Pilot frequency structure, pilot frequency transmitting method, and user channel estimation method
A technology of channel estimation and transmission method, which is applied in the fields of pilot transmission, pilot structure, and user channel estimation, and can solve problems such as increasing the number of interactions between the terminal and the base station, high collision probability, and inability to obtain channel estimation and uplink data of conflicting users. , to achieve the effect of reducing the probability of user random access pilot collision, reducing the probability of pilot collision, and improving interaction efficiency
Active Publication Date: 2017-05-17
SHANGHAI TAOLINK TECHNOLOGIES CORPORATION
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[0002] In a multi-user large-scale antenna array communication system, multiple users transmit pilot sequences and uplink data at the same time, and the uplink transmission time of each user is synchronized with each other. There may be multiple users transmitting pilot sequences in each uplink pilot time slot, but If the pilot sequences sent by each user are sine waves of different frequencies or symbols at different times or mutually orthogonal codes, then the pilot sequences of each user can be orthogonal, and the base station can correctly estimate the frequency of each user. channel to solve the uplink data of each user; but if multiple users choose the same pilot sequence, it is called pilot conflict, and the receiving end of the base station cannot obtain the channel estimation and uplink data of the conflicting users, which is solved in the prior art The method of pilot conflict is: the solution in LTE is to increase the number of interactions between the terminal and the base station, and finally the base station selects a certain user from the users where the pilot conflict occurs to continue to access
But for MTC scenarios: most of the devices are randomly accessed; the number of terminals is large, and the probability of collision is high; the bandwidth is narrow, and the interaction with the base station is time-consuming
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[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0039] Such as figure 1 As shown, a pilot structure includes L uplink pilot time slots and a frame of uplink data, each of the uplink pilot time slots is provided with K kinds of candidate orthogonal pilot sequences, and the L uplink The pilot time slots are uplink pilot time slot 1 to uplink pilot time slot L arranged in sequence respectively, and the uplink data is arranged after the uplink pilot time slot L, wherein L>1, K≥1. The K candidate orthogonal pilot sequences include one of sine waves of different frequencies, symbols of different times and mutually orthogonal codes.
[0040] Compared with the existing pilot structure, the pilot structure of the present invention has only one uplink pilot time slot, whi...
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The invention relates to a pilot frequency structure, a pilot frequency transmitting method, and a user channel estimation method. The pilot frequency structure comprises L uplink pilot frequency time slots and one uplink data frame, wherein each uplink pilot frequency time slot is provided with K types of candidate orthogonal pilot frequency sequences. The L uplink pilot frequency time slots are respectively arranged from number 1 to number L, and the uplink data is arranged behind the L uplink pilot frequency time slots, wherein L>1, and K>=1. Compared with a conventional pilot frequency structure which just has one uplink pilot frequency time slot, the pilot frequency structure has L uplink pilot frequency time slots, and can greatly reduce the probability of pilot frequency conflict caused by the random access of users in a cell.
Description
technical field [0001] The invention relates to the field of multi-user large-scale antenna array communication systems, in particular to a pilot structure, a pilot transmission method and a user channel estimation method. Background technique [0002] In a multi-user large-scale antenna array communication system, multiple users transmit pilot sequences and uplink data at the same time, and the uplink transmission time of each user is synchronized with each other. There may be multiple users transmitting pilot sequences in each uplink pilot time slot, but If the pilot sequences sent by each user are sine waves of different frequencies or symbols at different times or mutually orthogonal codes, then the pilot sequences of each user can be orthogonal, and the base station can correctly estimate the frequency of each user. channel to solve the uplink data of each user; but if multiple users choose the same pilot sequence, it is called pilot conflict, and the receiving end of t...
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Login to View More IPC IPC(8): H04L5/00H04L25/02
CPCH04L5/0037H04L5/0048H04L5/0078H04L25/0202
Inventor 屈代明江昊何辉汪志冰
Owner SHANGHAI TAOLINK TECHNOLOGIES CORPORATION