Method and apparatus for mapping PHICH to physical subcarrier
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A mapping method and sub-carrier technology, applied in the field of mapping PHICH to physical sub-carriers, can solve the problem that the FDD system cannot be put into application, and achieve the effect of small performance impact and guaranteed diversity gain.
Inactive Publication Date: 2008-05-21
ZTE CORP
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At present, no suitable solution has been designed for the mapping of PHICH,
Method used
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example 1
[0062] In the case of mapping the correct acknowledgment message and / or the error acknowledgment message to 3 OFDM symbols, the corresponding specific parameters are as follows:
[0063] N RE DL = 300 , N RB DL = 25 , N SC RB = 12 , N T = 3, N ID Cell = 1 , m=1
[0064] The corresponding derived parameters are:
[0065]
[0066]
[0067]
[0068] l ( i , m ) = ( i + m + N ID Cell ) ...
example 2
[0083] In the case of mapping a correct acknowledgment message and / or an error acknowledgment message to 1 OFDM symbol, the corresponding specific parameters are as follows:
[0084] N RE DL = 300 , N RB DL = 25 , N SC RB = 12 , N T = 3, N ID Cell = 1 , m=1
[0085] The corresponding derived parameters are:
[0086]
[0087]
[0088] l(i,m)=0
[0089] l(0,1)=l(1,1)=l(2,1)=0;
[0090]
[0091]
[0092]
[0093]
[0094] The three resource groups of the m-th PHICH group are respectively mapped to the 12th, 13th, 15th, 16th, and 84th, 85th, 87th, and 88th of the 0th OFDM symbol , and on the 224th, 225th, 227th, and 228t...
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Abstract
The invention provides a mapping method and device for an indication channel PHICH of a physical hybrid automatic repeat request to a physical sub-carrier, comprising a plurality of mapping steps of a frequency domain. The invention is characterized in that: a plurality of usable physical sub-carriers of an FDD system is evenly divided into four areas; the three resource groups of a PHICH are one-to-one correspondence with the three areas of the four areas. The invention has the advantages of ensured diversity gain of PHICH and simple realization and little influence on performance of other downlink physical channels.
Description
technical field [0001] The present invention relates to the field of communications, and in particular, to a method and device for mapping PHICH to physical subcarriers. Background technique [0002] The rapid development of digital communication systems puts forward higher requirements for the reliability of data communication. However, under harsh channels, especially in high data rate or high-speed mobile environments, serious problems such as multipath interference and Doppler shift affect system performance. Therefore, effective error control technology, especially Hybrid Automatic Repeat Request (HARQ) technology has become a research hotspot in the communication field. [0003] In the FDD (Frequency Division Duplex, Frequency Division Duplex) system of the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) long-term evolution (Long Term Evolution, LTE) project, the downlink physical channel includes a physical control format indicator chann...
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