CHEST, VOL. 61, NO. 4, APRIL, 1972 3 Martinson FD, Clark BM: Rhinophycomycosis entomophthorae in Nigeria. Amer J Trop Med Hyg 16:40, 1967 4 Cockshott WP, Clark BM, Martinson FD: Upper respiratory infection due to Entornophthora coronata. Radiology 90:1016, 1968 5 Ridley DS, Wise MJ: Unusual disseminated infection with a Phycomycete. J Path Bacter 90:675, 1965 6 Williams AO: Pathology of phycomy...

In this paper, energy efficient VLSI architectures for linear turbo equalization are studied. Linear turbo equalizers exhibit dramatic bit error rate (BER) improvement over conventional equalizers by enabling a form of joint equalization and decoding in which soft information is iteratively exchanged between the equalizer and decoder. However, turbo equalizers can be computationally complex and...

Turbo-code is known as the powerful error correcting code. The principle of turbo-code, which is the concatenated convolutional code, makes it possible to control the code rate by the use of the puncturing. When the puncturing is applied, the reliability of the decoded bits is not uniform over a frame, because some bits are decoded using only received information bits, and the others are decode...

In the development of wireless communication system, towards error free coding, turbo coding were effectively been used. Turbo coding has an advantage of error detection based on the parity bit coding which improves the error performance in communication system. In the practical realization of such system, turbo chips were developed embedding onto a communication unit, performing the operation ...

This paper presents a Turbo Multiuser Detector for Turbo-Coded DS-CDMA systems, based on the utilization of a PIC and a bank of turbo decoders, in which the PIC performs interference cancellation after each constituent decoder of the turbo decoding scheme. Moreover, the soft output of turbo decoders are used iteratively to improve the updating step of the channel parameter estimation which is f...

apitalizing on the tremendous per formance gains of turbo codes and the turbo decoding algorithm, turbo equalization is an iterative equalization and decoding technique that can achieve equally impressive performance gains for communication systems that send digital data over channels that require equalization, i.e., those that suffer from intersymbol interference (ISI). In this article, we dis...

Turbo-codes have attracted a great deal of interest since their discovery in 1993. This paper reviews the reasons for this, in particular their attainment of the ultimate limits of the capacity of a communication channel. The paper describes the two fundamental concepts on which they are based: concatenated coding and iterative decoding. This latter is the real ‘turbo-principle’, which is the r...

We consider the problem of turbo multiuser detection for synchronous and asynchronous code-division multiple-access (CDMA) in the presence of unknown users. Turbo multiuser detectors, as previously developed, typically require knowledge of the signature waveforms of all of the users in the system and ignore users whose signature sequences are unknown, e.g., users outside the cell. In this paper...

Parallel turbo decoding is becoming mandatory in order to achieve high throughput and to reduce latency, both crucial in emerging digital communication applications. This paper explores and analyzes parallelism techniques in convolution turbo decoding with the vertibi and MAP algorithm. A two-level structured classification of parallelism techniques is proposed and discussed: SISO decoder level...