Conventional trellis coding outputs one channel symbol per trellis branch. channel symbol combination of performance ga Here we introduce the notion of multiple trellis coding wherein more than one the a per trellis branch is transmitted. It is shown that multiple trellis coding with M-ary modulation yields n with symmetric signal sets comparable to that prev ously achieved only with signal con...

A cyclic minimum variance detector is presented for the blind detection of the higher data rate signals in a multirate asynchronous Direct Sequence Code Division Multiple Access (DS-CDMA) system and which are signaled over a multipath Rayleigh fading channel. The interference viewed by a higher data rate symbol will be periodic in nature due to the presence of a lower data rate symbol, which sp...

In this paper, a computation of the inputredundancy weight enumerator is presented. This is used to improve the theoretical approximation of the information–bit and –symbol error rate, in terms of the channel bit-error rate, in a block transmission through a discrete memoryless channel. Since a bounded distance reproducing encoder is assumed, the computation of the here-called false positive (a...

In this paper we introduce the dual-header pulse interval modulation (DH-PIM) technique employing a simple retransmission coupled with a majority decision detection scheme at the receiver. We analytically investigate the slot error rate (SER) performance and compare results with simulated data for the symbol retransmissions rates of three, four and five, showing a good agreement. We demonstrate...

This letter deals with blind carrier frequency offset estimation based on minimum output variance (MOV) approaches without devoting training sequence and pilot symbol for synchronous multicarrier-code division multiple access (MC-CDMA) systems. It has been shown that the performance of MOV estimator is degraded because the effect of noise and wideband spread-spectrum signals. In conjunction wit...

The development in the late 1980s of two dimensional bar code symbologies capable of storing kilobytes of information in a single symbol and unlimited data in multiple symbols has led to the suggestion that bar code could be used as a medium for transmitting EDI messages. This paper considers whether such a suggestion targets any real business problem and whether such a system would work in pra...

A new tight analytical upper bound is presented for the performance of finite-delay symbol-by-symbol (SBS) Abend–Fritchman-like decoding of trellis-encoded data crossing arbitrary (eventually time-varying) discrete memoryless channels (DMC’s). On the basis of this bound, a related criterion for the optimal design of trellis codes with SBS decoding is then proposed. It gives rise to an effective...

The aim of the Nordic SYMBERED project funded by NUH (the Nordic Development Centre for Rehabilitation Technology) is to develop a user friendly editing tool that makes use of concept coding to produce web pages with flexible graphical symbol support targeted towards people with Augmentative and Alternative Communication (AAC) needs. Documents produced with the editing tool will be in XML/XHTML...

We present a novel framework for the multimodal display of words using topological, appearance, and auditory representations. The methods are designed for effective language training and serve as a learning aid for individuals with dyslexia. Our topological code decomposes the word into its syllables and displays it graphically as a tree structure. The appearance code assigns color attributes a...

In this paper, we present some new codes which have good performance on Rician fading channel with small decoding complexities. First, we propose a new M-way partition chain for the L x MPSK (L < M) signal set which maximizes the intra-set distance of each subset at each partition level. Based on this partition chain, a class of asymptotical optimum codes has heen found. For M = 4, these codes ...