Method of mapping chips of a spread out symbol to sub-channels of a multi-carrier transmission network
A transmission channel and transmission network technology, applied in the field of mapping spreading code chips to sub-channels in a multi-carrier transmission network
Inactive Publication Date: 2005-07-20
MITSUBISHI ELECTRIC CORP
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In this paper, the proposed mapping is not optimal when large anticorrelations may occur for some subchannels mapped to consecutive chips of the spreading code
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The present invention concerns a method of mapping chips of a spread out symbol to sub-channels of a group of sub-channels of a Multi-Carrier transmission channel of a Multi-Carrier transmission network, the spread out symbol being formed by multiplying a data item to be transmitted by elements of a spreading sequence, the mapped chips being further modulated using an orthogonal frequency division multiplexing modulation, each sub-channel of the Multi-Carrier transmission channel being defined by a carrier frequency of the Multi-Carrier transmission channel and a time slot wherein an orthogonal frequency division multiplexing symbol is transmitted, characterised in that the chips are ordered in a predetermined order, the first chip is mapped to a sub-channel and each following chips are mapped to a sub-channel which has the same carrier frequency or the same time slot as the sub-channel of which the previous chip has been mapped to. The method concerns also a method the de-mapping and associated devices.
Description
technical field The invention relates to a method for mapping spreading code chips to subchannels of a subchannel group in a multicarrier transmission network. Background technique In multicarrier transmission networks that use spreading sequences to multiply data items to be transmitted, such as multicarrier code division multiple access transmission networks (which are more familiarly known as MC-CDMA transmission networks), or orthogonal frequency division and Code division multiplexing transmission network (its more familiar name is OFCDM transmission network), in the transmission network, before orthogonal frequency division code division multiplexing modulation and transmission, the L code is mapped to the multi-carrier transmission network L subchannels, each spreading code of said L chips is formed by multiplying a data item to be transmitted by L elements of said spreading sequence. OFCDM and MC-CDMA transmission networks use orthogonal spreading sequences in ord...
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IPC IPC(8): H04J11/00H04B1/69H04L5/02H04L25/03H04L27/26
CPCH04B1/692H04L5/026H04L27/2608H04L2025/03414H04L5/0044
Inventor D·莫捷
Owner MITSUBISHI ELECTRIC CORP