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Pre-compensation method and device for descending frequency offset of orthogonal frequency division multiple access (OFDMA) communication system

A communication system and pre-compensation technology, applied in the field of communication

Active Publication Date: 2012-03-14
SANECHIPS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a downlink frequency offset pre-compensation method and device for an OFDMA communication system, so as to at least solve the above problem that the downlink signals of users occupying different subcarriers cannot be properly compensated for frequency offsets, so that they cannot be used for Problems in scenarios where the frequency offsets of different users are quite different

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  • Pre-compensation method and device for descending frequency offset of orthogonal frequency division multiple access (OFDMA) communication system
  • Pre-compensation method and device for descending frequency offset of orthogonal frequency division multiple access (OFDMA) communication system
  • Pre-compensation method and device for descending frequency offset of orthogonal frequency division multiple access (OFDMA) communication system

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Embodiment Construction

[0012] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0013] figure 1 It is a flowchart of a downlink frequency offset pre-compensation method for an OFDMA communication system according to an embodiment of the present invention, including the following steps:

[0014] Step S102, the base station obtains the frequency offset value and the estimated value of the uplink channel corresponding to the subcarrier occupied by the user terminal (UE);

[0015] For example, UE1 occupies resource block 1 (RB1) in the frequency domain, and RB1 corresponds to the 1st to 12th subcarriers (each RB corresponds to 12 subcarriers), then the 1st to 12th subcarriers occupied by UE1 can be obtained through frequency offset estimation. The frequency offset value f correspo...

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Abstract

The invention discloses a pre-compensation method and device for the descending frequency offset of an orthogonal frequency division multiple access (OFDMA) communication system. The method comprises the following steps: a base station obtains a frequency offset value and an ascending channel estimation value corresponding to a subcarrier occupied by a user terminal; the base station obtains the value of a frequency offset pre-compensation parameter corresponding to the subcarrier according to the frequency offset value, the ascending channel estimation value and the transceiving signal module of the OFDMA communication system relevant to the frequency offset; and the base station uses the obtained value of the frequency offset pre-compensation parameter to carry out frequency offset pre-compensation to a descending signal on the subcarrier occupied by the user terminal. According to the method and the device, the descending signal of user terminals which occupy different subcarriers can be subjected to frequency offset pre-compensation by a respective proper frequency offset pre-compensation parameter, and therefore the method and the device can be used for different occasions with bigger user equipment (UE) frequency offsets.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a downlink frequency offset pre-compensation method and device for an OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access) communication system. Background technique [0002] In a wireless communication system using OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access) technology, such as 3GPP (3rdGeneration Partnership Project, third generation mobile communication partner project) LTE (Long Term Evolution, long-term evolution) system, if If the crystal oscillators of the user terminal (User Equipment, UE) and the base station are not aligned, the downlink signal will be affected by the frequency offset. Moreover, when the user terminal moves rapidly, the Doppler effect will also cause a frequency offset effect on the downlink signal. When the frequency offset is large, the inter-su...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor 萧少宁曹国强
Owner SANECHIPS TECH CO LTD
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