Công nghệ SDR trong truyền thông di động trên thế giới

Những xu hướng công nghệ mới trong xử lý nước rác trên thế giới và việt nam, định hướng tiếp cận phù hợp với điều kiện việt nam

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Tìm Hiểu Về SC - FDMA Trong Truyền Thông Di Động

... chiếm giữ Ta gọi mapping sóng mang localized SC- FDMA localized FDMA ( LFDMA) gọi mapping distributed distributed FDMA (DFDMA) IFDMA trường hợp đặc biệt SC- FDMA hiệu chỗ phát điều chế tín hiệu hoàn ... mẫu SC- FDMA OFDMA có đầu vào điều chế QPSK, nắn dạng xung Về tổng thể, ba kỹ thuật mapping sóng mang đơn sóng mang cho công suất đỉnh thấp OFMD 3.4 SC- FDMA OFDMA Hình cho thấy phát OFDMA SC- FDMA ... hệ thống MIMO SC- FDMA ghép kênh không gian Một sơ đồ khối hệ thống MIMO SC- FDMA ghép kênh không gian biểu di n Hình 21 5.2 SC- FDMA phân tập không gian Trong kỹ thuật này, tín hiệu truyền từ nhiều...

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Áp dụng DSP lập trình trong truyền thông di động P1 ppt

... increasing need for function diversiﬁcation will drive the programmable DSP into an even more integrated role within the mobile devices of tomorrow Nonprogrammable DSP architectures will have ... communicates audio information A display unit of some sort could be connected to the user’s eye glasses for communicating visual data And beyond these fairly new applications, medical sensors ... signal processing DSP designers have put programmable DSPs at the heart of many consumer devices, including mobile communication systems Recently DSPs have been specialized to perform speciﬁcally...

Áp dụng DSP lập trình trong truyền thông di động P2 pdf

... of DSP, without the associated design cost † DSPs are multitasking devices A DSP is a general purpose device As process technology improves, two different functions that were performed on two DSPs, ... modems, digital still camera, and solid-state audio players As was mentioned in Section 2.2, the power difference between DSP and ASIC solutions was signiﬁcantly reduced by designing the DSP for ... generation (1G) The standards deployed in the 1990s were digital Time Division Multiple Access (TDMA), FDMA, Frequency Division Duplex (FDD) or Code Division Multiple Access (CDMA) These standards enabled...

Áp dụng DSP lập trình trong truyền thông di động P3 ppsx

... to the DSP through a standardized interface Therefore TCCs beneﬁt from the DSP addressing capability, DSP address/data bus bandwidth, internal registers and common DSP memory space Additionally ... Channel Code Division Multiple Access Digital Base Band Delay Locked Loop Digital Signal Processor European Telecommunications Standards Institute Frequency Division Duplex General Packet Radio Service ... Also, parallel scheduling of tasks on the DSP and TCC will be difﬁcult, as the DSP will interrupt its task after a few cycles to service the TCC Therefore the DSP will generally freeze during the...

Áp dụng DSP lập trình trong truyền thông di động P4 pdf

... they are closely related The most DSP intensive functions are the two types of channel decoding: convolutional decoding and turbo decoding Convolutional encoding is used for low data rate frames ... Memory C64x (MHz) Symbol rate encoding a Symbol rate decoding (excluding convolutional and turbo decoders) b Convolutional decoder Turbo decoder Total DSP only Total DSP coprocessors C64x FCPs (MHz) ... processing functions are as follows: † FEC channel encoding and decoding: this can include a CRC, convolutional and turbo encoding/decoding; † Interleaving/de-interleaving: there can be two levels...

Áp dụng DSP lập trình trong truyền thông di động P5 pptx

... DSP solutions In many implementations the application of the linear combining weights as well as the computation of those weights are computed in real time in dedicated DSP hardware A block diagram ... vector v, indicates that the elements of the vector are placed in the diagonal of a square diagonal matrix of appropriate size For a matrix, the convention is adopted that dðMÞ is a diagonal matrix ... the consideration of algorithms that employ simple gradient descent techniques By perturbing the weights in the direction of the negative gradient of the MSE objective function, the MSE can be...

Áp dụng DSP lập trình trong truyền thông di động P6 pptx

... the digital domain 6.3 Digitizing Today’s Analog Operations Digitizing operations currently performed in analog requires moving the Analog to Digital Converter (ADC) ever closer to the radio’s ... same piece of hardware with different parameters in different modes, whereas the second implies using the same piece of hardware for different types of processing, at different times The second, ... carrying a different appliance or a different plug-in card for each application The key challenges that must be met in order to match the analog and digital partitioning to the SDR paradigm, are...

Áp dụng DSP lập trình trong truyền thông di động P7 potx

... processing functions (a natural ﬁt for DSP) : the use of a DSP plus a RISC, a RISC on its own or with a DSP co-processor, a DSP on its own or lastly a new integrated DSP/ RISC component The ﬁrst time ... centered more on ‘‘disguising a RISC processor as a DSP ’ or using small DSP coprocessors In the case of the latter, the excess burden of the DSP 110 The Application of Programmable DSPs in Mobile ... types of DSP solutions are emerging; some using dedicated ASIC circuits, others integrating one or more DSPs and/or microcontrollers Since the constraints of software and development differentiation...

Áp dụng DSP lập trình trong truyền thông di động P8 ppt

... distributed Jvm in the context of multimedia applications This distributed Jvm ﬁrst permits the use of a DSP to a Java application and second exploits the energy consumption features of the DSP ... performance 8.4.3 Distribution of Tasks and Management of Soft Real-Time Constraints Regarding the execution, our basic approach is to design a distribution rule that will transparently distribute the ... is to distribute treatments according to their respective energy consumption In the case of the OMAP TM platform, the use of the DSP results in a decrease in the energy consumption for all DSP- based...

Áp dụng DSP lập trình trong truyền thông di động P9 pot

... applications Improved coding efﬁciency can be obtained by coding the difference between consecutive samples, using a method called differential PCM (DPCM) In predictive coding, the difference that is ... various speech coding standards, and discuss issues relating to their implementation on DSPs 9.2 Speech Coder Attributes Speech coding consists of minimizing redundancies present in the digitized speech ... linear predictive coding (LPC) based parametric models We thus limit our discussion to LPC-based parametric coders In the linear prediction approach, the current speech sample s(n) is predicted...

Áp dụng DSP lập trình trong truyền thông di động P10 pptx

... the different conditions The digit utterances consisted of 4-, 7- and 10-digit strings, the commands were 40 call and list management commands (e.g ‘‘return call’’, ‘‘cancel’’, ‘‘review directory’’) ... (SI) isolated digit recognition An SI speech recognizer does not need to be retrained on new speakers Isolated digits imply that the speaker inserts pauses between the individual digits † Speaker-Dependent ... is effectively recorded under six different conditions The three noise conditions were (i) parked (ii) stop-and-go trafﬁc, and (iii) highway trafﬁc For each condition, the windows of the car were...

Áp dụng DSP lập trình trong truyền thông di động P11 ppsx

... entered the audio coding arena with their Window Media Audio (WMA) player 11.3.3 Audio Coding on DSPs Today’s low-power DSPs provide the processing power and on-chip memory to enable audio applications ... within MPEG-4 audio for general audio coding Video and Audio Coding for Mobile Applications 195 the US for DVD and HDTV [17] Other audio codecs include Lucent’s EPAC, AT&T’s PAC, RealAudio’s G2, QDesign’s ... wireless Video and Audio Coding for Mobile Applications 191 devices, such as digital radios, which will allow the user to receive CD quality audio through a conventional FM radio band For stereo...

Áp dụng DSP lập trình trong truyền thông di động P12 doc

... consequence, with unpredictable time of answer (distributed platform: e.g connected wireless) In addition, the use of status events allows the application to react immediately to unexpected events ... is possible to download on the DBB data such as media files (video, audio – for example ringing melodies) The DBB will then handle some multimedia tasks, so it will have limited e-content applications ... 12.2.1 Security Paradigm Alternatives Building a secure framework is a complex task Two approaches can be envisaged The first approach, which can be called ‘‘fine-grained security paradigm’’, implies...

Áp dụng DSP lập trình trong truyền thông di động P13 docx

... repeated attempts to gain access, or recording of the user’s voice However, recording of a user’s voice can be remedied by prompting the user to say different phrases each time a system performs ... Application of Programmable DSPs in Mobile Communications 222 This type of curve indicates that a verification system may operate over a variety of conditions, depending on the relative costs of ... best treated for this discussion as two different kinds of specifications that are associated with two different implementations of fingerprint authentication systems, as discussed earlier in this...

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