Browsing by Author "Jeng, Li-Der"

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Performance analysis of block codes in hidden Markov channels
(2008-01-01)
Lee, Chang-Ming
;
Su, Yu. T.
;
Jeng, Li-Der
;
電信工程研究所
;
Institute of Communications Engineering
Most investigations on the effect of channel memory on the performance of block codes use a two-state Gilbert-Elliott (GE) model to describe the channel behavior. As there are circumstances that the channel of concern can not be properly described by the GE model, there are some recent works on coded performance [5-7] that characterize the channel behavior by a general finite-state Markov chain. This letter presents a new efficient systematic approach to analyze the performance of block codes in such a hidden Markov channel (HMC). An application example is given to predict codeword error probability performance of an RS-coded system in a channel with memory. Numerical results are also provided to validate our analytic results.
Space-Time Coding with Multilevel Protection for Multimedia Transmission in MIMO Systems
(2009)
Weng, Jian-Jia
;
Wang, Chung-Hsuan
;
Jeng, Li-Der
;
電信工程研究所
;
Institute of Communications Engineering
In this paper, space-time coding schemes with full transmit diversity are investigated for unequal error protection (UEP). Effective performance indicies are proposed to measure the intrinsic UEP capability of space-time codes, based on which we demonstrate that space-time trellis codes and super-orthogonal space-time trellis codes can be used for UEP as long as the corresponding encoders are properly designed. In addition, UEP convolutional codes are concatenated with space-time block codes to construct another full-diversity UEP scheme which can provide more choices of UEP levels. Finally, good UEP codes are given by a computer search.