Method for constructing and distributing training sequence with zero interference window and channel estimator thereof

A technology of channel estimator and training sequence, applied in baseband system components, electrical components, transmission systems, etc., can solve the problems of complex channel estimation, no consideration, and no consideration of how to simplify channel estimation, etc., to achieve simple channel estimation, Effect of Efficient Channel Estimation

Active Publication Date: 2009-10-21
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0011] The traditional training sequence design method does not consider how to simplify the channel estimation, thus making the channel estimation complicated. In addition, the traditional training sequence design does not consider how to use a simple channel estimator to obtain the theoretical limit of the signal energy
For example, in the above-mentioned TD-SCDMA standard, the training sequence needs to realize channel estimation through FFT, which increases the complexity of the receiver

Method used

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  • Method for constructing and distributing training sequence with zero interference window and channel estimator thereof
  • Method for constructing and distributing training sequence with zero interference window and channel estimator thereof
  • Method for constructing and distributing training sequence with zero interference window and channel estimator thereof

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Embodiment Construction

[0039] The following embodiments of the present invention will illustrate how to construct a binary spread spectrum sequence with zero interference window characteristics and use it as a training sequence. The autocorrelation and cross correlation of this training sequence are within a certain delay offset Both are 0.

[0040] First, the definition of the zero-interference window is explained. We define N spreading sequences [C 0 , C 1 ...C N ], where C n =[c n，0 , c n，1 ... c n，N-1 ] of length N, we say that we obtain zero-interference windows of length Z if these spreading sequences satisfy the following conditions:

[0041] ρ jk ( τ ) = Σ l = 0 N - 1 c j , l ...

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Abstract

The invention provides a method for constructing a training sequence with zero interference window characteristics, which comprises the following steps: firstly, constructing gray sequence pairs (X(m),Y(m)) with length being Lm equal to 2<m>, wherein m is a positive integer more than 1; secondly, constructing a zero-order mother matrix F<(0)> by using the gray sequence pairs, (formula is shown as the lower right picture), wherein *m is a bit reversal sequence of the Y(m), -Xm is an antitone sequence of the X(m); thirdly, obtaining an n-order mother matrix F<(n)> by using a recursion formula: (formula is shown as the lower right picture), wherein n is positive integer, * expresses matrix intersection operation using a line as the unit, the intersection width is 2<m+n-1>; wherein the n-order mother matrix F<(n)> forms a group of spread spectrum sequences with zero-interference window characteristics, each line in the matrix is used as a spread frequency sequence; each spread frequency sequence forms each training sequence by adding a prefix with the length being Z, and the prefix consists of last Z elements of each spread frequency sequence (formula is shown as the lower picture).

Description

technical field [0001] The present invention relates to training sequence design in the communication field, in particular to a training sequence construction and allocation method with zero interference window characteristics, and a channel estimator for the training sequence. Background technique [0002] In a wireless communication system, due to the reflection and refraction characteristics of electromagnetic waves and the complexity of the communication environment, the propagation path between the transmitter and the receiver is very complicated, resulting in the signal received by the receiving end usually coming from multiple propagation paths The superposition of signals, and the amplitude and phase of each path signal vary with time and space. This phenomenon is called multipath fading of wireless channels, and multipath fading is the main feature of mobile channels. The existence of multipath leads to inter-symbol interference (Inter-Symbol Interference, ISI). In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L25/02H04L27/26H04B1/7115
Inventor 魏华
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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