A Timing Synchronization Method for Receivers in OFDM Wireless Communication System

A wireless communication system and timing synchronization technology, applied in the field of communication, can solve the problems affecting the processing speed of the receiver of the wireless communication system and occupying hardware resources, etc.

Inactive Publication Date: 2011-12-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these high-speed processing platforms often have strict requirements on the complexity of the algorithm. Overly complex calculations will not only affect the processing speed of the wireless communication system receiver, but also occupy a large amount of hardware resources.

Method used

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  • A Timing Synchronization Method for Receivers in OFDM Wireless Communication System
  • A Timing Synchronization Method for Receivers in OFDM Wireless Communication System
  • A Timing Synchronization Method for Receivers in OFDM Wireless Communication System

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Embodiment

[0036] figure 1 It is a functional block diagram of an OFDM-based wireless communication system

[0037] Such as figure 1 As shown, in the wireless communication system based on OFDM, at the sending end, the data to be sent transmitted by the MAC layer has undergone channel coding, interleaving, mapping, OFDM baseband modulation, synchronization sequence addition, cyclic prefix addition and other modules, and finally forms an effective Wireless frames, that is, data frames are sent to the wireless channel. At the receiving end, the receiver receives the data transmitted through the wireless channel in real time, and accurately locates the effective data frames transmitted by the transmitter through the synchronization module. After the detected effective data frames are demodulated by OFDM, the channel estimation Compensation, demapping, deinterleaving, channel decoding and other modules, and finally restore the original data information.

[0038] figure 2 It is a schemat...

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Abstract

The invention, aiming at an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, provides a timing synchronization algorithm which can be easily and simply implemented in a receiver. A 62-point frequency domain ZC (Zadoff-Chu)sequence is generated by a generation formula of a frequency domain ZC sequence, two ends of the generated sequence are added with 33 zeros, then, three zeros are inserted between neighboring points so as to expand the sequence to have 512 points, and synchronization sequence obtained by performing IFFT (Inverse Fast Fourier Transform) is usedas a synchronizing signal of the OFDM wireless communication system; the receiver firstly quantifies the received synchronization sequence, then, performs conjugated correlation with a local synchronization sequence, and simultaneously, calculates a cross correlation coefficient amplitude based on sum of absolute values of a real part and an imaginary part. In this way, the correlation operation and the cross correlation coefficient amplitude calculation only contain addition and subtraction, use of a multiplying unit is avoided, operation complexity is greatly reduced, processing efficiency is improved and resource is saved, so that the timing synchronization of the receiver can be implemented easily and simply, and can be implemented more effectively on receiver hardware.

Description

technical field [0001] The invention belongs to the technical field of communication, and more specifically relates to a simple and easy-to-implement receiver timing synchronization method in an OFDM-based wireless communication system. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) can be said to be a modulation technology, and it can also be regarded as a multiplexing technology. the concept of. [0003] OFDM technology is a special multi-carrier transmission scheme, which can well resist frequency selective fading and narrowband interference. Due to the complexity of the wireless channel, the channel conditions are relatively complicated, and the frequency response of the channel is basically non-flat. In view of this feature, the main technical feature of OFDM technology is to divide the entire signal frequency band into N orthogonal frequency sub-channels. The transmission rate of the signal carried in each sub-channel and the frequenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 隆克平刘健金无眠
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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