Method for detecting random access of wireless communication system
A wireless communication system and random access technology, applied in wireless communication, sustainable communication technology, advanced technology, etc., can solve problems such as complex calculations and huge amount of calculations
Inactive Publication Date: 2013-09-11
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Random access usually needs to be matched with the signal transmission method. The random access schemes for OFDM and SC-FDMA transmission methods have been proposed in WiMAX and LTE systems. CDMA and frequency domain detection methods are used respectively. The CDMA detection method has a huge amount of computation. In the improved method of LTE random access detection, discrete Fourier transform (DFT) is used for frequency domain detection, and the operation is still complicated
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[0020] In the following, with reference to the accompanying drawings and specific implementation methods, a further description will be made on the frequency domain detection using prime number Zadoff-Chu sequence at the transmitting end to construct the random access preamble and the receiving end adopting zero-padding extension in the present invention.
[0021] The present invention proposes a random access preamble structure transmission and an efficient and low-complexity preamble detection method based on time-domain zero-padding fast Fourier transform FFT, which can be used for random access detection of a new type of communication and broadcast fusion transmission system and upgrade and improvement of an existing system. For the convenience of describing the present invention, in specific embodiments, it is assumed that the system uplink backhaul channel bandwidth is 2MHz, and the system uplink backhaul symbol rate is 1.536Msps, that is, the symbol interval or symbol dur...
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The invention discloses a method for detecting random access of a wireless communication system. In the method, firstly, the receiving end of a base station carries out zero-fill extension respectively on a precursor signal sequence received and transmitted by a random access detecting window and foreseen limited-numbered candidate random access preamble sequences so as to extend the two sequences into length which is power of 2; then, converting frequency domain and time domain by using quick Fourier algorithm, multiplying the frequency domain to obtain an extended power delay distribution sequence, and carrying out quick Fourier conversion on the extended power delay distribution sequence to obtain an inverse transformation sequence; and finally, simply processing the inverse transformation sequence to obtain an original time domain correlation value of the signal receiving sequence and the candidate signal sequence, thereby measuring and judging the random access sequence selected by a terminal and the distance of the terminal and base station according to the time domain correlation value. The measuring method disclosed by the invention can be used to greatly reduce the computational complexity, and improve the property of measuring the random access.
Description
technical field [0001] The invention belongs to the technical field of wireless communication system design, and in particular relates to a random access detection method used in a wireless communication system. Background technique [0002] Random access is a key technology in wireless communication systems. The terminal first needs to complete the uplink timing adjustment and network registration through the random access process before it can communicate. [0003] The primary task of random access is to adjust the uplink timing. Since there is a round-trip transmission delay between the terminal and the base station, and there is a time offset between the time when the signal frame is sent and received, the terminal cannot estimate when to send the signal frame so that the base station can receive the signal frame just at the beginning of the time slot. Since the terminals are distributed in different locations within the coverage of the base station, there will be diff...
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IPC IPC(8): H04W24/00H04W74/08
CPCY02D30/70
Inventor 曾学文刘马飞孙鹏倪宏
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI