Repositioning of equalizer tap-gain coefficients专利检索-抽头系数信号处理专利检索查询-专利查询网

Repositioning of equalizer tap-gain coefficients

阅读：275发布：2022-10-13

专利汇可以提供Repositioning of equalizer tap-gain coefficients专利检索，专利查询，专利分析的服务。并且Start-up performance of an automatic transversal equalizer is enhanced when known, but unsynchronized, pseudorandom test words having substantially as many elements as there are equalizer taps are correlated at the receiver location in a digital data transmission system to obtain an ordered set of tap-gain coefficients of sufficient precision to open the received eye pattern. The largest tap-gain coefficient of the ordered set thus derived is rapidly ascertained and aligned with a predetermined reference tap position entirely by digital means. The technique is readily adapted to phase-modulated and quadrature amplitudemodulated data systems where quadrature-related coefficient sets, i.e., the coefficients are complex numbers, are required.，下面是Repositioning of equalizer tap-gain coefficients专利的具体信息内容。

权利要求

1. In combination with a multitap automatic transversal equalizer for which an initial ordered set of tap-gain coefficient words has been determined but the largest of which is required to be aligned with a preferred reference tap location, a multiword storage medium for a sequence of tap-gain coefficient words in digital form, input and output holding registers for said storage medium, means for comparing the difference in magnitude between words held in the respective input and output registers, switching means responsive to said comparing means for directing the contents of either the output or input registers into the input register in accordance with the larger magnitude thereof, means for sequentially transferring the coefficient words into said output register until all such coefficient words have circulated therethrough for comparison with the contents of said input register to determine the largest such coefficient word, and means for shifting all said coefficient words through said multiword medium by a predetermined amount such that said largest coefficient word is stored in a position corresponding to the preferred reference location of said equalizer.

2. The combination defined in claim 1 in which said transversal equalizer employs more than one ordered set of tap-gain coefficient words requiring the alignment of the largest of at least one set with a preferred reference tap location, said multiword storage medium comprises separate storage sections for each of said ordered sets of tap-gain coefficients, input and output holding registers are provided for each of said storage sections, said comparing means includes a section for each section of said storage medium, said switching means directs the contents of said output registers associated with one section of said storage medium to an input register of another section of said storage medium, said transferring means circulates all said coefficient words through all sections of said storage medium, and said shifting means aligns the largest coefficient of said ordered sets with a position corresponding to a preferred reference location on said equalizer.

3. The combination defined in claim 1 in which said comparing means comprises a two-input serial full adder, and an inverter in series with one input of said adder.

4. The combination defined in claim 1 in which said comparing means comprises a two-input serial full adder, an inverter in series with one input of said adder, the presence of a carry bit in output of said adder indicating the dominance of the noninverted input over the inverted input, and means for applying the carry output of said adder to said switching means.

5. In combination with a multitap automatic transversal equalizer having separate in-phase and quadrature branches for which initial ordered sets of tap-gain coefficient words have been determined but the largest coefficient word is required to be aligned with a preferred reference tap location, multiword storage media for each of the in-phase and quadrature sequences of tap-gain coefficient words in digital form, input and output holding registers for each of said multiword stoRage media, means for comparing the difference in magnitude between words held in the input register associated with the one storage medium and the output register associated with the other storage medium, switching means separately responsive to each of said comparing means for directing the contents of either the input or output registers applied to a particular comparing means into the other input register in accordance with the larger input magnitude thereto, means for sequentially transferring the coefficient words in each of said storage media through the associated output registers until all such coefficient words have been compared with the contents of an input register to determine the largest coefficient word among all such words, and means for shifting all said coefficient words through said multiword storage media by a predetermined amount such that the largest coefficient word of said sets of coefficient words is stored in a position corresponding to the preferred reference location of said equalizer.

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Repositioning of equalizer tap-gain coefficients

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