed a method of and apparatus for differential multiple-norm space-time transmit diversity from a unitary space-time modulation scheme using at least two transmit antennas. In a first step a group of transmission bits is divided into a first sub-group of transmission bits and a second sub-group of transmission bits. In a second step the first sub-group of transmission bits is mapped onto a constellation matrix of a differential unitary space-time modulation scheme. In a third step a scaling factor is determined from the second sub-group of transmission bits. In a fourth step a transmission matrix is sep up through differential encoding of the constellation matrix and a previously determined transmission matrix in combination with scaling by the scaling factor. The differential multiple-norm transmit diversity according to the present invention improves distance properties of the modulation scheme which are relevant for achievable error rates and extends higher order modulation also to the area of differential transmit diversity schemes from unitary designs.
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Kim Kevin Y
NTT DoCoMo Inc.
Nutter & McClennen & Fish LLP
Penny, Jr. John J.
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