【正文】 gTXRm 6X4NGpP$vSTTamp。ksv*3t nGK8!z89Am YWpazadNuKNamp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。 MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn%Mz849Gx^Gj qv^$U*3t nGK8! z89Am YWpazadNuKNamp。 qYpEh5pDx2zVkum amp。 qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkumamp。 gTXRm 6X4NGpP$vSTTamp。ksv*3t nGK8!z89Am YWpazadNuKNamp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。 MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn% Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。 qYpEh5pDx2zVkum amp。 qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkum amp。 gTXRm 6X4NGpP$vSTTamp。gTXRm 6X4NGpP$vSTTamp。 gTXRm 6X4NGpP$vSTTamp。qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkum amp。 qYpEh5pDx2zVkumamp。 6a*CZ7H$dq8Kqqf HVZFedswSyXTyamp。 Ⅱ 單位速率正交空時(shí)分組碼 全部分集的 空時(shí)分組碼 在這部分，我們回顧在無(wú)線(xiàn)通信中對(duì)于傳送天線(xiàn)的提供最大多樣性的空時(shí)分組碼的基本原則。 the symbols are STB encoded, the resulting encoded symbols are modulated onto a pulse waveform and then transmitted from three transmit antennas respectively. In TDD model, the channel gain estimated by the uplink can be used to downlink transmission, so we can choose two maximum channel gain amplitudes from estimated three antenna channel gains, and use corresponding two transmit antennas to transmit the coded symbols, respectively. Namely, if |h1|≥|h3| and |h2|≥|h3|, we choose Txl and Tx2 to transmit symbols. Similarly, the other two cases are also easy to analysis. Here, let 1mh and 2mh denote the two chosen maximum channel gains, respectively. Then at the receiver, the received signal matrix at time slot 1 and slot 2 can be expressed by ??????????????????????????????2121*1*2212212hnnhhssssEnGErrrmmρ It can be changed as nHsEnnsshhhhErrrmmmm~2/2/~ *2121*1*221*21????????????????????? ????????? The normalized constant ρ is used to keep the total transmitted energy be E ,here ρ= 2/12? , E is the transmitted energy at each transmission interval. n is the 21 white noise matrix ， The SNR is defined as E/No. The elements of H can be obtained from the estimated channel gain coefficients in the uplink by the use of TDD mode. Considering 222221 )|||(| ??? IhhHH mmH Then, ?????? ??????????? 1*2* 21 2*2* 11212221 )|||(|2/~ mm mmmmH hnhn hnhnsshhErH Thus the decoding can be performed via linear bining and maximum likelihood decision as follows: ??????????????????????????????2121*1*2212212/ nnhhss ssEnhGErrrmmρ References [1] Siavash M Alamouti. A simple transmit diversity technique for wireless (08). [2] V R Calderbank. Spacetime block codes from orthogonal (07). [3] XueBin Liang. A highrate orthogonal spacetime block code. 2020(05). [4] T H Hanzo. Spacetime codes and concatenated channel codes for wireless munications 2002(02). [5] C Glavieux. Near optimum error correcting coding and decoding:Turbocodes1996. 譯文 單位抗衰落復(fù)正交空時(shí)分組碼級(jí)聯(lián)的 Turbo 碼 空時(shí)編碼因其正交性簡(jiǎn)單解碼和高分集 增益是一種防止衰落的有效的發(fā)射變化技術(shù)。這是特意直截了當(dāng)?shù)囊詣?chuàng)造了這個(gè)方案的創(chuàng)始人名字為名。為了將空時(shí)分組碼推廣到多個(gè)天線(xiàn) , Vahid Tarokh 等基于滿(mǎn)分集提出了正交空時(shí)分組碼。s transmissions over time. Here, sij is the modulated symbol to be transmitted in time slot i from antenna j. There are to be T time slots and nT transmit antennas as well as nR receive antennas. This block is usually considered to be of 39。雖然是必要的 ,它有多個(gè)發(fā)射天線(xiàn) ,這是沒(méi)有必要有多個(gè)接 收天線(xiàn) ,雖然這樣做改進(jìn)效能。他們也體現(xiàn)了簡(jiǎn)單的，直線(xiàn) 解碼 是伴隨著他們的編碼方案 ,在完美的 信道狀態(tài)信息 。仿真結(jié)果表明在相同的系統(tǒng)的吞吐量以及 Turbo 碼串連情況下，所假設(shè)的碼相對(duì)于那些全樣性的碼有更加低的誤碼率。 圖 1 圖 2 數(shù)據(jù)來(lái)源位首先是由 Turbo 碼的輸入，然后被映射入對(duì)應(yīng)的標(biāo)志。 gTXRm 6X4NGpP$vSTTamp。 gTXRm 6X4NGpP$vSTTamp。 UE9aQGn8xp$Ramp。 gTXRm 6X4NGpP$vSTTamp。ksv*3t nGK8!z89Am YWpazadNuKNamp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。 ksv*3t nGK8!z89Am YWpazadNuKNamp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。 gTXRm 6X4NGpP$vSTTamp。qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkumamp。 MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn% Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK!zn%Mz849Gx^Gj qv^$UE9wEwZQcUE% amp。 k sv*3t nGK8! z89Am YWv*3t nGK8!z89Am YWpazadNuKNamp。 gTXRm 6X4NGpP$vSTTamp。 qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkumamp。qYpEh5pDx2zVkumamp。MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn%M z849Gx^Gj qv^$UE9wEwZQcUE%amp。 ksv*3t nGK8! z89Am YWv*3tnGK8! z89Am YWpazadNuKNamp。 gTXRm 6X4NGpP$vSTTamp。gTXRm 6X4NGpP$vSTTamp。 ksv*3t nGK8! z89Am YWv*3t nGK8! z89Am YWpazadNuKNamp。 MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn% Mz849Gx^Gjqv^$UE9wEwZQcUE% amp。 MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn% Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。 MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn% Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。 qYpEh5pDx2zVkumamp。 gTXRm 6X4NGpP$vSTTamp。 gTXRm 6X4NGpP$vSTTamp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。MuWFA5uxY7JnD6YWRrWwc^vR9CpbK!zn% Mz849Gx^Gj qv^$UE9wEwZQcUE% amp。MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn%Mz84! z89Am v^$UE9wEwZQcUE%amp。MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK!zn%Mz849Gx^Gj qv^$UE9wEwZQcUE% amp。 qYpEh5pDx2zVkum amp。 qYpEh5pDx2zVkum amp。 qYpEh5pDx2zVkumamp。 MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn% Mz849Gx^Gjqv^$UE9wEwZQcUE% amp。 MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK!zn%Mz849Gx^Gj qv^$UE9wEwZQcUE% amp。MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn%Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。 參考文獻(xiàn) [1] Siavash M Alamouti. A simple transmit diversity technique for wireless (08). [2] V R Calderbank. Spacetime block codes from orthogonal (07). [3] XueBin Liang. A highrate orthogonal spacetime block code. 2020(05). [4] T H Hanzo. Spacetime codes and concatenated channel codes for wireless munications 2002(02). [5] C Glavieux. Near optimum error correcting coding and decoding:Turbocodes1996. 內(nèi)部資料 請(qǐng)勿外傳 9JWKf wvGt YM*Jgamp。另外，由于接收大小和能力的限制，空時(shí)分組碼的低復(fù)雜解碼算法也是必需的。 input symbols lssss ,..., 321 ,and their conjugates **3*2*1 ,..., lssss ,and it satisfies the following plex orthogonal condition MMLL LH ISGG ???? )||(21 where superscript H denotes the Hermitian conjugation and I is the MM identity matrix. M and T are the numbers of transmitt