51 Research and Design, Electronic Engineers website - Embedded Systems, MCU, DSP, EDA, Test and Measurement, Components, Communications, Power, Microelectronics, Semiconductors

Thursday, October 8th, 2009 at 03:11 | No comments

Categories: DSP

Tags: design, development, DSP, software radio

Short Content: Because the convolution code its encoder is simple, the coding gain high as well as has the very strong correction random error ability, obtained the widespread application in the communications system. Based on biggest likelihood criterion's Viterbi algorithm (VA) is in additive under the white gaussian noise (AWGN) channel the performance best convolution code decoding algorithm, is also commonly used one algorithm [1~2].      Generally speaking, realizes decides Viterbi to decode softly may have three kind of plans to ...

Friday, December 12th, 2008 at 06:22 | No comments

Categories: Communication Networks

Tags: FPGA, radio frequency, receiver, software radio

Short Content: Abstract: Introduced now the satellite positioning system (GNSS) in receiver's antenna size enlargement technology, the software radio technology and FPGA realize the technology, as well as they in two-dimensional ballistic correction blasting fuse (2-DCCF) application. Finally, in the article gave has used in revolving the ball two-dimensional ballistic correction blasting fuse's GPS receiving system's principle of work diagram. Key word: Two-dimensional ballistic correction blasting fuse; Satellite positioning signal receiver; Revolving ball Abstract: In this paper, the beam-forming ...

Monday, November 17th, 2008 at 08:12 | No comments

Categories: EDA/PLD

Tags: DSP, FPGA, OFDM, power amplifier, software radio

Short Content: Introduction Along with wireless communication's development, presented many kinds of pattern correspondence systems, to satisfy the interoperability question, the software radio the thought is proposed. The so-called software radio, its central thought is: Constructs one to have open, standardized, the modular general hardware platform, will correspond each kind of function completes through the software, and causes wide band A/D and the D/A switch approaches the antenna as far as possible, develops has highly the flexibility, the open new generation wireless ...

Monday, November 3rd, 2008 at 03:42 | No comments

Categories: DSP

Tags: digit filter, DSP, FSK, modulation and demodulation, software radio

Short Content: Abstract: Obtained the widespread application based on the DSP software radio technology in the correspondence domain. We used TI Corporation's TMS320C5420DSP chip success to design one kind of compatible 2FSK, DPSK, QAM and so on many kinds of modulation demodulation way JH5001 correspondence principle experiment system, in system hardware invariable situation, so long as revised DSP the software processing part to be able to realize the wireless parameter change and to increase the new function. Introduced in detail realizes the ...

Sunday, November 2nd, 2008 at 03:16 | No comments

Categories: DSP

Tags: DSP, hypothesized instrument, modem, software radio

Short Content: Abstract: The design has realized a set based on the software radio the software MODEM experiment system, this system hardware take TMS320C6711 digital signal processor (DSP) as a core, realizes the software radio multi-service pattern modulation demodulation function, and designs the hardware interface to complete with the main engine real-time communication. Designs the hypothesized instrument control in the main engine to demonstrate the platform, realized to modulated the demodulation service pattern the real-time choice and the measured data real time ...

Tuesday, September 23rd, 2008 at 11:50 | No comments

Categories: DSP

Tags: DSP, software radio, TigerSHARC201

Short Content: Abstract: This article introduced one kind of general software radio platform, this platform take high performance DSP as the data processing core, the use high speed serial interface carries on the data dispatch, unifies the periphery FPGA and high speed A/D, D/A, may apply in many kinds of service pattern wireless communication systems. In the concrete discussion platform's overall construction design and in the platform data dispatch plan's foundation, this article gave has realized a direct sequence spread spectrum communications ...

Saturday, August 23rd, 2008 at 07:56 | No comments

Categories: EDA/PLD

Tags: digit filter, FPGA, modem, software radio

Short Content:     This article take 16-QAM the RF firing data pump's design as an example, introduced that uses the FPGA design digit filter's skill and the component choice method, explained carries out when the distributed computing FPGA compared to DSP superior place. All digital logic basic structure 16-QAM modulator Code and element mapping The square root rises the cosine filter Design tactics 5 MHz carriers Distributed computing (DA) technology Filter's realization     Designs the ...