Patent ID: 8320526

Claim:
A spectrum optimization method for a Digital Subscriber Line (DSL) system, comprising: calculating a benefit-cost ratio matrix including a plurality of benefit-cost ratios according to acquired information of respective subcarriers on a line to be optimized, wherein each of the plurality of benefit-cost ratios corresponds to a combination of a certain advisable transmission power s b and a certain subcarrier, and represents a benefit-cost ratio when the certain advisable power s b is adopted at the certain subcarrier; obtaining optimized transmission power of a subcarrier to be optimized according to the benefit-cost ratio matrix; calculating, according to the optimized transmission power of the subcarrier to be optimized, a transmission rate of the line to be optimized; and comparing the transmission rate of the line to be optimized with a target rate of the line to be optimized, and if the transmission rate is less than the target rate, updating acquired information of an optimized subcarrier on the line to be optimized, and recalculating optimized transmission power of the subcarrier to be optimized on the line to be optimized.