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| Abstract: | While channel coding is a standard method of improving a system’s energy efficiency in digital communications, its practice does not extend to high-speed links. Increasing demands in network speeds are placing a large burden on the energy efficiency of high-speed links and render the benefit of channel coding for these systems a timely subject. The low error rates of interest and the presence of residual intersymbol interference (ISI) caused by hardware constraints impede the analysis and simulation of coded high-speed links. Focusing on the residual ISI and combined noise as the dominant error mechanisms, this paper analyses error correlation through concepts of error region, channel signature, and correlation distance. This framework provides a deeper insight into joint error behaviours in high-speed links, extends the range of statistical simulation for coded high-speed links, and provides a case against the use of biased Monte Carlo methods in this setting |
| Description: | International Journal of Enhanced Research in Science Technology & Engineering, Vol. 2 Issue 12, December-2013, pp: (115-124) |
| URI: | http://dyuthi.cusat.ac.in/purl/4184 |
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| An efficient sc ... on Monte Carlo Method.pdf | (734.6Kb) |
| Abstract: | Coded OFDM is a transmission technique that is used in many practical communication systems. In a coded OFDM system, source data are coded, interleaved and multiplexed for transmission over many frequency sub-channels. In a conventional coded OFDM system, the transmission power of each subcarrier is the same regardless of the channel condition. However, some subcarrier can suffer deep fading with multi-paths and the power allocated to the faded subcarrier is likely to be wasted. In this paper, we compute the FER and BER bounds of a coded OFDM system given as convex functions for a given channel coder, inter-leaver and channel response. The power optimization is shown to be a convex optimization problem that can be solved numerically with great efficiency. With the proposed power optimization scheme, near-optimum power allocation for a given coded OFDM system and channel response to minimize FER or BER under a constant transmission power constraint is obtained |
| Description: | International Journal of Scientific and Research Publications, Volume 4, Issue 1, January 2014 |
| URI: | http://dyuthi.cusat.ac.in/purl/4186 |
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| A Numerically e ... nimum frame error rate.pdf | (208.4Kb) |
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