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Detection of time-frequency frequency-hopping pattern

A pilot pattern and detector technology, which is applied in the field of detecting time-frequency hopping patterns to achieve the effect of simplified calculation

Inactive Publication Date: 2009-08-19
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] The invention solves the problem of detecting the time-frequency frequency hopping pattern of the pilot signal satisfying a certain criterion in the optimal sense

Method used

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  • Detection of time-frequency frequency-hopping pattern
  • Detection of time-frequency frequency-hopping pattern
  • Detection of time-frequency frequency-hopping pattern

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Embodiment Construction

[0039] The goal of the present invention is to detect the presence of a pilot signal, and subsequently by estimating the unknown parameter (τ 0 , ν 0 ) to perform a rough initial time-frequency synchronization.

[0040] Assuming the initial synchronization has been completed, so (τ 0 , ν 0 ) is known, for a properly designed pilot signal as those described above, defined in (τ 0 ≤τ≤τ 0 +τ max , ν 0 ≤ν≤ν 0 +ν max ) channels in the range of The maximum likelihood (ML) estimation of , which is related to the two-dimensional time-delay Doppler image I(τ, ν) by the following formula:

[0041] I ( τ , v ) = Δ ∫ r ( t ) s p * ( t - τ ) e ...

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Abstract

The present invention relates to a method for detecting a pilot pattern, comprising a pilot signal sp(t), in a received signal r(t) implemented in an Orthogonal Frequency Division Multiplexing (OFDM) system. The method comprises the steps: computing a value of a log-likelihood function ramda(tau0, v0) for a hypotheses space specified by the pilot signal sp(t) and an initial time frequency offset (tau0, v0), and relating the computed value to a reference value to detect the pilot pattern.

Description

technical field [0001] The present invention relates to a method for detecting time-frequency hopping patterns in OFDM (Orthogonal Frequency Division Multiplexing) systems. Background technique [0002] Typically, a wireless communication channel in a single-carrier transmission system is modeled with a time-varying impulse response g(τ,t), which may be frequency-selective for any given time t due to multiple channels. Frequency selectivity of a channel can be estimated by observing known pilot signals transmitted at times of interest, whereas time selectivity is usually tracked by observing multiples of these periodically inserted known signals. [0003] However, in the terrestrial mobile communication environment, channel selectivity is mainly caused by the movement of terminals. As long as the speed of movement remains constant, the channel can be modeled by a time-invariant delay-Doppler response h(τ, v), expressed as the delay τ and Doppler shift caused by the incoming...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L5/0007H04L27/2657H04L5/0048
Inventor 桂建卿
Owner TELEFON AB LM ERICSSON (PUBL)
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