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The matrix rectifier described in this paper can realizes three-phase AC voltages to a DC output voltage and can work as a power factor correction converter. The paper presents an SPWM control strategy based on virtual DC link for AC/DC matrix rectifier with high frequency link. The matrix converter in the paper can be equivalent to a virtual rectifier and a virtual inverter. The proposed control...
A novel irregular low density parity check (LDPC) coded link adaptation technique is presented to achieve flexible spectral efficiency and various reliabilities with irregular modulation. The mapping rule between LDPC coded bits and signal constellations is optimized in terms of LDPC code degree distribution and inherent unequal error protection property of irregular modulation. Simulation results...
The irregular modulation (IM) technique was initially proposed in bit-interleaved coded modulation (BICM) for convolutional code and turbo code cases (Schreckenbach and Bauch, 2006), which apply different signal constellations and mappings within one codeword. The IM technique gives a simple method to improve flexibility of BICM, which can also provide an adaptive modulation with fine granularity...
The bit-interleaved coded irregular modulation (BICIM) was initially proposed for convolutional code and turbo code cases, which applies different signal constellations and mappings within one codeword. We firstly extend this idea to irregular LDPC codes and present an optimized mapping rule for LDPC coded irregular modulation according to the code degree distribution. Furthermore, we apply this optimized...
As one of key techniques of 3G and future mobile communication system, link adaptation can significantly increase the spectral efficiency and render various levels of services by changing available power, data rate, modulation and channel coding parameters. In this paper, we focus on 64QAM Gray constellation. A novel algorithm for searching enhanced Hybrid ARQ (HARQ) schemes with constellation rearrangement...
An irregular LDPC coded sub-packet hybrid ARQ (HARQ) scheme based on instantaneous reliability is presented for selection and retransmission. Reliability-based (RB) HARQ was initially proposed for Turbo coded case with iterative decoding, whereas for irregular LDPC coded scenario, a degree distribution based (DDB) retransmission strategy was presented that the nodes with large degree have higher retransmission...
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