例句與造句

1. In order to support multi - rate transmission in ds - cdma , many cdma techniques such as multi - code ( mc ) scheme , orthogonal variable spreading factor ( ovsf ) and variable modulation have been used
   在ds - cdma系統(tǒng)中多速率傳輸?shù)姆椒ㄓ泻芏喾N，例如多碼方案( mc - cdma ) ，正交可變擴(kuò)頻增益方案( ovsf )和多調(diào)制方案等。
2. First of all , correlation properties of orthogonal variable - length spreading sequences are analyzed and new closed - form expressions of mai of the cdma systems are derived in terms of aperiodic partial correlation of variable - length sequences . then , the self - interference ( si ) , mai and bit - error - rate ( ber ) performance of the desired user in a multi - rate cdma system are analyzed
   本文首先分析了正交變長(zhǎng)擴(kuò)頻序列的相關(guān)特性，導(dǎo)出了以變長(zhǎng)序列非周期部分相關(guān)表示的cdma系統(tǒng)多址干擾( mai )新的分析表達(dá)式，并分析了多速率碼分多址系統(tǒng)中，期望用戶的自干擾( si ) 、多址干擾和誤比特( ber )性能。
3. Concerning with the direct sequence ( ds ) cdma system , this thesis focuses on several issues related to orthogonal spreading sequences and amc , including correlation properties of orthogonal variable - length spreading sequences and their effects on ds cdma system performance , performance of multicarrier ( mc ) ds cdma system with generalized orthogonal ( go ) sequences , adaptive modulation with throughput maximization , performance of adaptive turbo - qam coded modulation in generalized fading channel and performance of amc in wcdma high speed downlink packet access ( hsdpa )
   針對(duì)直接序列碼分多址( dscdma )系統(tǒng)，本文主要研究了正交擴(kuò)頻序列和自適應(yīng)調(diào)制編碼若干問(wèn)題，包括正交變長(zhǎng)擴(kuò)頻序列的相關(guān)性及其對(duì)dscdma系統(tǒng)性能的影響、采用廣義正交( go )序列的多載波直接序列碼分多址( mcdscdma )系統(tǒng)性能、吞吐量最大化自適應(yīng)調(diào)制、自適應(yīng)turbo - qam編碼調(diào)制在廣義衰落信道中的性能，以及wcdma下行分組接入( hsdpa )中自適應(yīng)調(diào)制與編碼性能五個(gè)方面。
4. It's difficult to find orthogonal variables in a sentence. 用orthogonal variables造句挺難的