Random access signal transmission method and system for mobile terminal

Abstract

The invention discloses a random access signal transmission method for a mobile terminal. The method comprises the following steps of: 1, selecting a time domain raw signature sequence; 2, performing frequency band zerofilling on the time domain raw signature sequence to obtain a time domain basic signature sequence of which a point number is the same as the subcarrier number N of a shared channel; 3, performing sequence repetition on the time domain basic signature sequence, and then performing cyclic prefix insertion to obtain a time domain repeated signature sequence; 4, performing sequence extension on the time domain repeated signature sequence to obtain a time domain extended signature sequence; and 5, performing frequency shifting on the time domain extended signature sequence to obtain a time domain transmitted signature sequence. The invention also discloses a random access signal transmission system for the mobile terminal. By the technology provided by the invention, the problems of long operation time, long idle time, high realization complexity and the like caused by great-point number Fourier transform process in a transmitted signature sequence acquisition process are solved.

Description

technical field [0001] The invention relates to a method and system for transmitting a random access signal by a mobile terminal, belonging to the technical field of mobile communication. Background technique [0002] In the field of mobile communication technology, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system is gradually being popularized and applied due to its simple structure and good transmission effect. The OFDM system has high spectrum utilization efficiency, strong anti-multipath fading ability, is conducive to the realization of wireless multimedia transmission, and can concentrate the transmission power, expand the coverage, and make the power amplifier simple and cheap. Therefore, it has great advantages in the fourth generation mobile communication Good development prospects. [0003] LTE (long term evolution, long-term evolution) is the evolution of the 3G communication system, which develops and enhances ...

AI Technical Summary

Problems solved by technology

For the PRACH channel of the LTE system, the method and device also need to perform IFFT transformation with a large number of points, which consumes a lot of physical resources and time resources

[0013] In the prior art, the process of processing the Zadoff-Chu sequence and mapping it to the PRACH transmission needs to go through the IDFT with a large number of points, and the IDFT with a large number of points takes up a lot of processing resources and time, and the idle time is long, so it cannot Pipeline operation consumes more resources

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