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A method and apparatus for transmitter timing adjustment

A technology of timing adjustment and timing adjustment value, which is applied in the direction of modulation carrier system, digital transmission system, electrical components, etc.

Inactive Publication Date: 2010-07-14
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] Another prior art way to apply TA advance or delay is to insert CP after upsampling, but in order to advance or delay the transmitted signal by a given TA amount of the BS, a shorter or longer CP is inserted

Method used

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  • A method and apparatus for transmitter timing adjustment
  • A method and apparatus for transmitter timing adjustment
  • A method and apparatus for transmitter timing adjustment

Examples

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Embodiment Construction

[0049] The terms timing adjustment or timing advance are used with reference to a timing adjustment value received, such as received at the MS from the BS. TA can be positive or negative, which indicates a timing delay or advance. In general, embodiments of the invention apply timing adjustments in two distinct parts: the fractional part is applied in the frequency domain as a signal rotation, and the integer part of TA is applied in the time domain as samples added to the rotated signal, or Samples to remove from the rotated signal. The rotated signal advanced / delayed by sample removal / addition is then transmitted after other conventional processing known in the art (up-conversion to RF, power amplification, etc.).

[0050] Before detailing more specific embodiments and variations of those embodiments, reference is first made to figure 1 ,in figure 1 Simplified block diagrams of various electronic devices suitable for implementing exemplary embodiments of the invention a...

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PUM

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Abstract

A timing adjustment value is received, and from the received timing adjustment value is determined an integer portion and a fractional portion. In the frequency domain, the determined fractional portion is applied by rotating a signal. Optionally, a phase shift may also be imposed with the rotation. In the time domain, the determined integer portion is applied by one of inserting samples in the rotated signal or removing samples from the rotated signal in an amount corresponding to the determined integer portion. After the signal rotation to apply the fractional portion, the active sub-carriers are mapped, and the transition from frequency domain to time domain occurs by means of an inverse Fourier transform. A cyclic prefix CP may be added after the Fourier transform, separately or functionally combined with the integer portion shift by modifying the size of the CP to impose the determined integer portion. After other conventional processing known in the art, the rotated signal as advanced / delayed by the sample removal / addition is then transmitted.

Description

technical field [0001] The exemplary and non-limiting embodiments of the present invention relate generally to wireless communication systems, and, more particularly, to timing adjustments in OFDM transmitters. Background technique [0002] The definitions of various abbreviations appearing in this specification and / or drawings are as follows: [0003] 3GPP Third Generation Partnership Project [0004] BB baseband [0005] BS base station [0006] CORDIC Coordinate Rotation Digital Computer [0007] CP cyclic prefix [0008] DAC digital-to-analog converter [0009] DC direct current (in this context: zero frequency) [0010] DFT Discrete Fourier Transform [0011] DFTS Discrete Fourier Transform Spread Spectrum [0012] EUTRAN Evolved Universal Terrestrial Radio Access Network [0013] FIR finite impulse response [0014] IEEE Institute of Electronics and Electrical Engineers [0015] IDFT Inverse Discrete Fourier Transform [0016] IQ In-phase / Quadrature [001...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2626H04W56/0005H04L27/2662H04L27/2655H04L27/2646
Inventor Z·萨法尔
Owner NOKIA TECHNOLOGLES OY
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