mation and data detection. The chase combining HARQ scheme with a maximum re-transmission delay of four frames and up to four re-transmissions were assumed for the uplink simulations. Non-ideal channel estimation was assumed in the uplink and signaling errors were modeled for the primary fast-feedback channel (in UMa and RMa cases), the secondary fast-feedback channel (in InH and UMi scenarios), the HARQ feedback channel, and sounding estimation. Dynamic overhead due to the primary and secondary fast-feedback, as well as HARQ feedback channels, and fixed overhead corresponding to long-term covariance matrix, initial ranging, and bandwidth request channels were realistically modeled. In the downlink, the Assignment A-MAP overhead dynamically varies as a function of the number of active users over the radio frame. The average DL/UL Assignment A-MAP overhead is taken into consideration in the calculation of the cell spectral and cell edge user spectral efficiencies. The overhead associated with the HARQ Feedback A-MAP is based on the number of required ACK/ NACK derived from the uplink system-level simulations under each test environment. A fixed over- head of one OFDM symbol per frame is assumed for the primary and secondary preambles in both TDD and FDD duplex schemes. The fixed overhead due to the midamble is one OFDM symbol per frame in both TDD and FDD modes. There are 20 logical resource units over 5 OFDM symbols in every superframe that are used for the superframe headers. In the uplink, the overhead associated with the primary fast-feedback channel is calculated assuming a reporting period of 5 ms for the UMa and the RMa for all users/sectors. The CQI or PMI feedback is sent either through the secondary fast- feedback channel or MAC management messages. In both cases, the reporting period is 5 ms in both TDD and FDD modes. The overhead of the HARQ feedback channel was dynamically calculated based on the required ACK/NACK from the downlink system-level simulations for each test envi- ronment. Although the lon