Importance

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Abstract

Optimum bit rates and power levels are determined for subchannels in multicarrier communication systems. A tangent of the rate-power curve has a slope .lambda.. The slope is defined by the quotient difference between high/low power and high/low rate. A particular .lambda. is evaluated to find its corresponding total power followed by an update of .lambda., in the form of an increase or decrease, to get closer to the optimal solution. Each .lambda. is evaluated to find the optimal operating point for each subchannel on the rate-power curve by summing the power allocated to the subchannels, and comparing the result to the power budget. Look-up tables are stored for individual channels, but similarity between channels permits joint use of look-up tables by multiple channels. The tables are used to determine the rate-power characteristics at each iteration. An optimal solution is found when either a newly chosen power allocation meets the power budget exactly or a newly chosen power budget equals the high or low power of a previous iteration.

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First Claim