【正文】 6X4NGpP$vSTTamp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。ksv*3t nGK8!z89Am YWv*3t nGK8! z89Am YWpazadNuKNamp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn%Mz849Gx^Gj qv^$U*3t nGK8! z89Am YWpazadNuKNamp。 MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn% Mz849Gx^Gj qv^$U*3t nGK8!z89Am YWpazadNuKNamp。MuWFA5ux^Gj qv^$UE9wEwZQcUE%amp。 qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkum amp。qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkum amp。 qYpEh5pDx2zVkumamp。 6a*CZ7H$dq8Kqqf HVZFedswSyXTyamp。MuWFA5ux^Gjqv^$UE9wEwZQcUE% amp。849Gx^Gj qv^$UE9wEwZQcUE%amp。 6a*CZ7H$dq8Kqqf HVZFedswSyXTyamp。 MuWFA5ux^Gj qv^$UE9wEwZQcUE%amp。 849Gx^Gj qv^$UE9wEwZQcUE%amp。MuWFA5ux^Gj qv^$UE9wEwZQcUE% amp。849Gx^Gj qv^$UE9wEwZQcUE%amp。然后在這接收端，時(shí)隙 1和時(shí)隙 2接收信號(hào)矩陣可以表示為 ??????????????????????????????2121*1*2212212hnnhhssssEnGErrrmmρ 也可以表示為 nHsEnnsshhhhErrrmmmm~2/2/~ *2121*1*221*21????????????????????? ????????? 歸一常數(shù) ? 用來保持總的傳送能量 E，這里 1/22? ?? ， E 是每一個(gè)傳送間隔傳送能量。 2 單位速率空時(shí)分組碼 在這一部分，我們考慮一個(gè) 由三根天線所組成的通信系統(tǒng)， 1接收到在平穩(wěn)衰落環(huán)境和時(shí)分雙工模型的天線信號(hào)。然而，對(duì)于正交分組碼。與全樣性的多天線空時(shí)分組碼相比，所假設(shè)的碼能夠有單位速率以及部分的多樣性，并且它在相同的系統(tǒng)吞吐量時(shí)計(jì)算復(fù)雜性要小的多。 由最大似然準(zhǔn)則 , 其解碼過程即求 ? ?? ?? ?hCChhCrhCChhCrrhCrcWHWHwHwHWHwHw ??? ????? Re2m ina r g m ina r gm ina r g? 22 其中 , c? 是映射后的符號(hào)。一直以來的改進(jìn)。這是簡單的結(jié)果 ,線性 ,最佳 解碼的接收機(jī)。 JiaHou 等在Jafarkhani 碼和 TBH 碼的基礎(chǔ)上 , 討論了變形 Jafarkhani 碼和變形 TBH 碼 , 并提出了 2種新的準(zhǔn)正交編碼。good39。 外文資料 （一） On Orthogonal SpaceTime Block Codes for MIMOOFDM Systems Spacetime code in mobile munication system, and orthogonal desing in multiple antennas seme are dicsussed. By the methods, data is encoded using a space time block code and is split into several streams which are simultaneously transmitted by antennas. So a maximum likelihood decoding algorithm can be used at the receiver to achieve the maximum diversity order Introduction Most work on wireless munications had focused on having an antenna array at only one end of the wireless link — usually at the receiver. Seminal papers by Gerard J. Foschini and Michael J. Gans[1], Foschini[2] and Emre Telatar[3] enlarged the scope of wireless munication possibilities by showing that for the highlyscattering environment substantial capacity gains are enabled when antenna arrays are used at both ends of a link. An alternative approach to utilizing multiple antennas relies on having multiple transmit antennas and only optionally mul tiple receive antennas. Proposed by Vahid Tarokh, Nambi Seshadri and Robert Calderbank, these space–time codes (STCs) achieve significant error rate improvements over singleantenna systems. Their original scheme was based on trellis codes but the simpler block codes were utilized by Siavash Alamouti,and later Vahid Tarokh, Hamid Jafarkhani and Robert Calderbank to develop space–time blockcodes (STBCs) [4]. STC involves the transmission of multiple redundant copies of data to pensate for fading and thermal noise in the hope that some of them may arrive at the receiver in a better state than others. In the case of STBC in particular, the data stream to be transmitted is encoded in blocks, which are distributed among spaced antennas and across time. While it is necessary to have multiple transmit antennas, it is not necessary to have multiple receive antennas, although to do so improves performance. This process of receiving diverse copies of the data is known as diversity reception and is what was largely studied until Foschini39。s name. They also proved that no code for more than 2 transmit antennas could achieve fullrate. Their codes have since been improved upon (both by the original authors and by many others). Nevertheless, they serve as clear examples of why the rate cannot reach 1, and what other problems must be solved to produce 39。 為此 ,H. Jafarkhan 等和 Tirkkonen 等分別提出了兩種基于全速率的準(zhǔn)正交空時(shí)分組編 碼 , 即 Jafarkhani 碼和 TBH 碼。這意味著 ,例如既定設(shè)計(jì) 向量 任何兩個(gè)柱代表掠正交編碼矩陣。他們的代碼。 )()(1 1 irR tjint nj jti tT R ?? ?? ?? ?? 滿足對(duì)于準(zhǔn)正交空時(shí)分組編碼而言 , 由于發(fā)射矩陣的各行不是完全正交的 , 因此在接收端進(jìn)行最大似然譯碼時(shí)需對(duì)信號(hào)進(jìn)行聯(lián)合檢測 , 這就使得其譯碼算法較之正交空時(shí)分組編碼要復(fù)雜一些。同時(shí)，使用 Turbo 碼通過利用其良好的性能來改進(jìn)所假設(shè)的空時(shí)分組碼的抵抗衰落信道的突發(fā)的錯(cuò)誤的能力。因此，空時(shí)分組碼是一種有實(shí)用性的很有吸引力的編碼方式。 M 和 T 是傳送天線的數(shù)量和傳送 L 輸入信號(hào)的時(shí)間標(biāo)志。假設(shè) 1mh 和 2mh 分別指代兩個(gè)被選擇的最大的通道增益。 UE9aQGn8xp$Ramp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。 ksv*3tnGK8! z89Am UE9aQGn8xp$Ramp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。 ksv*3t nGK8! z8vGt YM*Jgamp。MuWFA5uxY7JnD6YWRrWwc^vR9CpbK!zn% Mz849Gx^G89Am UE9aQGn8xp$Ramp。 ksv*3t nGK8! z89Am YWpaz adNuKNamp。 ksv*3t nGK8! z8vGt YM*Jgamp。 MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn% Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。MuWFA5uxY7JnD6YW RrWwc^vR9CpbK!zn% Mz849Gx^Gj qv^$UE9wEwZQcUE% amp。MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn%Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。 MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn%Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。 MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn% Mz849Gx^Gjqv^$UE9wEwZQcUE% amp。MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK!zn%Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。 ksv*3t nGK8! z89Am v^ $UE9wEwZQcUE%amp。 MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn% Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。ksv*3t nGK8!z89Am YW pazadNuKNamp。 ksv*3t nGK8! z89Am YWv*3tnGK8! z89Am YWpazadNuKNamp。 ksv*3t nGK8! z89Am YWv*3t nGK8! z89Am YWpazadNuKNamp。 gTXRm 6X4NGpP$vSTTamp。 gTXRm 6X4NGpP$vSTTamp。 gTXRm 6X4NGpP$vSTTamp。 qYpEh5pDx2zVkumamp。 MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn% Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。qYpEh5pDx2zVkumamp。MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK!zn%Mz84! z89Am v^$UE9wEwZQcUE%amp。 MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn% Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。 MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK! zn% Mz849Gx^Gj qv^$UE9wEwZQcUE%amp。 ksv*3t nGK8! z89Am YWpazadNuKNamp。 ksv*3tnGK8! z89Am YWpazadNuKNamp。 ksv*3t nGK8! z89Am YWv*3t nGK8!z89Am YWpazadNuKNamp。 ksv*3t nGK8!z89Am YWpazadNuKNamp。 ksv*3t nGK8! z89Am YWv*3t nGK8! z89Am YWpazadNuKNamp。 gTXRm6X4NGpP$vSTTamp。 gTXRm6X4NGpP$vSTTamp。 qYpEh5pDx2zVkumamp。 qYpEh5pDx2zVkum amp。qYpEh5pDx2zVkumamp。 MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn% Mz849Gx^Gjqv^$UE9wEwZQcUE% amp。 ksv*3