Abstract
In an orthogonal frequency division multiplexing (OFDM) system a transmitter and/or receiver transmits separate data streams on the orthogonal spatial channels. each spatial channel can use the same set of OFDM subcarriers and can utilize the multipath characteristics of the spatial channel to transmit the additional data without an increase in frequency bandwidth. spatial frequency subcarrier modulation assignments may be based on each sub-carrier dynamically allocation can also be based on dynamically allocated to each spatial channel to help maximize channel data carrying capacity. In some embodiments each spatial channel can be connected with one of a plurality of spatially diverse antennas are associated. In other embodiments can perform beamforming to allow transmitting and/or receiving signals in a spatial channel.
In an orthogonal frequency division multiplexed (OFDM) system a transmitter and/or receiver communicate separate data streams on non-orthogonal spatial channels. Each spatial channel may use the same set of OFDM subcarriers and may take advantage of the multipath characteristics of the spatial channel allowing the communication of additional data without an increase in frequency bandwidth. Space-frequency subcarrier modulation assignments may be dynamically assigned on a per subcarrier basis as well as a per spatial channel basis to help maximize the data-carrying capacity of the channel. In some embodiments each of the spatial channels may be associated with one of a plurality of spatially diverse antennas. In other embodiments beamforming may be performed to allow the transmission and/or reception of signals within the spatial channels.
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