Method and system for sending sequence of pilot freqency in system of multiple antenna and carriers

Abstract

The invention discloses a pilot sequence transmission method of a multi-antenna multi-carrier system, comprising: determining the number M of pilot carriers and grouping the pilot carriers, M not less than the product of the total number of transmitting antennas multiplied by the number of channel multipaths , and M is an even multiple of the total number of transmit antennas, the number of pilot carriers in each group is twice the total number of transmit antennas, and the pilot carriers in each group are distributed at equal intervals; all transmit antennas are in the same transmission symbol The pilot sequences are transmitted on the and pilot carriers, wherein the pilot sequences of different transmit antennas are equally power distributed and phase-orthogonal to each other. The invention also discloses a pilot sequence sending device, a transmitter and a receiver. After the invention is applied, the influence of the guard frequency band on the orthogonality of the pilot sequence is reduced. In addition, in practical applications, a reasonable pilot overhead can be properly selected according to the requirements of system design, so that the performance of the system is close to the performance lower bound of ideal channel estimation.

Description

technical field [0001] The present invention relates to the technical field of multi-antenna and multi-carrier, and more specifically, the present invention relates to a pilot sequence sending method and system in a multi-antenna and multi-carrier system. Background technique [0002] The future development trend of mobile communication services is high-quality multimedia services, and the throughput requirements of the cell will be increased to 100Mbps ~ 1Gbps. The industry expects that such a high-speed service can be realized between 2012 and 2015, but the contradiction with the rapid growth of the service rate is that spectrum resources are limited. In order to realize high-speed information transmission on limited spectrum resources, a feasible way is to develop new air interface technologies with higher spectrum utilization. Multiple-input multiple-output (MIMO) technology (multi-antenna technology) can greatly improve the spectral efficiency, thereby improving the ca...

AI Technical Summary

Problems solved by technology

When it is applied in real systems with guard bands, such as in environments with low SNR or high vehicle speeds, the accuracy of channel estimation cannot be guaranteed

[0007] The non-uniformly distributed pilot symbol sequence will increase the lower bound of the minimum pilot overhead, and it takes a lot of calculations to solve the pilot power distribution through the gradient iterative algorithm. At the same time, how to search for the optimal pilot carrier still needs further research

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