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发明公开
CN101931416A 移动数字多媒体广播系统中的LDPC码的并行分层译码器 无效 - 撤回

移动数字多媒体广播系统中的LDPC码的并行分层译码器
摘要：
本发明公开了一种用于移动数字多媒体广播系统中LDPC码的并行分层译码器，该并行分层译码器采用部分并行结构，其特征在于，1)将校验矩阵的每一行作为一层(layer)，对于每个变量节点依次进行各层的校验节点更新，变量节点在每层校验节点更新之后都将被更新，以更新之后的值参加下一层校验节点的更新，直至一次迭代结束。2)在满足1)的条件下，选择若干行的校验节点并行计算，从而可实现部分并行的译码结构。本发明相对于传统的LDPC译码器的优点在于：在相同的信噪比、相同的最大迭代次数条件下，达到译码收敛条件(BER≤10-6)所需的平均迭代次数更少，误码性能更好，可大大提高译码吞吐率或有效的降低功耗，并提高系统的误码性能。
摘要（英）：

The invention discloses a parallel hierarchical decoder for a low density parity code (LDPC) in a mobile digital multimedia broadcasting system. The parallel hierarchical decoder adopts a partially parallel structure and is characterized in that: 1) each line of a check matrix is taken as a layer, check nodes of each layer are updated sequentially for each variable node, the variable node is updated after the check nodes of each layer are updated and a value obtained after updating is used in the updating of the check nodes of a next layer until an iteration is finished; and 2) the check nodes of a plurality of lines are selected for parallel computation under the condition that 1) is met, so that a partially parallel decoding structure can be realized. Compared with the conventional LDPC decoder, the parallel hierarchical decoder has the advantages of reducing average iteration times needed when a decoding convergence condition [bit error rate (BER) is less than or equal to 10 to 6] is met under the condition of the same signal to noise ratio and the same maximum iteration time, achieving higher error code performance, greatly increasing decoding throughput rate or effectively reducing power consumption and improving the error code performance of a system.

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