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In this paper, we propose a new QAPM scheme for improving power efficiency. A proposed QAPM scheme is build on QAM. And BER performance of QAPM is better than existing PSSK because BER performance of QAM is better than PSK. In this paper, we find the BER performance closed form of QAPM modulation. Also, we compare to PSSK and QAPM with regard to BER performance and throughput in AWGN channel.
In order to retrieve the pre-estimated information from the received signals, it is necessary to estimate the variance of AWGN channel during the initialization of Turbo iterative decoder. Some literature has been devoted to this problem in BPSK/8PSK scenarios, and in this paper, we present another low-complexity blind SNR estimation method based on empirical characteristic functionpsilas derivative...
Modern communication systems are required to provide services based on high data rates burst-mode packet-data transmission, capable of operating at very low SNR conditions. Turbo codes enable the operation at low SNR, close to the Shannon limit. However, carrier frequency and phase synchronization, needed for optimal coherent performance of the receiver, still remains a problem in low SNR and short...
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