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Integer frequency doubling offset and channel parameter joint estimation algorithm with ultra-low complexity in single carrier frequency domain equalization (SC-FDE) system

A technology of integer multiple frequency offset and joint estimation, which is applied to the shaping network and baseband system components in the transmitter/receiver, and can solve the problems of high computational complexity and reduced algorithmic complexity

Inactive Publication Date: 2013-05-08
XIDIAN UNIV
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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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  • Integer frequency doubling offset and channel parameter joint estimation algorithm with ultra-low complexity in single carrier frequency domain equalization (SC-FDE) system
  • Integer frequency doubling offset and channel parameter joint estimation algorithm with ultra-low complexity in single carrier frequency domain equalization (SC-FDE) system
  • Integer frequency doubling offset and channel parameter joint estimation algorithm with ultra-low complexity in single carrier frequency domain equalization (SC-FDE) system

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Embodiment Construction

[0055] The present invention will be described in detail below in conjunction with specific embodiments.

[0056] The invention proposes a joint estimation algorithm of integral multiple frequency offset and channel parameter based on zero slice of Chu sequence mutual ambiguity function in SC-FDE system, and the algorithm has ultra-low complexity. The steps to realize it are as follows:

[0057] Step 1: Generate training sequences

[0058] 1a) The communication system utilizes the Chu sequence to construct the training sequence of the SC-FDE frame. The Chu sequence has strong time-domain autocorrelation and its time-domain sequence and corresponding frequency-domain sequence are constant amplitudes. The Chu sequence among the present invention Generated by the signal generator in the communication system according to the following formula:

[0059] X ( k ) = e jπμ ...

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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 the time-frequency frequency of an ultra-high-speed wireless mobile communication system In the synchronization module, the integer multiple frequency offset estimation in the synchronization system is realized. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system has the advantages of strong resistance to multipath fading, high spectrum utilization, and high data transmission rate, and has been widely used in military and civilian communication systems. The main disadvantage is that the peak-to-average ratio 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 ha...

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 李丹萍张海林李勇朝刘毅任智源贾晓婷
Owner XIDIAN UNIV
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