Since 1990 certain health claims in the labelling and marketing of food products have been allowed in Sweden within the food sector’s Code of Practice. The rules were developed in close dialogue with the authorities. The legal basis was a decision by the authorities not to apply the medicinal products’ legislation to ‘‘foods normally found on the dinner table’’ provided the rules defined in the...

Orthogonal Modulation and FEC Rupert Herzog, Andreas Schmidbauer and Joachim Hagenauer Department of Communications Engineering (LNT), Technical University of Munich (TUM), Arcisstr. 21, D-80290 Munich, Germany email: frupert, andreas, [email protected] ABSTRACT: Iterative decoding is applied to code division multiple access (CDMA) systems with two-stage serial concatenated chan...

In this paper, we investigate the performance of a downlink multiple-input multiple-output (MIMO) multicarrier code division multiple access (MC-CDMA) system employing a receiver with iterative channel estimation (ICE). The MC-CDMA system transmits several data symbols per user and per orthogonal frequency division multiplexing (OFDM) symbol in parallel, with each data symbol being spread with ...

The performance of M-ary optical code division multiple access (OCDMA) is analytically investigated in presence of chromatic dispersion. The study is carried out for single mode dispersion shifted and non dispersion shifted fibers. Walsh code is used as user address. The p-i-n photodetector is used for optoelectronic conversion process. In our proposed model 16 different symbols are modulated w...

A family of codes for low-complexity quasi-synchronous code division multiple access (CDMA) systems is developed in order to eliminate multiuser interference (MUI) completely in the presence of unknown and even rapidly varying multipath. Judiciously designed precomputable symbol-periodic user codes, which we term Lagrange or Vandermonde, and the corresponding linear receivers offer a generaliza...

A minimum overhead secure network coding based on chaotic sequence is presented in this paper. And only the source need to be modified, intermediate nodes implement a classical distributed network code. So the proposed scheme is applied to all the linear network coding. Combine the chaotic sequence with original source information vector, because of the high randomness and the sensitivity to in...

A novel multiuser-interference (MUI)-free code division multiple access (CDMA) transceiver for frequency-selective multipath channels is developed in this paper. Relying on chip-interleaving and zero padded transmissions, orthogonality among different users’ spreading codes is maintained at the receiver even after frequency-selective propagation. As a result, deterministic multiuser separation ...

In this paper, new concatenated inner-differential space-time block code (DSTBC) and outer four-dimensional 8PSK trellis coded modulation (4D-8-PSK-TCM) encoder is designed for wireless MIMO system with Rayleigh fading noise in the absence of channel state information (CSI). The proposed concatenated encoder takes advantage of both the high coding gain from its outer-coder and the ease of the d...

PRIMITIVE RS(n, k ) code with symbols from GF(2") A has codewords of length n = 2" 1. These codes can correct t = (n k)/2 symbol errors, with k information symbols. Time-domain decoding algorithms are attractive candidates for designing universal hardware RS decoders [l], [2 ] . A universal decoder can be used to decode any RS code with any block length and symbol alphabet, up to the limits of ...

Iterative decoding of a serial concatenated coding scheme consisting of an outer convolutional code and M -ary orthogonal Walsh modulation as inner Walsh-Hadamard block code in an OFDM-CDMA system is applied. New aspects arise because OFDM enables the iterative decoding structure to exploit time as well as frequency diversity of a mobile channel. Moreover, the paper points out the low complex s...