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Optimization of signal sets for partial-response channels. I. Numerical techniques

机译:优化部分响应通道的信号集。一,数值技术

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摘要

Given a linear, time-invariant, discrete-time channel, the problem of constructing N input signals of finite length K that maximize minimum l/sub 2/ distance between pairs of outputs is considered. Two constraints on the input signals are considered: a power constraint on each of the N inputs (hard constraint) and an average power constraint over the entire set of inputs (soft constraint). The hard constraint, problem is equivalent to packing N points in an ellipsoid in min(K,N-1) dimensions to maximize the minimum Euclidean distance between pairs of points. Gradient-based numerical algorithms and a constructive technique based on dense lattices are used to find locally optimal solutions to the preceding signal design problems. Two numerical examples are shown for which the average spectrum of an optimized signal set resembles the water pouring spectrum that achieves Shannon capacity, assuming additive white Gaussian noise.
机译:给定一个线性的,时不变的,离散时间的通道,要考虑构造有限长度为K的N个输入信号的问题,这些输入信号使输出对之间的最小L / sub 2 /距离最大化。考虑了对输入信号的两个约束:N个输入中每个输入的功率约束(硬约束)和整个输入组的平均功率约束(软约束)。硬约束问题等效于以min(K,N-1)维将N个点堆积在一个椭球体中,以最大化点对之间的最小欧几里得距离。基于梯度的数值算法和基于密集晶格的构造技术用于找到针对先前信号设计问题的局部最优解。给出了两个数值示例,其中假设加性高斯白噪声,优化信号集的平均频谱类似于达到香农容量的注水频谱。

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