Synchronization sequence construction method for multi-input multi-output orthogonal frequency division multiplexing (OFDM) system

Abstract

The invention relates to a synchronization sequence construction method for a multi-input multi-output orthogonal frequency division multiplexing (OFDM) system. The method comprises the following steps of: constructing a chu sequence s with the length of P, wherein P is less than N, (N)P is equal to 0, (g)P is a mold P operator, (N)P represents mold P operation related to N, and N is the length of a synchronization sequence; and circularly shifting the chu sequence s to obtain a shift sequence s (mu M), wherein g(g) is a circular shift operator, s (mu M) represents a vector obtained by circularly shifting the chu sequence s downwards by mu M bits, M is a shift parameter, mu represents an index of a transmitting antenna and is an integral operator representing rounding of P / NI, a design parameter NI is more than or equal to Nt and less than P, and Nt represents the number of transmitting antennas. The synchronization sequence construction method is easy to generate and has a low system load.

Description

technical field [0001] The invention relates to a method for constructing a synchronous sequence applicable to a multiple-input multiple-output orthogonal frequency division multiplexing system, belonging to the technical field of synchronization in mobile communication. Background technique [0002] Orthogonal frequency-division multiplexing (OFDM, orthogonal frequency-division multiplexing) is very suitable for wireless communication channel transmission due to its advantages of high spectral efficiency, anti-frequency selective fading and narrow-band interference, and is also used in the current new generation of mobile communication systems. mainstream technology. The combination of multiple-input multiple-output technology and OFDM technology can provide greater spectral efficiency and higher data rates; in the current situation where spectrum resources are increasingly tight and data rates are increasingly demanding, multiple-input multiple-output OFDM technology has ...

AI Technical Summary

Problems solved by technology

However, due to the time-varying nature of the wireless channel, there will be a frequency offset of the wireless signal during transmission, such as a Doppler shift, or a frequency offset between the carrier frequency of the transmitter and the local oscillator of the receiver

The carrier frequency offset that only accounts for a small part of the subcarrier spacing will destroy the orthogonality between the subcarriers of the OFDM system, and then generate inter-subcarrier interference, resulting in a significant decline in the performance of the OFDM receiver.

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