Optimal power allocation (PA) and sub-carrier pairing (SP) strategies for a dual-hop amplify-and-forward single-carrier frequency division multiple access network are derived. Frequency domain equalisers based on mini...
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Optimal power allocation (PA) and sub-carrier pairing (SP) strategies for a dual-hop amplify-and-forward single-carrier frequency division multiple access network are derived. Frequency domain equalisers based on minimum mean square error (MMSE) and zero forcing (ZF) criteria are considered. For each equaliser, the problem of joint PA and SP is solved to maximise the system capacity subject to the total network power constraint. The optimality of ordered SP (OSP) and reverse OSP scenarios for MMSE and ZF equalisers, respectively, is proved.
The written-in errors in bit patterned media (BPM) recording systems cause the erroneous bits during the writing process, leading to performance degradation. In previous works, the BPM read/write channel is modeled as...
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ISBN:
(纸本)9786163618238
The written-in errors in bit patterned media (BPM) recording systems cause the erroneous bits during the writing process, leading to performance degradation. In previous works, the BPM read/write channel is modeled as a binary symmetric channel (BSC) with an additive white Gaussian noise (AWGN) channel or the cascaded BSC-AWGN channels. The initial channel information including the written-in errors probability has been proposed for low-densityparitycheck (LDPC) decoder. However, the decoding algorithm remains the same as in the case of AWGN channels. In this work, we show that the crossover probability of BSC channels will affect the check node processing of LDPC codes. Therefore, we modify the check node computation that takes into account of the crossover probability of BSC channels. The simulation results show that the proposed LDPC decoder outperforms the ones with the conventional and modified likelihood function in terms of the bit error rate performance.
The low-density parity check decoder in the digital video broadcasting-second generation terrestrial (DVB-T2) receiver usually uses the sum-product algorithm for better bit error performance. However, the algorithm re...
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ISBN:
(纸本)9781479912919
The low-density parity check decoder in the digital video broadcasting-second generation terrestrial (DVB-T2) receiver usually uses the sum-product algorithm for better bit error performance. However, the algorithm requires estimating noise variance, which is computationally expensive. In this paper, influences of inaccurate estimation of variance are investigated. Based on the simulation results, it is confirmed that a constant SNR may be used in the algorithm with acceptable performance.
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