Digital predistortion for mitigating transmitter-induced receiver desensitization in carrier aggregation FDD transceivers

In frequency division duplexing (FDD) transceivers, the intermodulation distortion (IMD) created by a nonlinear transmit power amplifier can easily interfere with the receiver (RX) band. This is a particular concern in various carrier aggregation scenarios, and can cause severe own RX desensitization. In this paper, a spur-injection based sub-band digital predistortion (DPD) solution is proposed to mitigate this problem. Compared to earlier works, the proposed DPD parameter learning is performed using the main RX of the device, and thus it does not require an extra observation RX, which implies reduced costs and size. The proposed DPD is tested using computer simulations with practical models for the transmitter (TX) power amplifier and the TX/RX duplexer filters. The TX-induced IMD is suppressed by up to 25 dB at the own RX band, demonstrating a significant improvement in the RX signal-to-interference-and-noise-ratio (SINR).

[1]  Mikko Valkama,et al.  Digital predistortion for mitigating spurious emissions in spectrally agile radios , 2016, IEEE Communications Magazine.

[2]  Hanna Bogucka,et al.  Dynamic spectrum aggregation for future 5G communications , 2015, IEEE Communications Magazine.

[3]  Joseph R. Cavallaro,et al.  Sub-band digital predistortion for noncontiguous transmissions: Algorithm development and real-time prototype implementation , 2015, 2015 49th Asilomar Conference on Signals, Systems and Computers.

[4]  Zhijian Xie,et al.  A Generalized Architecture for the Frequency- Selective Digital Predistortion Linearization Technique , 2013, IEEE Transactions on Microwave Theory and Techniques.

[5]  Mikko Valkama,et al.  DSP-based suppression of spurious emissions at RX band in carrier aggregation FDD transceivers , 2014, 2014 22nd European Signal Processing Conference (EUSIPCO).

[6]  Fadhel M. Ghannouchi,et al.  Channel-Selective Multi-Cell Digital Predistorter for Multi-Carrier Transmitters , 2012, IEEE Transactions on Communications.

[7]  Fadhel M. Ghannouchi,et al.  Reduced-complexity power amplifier linearization for carrier aggregation mobile transceivers , 2014, 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).

[8]  Wenhua Chen,et al.  Transmitter Architecture for CA: Carrier Aggregation in LTE-Advanced Systems , 2013, IEEE Microwave Magazine.

[9]  Junyi Li,et al.  Network densification: the dominant theme for wireless evolution into 5G , 2014, IEEE Communications Magazine.

[10]  Chester Sungchung Park,et al.  Carrier aggregation for LTE-advanced: design challenges of terminals , 2013, IEEE Communications Magazine.

[11]  Chao Yu,et al.  Digital Compensation for Transmitter Leakage in Non-Contiguous Carrier Aggregation Applications With FPGA Implementation , 2015, IEEE Transactions on Microwave Theory and Techniques.

[12]  Walter Hoffmann,et al.  Iterative algorithms for Gram-Schmidt orthogonalization , 1989, Computing.

[13]  Mikko Valkama,et al.  Digital Mitigation of Transmitter-Induced Receiver Desensitization in Carrier Aggregation FDD Transceivers , 2015, IEEE Transactions on Microwave Theory and Techniques.

[14]  References , 1971 .