| 摘要 |
<p>The present invention involves an adaptive digital radio communications architecture which can be reconfigured by reprogramming at least one programmable device, and thus more efficiently use the available bandwidth of a time-varying RF channel and/or to provide a flexible and adaptive digital communications system. In certain embodiments, the programmable device uses a Programmable Logic Device (PLD) to perform the digital communications processing functions of the transmitter or the receiver of a radio communications system. In this context, PLD is a general term representing a family of programmable logic devices; examples of this family are a Programmable Array Logic (PAL), a Complex PLD (CPLD), and a Field Programmable Gate Array (FPGA). The architecture is reconfigurable in the sense that any or all of the digital communications processing algorithms can be modified by reprogramming the PLD. The architecture of the digital communications system can be characterized by the following parameters; the channel symbol rate, the occupied bandwidth, the modulation technique, and the multiple access technique. A reconfiguration is a modification of the architecture of the digital communications system, and can occur by reprogramming the PLD through external control, for example in the event a radio communications base station wishes to change the radio architecture being used for a particular piece of radio spectrum. A reconfiguration can also occur, for example, by dynamically reprogramming the digital communications system depending upon time-varying radio channel conditions, such as the effect of the number of channel users, the offered load, quality of service measurements, or the characteristics of the desired application(s), including voice, data, video and/or tracking. Methods to measure the time varying radio channel conditions are disclosed, and further how those measurements can impact a reconfiguration. This invention discloses how the architecture for the digital communications system can be dynamically reprogrammed based upon current channel conditions and/or through external control. <IMAGE></p> |
