Open-loop diversity technique for systems employing...

Details Open-loop diversity technique for systems employing... Open-loop diversity technique for systems employing...

2011-04-19

2011-04-19

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S267000, C375S316000

Reexamination Certificate

active

07929653

ABSTRACT:
A method and apparatus for increasing the capacity of a system that use four transmit antennas and that employs conventional channel coding by performing space-time coding in a particular way. Each of two pairs of symbol sub-streams is space-time coded to form a respective pair of transmit-sequence chains, where at least one of the formed pairs of the transmit-sequence chains is a function of symbols of the respective symbol-sub-stream pair and not a function of the symbols of the other symbol-sub-stream pair. Four transmit sequences—two transmit sequences from each of the two pairs of symbol sub-streams—may be viewed as forming a transmission matrices B or B′ arranged as follows:Antenna105⁢-⁢1Antenna105⁢-⁢2Antenna105⁢-⁢3Antenna105⁢-⁢4⁢[b1b1-b2*-b2*b2b2b1*b1*b3-b3-b4*b4*b4-b4b3-b3*]⁢T1T2⁢T3⁢T4⁢⁢or,⁢⁢Antenna105⁢-⁢1Antenna105⁢-⁢2Antenna105⁢-⁢3Antenna105⁢-⁢4⁢[b1-b2*00b2b1*0000b3-b4*00b4b3*]⁢T1T2⁢T3⁢T4,respectively, where b1, b2, b3, and b4are the symbols derived from a respective one of four symbol sub-streams, and b1*, b2*, b3*, and b4* are, respectively, the complex conjugate of the aforementioned symbols. The rows of the matrix represent the different antennas, while the columns represent different symbol periods.

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