38results about How to "Improve linearization performance" patented technology

The invention relates to a method and system for wideband digital pre-distortion linearization, which is used to overcome the influence of memory effect in radio frequency power amplifier, to expand digital pre-distortion linearization bandwidth, and to improve digital pre-distortion linearization performance. The method and system can get an in-band pre-distortion signal and an out-of-band pre-distortion signal according to the characteristic parameter of the amplifier; the in-band pre-distortion signal is up-converted and the up-converted signal is added to the out-of-band pre-distortion signal, which is not up-converted, then the combined signal is inputted to the power amplifier as an input signal; a part of the output signal from the power amplifier, serving as a feedback signal, can be compared with the original input signal, and the characteristic parameter of the amplifier for generating the in-band pre-distortion signal and the out-of-band pre-distortion signal is adaptively regulated according to the comparison result, so that the waveform of time domain or the frequency domain of the feedback signal can be close to that of the original input signal as much as possible.

The invention discloses a method and device for eliminating clock jitter in analog-to-digital conversion and a digital pre-distortion method and relates to the pre-distortion technology in the communication field. The method for eliminating clock jitter in analog-to-digital conversion is characterized by comprising the steps that step 1, an analog signal z (t) is received; step 2, a clock signal h (t) is offered to an analog-to-digital conversion module, meanwhile, an arithmetic product of the clock signal h (t) and a single-tone signal m (t) serves as a reference signal q (t) and is added to the analog signal z (t), so that a composite signal r (t) is obtained; step 3, analog-to-digital conversion is conducted on the composite signal r (t) through the analog-to-digital conversion module, so that two completely identical composite signals rjit (n) are obtained; step 4, after a jitter sequence of one of the two composite signals rjit (n) is estimated, a clock jitter sequence is obtained; step 5, clock jitter elimination is conducted on the other of the two composite signals rjit (n) through clock jitter sequence, so that a purified digital signal y (n) with clock jitter eliminated is obtained.

A multiband signal is generated by combining two or more input signals separated in frequency. Depending on the bandwidth of the multiband signal, the input signals are combined before or after predistortion. If the bandwidth of the multiband signal is less than a predetermined bandwidth threshold, the input signals are combined and predistortion is applied to the combined signal to generate a multiband signal. If the bandwidth of the multiband signal is greater than a predetermined bandwidth threshold, the individual input signals are predistorted and the predistorted individual input signals are then combined to generate the multiband signal.