upport Permutation Support Mode Index Support (Diversity Allocation) (Localized Allocation) MIMO Mode 0 Yes (Ns = 2) MIMO Mode 1 Yes (Ns=2) Yes (Ns=2) MIMO Mode 2 MIMO Mode 3 Yes (Ns = 2) MIMO Mode 4 MIMO Mode 5 Yes (Ns = 1) Yes (Ns = 1) feedback on the quantized wideband correlation matrix independent of the MIMO feedback requested in the Feedback Polling A-MAP IE. The quantized wideband correlation matrix may be used for wideband beamforming. As shown in Table 10-25, MIMO feedback mode 0 is used for the open- loop single-user MIMO (SFBC) and spatial multiplexing. The MS measures wideband CQI for both SFBC and spatial multiplexing and reports the CQI and the spatial rate. It must be noted that spatial rate 1 indicates SFBC mode with precoding and spatial rate 2 denotes rank-2 spatial multiplexing with precoding. MIMO feedback mode 1 is associated with the CDR scheme with spatial rate 1/2 which is used with distributed logical resource units. MIMO feedback mode 2 is used with spatial multiplexing in localized permutation zones to facilitate frequency-selective scheduling, in which the spatial rate indicates the preferred number of MIMO streams. The sub-band CQI, in this case, corresponds to the selected rank. MIMO feedback mode 3 is used in conjunction with the closed-loop SU-MIMO mode and spatial multiplexing in localized permutation zones in order to achieve frequency selective scheduling. The spatial rate indicates the preferred number of MIMO streams and the sub-band CQI indicates the selected rank. MIMO feedback mode 4 is used with the closed-loop SU-MIMO and wideband beamforming. In this mode, the MS measures and sends the wideband CQI. The wideband CQI is estimated at the MS assuming short-term or long-term precoding at the BS according to the feedback period. The channel state information may be obtained at the BS based on the feedback of the correlation matrix or via wideband PMI. MIMO feedback mode 5 is used for an open-loop MU-MIMO CHAPTER 10 The IEEE 802.1 16m Physical Layer (Part II) Table 10-25 MIMO