With the increasing of the number of parallel channels , the throughput of system can be improved and the transmission delay can be decreased . at the same time , the buffer of the receiver can be also reduced 而且通过增加并行操作的子信道数，可以做到提高吞吐量，减少传输时延的作用，同时还能降低接收端对缓冲容量的要求。
Later in 1990 ' s they were rediscovered and soon became the focus in channel code fields because of their remarkable performance close to shannon limit with iterative decoding and their structures for parallel decoding 90年代中后期的重新研究发现,它采用迭代译码算法时表现出接近香农限的优异性能,且译码算法可以并行操作,因此迅速成为近年来通信编码领域的研究热点。
A strategy locking constraint resources using " write lock " and " read lock " is presented to consider the time delay of data transmission and improve the efficiency of concurrent operation , the realization of main algorithms for constraint network solving is given 提出了“写锁”和“读锁” 2种加锁状态的约束资源的锁定策略，来考虑网络传输的延时性和提高并行操作的效率，并给出了主要算法的实现说明。
Vliw architecture integrates many executing units . the parallel working of these executing units greatly progressed the performance of dsp . this kind of dsp is more and more widely used in multi channel high - speed digital signal process Vliw体系结构的dsp是近几年出现的一种高性能dsp ， vliw体系结构在一块dsp中集成多个执行单元，多个执行单元并行操作，极大地提高了dsp的性能，越来越多地用于多通道高速数字信号处理。
Combining the principles of pipelining and parallelism of dsp with idct theory , we concentrate on the use of multiply - accumulate unit of mcf5272 by merging the operations of addition and multiplication , and realize two dimension of idct with one dimension of idct efficiently . testing shows the software meets the requirement of real - time decoder 重点结合mcf5272的流水线操作和并行操作特征和反离散余弦变换算法原理，将的二维反离散余弦变换转换成8点的一维反离散余弦变换，利用乘法累加器合并加法运算和乘法运算高效快速地实现了反离散余弦变换算法。
