| 摘要 |
A system for robust transmission in an orthogonal frequency division multiplexed (OFDM) communication network is disclosed. An individual wireless communication device is assigned a set of OFDM tones for transmission in an uplink timeslot. If the received signal is not satisfactory, the number of OFDM tones assigned to the individual wireless communication device may be doubled such that the OFDM signal is duplicated in the additional set of OFDM tones. This process can be extended to multiple additional sets of OFDM tones. The multiple sets of OFDM tones may be combined at the base station to enhance recovery of the original transmitted signal. The assigned OFDM tones need not be contiguous within a block of available tones. Because a large number of OFDM tones are available, the concept may be extended to a large number of duplicate sets of OFDM tones. In a Group Call operation, each wireless communication device in the call group may be assigned multiple sets of OFDM tones to provide for more robust transmission. |
