么正空時調變可用於傳送端與接收端不知道衰退係數的平坦衰退通道中，本論文提出一種新的么正空時調變，不同於過去所提出的架構，我們考慮不具有代數結構的么正空時碼字，使用漸進聯集上界與分集乘積去電腦搜尋么正空時碼字。 Unitary space-time modulation(USTM) is well tailored for flat fading channels where neither the transmitter nor the receiver knows the fading coefficients. In this thesis, we propose a new schemes of unitary space-time modulation. Different from the past proposed systematic codeword, we consider the unitary space-time codeword which don’t have the algebraic structure. Then we use asymptotic union bound and diversity product to search unitary space-time codeword.
