Fully-diverse sp(2) code design
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A fully-diverse code that is suitable for differential
modulation for four-transmit-antenna communication systems
is constructed based on the symplectic group Sp(2).
The code can be regarded as an extension of Alamouti’s celebrated two-transmit-antenna orthogonal design
which can be constructed from the group Sp(1). The structure
of the code lends itself to efficient ML decoding via the sphere decoding algorithm.
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