IMPROVED FRAME STRUCTURE FOR A COMMUNICATION SYSTEM USING ADAPTIVE MODULATION

摘要

A system and method for mapping a combined frequency division duplexing (FDD ) Time Division Multiplexing (TDM)/Time Division Multiple Access (TDMA) downli nk subframe for use with half-duplex and full-duplex terminals in a communicati on system. Embodiments of the downlink subframe vary Forward Error Correction (FEC) types for a given modulation scheme as well as support the implementation of a smart antennae at a base station in the communication system. Embodiments of the system are also used in a TDD communication syste m to support the implementation of smart antennae. A scheduling algorithm allo ws TDM and TDMA portions of a downlink to efficiently co-exist in the same downlink subframe and simultaneously support full and half-duplex terminals. The algorithm further allows the TDM of multiple terminals in a TDMA burst t o minimize the number of map entries in a downlink map. The algorithm limits t he number of downlink map entries to not exceed 2n + 1, where n is the number o f DL PHY modes (modulation/FEC combinations) employed by the communication system.