 for various A-MAPs [2] Fractional Frequency Reuse in frequency reuse-1 partition, the non-user-specific A-MAP is encoded with an effective code rate of 1/12; otherwise, when the non-user-specific A-MAP is located in the power-boosted frequency reuse-3 partition, it is encoded with code rate of 1/4. The encoded bit sequence is modulated using QPSK modulation. As shown in Figure 10-5, for each transmit antenna, the complex-valued symbols at the output of the SFBC encoder denoted by SN-US[0] to SN-US[LN-US - 1] are mapped to renumbered tone-pairs A[(LHF + Lpc)/2] to A[(LHF + LPC + LN-US)/2 - 1], where refers to the array of renumbered A-MAP tone-pairs obtained via renumbering all tone pairs within the distributed LRUs in the A-MAP region in a time first manner (i.e., tone-pairs of distributed LRUs in the A-MAP region are rearranged into a one-dimensional array in a time first manner and subsequently an A-MAP channel is formed by tone-pairs in a particular segment of that array), LHF is the number of tones required to transmit the entire HARQ feedback A-MAP, Lpc is the number of tones required to CHAPTER 10 The IEEE 802. 16m Physical Layer (Part II) A[m-2] A[m-1] A[m+1] Mapping and Renumbering A[m+NMLRU/2-2] A[m+NMLRU/2-1] A[LspNsymNA-MAP-2] A[LspNsymNA-MAP-1] FIGURE 10-5 An illustration of the formation of MLRUs for A-MAPs transmit the entire power control A-MAP; LN-US is the number of tones required to transmit the non- user specific A-MAP. As shown in Figure 10-5, it is assumed that each distributed LRU consists of LSP tone-pairs per symbol, the renumbered A-MAP tone-pairs are denoted by A[m], m = 0,1, .,LspNsymNa-MAP - 1 where NA-MAP is the number of distributed LRUs allocated to the A-MAP and Nsym is the number of OFDM symbols per subframe. The MS initially decodes the non-user- specific A-MAP in the primary frequency partition to obtain the information for decoding the assignment A-MAPs and HARQ feedback A-MAPs. The non-user-specific A-MAP IE comprises: assignment A-MAP size (8 bits), i.e., the number of assig