Abstract The downlink bit error rate (BER) performances of DSand MC-CDMA in a frequency-selective fading channel can be significantly improved by the use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion. However, the uplink BER performance degrades due to strong multi-user interference (MUI) since different users’ signals go through different channels a...

Hamming codes are widely used for the single bit error correction double bit error detection (SEC-DED) which occurred during data transmission process. This paper presents an enhanced detection of double adjacent bit errors and correcting all possible single bit errors in Hamming codes through selective bit placement technique for memory application. Soft errors occur due to the radiation parti...

In this paper the particularities of the interleavers used in the case of the Recursive Systematic Convolutional Code (RSC), n/(n+2) rate, with n=2, unpunctured non-binary turbo codes (NBTC) were described. The interleavers: block, pseudo-random and new interleaving methods are presented. These new interleaving methods were elaborated starting from the particular form of the date accepted by no...

The use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can significantly improve the downlink bit error rate (BER) performances of DSand MCCDMA in a frequency-selective fading channel. However, the uplink BER performance degrades due to a strong multi-user interference (MUI). In this paper, we propose frequency-interleaved spread spectrum (SS) using M...

This work investigates an uplink multiple access technique with Random Access Block Interleaving and Stanford University Interim (SUI) channel model. The crucial requirement is a better Bit-Error Rate performance of the proposed system. The article analyzes and compares the performance of proposed system, taking different block lengths and a different number of users, against that SUI. The simu...

Recent studies suggest that the rate of spatial multi-bit soft errors will increase with future technology scaling. Unfortunately, multi-bit errors cannot be effectively mitigated with conventional techniques in L1 data caches (e.g., bit interleaving or stronger coding) due to high power and/or latency overheads. We propose the laststore predictor, a lightweight prediction mechanism that accura...

considering a) that voice communications in the HF band use 3 kHz channels; b) that security is essential for some communications; c) that scrambling is the only means of obtaining a sufficient level of security; d) that the required level of security can easily be achieved using digitized speech technology; e) that there is therefore a need for speech signal coders (vocoders) associated with H...

It is shown that while the mutual information curves for coded modulation (CM) and bit interleaved coded modulation (BICM) overlap in the case of a single input single output channel, the same is not true in multiple input multiple output (MIMO) channels. A method for mitigating fading in the presence of multiple transmit antennas, named coordinate interleaving (CI), is presented as a generaliz...

Although tremendous progress has done in past years on memory designing but still Radiation-induced soft errors is concerned area in the field of soft memories and the single error correction double error detection (SEC-DED) codes are commonly used to give assured memory contents with absence of corrupted scenario. Since SEC-DED codes cannot correct multiple errors, they are often combined with...