Novel OFDM parameterized channel estimator

A channel estimator and parameter estimation technology, applied in the field of channel estimators, can solve problems such as high computational complexity and poor performance

Inactive Publication Date: 2008-11-19
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the performance of this scheme is poor under low signal-to-noise ratio. On the other hand, this scheme needs to perf

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  • Novel OFDM parameterized channel estimator
  • Novel OFDM parameterized channel estimator
  • Novel OFDM parameterized channel estimator

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Embodiment Construction

[0030] The present invention will be described in detail below through the accompanying drawings and examples.

[0031] figure 1 It is the basic principle block diagram of OFDM system. It is assumed that an OFDM frame has N symbols and K subcarriers. At the transmitting end, the data bits are first mapped into signals in the signal constellation, and multiple parallel baseband signals are formed after serial-to-parallel conversion, and then undergo K-point inverse fast Fourier transformation (IFFT) to add a cyclic prefix (CP) of length G ) and then transmitted from the antenna; after the wireless fading channel, the CP is removed at the receiving end and fast Fourier (FFT) transform is performed, and finally the system detector uses the channel state information generated by the channel estimator to recover the original data from the baseband signal. In an actual system, the data bits can be coded and interleaved before being mapped, and correspondingly deinterleaved and dec...

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Abstract

The invention provides a parametric channel estimator for the orthogonal frequency division multiplexing (OFDM) communication system; the parametric channel estimator is characterized in that the receiver end firstly adopts a novel parameter estimator to estimate two types of channel parameters, including the path number and the time delay corresponding to each path; the whole channel coefficient is accurately estimated according to the estimated channel parameters; compared with the parametric channel estimator in the prior art, the parametric channel estimator provided by the invention not only can accurately estimate the channel under low signal-to-noise ratio, but also can reduce the computation complexity of the estimator effectively.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a channel estimator applied to an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] The mobile wireless communication system must overcome the inter-symbol interference caused by multipath delay extension. Equalization is a method to overcome inter-symbol interference, but with the continuous improvement of transmission rate, the equalization algorithm on multiple symbols is very complicated. OFDM is a transmission method that can effectively solve the problem of intersymbol interference. In practical applications, there are usually non-coherent OFDM systems and coherent OFDM systems. The non-coherent OFDM system does not require channel estimation, but compared with the coherent OFDM system, the system performance will be lost by about 3dB, and the information symbols must have a constant mode characteristic. Therefore, a cohe...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26H04B1/707H04L25/02
Inventor 刘元安刘思杨谢刚王飞飞唐碧华高锦春黎淑兰胡鹤飞刘凯明李莉袁东明张然然孙剑锋
Owner BEIJING UNIV OF POSTS & TELECOMM
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