An Ultra-Low Complexity Algorithm for Joint Estimation of Integer Multiple Frequency Offset and Channel Parameters in SC-FDE System

Abstract

The invention discloses an integer frequency doubling offset and channel parameter joint estimation algorithm with an ultra-low complexity in a single carrier frequency domain equalization (SC-FDE) system. The algorithm comprises the following steps: (1) generating a training sequence; (2) obtaining a frequency domain signal of a receiving end; (3) constructing a mutual fuzzy function Doppler zero section of a Chu sequence; (4) constructing a metric function: utilizing the zero section of the Chu sequence to conduct joint estimation for an integer frequency doubling offset and channel parameter, and constructing the metric function; (5) obtaining integer frequency doubling offset estimation from the metric function; (6) obtaining corresponding time domain channel swashing response estimation according to the integer frequency doubling offset estimation. Characters of a mutual fuzzy function of the Chu sequence are utilized by the algorithm, the algorithm just needs using the zero section to construct an estimation metric function, and the algorithm not only can conduct estimation for integer frequency doubling offset, but also simultaneously can conduct channel estimation. Compared with a traditional algorithm, the algorithm which does not need multi-group cross-correlation operation has the ultra-low complexity.

Description

technical field [0001] The present invention accurately estimates the integer frequency offset existing in a single carrier frequency domain equalization (SC-FDE) system, belongs to the field of communication technology, and further relates to a time-frequency synchronization module of an ultra-high-speed wireless mobile communication system, Realize the integer times frequency offset estimation in synchronous system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system has the advantages of strong anti-multipath fading ability, high spectrum utilization rate, and high data transmission rate. It has been widely used in military and civilian communication systems, but a major shortcoming of OFDM system is That is, the peak average is relatively large. The SC-FDE system has similar advantages to the OFDM system. Since there are no multiple subcarriers, its peak-to-average ratio has been greatly impr...

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Problems solved by technology

[0018] Compared with the traditional method of using FFT to calculate the mutual fuzzy function, the complexity of the algorithm has been greatly reduced, but both methods traverse the mutual fuzzy function in the entire time delay and frequency offset range, and search for the The value of the parameter delay and Doppler frequency shift when the two-dimensional metric matrix reaches the maximum, so the computational complexity is still very high

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