Method for receiving and detecting special burst

Abstract

The invention relates to the field of mobile communication, and especially relate to a method for receiving and detecting special burst. The method comprises the following steps: calculating an amplitude mean value of symbols of a physical channel to be detected; reconstructing a star sign position of a special burst standard symbol according to a special burst data patterns obtained in advance and the amplitude mean value; calculating a normalized distance metric of the symbols to be detected and the star sign position of the standard symbol; comparing the normalized distance metric and a preset threshold, if the normalized distance metric is smaller than the preset threshold, the physical channel to be detected is special burst, otherwise, the physical channel to be detected is not special burst. The method makes full use of complete information of the symbols of the physical channel to be detected, significantly enhances robustness of special burst detection, and realizes a purpose of balancing higher correct detection rate with lower false alarm rate.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a special burst reception detection method. Background technique [0002] When communicating in the third generation mobile communication system represented by Wideband Code Division Multiple Access (WCDMA) system and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), there is not always data to be sent, when the link is established When there is no transmission block provided by the upper layer for transmission on the physical layer transport format composite channel (CCTrCH), the system needs to send a special burst (SB, SpecialBurst) according to the set scheduling period according to the configuration parameters of the upper layer to ensure that the air interface user Synchronization control between a device (UE, User Equipment) and a base station. [0003] According to the relevant provisions of 3GPP TS 25.224, for the Secondary Common Control Channel (S...

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Problems solved by technology

[0012] First of all, the scene where the TFCI decoding result is non-zero is fixed as a non-special burst, so in the small signal scene (for example, at the edge of the cell), it is very easy to miss the detection of the special burst caused by the wrong bit of the TFCI, resulting in the failure of the communication link. The loss of synchronization seriously affects the user experience; secondly, the correctness judgment of the SB sequence is based on the comparison between the hard decision bit error rate and the preset threshold. Since the hard decision processing only uses the positive and negative information of the I / Q path of the data to be detected, The simple preset threshold setting cannot ensure a high detection success rate (that is, the probability that the detection object is a special burst and is detected correctly) and a low false alarm rate (that is, the detection object is not a special burst but is misjudged as a special burst. probability)

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