Method and apparatus for pilot frequency multiplexing in OFDM system

A pilot frequency reuse and pilot frequency technology, applied in the field of communication, can solve the problems of performance degradation, less CAZAC sequence, short CAZAC sequence, etc., to achieve the effect of increasing the length and increasing the number of orthogonal channels

Active Publication Date: 2008-02-27
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0009] However, in the above-mentioned existing method 1, there are fewer orthogonal CQI pilot channels, because SB2 is completely used for the transmission of DM pilots, and SB1 is used for CQI pilots, which means that the resources reserved for CQI pilots are 1/2 of all pilot resources, therefore, this method cannot flexibly reserve more resources for CQI pilots
In addition, when the UE speed is high, since the first column of pilots in this method cannot provide more help for the channel estimation of the UE terminal, it will lead to performance degradation
[0010] In the above-mentioned existing method 2, the CAZAC sequence used for the CQI pilot

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  • Method and apparatus for pilot frequency multiplexing in OFDM system
  • Method and apparatus for pilot frequency multiplexing in OFDM system
  • Method and apparatus for pilot frequency multiplexing in OFDM system

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Embodiment Construction

[0055] The present invention proposes a packet-based CQI pilot multiplexing scheme, which increases the length of the CAZAC sequence through the combination of CDM, FDM and TDM, and provides more CAZAC sequences for the premise of maintaining the number of schedulable terminals. Frequency domain scheduling provides an effective solution for CQI-based uplink frequency domain scheduling.

[0056] The present invention combines the CQI pilot multiplexing method of CDM, FDM and TDM groups, which can not only ensure the number of CQI pilot channels, but also provide more CAZAC sequences for frequency domain scheduling.

[0057] The method of the present invention is shown in Figure 8. First, the pilot mapping is performed at the sending end, and then the pilot extraction is performed at the receiving end according to the mapping method of the sending end. The whole process is specifically described as follows:

[0058] Step 81. After the transmitting end transforms the generated pi...

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Abstract

This invention provides a CQI pilot multiplex method based packeting including: a transmission end converts a generated pilot sequence to a frequence domain then carries out mapping of sub-carriers in terms of the following mode: distributing DM pilot frequences crossly on two short blocks of a sub-frame on a frequency domain and interval of sub-carries of DM pilot freequency on each short block is the same, dividing CQI pilot frequency to several sets to be distributed on the preserved sub-carriers on two short blocks and the numbers and intervals of the sub-carriers of each set of CQI pilot. This invention also provides a CQI pilot multiplexing device based on packeting including a mapping unit of a transmission end used in mapping sub-carriers of pilot frequency after converting the generated pilot sequence to the frequency domain.

Description

technical field [0001] The present invention relates to the field of communication, in particular to a pilot multiplexing method and device in an OFDM system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) technology has reached a consensus in the industry as a basic transmission technology used in the B3G mobile communication system. In the OFDM communication system defined by the 3GPP LTE plan, the uplink adopts a Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM: Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing) scheme. Each subframe includes two short blocks and six (for a Frequency Division Duplex (FDD: Frequency Division Duplex) system) or eight (for a Time Division Duplex (TDD: Time Division Duplex) system) long blocks. [0003] As shown in FIG. 1 , the uplink subframe structure of the FDD system defined by the 3GPP LTE plan....

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L5/0007H04L5/0048
Inventor 张瑞齐孙韶辉王映民
Owner DATANG MOBILE COMM EQUIP CO LTD
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