Abstract
This article presents the results of a study on the noise immunity of DVB channels when higher-order M-ary APSK modulation schemes and concatenated BCH-LDPC codes are used. Dependencies to determine the probability at the decoder output are given taking into consideration the BCH and LDPC code parameters and the error probability in the communication channel. The influence of the BCH packets length, the BCH code rate, the number of maximum iteration and the parameters of LDPC parity-check matrix on the code efficiency is analyzed. Research of the influence of the concatenated LDPC-BCH code parameters on the radio channel noise immunity is conducted and dependencies to determine the required CNR at the input of the satellite receiver are given.
Highlights
The design of a digital communication system aims to maximize the transmission bit rate, to minimize the probability of bit error, to minimize the required power, or equivalently, to minimize the required carrier-to-noise ratio, to minimize the required system bandwidth and to minimize the system complexity and cost
For the satellite Digital Video Broadcasting (DVB) channel the typical values of the Carrier-to-Noise Ratio (CNR) are within 10 to 18 dB and providing the required Bit Error Rate (BER) imposes some limitations on the order of the modulation [2, 13]
The results obtained from this study show that in order to provide BER = 10−11 at the BCH decoder output (QEF reception) it is necessary that the BER values at the decoder input do not exceed the following values: 8.81·10−7, for BCH(16200,16136), 1.62·10−5 for BCH(16200,16008) and 4.47·10−5, for BCH(16200,15880)
Summary
The design of a digital communication system aims to maximize the transmission bit rate, to minimize the probability of bit error, to minimize the required power, or equivalently, to minimize the required carrier-to-noise ratio, to minimize the required system bandwidth and to minimize the system complexity and cost. Higher-order M-ary modulation schemes can provide greater spectral efficiency and the high data rate required for either digital multimedia applications or other applications such as point-to-point high data rate backbone connectivity and future Earth observation missions requiring downlink data rates exceeding 1 Gbps In this regard, Amplitude Phase Shift Keying (APSK) represents an attractive modulation scheme for digital transmission over nonlinear satellite channels due to its power and spectral efficiency combined with its inherent robustness against nonlinear distortion. For the satellite DVB channel the typical values of the Carrier-to-Noise Ratio (CNR) are within 10 to 18 dB and providing the required BER imposes some limitations on the order of the modulation [2, 13]. For this purpose they need to adopt advanced predistortion methods in the uplink station [7, 15] to minimize the effect of transponder nonlinearity
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