Recursive systematic convolutional encoders have been shown to play a crucial role in the design of turbo codes. We recall some properties of binary convolutional encoders and apply them to a search for good constituent convolutional codes of turbo codes. Tables of the “best” recursive systematic convolutional encoders found are presented for various rates, together with the average bit-error p...

BACKGROUND AND PURPOSE Current T2-weighted imaging takes >3 minutes to perform, for which the ultrafast transition into driven equilibrium (TIDE) technique may be potentially helpful. This study qualitatively and quantitatively evaluates the imaging of transition into driven equilibrium of the balanced steady-state free precession (TIDE) compared with TSE and turbo gradient spin-echo on T2-weig...

Motor Diesel dipengaruhi oleh beberapa aspek operasional. Diantaranya: waktu pengi­njeksian bahan bakar (timing injection), tekanan (fuel pressure), dan udara yang masuk (boost pressure). Modifikasi akan dilakukan untuk mengubah parameter menggunakan piggyback. Terdapat tiga hal diteliti, yaitu mengamati perubahan pada daya torsi jika fuel pressure, injection timing, turbo. Pengujian meng­gunak...

Modal parameter extraction of high speed shafts is of critical importance in mechanical design of turbo-pumps. Due to the complex geometry and peripheral components of turbo-pumps, difficulties can arise in determination of modal parameters. In this study, modal properties of a turbo-pump shaft, was studied by experimental modal analysis, and using different excitation techniques. An innovative...

A simple serially concatenated turbo code using differential 8PSK modulation as the inner code and a [3,2,2] parity code as the outer code is studied. This inner code allows for noncoherent operation, but is decoded coherently according to turbo principles with iterative exchange of extrinsic probabilities. Results show a turbo cliff at 4.4 dB, about 1.5 dB away from the 8PSK channel capacity. ...

In recent years large scientific interest has been devoted to joint data decoding and parameter estimation techniques. In this paper, iterative turbo decoding joint to channel frequency and phase estimation is proposed. The phase and frequency estimator is embedded into the structure of the turbo decoder itself, keeping into consideration both turbo interleaving and puncturing. Results show tha...

In this paper, a proposed wirelesstransmission model by concatenation of turbo code and precoding of Spiral curve and Dimension Partitioning techniques on QPSK signal through multipath fading channel is introduced. It is a novel method to decrease ISI effect in wireless communications. Simulation results show that Spiral curve precoding with turbo code achieves the best gain at high SNR compare...

An area and computational-time efficient turbo decoder implementation on a reconfigurable processor is presented. The turbo decoder takes advantage of the latest sliding window algorithms to produce a design with minimal storage requirements as well as offering the ability to configure key system parameters via software. The parameter programmability allows the decoder to be used in a research ...

This paper presents an improved soft feedback interference cancelation scheme which is used in matched filtered minimum mean squared error (MF-MMSE) turbo equalization. In the iterative receiver, a kind of combined prior information and a dynamic updating method are adopted to improve the performance. Simulation results show that the proposed scheme can achieve 0.25 to 0.5 dB performance gain o...

Error correcting decoder’s performance is crucial for communication systems. Since the performance of Turbo codes is close to the Shannon limit, ultra high-speed turbo decoder is desired. The aim of this design is to demonstrate the feasibility of implementing high-speed Turbo decoders in analog VLSI using SiGe BiCMOS technology. Detailed conceptual design is presented. Simulation results show ...