Method for accessing randomly front detection dynamic threshold

Abstract

The invention discloses a method for randomly accessing front check dynamic threshold value, comprising that descrambling input signal, descrambling frequency bias, and coherent non-coherent integration, obtaining the sign power time delay distribution of one front check mission at one access time space, finding the average noise horizontal evaluated value of the front check mission, using the evaluated value and the signal / noise ration set by superior, to interfere the integration length to dynamically real-time find the threshold value of single front check mission, finding the threshold values of all front check missions at the access time space, to select the maximum one as the threshold value of the front check. The invention via the noise level evaluation can dynamically real-time find front check threshold value, with simple, reasonable and effective threshold value setting, to avoid most false alarm, control the false alarm rate in allowed range, and confirm check efficiency.

Description

technical field [0001] The invention relates to a mobile communication method, in particular to a method for detecting the preamble of a WCDMA system random access channel. Background technique [0002] In the WCDMA system, in order to access the network for communication, the mobile station usually sends a period of preamble information first. After the base station receives the preamble information and confirms it, the mobile station will transmit a period of access information, which includes communication Important parameter information established. After the base station receives these messages, the communication link dedicated to the mobile station can be successfully established. Generally, this process is called a random access process. [0003] Random access is a very important part of the WCDMA system. It is the premise and basis for user equipment to register in a cell and establish a dedicated channel when calling after registration. Therefore, the performance ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for random access preamble detection dynamic threshold, to overcome the difficulty of threshold selection and false alarm in the fixed threshold method existing in the prior art Too many, the demodulation unit is blocked, and the existing dynamic threshold method has the disadvantages of long threshold adjustment period, in order to propose a dynamic, real-time, and convenient method for determining the preamble threshold, which can ensure the detection of valid signatures in the preamble , there are enough multipaths for access message demodulation, and it can prevent the false alarm rate from being too high and the random access dynamic threshold determination method to prevent the blocking phenomenon

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