Method and system for implementing single carrier frequency domain equilibrium

A technology of single-carrier frequency domain and implementation method, applied in multi-frequency code system, baseband system components, shaping network in transmitter/receiver, etc., can solve problems such as increasing system overhead, and achieve fast synchronization and channel estimation , high practicability, and excellent system performance

Inactive Publication Date: 2009-04-15
北京韦加航通科技有限责任公司
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Problems solved by technology

[0007] figure 2 The continuous transmission structure shown in the figure increases system overhead because two UWs are required between adjacent data blocks

Method used

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  • Method and system for implementing single carrier frequency domain equilibrium
  • Method and system for implementing single carrier frequency domain equilibrium
  • Method and system for implementing single carrier frequency domain equilibrium

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] image 3 It is a schematic structural diagram of the data frame adopted by the single-carrier frequency domain equalization system of the present invention. As shown in the figure, the frame signal includes two identical training blocks (Pilot Block, PB), and the two identical training blocks are used for channel estimation , followed by consecutive Q FFT blocks. A complete FFT block is composed of a data block and a UW block. The block length N of the FFT block is the FFT size, and the length of the UW segment is M.

[0031] The unique word sequence is generally a chu sequence or a frank-zadaff sequence specified in the IEEE802.16a standard, and its length is generally an integer power of 2.

[0032] The single-carrier frequency domain equalization realization system of the present invention includes a channel estimation mod...

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Abstract

The invention discloses a single carrier frequency domain equilibrium realizing method with low cost and a system thereof, comprising three parts of channel estimation, equalizer and channel tracking. A data frame adopted by the method / system comprises a training sequence part and a data transmission part. The training sequence part is arranged in the front part and comprises two same continuous training blocks. The data transmission part is arranged in the back part and comprises a plurality of continuous Fourier transforming blocks, namely FFT blocks. The length of every FFT block is the size of FFT. Any complete FFT block comprises a data block and a UW block. And the data block is in front, and the UW block is at back. The method / system utilizes the data of the two same training blocks for the channel estimation. Compared with a traditional continuous data format, the cost of useless data can be lowered. A noise prediction decision feedback equilibrium algorithm is adopted for the equilibrium treatment and a recursive least squares algorithm is adopted for the channel tracking treatment.

Description

technical field [0001] The invention belongs to the technical field of broadband wireless transmission, and in particular relates to a single-carrier frequency domain equalization method and system. Background technique [0002] Single carrier frequency domain equalization (single carrier frequency domain equalization, SC-FDE) is a very effective method for combating multipath interference in broadband wireless transmission. In a wireless communication system, in addition to being interfered by various noises, the multipath propagation of the transmitted signal also affects the bit error rate of data transmission, causing inter symbol interference (ISI). With the great improvement of access and data transmission rates, higher and higher transmission bandwidths cause serious time dispersion, and the received signal contains multipath waves that experience attenuation and time delay, causing frequency selective fading, which leads to Severe ISI. At this time, if only time-do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 吴昊田金洁方立
Owner 北京韦加航通科技有限责任公司
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