Method of mapping chips of a spread out symbol to sub-channels of a multi-carrier transmission network

Method of de-mapping chips of a spread out symbol from sub-channels of a group of sub-channels of a Multi-Carrier transmission channel of a Multi-Carrier transmission network, the chips being previously demodulated using an orthogonal frequency division multiplexing demodulation, 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 received, characterised in that the group of sub-channels comprise sub-channels having at least two different frequencies and at least two different time slots, a first chip is de-mapped from a sub-channel and each of the following chips is de-mapped respectively from 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 de-mapped from.

Device for 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 Mufti-Carrier transmission. channel and a time slot wherein an orthogonal frequency division multiplexing symbol is transmitted, characterized in that the group of sub-channels comprise sub-channels having at least two different frequencies and at least two different time slots, the chips are ordered in a predetermined order, the devise comprises means for mapping the first chip to a sub-channel and means for mapping each of the following chips to a respective 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.

Device for de-mapping chips of a spread out symbol from sub-channels of a group of sub-channels of a Mufti-Carrier transmission channel of a Mufti-Carrier transmission network, the chips being previously demodulated using an orthogonal frequency division multiplexing demodulation, each sub-channel of the Mufti-Carrier transmission channel being defined by a carrier frequency of the Mufti-Carrier transmission channel and a time slot wherein an orthogonal frequency division multiplexing symbol is received, characterized in that the group of sub-channels comprise sub-channels having at least two different frequencies and at least two different time slots, the device has means for de-mapping a first chip from a sub-channel, and means for de-mapping each of the following chips from a respective sub-channel which has the same carrier frequency or the same time slot as the sub-channel of which the previous chip has been de-mapped from.