Nowadays, the energy crisis has forced the need to recover the energy which is normally wasted in industrial processes. Gas pressure reducing process in city or power plant gas stations is one of these processes in which the energy is wasted. This work is done by turbo-expanders in parallel with gas regulating valves. In electrical industry, these devices drive generators to produce electrical ...

In this paper we study adaptive power allocation (PA) policies for improving the performance of convolutional and turbo codes on fading channels. The transmitter has an average power constraint. The fading process can he continuous (e.g. Rayleigh distribution). Perfect channel state information at the transmitter (CSIT) and the receiver (CSIR) are assumed. For convolutional codes, we consider b...

In this paper, the integration of power control and turbo coding is adopted to achieve reliable communications over Ka-band code-division multiple-access (CDMA)-based low earth orbit (LEO) satellite systems. The effect of imperfect power control on the bit error ratio (BER) performance is analyzed, and the upper bounds on BER are also derived for the case of slow and fast imperfect power contro...

The application of turbo codes in modern communication systems makes decoding a time and power consuming task. It is known that analog decoder are superior to digital decoder designs in terms of speed and power consumption. The fact that a modification of a single code parameter like the block length requires a new analog decoder implementation, in combination with a complexity, which grows lin...

1 In a conventional communication system with a turbo decoder, the received signal strength is measured at the receiver front end, but not the noise-power spectral density. Hence, the accuracy of the estimated bit energy-to-noise-spectral-density ratio can be poor, which degrades the turbo decoder. This paper presents an efficient iterative code-division multiple-access direct-sequence system t...

In this paper, turbo ARQ scheme is proposed and simulated for a high-speed power line communication system. Packet error performance is substantially improved by increasing the number of iterations in the turbo decoding process and interleaver length of a turbo encoder. It is confirmed that the Type I hybrid ARQ with SI (soft information) performs better than Type I hybrid ARQ without SI becaus...

OF THE THESIS Constant-Envelope Modulation Schemes with Turbo Coding By Nistha Tandiya Master of Science in Electrical Engineering University of California, Irvine, 2015 Professor Ender Ayanoglu, Chair The communication infrastructure is one of the biggest energy consumers in the world. With the expected exponential growth in the demand for wireless traffic, it becomes the foremost priority to ...

A new type of iterative decoders based on analog computing networks, which are used to decode powerful error-correcting schemes, such as Turbo and Low-density parity-check (LDPC) codes, outperform their digital counterparts in terms of power consumption and speed. Only few analog Turbo decoders, all of them based on CMOS subthreshold technology have been implemented till now. This paper aims to...