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Spectral shaping of multicarrier signals

A technology of multi-carrier signals and sub-carriers, applied in the field of computer program products to transmit multi-carrier signals representing data symbols, can solve problems such as poor performance, inability to clearly solve in-band spectrum requirements, and inability to provide spectrum attenuation, achieving low complexity performance, the effect of reducing computational requirements

Inactive Publication Date: 2012-03-28
HUAWEI TECH CO LTD
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Problems solved by technology

However, a problem with this prior art solution is that it does not explicitly address the in-band spectrum requirement, which leads to poor performance
Also, this solution does not provide a flexible way to obtain sharp spectral attenuation
[0022] Therefore, prior art solutions have a number of problems related to providing transmitted multi-carrier radio signals that meet both the in-band and out-of-band suppression requirements of the standardized spectrum emission mask

Method used

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  • Spectral shaping of multicarrier signals
  • Spectral shaping of multicarrier signals
  • Spectral shaping of multicarrier signals

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Embodiment Construction

[0050] The following will sometimes use the OFDM system as an illustration to explain the invention applicable to almost all multi-carrier systems. However, the present invention is not limited to use in this particular system, but can be implemented in almost any multi-carrier system as it is well known to those skilled in the art.

[0051] The multi-carrier signal z(t) to be generated and transmitted takes the following baseband equivalent form:

[0052] z ( t ) = Σ i s i ( t - iT ) (Equation 1)

[0053] Here, 1 / T is the symbol rate, that is, the rate at which data symbols are transmitted. The symbol interval T is usually the length of the time interval during which the data symbol vectors are transmitted. Therefore, a new multicarrier symbol is transmitted...

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Abstract

A method for generating and transmitting a multicarrier signal representing data symbols, where the multicarrier signal is a linear combination of subcarriers, is disclosed, as well as a transmission entity. The generation and transmission is characterized by - modulation of base signals with the data symbols, wherein each one of the base signals is a weighted sum of the subcarriers, whereby each one of the subcarriers is weighted by an element of a weighting vector residing in a nullspace of a constraint matrix, wherein - the constraint matrix represents constraints limiting a magnitude of the multicarrier signal's Fourier transform at frequencies outside a designated bandwidth.

Description

technical field [0001] The invention relates to a method for generating a multicarrier signal representing data symbols, wherein the multicarrier signal is a linear combination of subcarriers, as defined in the preamble of claim 1 . [0002] The invention also relates to a method for transmitting a multicarrier signal representing data symbols, wherein the multicarrier signal is a linear combination of subcarriers, as defined in the preamble of claim 14 . [0003] The invention also relates to a transmission entity arranged for transmitting a multicarrier signal representing data symbols, wherein the multicarrier signal is a linear combination of subcarriers, as defined in the preamble of claim 19 . [0004] The invention also relates to a computer program and a computer program product implementing the method of the invention. Background technique [0005] Multi-carrier transmission systems, such as systems using Orthogonal Frequency Division Multiplexing (OFDM), Discrete ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00
CPCH04L27/2634H04L25/03834H04L27/26265
Inventor 雅普·范德比克
Owner HUAWEI TECH CO LTD
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