PICO system
PICO system
Optical Repeater system
RF Repeater System
Digital Pre-Distortion, DPD
Linearity and high efficiency are crucial requirements for RF power amplifier. In real situation, power amplifiers have high efficiency at their non-linear regions. To tackle this issue there are several approaches, one of them is digital pre-distortion.Digital Pre-Distortion (DPD) is one of the most fundamental technique for PA optimization in wireless communication systems. Running PA at non-linear region causes amplitude clipping and frequency dispersion.Narrow band applications like TETRA subject to their modulation type and site planning character require a linearity of better than 60 dBc of 3rd order inter-modulation. PAMR industry from 3G+ system characterized a wide-band signal emission requires ACPR better than 45dBc.Integrated with DPD technology, PA performance will be analysis and pre-process the input signal via a inversely non-linearity algorithm. That eventually optimize the output linearity of PA and the overall efficiency.Channelized Interference Cancellation System, CICS
RF repeater systems are expected to extend the base-station coverage to some barrier terrain. During the case, signal isolation between the signal input and the output of the repeater determines the overall system gain . We provide our digital self-interference cancellation technique for the application need. The proposed technique is shown to significantly mitigate the self-interference signal as well as the associated input output impairments. In the proposed technique, an auxiliary input chain is used to obtain a digital-domain copy of the transmitted Radio Frequency (RF) self-interference signal. The self-interference copy is then used in the digital-domain to cancel out both the self-interference signal and the associated impairments. Furthermore, to alleviate the input phase noise effect, a common oscillator is shared between the auxiliary and ordinary receiver chains. A thorough analytical and numerical analysis for the effect of the output and input impairments on the cancellation capability of the proposed technique is presented. The overall performance is numerically investigated showing that using the proposed technique, the self-interference signal could be mitigated to 20dB higher than the input noise floor.Digital Channelized module, DCM
We have presented a FFT algorithm based of parallel pipeline architecture within a FPGA device for the implementation of digital channelized module. Each DCM provides 8 AD and DA channels to implement 8 programmable channel for use. Maximum conversion gain for the module is 60dB and 0dBm as maximum output. Module could be integrated with other functional module like CICS, etc.Passive Components