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In this paper, the authors investigate how to send space time codes with full diversity and low decoding complexity for Z channels with any number of users using precoders. First, they assume, that they have J transmitters and J receivers. Each transmitter sends code words to respective receiver at the same time. They propose an orthogonal transmission scheme that combines space-time codes and array processing to achieve low-complexity decoding and full diversity for transmitted signals. To their best knowledge, this is the first general scheme which can achieve low-complexity decoding and full diversity for any transmitted code word in Z channel with any number of uses when all the users transmit at the same time.
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