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

... power consumption of the DSP. In addition, parallelism can be used to increase the number of The Application of Programmable DSPs in Mobile Communications18 Figure 2.5 Power dissipation trends in DSP 1976, ... in GSM, in ’Applications of Digital Signal Processing’, Proceedings of DSP9 4 UK, 1994, and in Technologist Proceedings, Herzlya, Israel, November 1995. The History of DSP Based A...

Ngày tải lên: 01/07/2014, 17:20

... 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 ... with a DSP was also achieved by memory mapping the device, by allowing block data transfers for input and/or output to be simultaneous with decoding, and by providing various signal lines fo...

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... focusing on signal processing DSP designers have put programmable DSPs at the heart of many consumer devices, including mobile communica- tion systems. Recently DSPs have been specialized to ... past and in the future. We highlight different perspectives, especially regarding implementation issues, in the processing of speech, audio, video, future multimedia and location-based services as ....

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... 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 CDMA Code Division Multiple Access DBB Digital Base Band DLL Delay Locked Loop DSP Digital Signal Processor ETSI European Telecommunications Standards Institute FDD Frequency Di...

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... Application of Programmable DSPs in Mobile Communications78 direct path (path 0) so that t k is the differential multipath delay between the reflected path and the direct path. (This forces t 0 ¼ ... and flexibility to make hosting them in ASICs difficult. They are ideal however for a sufficiently powerful DSP. With the growing popularity and flexibility of software radios, DSPs will continue to...

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... 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 ... transceivers for different modes (RF bands). This ‘‘ velcro radio’’ leads to problems with handset size and cost. On the other hand, digital-based multimode compo- nents face the challenge of provi...

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... real-time DSP in an application, the implemen- tation of a DSP solution involves the use of many ingredients: analog to digital converters, digital to analog converters, ASIC, memories, DSPs, microcontrollers, ... therefore 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 Enabling Multi...

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... part our ongoing work carried out around a distributed Jvm 1 in the context of multimedia applications. This distrib- uted Jvm first permits the use of a DSP to a Java application and second exploits ... permit the use of the DSP as another processor to execute Java code and secondly to exploit the DSP low The Application of Programmable DSPs in Mobile Communications132 Figure 8.1 Distri...

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... 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 differ- ence that ... of immediately preceding samples: ~ sðnÞ¼ X p k¼1 aðkÞ sðn 2 kÞ; where ~ sðnÞ is the predicted value of s(n), a(k), 1 # k # p are the predictor coefficients, and p is the order of the predict...

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... 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’’) ... continuous digits grammar 22.7 MIPS One digit grammar † Continuous speech recognition on speaker-independent models, such as digits and commands. † Speaker-dependent enrollment, such as n...

Ngày tải lên: 01/07/2014, 17:20