INTEGRATED CIRCUIT, TRANSMITTER AND TRANSMISSION METHOD
FIG12 is a diagram illustrating a code resource setting rule table according to Embodiment 3 of the present invention
FIG12 is a diagram illustrating a code resource setting rule table according to Embodiment 3 of the present invention. In Embodiment 3 as in the case of other embodiments, different offset patterns are applied to cyclic shift amount candidate X and cyclic shift amount candidate X+4 of the antenna port with identification number 0. Furthermore, in Embodiment 3, different offset patterns are applied to cyclic shift amount candidate 2M (M=0, 1, ...) and cyclic shift amount candidate 2M+1. While a basic offset pattern is applied to one of cyclic shift amount candidate 2M and cyclic shift amount candidate 2M+1, offset pattern "0, 1, 2, 3" or "0, -1, -2, -3" is applied to the other (refer to FIG12). In contrast, as shown in FIG12, while the basic offset pattern is applied to one of cyclic shift amount candidate 2M and cyclic shift amount candidate 2M+1, offset pattern "0, 1, 2, 3" or "0, -1, -2, -3" is applied to the other, and it is thereby possible to reduce the bias in the cyclic shift amount applied to the antenna port with identification number 1. To be more specific, in FIG12, when attention is focused on the cyclic shift amount group to which an offset pattern other than the basic offset pattern is applied, the cyclic shift amount pairs corresponding to identification numbers 0 and 1 used for 2-antenna transmission are "4, 5", "1, 0," "6, 7" and "3, 2" and the cyclic shift amount is more distributed, with less bias.
diagram
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Embodiment
5
Embodiment
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cyclic shift amount candidates cyclic shift amount candidate
2
than
6
Embodiment
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antenna ports andFIG.
3
Embodiment
['1. An integrated circuit located in an apparatus, said integrated circuit comprising circuitry, which, in operation, is configured to perform a process, said process comprising the steps of: generating, for each of a plurality of antenna ports, respective reference signals using information relating to a first cyclic shift index, the first cyclic shift index being associated with a first antenna port of the plurality of antenna ports; and mapping, for each of the plurality of antenna ports, the respective reference signals to frequency resources, wherein, when the first cyclic shift index is less than half of a total number of cyclic shift indexes, the respective reference signals of each of the plurality of antenna ports are mapped to a first frequency resource; and when the first cyclic shift index is greater than or equal to half of the total number of cyclic shift indexes, the respective reference signals of a half of the plurality of antenna ports are mapped to the first frequency resource and the respective reference signals of the remaining half of the plurality of antenna ports are mapped to a second frequency resource that is different from the first frequency resource; and transmitting the mapped respective reference signals.']