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Performance of multicarrier DS CDMA systems
In this paper, we apply a multicarrier signaling technique to a direct-sequence CDMA system, where a data sequence multiplied by a spreading sequence modulates multiple carriers, rather than a single…
Theory of Spread-Spectrum Communications - A Tutorial
- R. Pickholtz, D. Schilling, L. Milstein
- Computer ScienceIEEE Transactions on Communications
- 1 May 1982
It is the intention of this paper to provide a tutorial treatment of the theory of spread-spectrum communications, including a discussion on the applications referred to, on the properties of common spreading sequences, and on techniques that can be used for acquisition and tracking.
Coherent DS-CDMA performance in Nakagami multipath fading
The coherent reception of direct sequence-code division multiple access (DS-CDMA) signals in a multipath fading channel is considered and the channel model assumes independent paths with Nakagami fading statistics is considered, which is a reasonable model for a frequency-selective fading channel.
Capacity-approaching bandwidth-efficient coded modulation schemes based on low-density parity-check codes
The optimized irregular LDPC codes at each level of MLC with multistage decoding (MSD) are able to perform well at signal-to-noise ratios (SNR) very close to the capacity of the additive white Gaussian noise (AWGN) channel.
Performance analysis and code optimization of low density parity-check codes on Rayleigh fading channels
Simulated performance of the optimized irregular LDPC codes and turbo codes on a land mobile channel and the results indicate that at a block size of 3072, irregularLDPC codes can outperform turbo codes over a wide range of mobile speeds.
Interference rejection techniques in spread spectrum communications
- L. Milstein
- 1 June 1988
It is argued that the ability of a spread-spectrum system to withstand interference, both intentional and unintentional, is probably its greatest asset. Any spread spectrum receiver can only suppress…
On the performance of hybrid FEC/ARQ systems using rate compatible punctured turbo (RCPT) codes
The proposed RCPT-ARQ system combines the performance of turbo codes with the frugal use of incremental redundancy inherent in the rate compatible punctured convolutional codes of Hagenauer (1988) to achieve enhanced throughput performance over a nonstationary Gaussian channel.
A noise-whitening approach to multiple access noise rejection .I. Theory and background
Minimum probability of bit error is difficult to achieve in a DS-CDMA receiver. Since multiple-access noise is the sum of many independent random processes, it is reasonable to approximate it by a…
On the accuracy of a first-order Markov model for data transmission on fading channels
- M. Zorzi, R. Rao, L. Milstein
- Computer Science, MathematicsProceedings of ICUPC '95 - 4th IEEE International…
- 6 November 1995
It is shown through analysis and simulation that a first-order Markov process is a good approximation for data-link performance of ARQ protocols.
Comparison of diversity combining techniques for Rayleigh-fading channels
Numerical results indicate that SC2 and SC3 significantly enhances the bit-error rate (BER) performance relative to that achievable with SC, and under certain conditions approaches the performance achieved by MRC or EGG.