Low peak-to-average ratio multi-antenna pilot optimization and low-complexity transmission method

Abstract

The invention discloses a low peak-to-average ratio multi-antenna pilot optimization and low-complexity transmission method, which comprises the following steps of: firstly, searching for an optimal constant modulus zero auto-correlation sequence according to a pilot length, the size of discrete Fourier transform and a sub-carrier mapping format; secondly, performing the discrete Fourier transform, sub-carrier mapping, inverse discrete Fourier transform and cyclic prefix addition on the sequence, and storing the processed sequence into a read-only memory of a field programmable array; thirdly, multiplying signals of different transmission antennae by using different phases according to the sub-carrier mapping format; and finally, judging whether a current signal block transmits a pilot signal or not according to the number of a current radio access unit and the number of a signal block in a timeslot. By the method, the requirements of a multiple-input and multiple-output wireless channel measurement system on the low peak-to-average ratio of the transmitted signals and low implementation complexity are met.

Description

technical field [0001] The invention belongs to the technical field of broadband wireless communication, and in particular relates to a low peak-to-average ratio orthogonal frequency division multiplexing pilot construction method, which is suitable for a multi-input multi-output channel measurement system. Background technique [0002] In recent years, information theory research and experiments have shown that in a wireless environment rich in multipath, compared with the traditional Single-Input and Single-Output (SISO) system, Multiple-Input and Multiple-Output (Multiple-Input and Multiple-Output) -Output, MIMO) system can obtain higher system capacity and better link reliability. However, the actual capacity gain of a MIMO system is closely related to the actual characteristics of wave propagation. In a transmission scenario rich in multipath, a MIMO channel can be produced into many independent sub-channels according to the number of antennas, however, a fully correla...

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Problems solved by technology

For example, for a signal with a bandwidth exceeding 100MHz, after 4-fold frequency interpolation is usually used, the calculation amount of the sending and receiving pulse shaping filter is very large, and the correlation of the pseudo-random sequence is closely related to the length, and the long sequence makes the calculation of the receiving correlation greatly increased complexity

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