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A local linear regression (LLR) based least-square (LS) channel estimation technique for mobile orthogonal frequency division multiplexing (OFDM) communication systems over the doubly selective fading channel is proposed in this paper. In our proposed method, the doubly selective fading channel is firstly estimated via pilots arranged in block-type, comb-type or distributed pilot scheme, piece-wise...
Interleave Division Multiple Access (IDMA) is a multiple access scheme where users are separated by the only means of interleavers. However, IDMA revealed to depend on power optimization because equal power repartition significantly deteriorates the performance when the system is heavy-loaded. Therefore, we propose the application of the genetic annealing Differential Evolution algorithm to SNR evolution...
It is shown in the paper that by employing a maximum ratio combining (MRC) pre-equalizer, the complexity of the receiver in an Interleave-Division Multiple-Access (IDMA) downlink is reduced, while similar or even slightly better performance is achieved, compared to that using Log Likelihood Ratio Combining (LLRC).
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