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- W298327922 abstract "Bit-interleaved coded modulation (BICM) is one of the popular modulation techniques used in most of the existing wireless communication standards, e.g., HSPA,IEEE 802.11a/g/n etc. In BICM, the channel encoder and the modulator are separated by a bit-level interleaver which allows the designer to choose the code rate andthe constellation independently. BICM maximizes the code diversity, and thereforeis better than trellis coded modulation in fading channel. However its flexibility andease of implementation makes it popular in non-fading channel too.In BICM, receiver considers the reliability metrics of the transmitted bit which arecalculated in the form of log likelihood ratios (L-values) and the main goal of thisresearch is to find the probabilistic model of L-values that allows for a simple andaccurate evaluation of the performance of (BER) considering the effect of unequalerror protection.To this end we proceed in two steps. First we replace the exact form of the PDFsof L-values with simple to manipulate Gaussian functions. Next we interpret thesesimplified form into the BER evaluation based on the saddle point approximation. Todeal with multiple terms appearing in the expressions which complicate the solutionof the so-called saddlepoint equation; we use quadratic approximations which lead tothe closed form solutions. The resulting formulas are validated in the case of M-QAMand M-PSK constellation with arbitrary labellings e.g. Gray, Set Partitioning (SP),Modified Set Partitioning Labelling (MSP) and Mixed labelling (ML)." @default.
- W298327922 created "2016-06-24" @default.
- W298327922 creator A5077121193 @default.
- W298327922 date "2010-08-01" @default.
- W298327922 modified "2023-09-27" @default.
- W298327922 title "Modelling Unequal Error Protection in BICM Systems." @default.
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