Patent ID: 8401117
Filing Date: 2013-03-19
Classification: H04L

Abstract:
1. A method for fast automatic modulation recognition in an adaptive modulation based cognitive software defined radio (SDR), comprising: a. receiving a signal from a transmitter into the SDR; b. inputting a frame of data r(k) from the signal; c. estimating the signal to noise ratio (SNR) for said frame of data r(k); d. feeding back the channel condition to the transmitter; e. selecting one of a plurality of predetermined modulation schemes from a database; f. determining for said one of a plurality of predetermined modulation schemes whether SNR(r(k)) is less than or equal to a predetermined threshold T g. reporting a failure if SNR(r(k)) is less than or equal to a predetermined threshold T h. estimating the mean b i. calculating ∥r(k)−{circumflex over (b)} j. accumulating to calculate k. repeating each of steps e. to j. for each of the other plurality of predetermined modulation schemes from a database; l. finding the minimum value of m. determining whether [K/SNR(r(k))−g(I)] is less than a predetermined threshold D; and n. reporting the modulation scheme if the determination in step m is yes and reporting a failure if said determination is no.