 each transmit antenna, the complex-valued symbols at the output of SFBC encoder, denoted as SHF[0] to SHF[LHF - 1], are mapped to tone-pairs from A[0] to A[LHF/2 - 1], where A is the array of renumbered A-MAP one-pairs and LHF is the number of tones required to transmit the entire HARQ feedback A-MAP. The groups of HARQ feedback A-MAP bits are indexed sequentially from index 0 within a HARQ feedback A-MAP region in the mapping process [2]. There is one HARQ feedback A-MAP region in each DL subframe. The HARQ feedback A-MAP IE consists of one bit corresponding to HARQ ACK/NACK information. The power control A-MAP contains closed-loop power control commands for uplink transmission which are transmitted by the BS to every MS operating in closed-loop power control mode. Figure 10-5 illustrates the physical layer procedures for processing the power control A-MAP-IE. The ith power control A-MAP-IE comprises two bits. The ith and +1)th power control A-MAP IEs are mapped to two QPSK symbols which are repeated twice, as depicted in Figure 10-5. The ith power control A-MAP may also be mapped to two QPSK symbols for transmitting to the corresponding MS with poor channel conditions. An appropriate power boosting factor is applied to the ith power control A-MAP IE; NPC-A-MAP where NPC-A-MAP is the number of power control A-MAP IEs. The power boosting factors are determined by the management entity to satisfy the link performance. For each transmit antenna, symbols at the output of SFBC encoder, denoted by SPC[0] to SPCLLpc- are mapped to tone-pairs from A[LHF/2] to A[(LHF + Lpc)/2 -1], where A refers to the array of the renumbered A-MAP tone-pairs and LPC is the number of tones required to transmit the entire power control A-MAP. The power control A-MAP IE comprises two bits corresponding to values (-0.5, 0, 0.5, 1 dB) for transmit power adjustment. The Assignment A-MAP includes one or multiple Assignment A-MAP IEs where each assignment A-MAP IE is encoded separately. Figure 10-4 describes the procedure for constructing Assi