Uplink orthogonal reference signal distribution method for universal land wireless access system

Abstract

The invention relates to an uplink orthogonal reference signal allocation method used for universal land wireless access system, which comprises the following steps: the number of the groups of the user terminals to be grouped in the base station scope of the universal land wireless access system is first set and the cyclic shift interval base is set according to the uplink channel length of the universal land wireless access system; then the cyclic shift intervals of various groups are determined according to the number of the groups, the delay extension values of the uplink channel of various user terminals the base station obtains beforehand in the scope and the cyclic shift interval base; then the maximum number of the user terminals contained in various groups is calculated accordingto the signal length of the initial constant module zero autocorrelation sequence of the universal land wireless access system; finally the cyclic shift is applied to the initial constant module zeroautocorrelation sequence for the corresponding times according to the cyclic shift intervals of various groups and the maximum number of the user terminals contained in various groups so as to ensurethat the corresponding user terminals contained in various groups respectively acquire the uplink orthogonal reference signal. The invention can ensure that the communication system supports more orthogonal pilot channels.

Description

technical field [0001] The present invention relates to an uplink orthogonal reference signal allocation method, in particular to an uplink orthogonal reference signal allocation method for a general terrestrial wireless access system. Background technique [0002] Currently, in the Evolved Universal Terrestrial Radio Access system (E-UTRA), the base station (Node B) determines the scheduling method based on channel information and the time division duplex (TDD) system by analyzing the received uplink reference signal In the downlink transmission diversity (beamforming) method, since the E-UTRA standardization working group has adopted the single-carrier frequency division multiplexing system (SC-FDMA) with a cyclic prefix as the modulation method for uplink transmission, and in SC-FDMA, uplink transmission A subframe is composed of several Orthogonal Frequency Division Multiplexing (OFDM) symbols that have been spread by discrete Fourier transform (DFT). Therefore, the E-UT...

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Problems solved by technology

Therefore, the number of users who simultaneously transmit broadband reference signals in the two short symbol positions of the uplink subframe is extremely limited. To use channel information-based scheduling in uplink transmission to improve system throughput, a base station (Node B) is required There will be a lot of scheduled users, and various existing technical methods are difficult to meet the needs of users

[0010] In summary, since the multiplexed users need to simultaneously transmit broadband uplink pilot signals in the same short symbol block, the existing code division multiplexing method is limited by the length of the CAZAC sequence and the length of the cyclic time shift. The maximum number of users that can be supported is very limited. At the same time, in order to avoid interference in the cell, the length of the cyclic time shift must be greater than the maximum delay spread of all users in the cell, which further leads to the fact that the existing code division multiplexing method can support The maximum number of user terminals is reduced, which cannot meet the needs of uplink scheduling based on channel information. How to solve the shortcomings of the existing technology has become an urgent technical issue in the industry.

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