Section: 6.9.1 Modulation
Content: The block of bits transmitted on one PHICH in one subframe shall be modulated as described in clause 7.1, resulting in a block of complex-valued modulation symbols, where . Table 6.9.1-1 specifies the modulation mappings applicable for the physical hybrid ARQ indicator channel. Table 6.9.1-1: PHICH modulation schemes. The block of modulation symbols shall be symbol-wise multiplied with an orthogonal sequence and scrambled, resulting in a sequence of modulation symbols according to where and is a cell-specific scrambling sequence generated according to clause 7.2. The scrambling sequence generator shall be initialised with at the start of each subframe. The sequence is given by Table 6.9.1-2 where the sequence index corresponds to the PHICH number within the PHICH group. Table 6.9.1-2: Orthogonal sequences for PHICH