Short training field design method used for wireless local area network communication system

Abstract

The invention discloses a short training sequence design method used for a wireless local area network communication system. First, related parameters of a field to be designed are determined. Then multiple times of iteration are performed. In one time of iteration, fields, which are the sums of a plurality of elements obeying a Bernoulli distribution of predetermined probability density parameters, of determined lengths and configuration, are generated according to the parameters, and the generated fields are screened according to SELF of the fields and parameters for next iteration are updated. Finally, after the iteration is ended, the fields with good self-relevance and periodically repeated time domains are set as the designed short training fields. According to the invention, short training fields of any lengths can be designed. The fields only contains elements of (1+i), -(1+i) and 0 and has good self-relevance and periodically repeated time domains and wave shapes. According to the invention, on the condition that specific values are assigned to specific positions of the fields, the fields with good wave shapes can also be obtained, so that application scene and application range are increased further. The invention can be applied but is no limited to the design of short training fields for OFDM systems.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a short training sequence (Short Training Field, STF) design method of a wireless local area network communication system. Background technique [0002] The physical layer transmission mode of a typical wireless LAN communication system is as follows: short training sequence (STF) is used for frame detection, automatic gain control (AutoGainControl, AGC), coarse frequency synchronization, coarse time synchronization, etc. of the wireless LAN communication system; Followed by a long training sequence (LongTrainingField, LTF) for channel estimation and more accurate frequency offset estimation and time synchronization; LTF is followed by a signaling field containing the rate and length information of the communication packet; followed by a data field. [0003] Compared with the single-carrier system, in the OFDM system, the sum of all sub-carriers after IFFT (Inverse...

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Problems solved by technology

And because the spectrum overlap between subcarriers of the OFDM system requires strict orthogonality between subcarriers, once there is a frequency deviation, the orthogonality will be destroyed, and intercarrier interference will appear.

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