stbc 中文意思是什麼
stbc
解釋
區塊碼-
Adaptive beamforming for the multiuser stbc system
系統中一種自適應波束形成方法 -
Stbc ( space time block code ) is the main method to realize mimo diversity, and it is good at mitigating the influence of wireless multipath fading
而stbc （ spacetimeblockcode ，空時分組碼）則是實現mimo分集的重要手段，長于對抗通道的多徑衰落。 -
Space - time codes can be divided into tree mainly parts : bell layered space - time architecture ( blast ), space - time trellis codes ( sttc ) and space - time block codes ( stbc ). in this paper, we mainly compare the performance of blast and stbc in many aspects, such as design criterion, transmission rate, diversity gain, diversity combining, bit error rate and channel capacity etc. in this paper, we first respectively analysed the instantaneous received symbol energy - to - noise ratio of v _ blast in the diversity combining methods of maximal ratio combining ( mrc ), equal gain combing ( egc ) and selective combing ( sc )
Mimo技術核心是空時編碼（ stc ） 。空時編碼主要分為三種:分層空時碼（ blast ） 、空時格碼（ sttc ）和空時塊碼（ stbc ） 。本文主要對分層空時碼和空時塊碼這兩種編碼方式在設計準則、傳輸速率、分集增益、接收合併、比特差錯率和通道容量等方面進行了較為詳盡的研究。 -
Under rayleigh fading channel, we also simulated and compared ber in siso 、 simo and mimo systems. secondly, based on careful study the ber and the channel capacity under white noise channel under mpsk modulation when the channel is rayleigh fading, we duduced the expressions of stbc ’ s ber and channel capacity under rice and nakagami fading. and also analysed the performances through numerical simulation using matlab to testify the exactitude of the dudeced expressions. finally, there exists an error floor of stbc through studying on its performance on time - selectiv fading channel. we analysed the reason and proposed two new decode combination scheme to eliminated the error floor and the performance of stbc on time - selective fading channel is improved. and also compared the two scheme ’ s complication and snr gain
這些結果大部分是閉式結果，能比較準確地衡量空時塊碼的性能，並對不同衰落的性能做了相互比較，其結果對空時塊碼的實際應用具有一定的指導意義。實際的通道是時變的，分析了空時塊碼在時間選擇性衰落通道中產生誤差地板效應的主要原因是存在碼間干擾（ isi ） ，在此基礎上提出了兩種能消除誤差地板效應的譯碼合併方案，並對這兩種方案的復雜度和信噪比增益進行了比較。 -
In improving the performance of stbc, turbo code is concatenated to stbc. the structure and decoding algorithm of concatenation of turbo - tcm and stbc are studied
為進一步提高空時分組編碼性能，選用turbo碼對空時分組編碼進行擴展，分析了turbo - tcm和空時分組編碼的編碼形式和譯碼演算法。 -
Simulation result shows that the scheme is valid to suppress directional strong interference for stbc mimo system although with some performance loss compared with the ideal case of non - interference
模擬結果表明該方案雖然相對于理想無干擾的系統來說有一定的性能損失，但是能有效抑制空時分組碼mimo系統中的強定向干擾。 -
Then the performance for sttc in multipath and time - dispersive fading channels is derived. in chapter 5, space - time block coding ( stbc ) is studied
研究了空時格狀編碼在多路徑和時間色散的衰落通道中的性能，得到它的性能限。 -
However, stbc overcomes the limitation of sttc that its decoding is very complexly. it makes use of ml decoding arithmetic which possesses orthogonal designs
空時分組碼則克服了空時格形碼譯碼過于復雜的缺陷，它利用具有正交設計的最大似然譯碼演算法實現。 -
Finally, a total design scheme that realizes the stbc is shown and the software which supports the platform is also given
之後，給出了空時分組碼編譯碼器的硬體總體設計方案，闡述了軟體的具體實現過程。 -
Therefore, the research targets of this dissertation are to realize the coding and the decoding of stbc after studying its theory
本文在研究了空時分組碼的理論基礎上，對其編譯碼器進行了硬體模擬實現。 -
Although the structure of stbc decoding is very simple, it can achieve the same diversity gain as the method of mrc, and its use of the spectrum is very high. because of these advantages, sttb is referred into the 3gpp1
由於空時分組碼編譯碼器的結構相當簡單，卻能獲得與最大比合併相同的分集增益，並且它的頻譜利用率高，已經被引用到3gpp1中。 -
In term of the orthogonal property of alamouti scheme and the character of the ofdm system equivalent model expression of receiver signal for stbc - ofdm system was obtained by flexible transform method so that the inverse of matrix was avoided using direct - decision mode and the complexity of computation and receiver was decreased. the simulation results show the validity and efficiency of the proposed receiver. ( 6 ) an adaptive equalization algorithm used in space - time block coded ofdm ( stbc - ofdm ) system with alamou
該演算法充分利用了alamouti編碼的正交特性和多發射天線ofdm系統特點，通過靈活的變換對接收信號進行等價的表示；通過對11矩陣求逆的研究，將塊最小二乘遞推演算法（ brl ）中的zkxzk的矩陣求逆分解為k個2x2矩陣的求逆，從而降低了自適應演算法的運算量和接收機的復雜度。 -
Space time coding was proposed by combining transmit diversity and coding technology to improve the system performance, such as error bit rate, data rate, and system capacity. in particular, space - time block coding ( stbc ) schemes, proposed originally by alamouti were adopted by the 3g standardization committees as one key technique in 3g wireless systems
將發送分集與編碼調制技術相結合，進一步產生了空時編碼技術，由於空時編碼技術具有優異的抗衰落性能，並且能通過發送分集和接收分集提供高速率、高質量的數據傳輸，因此它已經成為第三代移動通信技術的重要組成部分，並將繼續在下一代移動通信技術的發展中發揮重要作用。 -
Because of the affection of noise and signal fading, in order to high data rate access and high quality, wireless communication need new technology to improve the link reliability and enhance the spectrum efficiency. mimo ( multiple input and multiple output ) can enhance the spectrum efficiency and increase channel capacity greatly, and reduce the multipath affection without spectrum band and power increasing. the 3th generation mobile communication wcdma is coming, with the purpose of putting mimo, stbc ( space time block coding ), space diversity into practice of wcdma systems, in order to lay the foundation of 3g toward 4g, this dissertation has done some research under this background
在發射機和接收機使用多個天線進行數據傳輸的多輸入多輸出（ mimo ）技術，可以在不增加帶寬和天線發送功率的條件下，成倍的提高頻譜利用率，提高系統的通道容量，還可以抗多徑干擾。第三代移動通信wcdma即將到來，為了將多天線技術（ mimo ） ，空間分集技術，空時編碼技術用到wcdma系統中去，為第三代移動通信向第四代移動通信系統平穩過渡奠定一定的基礎，需要做一些理論上的研究。 -
Space - time block codes ( stbc ) based on orthogonal design has attracts enough attentions in its applications in mimo - ofdm systems for its full diversity exploiting and low coding / decoding complexity. these applications include not only system performance improvement, but also reduction of the peak to average power ratio in mimo - ofdm systems. under these backgrounds, this paper first studies space - time block codes under the single carrier, flat fading situation, discusses the encoding / decoding principle and its performance under different channels. then, the author focused on the performance of space - time codes under time selective and frequency selective channels, uncovered the fundamental cause of how maximum doppler shift and power delay profile influences the performance of space - time codes through deduction and simulation
在上述背景下，本文以單載波，平坦衰落通道下的空時分組碼為切入點，深入分析了其編譯碼原理和在不同通道情況下的性能;以此為基礎，後文展開了對空時分組碼在多載波，時間選擇性和頻率選擇性衰落通道下的性能研究，通過理論推導和充分的模擬，揭示了空時/頻分組碼在時頻選擇性衰落通道中的性能變化的根本原因;在以上對多載波系統中空時分組碼的研究的過程中，作者發現了空時分組碼在降低系統峰平比方面應用的可行性，提出了一種降低峰平比的新方法。 -
This dissertation introduced the development of mobile communication firstly, then given out the key technology of next generation communication, discussed the promising diversity technology. mimo and stbc is given out in the next chapter, simulation results proved the benefitial of mimo and stbc. some channel estimation methods are introduced subsequently, the channel estimation method based on orthogonal design is proved better than ls ( least square ) algorithm
本文就是以這一背景而展開的。本文以移動通信發展的歷程為開端，介紹了下一代移動通信中的關鍵技術，重點介紹了將會得到廣泛應用的分集技術，接著給出了下一代移動通信系統中將廣泛應用的mimo技術和空時編碼技術，模擬結果證明了該技術將會帶來顯著的性能增益。 -
In this paper, the rationale for stbc and beamforming techniques is firstly described, mainly focusing on the orthogonal stbc and transmit beamforming, which are the foundation of the following combination scheme
首先對空時分組碼和波束形成技術的基本原理進行了系統分析，重點介紹了正交空時分組碼和發射波束形成，為后續研究兩者的聯合方案提供了充分的理論依據。 -
Yung - fa huang, jen - yung lin, and tan - hsu tan, “ performance of partial interference canceller with stbc for mc - cdma systems, ” in proc. of iwcmc 2006, pp. 491 - 496, july 3 - 6, 2006, vancouver, canada
林寬智，譚旦旭， "多輸入多輸出多頻帶正交分頻多工超寬頻通訊系統之效能分析" 2005年民生電子研討會論文集。 -
Computer simulation results indicate that the hybrid stbc / v - blast mimo - ofdm system can combat multi - path fading and fast fading at the same time
模擬結果和理論分析表明，後者能夠同時有效對抗多徑和快衰落移動通道環境。 -
Also, the low complexity decoding algorithm for space - time block code ( stbc ) is emphasized and studied as well, which can make it convenient for practical applications
此外，為了便於空時分組碼的應用和實現，本文著重研究了空時分組碼的低復雜度譯碼演算法。
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