Estimation Method of Non-integer Multipath Delay

Abstract

The embodiment of the invention provides a method for estimating non-integral-multiple multi-path time delay. The method comprises the following steps: after a channel impulse response is acquired, determining a position m at which chromatic dispersion occurs when a plurality of paths with chromatic dispersion exist in a channel; determining a path with maximum energy in the chromatic dispersion paths; using the path with the maximum energy in the chromatic dispersion paths as a first center, setting a matching window according to a chromatic dispersion range, and acquiring a measuring sample point set; using time delay corresponding to the path with the maximum energy in the chromatic dispersion paths as a second center, and using a predetermined number of sampling periods T before the second center and a predetermined number of sampling periods T after the second center as a time delay traversing range; performing traversing in the time delay traversing range by taking predetermined accuracy as a step; acquiring a group of local sampling point set through a sinc function according to the matching window and a traversing time delay point; performing correlation matching according to the measuring sample point set and the local sampling point set, and acquiring a traversing step number k when a normalized correlation peak value is maximum after traversing is finished; and calculating multi-path time delay tau of the paths with the chromatic dispersion according to the position m, the traversing step number k and the sampling periods T.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method for estimating non-integer multipath time delay. Background technique [0002] Channel measurement is the first step to obtain channel characteristics, and the channel transfer function and channel impulse response are obtained through real measurement data. The original channel measurement includes the objective physical channel and the response of the measurement system. Observing the channel impulse response that eliminates the measurement system response, there are still dispersion points around the highest peak, which is different from the non-dispersion impulse response presented when the system is directly connected. The reason is that when the multipath delay occurs at a non-integer multiple sampling interval, compared with the precise sampling time, the data collected by the receiver will have sampling dispersion, that is, sampling dispersion at non-in...

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Problems solved by technology

[0004] In actual measurement, sampling dispersion will cause non-ideal impulse response characteristics

If you want to obtain all the multipath information in the channel, you need to ensure a sufficiently high sampling rate to collect data, that is, the sampling period must be very small, smaller than the minimum delay difference, but this will lead to an excessively high sampling rate, which is not easy accomplish

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