A new channel interleaving method, called chip interleaving, for direct sequence code division multiple access (DS-CDMA) mobile radio is proposed. Chip interleaver scrambles the chips and transforms the transmission channel into a highly time-selective or highly memoryless channel. It was found that the turbo decoding performance which degrades in a fading channel is significantly improved with...

In this paper interleaver design for bit-interleaved coded modulation and systems with channel-state information at the transmitter is investigated. Based on the bit level capacities of an equivalent channel model an advantageous interleaver design is proposed. Understanding the varying level capacities as the result of a “fading” process, suited bit metric arrangements in the decoder can signi...

Yang, Jinwha. Ph.D., Purdue University, May, 2004. A Study of Error-Resilient Interleaving with Applications in the Transmission of Compressed Images and Video. Major Professor: Edward J. Delp. Three interleaving algorithms are developed and evaluated to improve the quality of compressed images or video delivered over error-prone channels. The algorithms operate on macroblocks (MB), the multipl...

Communication devices such as 60GHz-band receivers and serial links demand power-efficient low-resolution gigahertz-sampling-rate ADCs. However, the energy efficiency of ADCs is degraded by scaling up transistor widths in the building blocks for high speed, thus increasing the impact of intrinsic parasitics. Parallel schemes like multi-bit processing and interleaving [1], can ease the problems ...

Time interleaving is a technique that allows the use of multiple identical analog-to-digital converters1 (ADCs) to process regular sample data series at a faster rate than the operating sample rate of each individual data converter. In very simple terms, time interleaving (IL) consists of time multiplexing a parallel array of M identical ADCs, as shown in Figure 1, to achieve a higher net sampl...

The bit error rate of a coded Multiuser OFDM (M-OFDM) system and coded Multicarrier CDMA (MC-CDMA) system with multiuser detection is analyzed. The paper focuses on downlink wireless applications, where the channel suffers from frequency-selective fading. We investigate both systems when long time interleaving is possible, though introducing large delays, and when time interleaving is limited. ...

We introduce two independent approaches for phase noise suppression. The dominant effects, responsible for the degradation of an OFDM system performance, if phase noise is present, are identified. We found out, that the system performance is strongly influenced by certain phase noise realizations, which cause burst errors, resulting in the performance error floor. Consideration of the system ca...

Abstract In direct sequence code division multiple access (DS-CDMA) and multi-carrier (MC)-CDMA, frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can be applied to exploit the channel frequency-selectivity and to improve bit error rate (BER) performance. In MC-CDMA uplink, however, the BER performance significantly degrades due to strong multi-user interfe...