This paper presents some results on adaptive minimum mean-square error (MMSE) turbo equalization obtained from underwater experiments in the Atlantic ocean. The performance gain is evaluated as a function of the number of hydrophones at the receiver side. Single-carrier transmission with high-order modulations is considered, at a coded bit rate as high as 24 kb/s on the underwater acoustic chan...

Error free transmission is the main aim of wireless communication. However nowadays with the increase in multimedia services there is a demand for ever increasing data rates. To reduce the bit error rate forward error correction methods (FEC) methods are now employed. In this paper we compare the BER performance of 16-QAM and 64-QAM modulation techniques with and without interleaving process. A...

This article presents a description of a single-chip implementation o f a Reed-Solomon encoder with interleaving capability. The code used was adapted by the CCSDS (Consulative Committee on Space Data Systems). It forms the outer code of the NASA standard concatenated coding system which includes a convolutional inner code of rate 112 and constraint length 7. The architecture, leading to this s...

Multiple-access interference (MAI) limits the bit error rate (BER) performance of CDMA uplink transmission. In this paper, we propose a generalized chip-interleaved CDMA with 2-dimensional (2D) spreading using orthogonal variable spreading factor (OVSF) codes to minimize the MAI effects and achieve the maximum available timeand frequency-domain diversity gains. We present the code assignment fo...

In this World of Digital era the demand of mobile Internet and wireless multimedia applications are growing faster than ever. To satisfy the user requirements and to overcome the limitations of existing wireless technologies, have led the researchers to come up with more advanced and efficient technology. Orthogonal Frequency Division Multiplexing (OFDM) based WiMAX (Worldwide Interoperability ...

We present an algorithm for computing the residue R = X mod M . The algorithm is based on a sign estimation technique that estimates the sign of a number represented by a carry-sum pair produced by a carry save adder. Given the (n + k)-bit X and the n-bit M , the modular reduction algorithm computes the n-bit residue R in O(k + log n) time, and is particularly useful when the operand size is la...

UNLABELLED This article reviews common methods for two-dimensional display of registered multimodality brain images and describes a software package for presentation of merged MRI and PET images that runs on a workstation with an eight-bit color display. The software package displays merged brain images from multiple modalities in a way that is readily manipulated, visually pleasing and easy to...

In this thesis, we consider the problem of reliable data packets transmission using singlecarrier signaling over frequency-selective fading channels. Our objective is to design enhanced transceivers with improved detection performance in the absence of channel state information at the transmitter by exploiting the available time-diversity in Chase combining Hybrid Automatic Repeat reQuest (HARQ...

Wireless communication systems and Ethernet networks call for moderateresolution GS/s energy-efficient ADCs. While previous work [1] shows that the multi-bit per cycle SAR ADC can achieve low power due to various hardware reduction techniques, there are still a few limitations that restrain this architecture. First, the pre-charge slows down the logic and the DAC settling, especially during the...

1389-1286/$ see front matter 2011 Elsevier B.V doi:10.1016/j.comnet.2011.04.018 ⇑ Corresponding author. E-mail addresses: [email protected] (R. Kunst) (C.B. Both), [email protected] (L.Z. Granville), ju Rochol). Burst and AWGN errors affect mobile WiMAX networks because of propagation conditions generally resulting from the mobility characteristics. Mobile WiMAX networks are inherently v...