Patent ID: 7817746
Filing Date: 2010-10-19
Classification: H04B,H04L

Abstract:
1. A peak factor reduction unit comprising: a first path including a correction signal generation unit for generating a correction signal used for peak factor reduction of a complex input signal supplied as a digital signal; a second path including a delay unit used for timing adjustment; and a subtraction unit for subtracting said correction signal from said complex input signal branched to said first and second paths, then passed through said delay unit, thereby outputting a complex signal of which peak factor is reduced within an allowable range; wherein said first path includes a first baseband filter for limiting a band of a complex input signal supplied to said correction signal generation unit; a first over-sampler for multiplying the number of samples of said complex input signal of which band is limited by said first baseband filter by (n) times (n>2); and a first interpolation filter paired with said first over-sampler; wherein said second path includes a second over-sampler for multiplying the number of samples of said complex input signal by (n) times; and wherein said correction signal generation unit generates a correction signal used for peak factor reduction from an interpolated complex signal, thereby said subtraction unit outputs said peak factor reduced interpolated complex signal.