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Stochastic access detection method and communication apparatus
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A technology of random access and detection method, applied in the field of communication, can solve the problems of resource consumption and large storage space, and achieve the effect of saving storage space and balancing efficiency
Active Publication Date: 2009-08-12
HUAWEI TECH CO LTD
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Problems solved by technology
In the process of realizing the present invention, the inventors have found that at least the following problems exist in the prior art: when using the direct method to perform DFT transformation on the root ZC sequence, the results of the DFT transformation of all the root ZC sequences are pre-stored, which consumes a large storage space and is not necessary. It is suitable for use in engineering; when using the look-up table method to perform DFT transformation on the root ZC sequence, phase index accumulation is required. When doing phase index accumulation, modulo calculation is used. Programmable gate array) needs to be realized by division operation, which is not very good for FPGA and requires a lot of resources
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Embodiment 1
[0042] The principles of the embodiments of the present invention will be described below.
[0043] The value in the root ZC sequence used in random access detection is shown in formula (1):
[0044] x u ( n ) = e - j πun ( n + 1 ) N ZC , 0 ≤ n ≤ N ZC - 1 - - - ( 1 )
[0045] Among them, u is the identification number of the sequence; N ZC is the length of the sequence.
[0046] In order to sa...
Embodiment 2
[0074] figure 2 The whole random access detection process in this embodiment is shown.
[0075] For the data received by each antenna RACH, the following steps are performed:
[0076] Step 1, spectrum shifting the data received by the antenna from the RACH;
[0077] The specific spectrum moving method is as follows: the data received by the antenna from the RACH and the d ( n ) = e - 2 πj f 0 n multiplied, where f 0 It is the frequency offset of the RACH center frequency relative to the 0 IF.
[0078] Step 2, performing DDC (Digital Down Conversion, digital down-conversion) conversion on the data after the spectrum shift;
[0087] The discrete Fourier sequence acquisition module in this embodiment, such as image 3 shown, including:
[0088] The first processing unit 301 is configured to obtain the corresponding multiplication factor W of the root ZC sequence whose sequence number is u u，1 , the initial value Y of the intermediate result u (0) and the zeroth discrete Fourier transform DFT result X u (0), the x u (0) is the accumulation result of all values in the root ZC sequence, and the W u，1 According to the formula obtained, the y u (0) According to the formula obtained, where the N ZC is the length of the root ZC sequence, and v satisfies (uv-1) mod N ZC = the smallest integer of 0;
[0089] The second processing unit 302 is configured to u，1 , Y u (0) and X u (0) Sequentially calculate the first to Nth corresponding to the root ZC sequence ZC -1 DFT result, combined with X u (0) Obtain the DFT sequence corresponding to the root ZC sequence.
[0090] The module may also in...
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Abstract
The invention discloses a random access detection method and a communication device. The method comprises the steps of: acquiring a corresponding multiplicative factor Wu, 1, an initial value Yu(0) of an intermediate result and a 0th discrete Fourier transform (DFT) result Xu(0) of a root ZC sequence taking u as a sequence number, wherein the Xu(0) is an accumulation result of the entire value in the root ZC sequence, the Wu, 1 is acquired according to a formula (1), the Yu(0) is acquired according to a formula (2), NZC is the length of the root ZC sequence, and v is a minimum integer which satisfies that (uv-1)mod NZC is equal to 0; and orderly calculating first to NZC-1th DFT results corresponding to the root ZC sequence according to the Wu, 1, the Yu(0) and the Xu(0), combining the Xu(0) to obtain a DFT sequence corresponding to the root ZC sequence, and utilizing the DFT sequence for random access detection. The technical proposal can balance the efficiency, operation cost and storage space of random access detection.
Description
technical field [0001] The present invention relates to the technical field of communication, in particular to a random access detection method and a communication device. Background technique [0002] In the LTE (Long Term Evolution, Long Term Evolution) system, the random access technology is an important technology for user equipment (User Equipment) access control in the communication system. The UE completes the uplink timing synchronization correction through the random access process, and the user power Adjustment and application of user resource requirements. [0003] In the LTE system, RACH (Random Access Channel, random access channel) uses the cyclic shift of Zadoff-Chu (abbreviated as ZC) sequence as the preamble, and these cyclic shift sequences can be called Zero Correlation Zone (Zero Correlation Zone) Abbreviated as ZCZ). For example, when a mobile phone has a service requirement, it first submits a resource scheduling request to the base station, that is, ...
Claims
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