Time-domain channel estimating method under symbol timing error

A time-domain channel estimation and symbol timing error technology, which is applied in the field of communication, can solve the problems that inherent noise and channel trails are difficult to distinguish, inherent noise is difficult to remove, and Gaussian noise is not considered, so that the estimation method is simple, the impact is reduced, and the performance is improved. Effect

Inactive Publication Date: 2006-12-13
SHANGHAI RES CENT FOR WIRELESS COMM
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Problems solved by technology

The forward timing offset usually brings some inherent noise effects generated by the correlation sequence. When the denoising threshold is set according to the estimated SNR, this part of the inherent noise is difficult to remove, and it is regarded as a small path of the channel, resulting in relatively large large channel estimation error
figure 2 is a schematic diagram of the correlation sequence under the forward timing error, such as figure 2 As shown, regardless of Gaussian noise, when there is a timing error of 4 symbols forward, the inherent noise introduced is indistinguishable from the channel trail

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  • Time-domain channel estimating method under symbol timing error
  • Time-domain channel estimating method under symbol timing error
  • Time-domain channel estimating method under symbol timing error

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[0023] Existing time-domain channel estimation is accomplished by inserting repeated training sequences in the time domain. The invention researches and develops an improved method for time-domain channel estimation using periodic sequences under symbol timing errors. After the system completes fine synchronous timing, there will still be a timing error of ±m symbols, where ±m means that the timing is shifted forward or backward by m symbols. The backward timing offset will have a great impact on the channel estimation in the time domain, and the path of the channel will be rotated, resulting in severe intersymbol interference (InterSystem Interface, ISI). The forward timing offset usually only brings some noise effects, making it impossible to distinguish the noise components from the channel trails. This noise is generated by the autocorrelation of the periodic sequence. Therefore, when performing fine synchronization timing, the symbol timing is often controlled to be shif...

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Abstract

The invention discloses a time-realm channel estimating method under symbolic timing error, which is characterized by the following: replacing front corresponding number symbol of first channel extraction window through several front symbol of second channel extraction window; simplifying the estimating method of time-realm channel; improving property of channel estimation under symbol timing error.

Description

technical field [0001] The present invention relates to the communication field, in particular to a time-domain channel estimation method under symbol timing errors. The present invention can be applied to single-carrier systems using cyclic prefixes, and can also be extended to OFDM systems and Other cyclic prefix code division multiple access systems. Background technique [0002] The realization of channel estimation relies on the training sequence inserted in the data symbols. The frame structure of the transmitted data includes transmitted effective data, pilot training sequence, guard sideband and cyclic prefix. In view of the fact that the Unique Word (UW) sequence has perfect autocorrelation characteristics, the pilot training sequence is generally composed of several UW sequences with a certain length, and the length of the sequence is set to P, for example, 4 UW sequences with a length of 16 Send training pilots with a length of 64. Channel estimation adopts the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
Inventor 唐琳周平周斌张小东卜智勇王海峰
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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