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To reduce inter-symbol-interference (ISI) in underwater acoustic channels, a communication system based on joint LDPC-DQPSK iterative detection was proposed. Spread spectrum technology was adopted to increase communication distance and to combat multi-path effect. Joint LDPC-DQPSK iteration is essentially a joint demodulation and decoding iterative detection based on Turbo principle. To verify BER...
In this paper, in order to improve bit error performance, bandwidth efficiency and reduction of complexity compared to related schemes such as turbo codes, we combine low-density parity-check (LDPC) codes and continuous phase modulation (CPM) and introduce a new scheme, called LDPC coded CPM (LDPCC-CPM). At the receiver, an iterative detection method based on SISO algorithm is proposed. Then the effect...
To extract the target location correctly in PHD based multi-target tracking algorithm, an improved peak extraction algorithm was proposed. This new algorithm stemmed from the CLEAN technique in radar signal processing. By finding the highest peak in every iteration, the assumed target was extracted and its corresponding location information was obtained. Simulation results prove the efficiency and...
Continuous Phase Modulation (CPM) provides an attractive option for spectral efficient communication systems. Low-Density Parity-Check Code (LDPCC) combined with CPM has a potential to result in a spectrally efficient scheme that is also energy efficient in that it yields low error rates at low signal-to-noise ratios. In this paper we consider the concatenation of a LDPC encoder and a CPM modulator...
Based on the decomposed model of continuous phase modulation (CPM), CPM is divided into a continuous phase encoder (CPE) and a memoryless modulator (MM). Using the memorial and recursive character of CPE, combined with turbo code and random interleaver, the model of Turbo-CPM system is founded. In order to solve the problem of positive feedback during iteration with short frame, a method based on...
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