baseband signal 中文意思是什麼
baseband signal
解釋
基帶信號-
With the established rf front - end system simulation platform, adding the digital modulated baseband signal, this paper simulated the multifold digital modulated signal ’ s transmission, such as 2ask, qpsk, and 16qam. then researches of power compression and phase noise of local oscillation influence the bit error ratio for different modulated system. the designing is satisfied multifold functions request with the high - powered and integrated broadband rf front - end
隨后在建立的寬帶射頻前端通用模擬平臺上，加入基帶數字調制信號，對多種數字調制格式的信號在該通用平臺上的傳輸作了研究，模擬了2ask 、 qpsk和16qam等調制格式信號的發射與接收，研究了功率壓縮和本振相位噪聲對不同調制的誤碼率影響，實現了滿足多種功能要求的寬帶高性能綜合射頻前端的設計。 -
This paper focuses on the blind code synchronization approach and spreading sequences estimation algorithm. the main results can be summarized as follows : 1. both synchronous and asynchronous dsss / bpsk baseband signal models are established
本文重點是對盲碼同步和擴頻碼序列估計的研究，主要的工作成果如下: 1 、分同步和非同步兩種情況建立了dsss / bpsk基帶信號模型，並介紹了二種非合作式擴頻碼序列估計和解擴的方案。 -
When the cur - cuit resets, the chip remains accepting state, works in burst mode, and adopts dpsk modulation mode. it proceeds quadrature - sampled intermediate frequency signal after the ad9057 has converted, then down - converses, despreads and demodulates. the demodulated baseband signal will be sended into scm to dispose through interrupt
上電復位后，晶元處于接收狀態，工作在突發模式下，採用dpsk調制方式，將ad9057轉換完的中頻信號進行復正交取樣後下變頻、解擴、解調，通過中斷將解調完的基帶信號送入單片機處理；處于發送狀態時，可將數據擴頻、調制，經ad9768送出。 -
The carrier wave is modulated directly by the baseband signal at several frequency point in l band and s band. firstly, this paper clarifies the theory of i / q modulation, elaborates evm and acpl, and analyzes the effect of amplitude and phase unbalance and dc offset on evm. secondly we review the basic principle of phase locked loop and it ’ s composing parts, including the basic conception and design method of pll frequency synthesizer, especially introduce the charge pump pll frequency synthesizer in detail
首先，在闡述i / q正交調制基本原理的基礎上，通過對誤差矢量和鄰近通道功率泄漏的詳細分析，定性、定量地討論了各種非理想電路因素（如相位不平衡、幅度不平衡、直流偏差等）對調制器性能的影響;其次，介紹了鎖相環的工作原理和基本組成部分，包括鎖相環的設計和環路濾波器的設計，特別詳述了電荷泵鎖相頻率源;第三，介紹了採用直接調制技術模擬衛星信號的射頻前端的設計;最後，對整個直接射頻調制系統進行測試，結果基本上達到了課題要求。 -
Research on distortionless transmission of digital baseband signal of mine monitoring system
礦用監控系統數字基帶信號無失真傳輸的研究 -
The output of hdlc data package was coded by nrzi, then conducts the modulation of gmsk baseband signal through dsp. the message was correctly analyzed by sabb receiver, which proved the interconnection and intercommunication between apparatus
產生的hdlc數據包通過nrzi編碼后，再通過dsp進行gmsk基帶信號的調制，此消息被sabb接收機正確解析，證明了設備的互連互通。 -
Direct modulator converts baseband signal to rf signal without upconvertion. the system design is relatively simple compared to upconversion. so direct modulator provides adventages of compact size, low cost and low spurious response
直接調制將基帶信號直接轉換為射頻信號，不需要二次頻率變換，與上變頻方式相比系統結構簡單，降低了對濾波器的要求，具有體積小，重量輕，成本低等明顯的優點。 -
Analyze, design and simulate the digital down - convert frequency. first, the analogue if signal is converted to digital if signal in one a / d convertor which used passband sampling theory. the digital if signal is then passed to a pair of digital mixers operating in phase quadrature for mixing the if signal to baseband signal
首先利用帶通采樣定理對中頻模擬信號進行a / d變換后將其混頻到基帶，然後用平方根升餘弦滾降濾波器同時完成低通濾波和匹配濾波雙重作用，以提高解調器的效率。 -
The design and application of ad6640 and ad6624 are fully discussed in this part. the design of software module includes the parameter design for ddc filter and the baseband signal processing of dsp. and the realization of the viterbi channel decoding algorithm by dsp and the simulation of the burst at the transmitter are discussed
模塊的硬體設計主要包括： a d轉換器、數字下變頻器（ ddc ）以及dsp ，詳盡討論了a d器件ad6640和ddc器件ad6624的設計和應用；模塊的軟體設計主要包括： ddc濾波器參數設計和dsp的基帶信號處理，給出了viterbi通道譯碼演算法dsp實現和發射端突發形成的模擬實現。 -
This dissertation, basing on simulation, makes a deep research on simulating signal of gmsk ( gaussian filtered minimun frequency shift keying ) baseband modulation and demodulation in ais ( automatic identification system ) equipment. the technology related in the following makes the modulation and demodulation of baseband signal into realization by ti dsp, at the same time, provides a key technique to develop ais system inland
本文著重對自動識別系統（ ais - automaticidentificationsystem ）設備的高斯濾波最小頻移鍵控（ gmsk - gaussianfilteredminimunfrequencyshiftkeying ）基帶調制解調信號進行了模擬研究，並在模擬的基礎上，在ti的dsp上實現了基帶信號的調制解調，為國內研製ais系統儲備了關鍵技術。 -
There are different ways to make the bit synchronization, for example : the technique of the pilot frequency, the technique of some change about the baseband signal
為了保證在同步傳輸系統中的位同步，有導頻及對基帶信號信號直接變換的方式，直接變換的方式中，使用線路編碼是比較常見的。 -
As the spread spectrum and despread of digitalization are handled on the digital baseband, it is very important to convert medium frequency signal in analogue to digital baseband signal, and the downconverter functions to convert analogue medium frequency to analogue baseband signal, and to digital baseband signal through a / d transformation and decimation filter
所以把模擬的中頻信號變為數字基帶信號的下變頻器就顯得非常重要。在這里下變頻器的作用是將由前一級接收而來的模擬中頻信號變為模擬的基帶信號，再經過a / d轉換和抽取濾波成為數字的基帶信號。 -
Second, the design of hardware module including a / d converter, ddc ( digtial downconverter ) and dsp was illustrated. in this part, the design and application of ad6644, hsp50216 and dsp chips are fully discussed. the design of software module mainly refers to the parameter design for ddc filter and the baseband signal processing of dsp which is realized by some simulation
其次模塊的硬體設計，主要包括： a d轉換器、數字下變頻（ ddc ）以及dsp ，詳盡地介紹了a d轉換器件ad6644 、數字下變頻hsp50216 、 dsp晶元的設計方法，模塊的軟體設計主要是數字下變頻參數的設計和后續基帶信號的處理，並對該系統實現系統模擬。 -
Signal forming and different demodulation of gmsk baseband signal are mainly discussed in the dissertation. gauss filter, phase integral, sin table, matched filter, calculate angle, bit - synchronization 、 output filter 、 a / d 、 d / a and etc of gmsk baseband signal are carefully studied through software emulation in systemview environment. the modulation and demodulation of gmsk baseband signal are carried out by the way of using tms320vc549 of ti to integrate software and hardware
本文重點討論了gmsk基帶信號的形成以及gmsk基帶信號的差分解調，系統在systemview的環境下進行了軟體模擬，通過對系統的模擬工作，仔細的研究了gmsk基帶信號的高斯預濾波器、相位積分、 sin查表、匹配濾波器、相角計算、位同步、幀同步、輸出濾波、 a / d和d / a等。 -
In this process, it is costas that transforms medium signal loaded with data information to baseband signal deprived of carrier
其中，將帶有數據信息的中頻信號變為除去載波的基帶信號由科思塔斯環（ costas ）完成。 -
In order to insure the real - time data, the thesis employs the plan using the high - speed fpga circuit to mainly control and process the baseband signal
為了保證數據實時性，系統使用了高速的fpga器件來進行主控與基帶信息處理的技術實現方案。 -
The thesis expounds the cell design and timing design of the fpga circuit in main controlling and baseband signal processing module, and develops the hardware of it, and programs part of the software
文中詳細闡述了主控與基帶處理單元中fpga模塊設計與時序設計，研製了主控與基帶信息處理單元硬體，編寫了部分調試軟體。 -
Finally, the author has carried on software and hardware design of the similar clutter baseband signal production based on the tms320c6414dsp processor. and confirmed the design feasibility through the simulation experiment
文章最後，基於tms320c6414dsp處理器進行了對類雜波基帶信號生成的軟硬體設計，通過模擬實驗驗證了設計的可行性。 -
The signals of multi - channel sensor at measuring spot were processed and translated by signal encoding technology to fuse into a baseband signal and then the signal was transmitted directly or in frequency - hand mode
該方法利用信號編碼技術對測控現場的多路傳感器信號進行處理和變換，使其融合為一路基帶信號后，或直接以基帶傳輸或以頻帶傳輸。 -
The single dsp can transmit baseband signal to digital up converter and receive baseband sample signal from digital down converter through the control of interrupt signal at the same time. the stability and reliability of complete digital transmission system can be realized by this way
本文利用dsp的中斷控制，在單片dsp內發送基帶數字信號同時處理來自數字下變頻器的基帶數字信號，實現了穩定、可靠的全數字中頻與基帶傳輸系統。
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