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In this paper, a Type-II flexible Hybrid ARQ (HARQ) scheme using half-rate invertible BCH codes is proposed and analyzed. According to the new scheme, the received frames which contains the same information bits are first combined according to Averaged Diversity Combining (ADC), then the parity frames attempts to recover the information frames by inversion operation. The BCH hybrid decoding is performed...
In this paper, a new type-II hybrid ARQ (HARQ) scheme based on TCM and concatenated codes is proposed and evaluated. The new scheme is divided into two major steps which are BCH processing and turbo processing. Firstly, information bits are transmitted using TCM and then the incremental parity bits based on BCH codes are transmitted upon the reception of NAK. Secondly, the incremental redundancy (IR)...
In the traditional P parameters algorithm based on single channel, a certain carrier residual excursion must be retained. However, the residual excursion is not beneficial to the later recognition and demodulation process at a low-frequency stage. In order to overcome these shortcomings, an algorithm based on inphase and quadrature channels for USB (upper sideband modulation), LSB (lower sideband...
In this paper, a new class of algebraic rate-compatible (ARC) codes is presented and its applications to packet networks are considered. The ARC codes can be encoded incrementally using Chinese remained theory and can be decoded using Gaussian elimination. The new codes cover a wide range of code rate from frac{1}{2} to 1 and are perfect rate compatible in this range. When operated on erasure channel,...
We propose the spectrum allocation and resource scheduling algorithms in cognitive point to multipoint (PMP) networks with rapid changes of spectrum opportunities and present a media access control (MAC) protocol based on these algorithms. The objective of spectrum allocation is to make efficient use of the spectrum while maintaining the transceiver synchronization on frequency and time in the network...
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