Wideband Compensation of RF Vector Multiplier for RF Predistortion Systems

Xia, Jingjing; Ng, Eric; Boumaiza, Slim

doi:10.1109/tcsii.2016.2548278

Cited by 13 publications

(8 citation statements)

References 5 publications

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“…Both the CS implementation schemes use low-cost and energy efficient passive components to claim the linearisation of the UBB signal. Hence, the hardware complexity, cost and power overhead consumption are minimal in both the CS as compared with HPD [12][13][14][15][16][17] and conventional DPD [9,10]. The feedback path of HPD captures only the original signal bandwidth, unlike DPD where the bandwidth of PD signal is typically five times the input baseband signal which defines the speed of DAC.…”

Section: Hardware Complexity and Power Overhead Consumption Of Apdmentioning

confidence: 99%

“…The performance of the proposed CS for modified APD is summarised and compared with other linearisation techniques in Table 2. The contribution of RF VM in various APD and hybrid linearisation techniques has been appreciated in [11,12,[16][17][18][19][20]. In [16], VM is used in adaptive digitally controlled RF predistortion to linearise PA driven by a 3.7 MHz narrowband signal.…”

Section: State-of-the-art Linearisationmentioning

confidence: 99%

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Analogue predistortion lineariser control schemes for ultra‐broadband signal transmission in 5G transmitters

Gumber

Rawat

2020

IET Microwaves, Antennas & Propagation

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Analogue predistorter (APD) has gained a new significance due to the need for high bandwidth in the fifth generation (5G) communication. As predistorted signal is generated in the analogue domain, it is free from data converter bandwidth limitation and presents an attractive linearisation solution for power amplifier (PA) in the 5G base station. Furthermore, it also finds its application in the multicarrier repeater system for long‐distance communication, where the baseband information is not readily available. However, the performance of the conventional APD is dependent on the appropriate control of gain and phase of the predistorted signal. The state‐of‐the‐art work in analogue linearisation solutions mostly utilises vector multiplier for such a control. This work points out the limitations of such a scheme and proposes a novel control scheme (CS) that is capable of extracting better benefits of the APD. An experimental validation is carried out by linearising 10 W HMC8500 broadband GaN PA, excited by a eight‐component carrier 160 MHz ultra‐broadband long‐term evolution signal. The proposed Type‐II CS delivers an adjacent channel power ratio of −45.05 dBc with an improvement of 18 dB, which is 4 dB better than Type‐I CS.

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Section: Hardware Complexity and Power Overhead Consumption Of Apdmentioning

confidence: 99%

Section: State-of-the-art Linearisationmentioning

confidence: 99%

Analogue predistortion lineariser control schemes for ultra‐broadband signal transmission in 5G transmitters

Gumber

Rawat

2020

IET Microwaves, Antennas & Propagation

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“…In particular, the I/Q modulator and the VM have inherent distortions from their I/Q branches, which can fortunately be calibrated out before use because they are approximately static over a long period of time [42,43].…”

Section: Calibration Of Measurement Setupmentioning

confidence: 99%

“…Once the offsets are resolved, the imbalances are corrected by minimizing the undesired sideband. The frequency dispersive analog circuitry is modelled with four FIR filters for the imbalance terms [43]. These offsets and the imbalance matrix are saved and applied before use of the I/Q modulator.…”

Section: Calibration Of Measurement Setupmentioning

confidence: 99%

“…However only a narrowband calibration is done to simplify the calibration process and ensure that the implementation remains practical. The DC offset voltages and the I/Q imbalances are still corrected, but four real constants are used for the imbalance terms instead of the FIR filters, therefore the frequency dependency of the components are not taken into account [43].…”

Section: Calibration Of Measurement Setupmentioning

confidence: 99%

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Digitally Assisted RF-Analog Self Interference Cancellation for Wideband Full-Duplex Radios

King

Xia

Boumaiza

2018

IEEE Trans. Circuits Syst. II

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The ever-increasing demand for more data from users is pushing the development of alternative wireless technologies to improve upon network capacity. Full-Duplex radios provide an exciting opportunity to theoretically double the available spectral efficiency of wireless networks by simultaneously transmitting and receiving signals in the same frequency band.The main challenge that is presented in the implementation of a full-duplex radio is the high power transmitter leaking to the sensitive receiver chain and masking the desired receive signal to be decoded. This transmitter leakage is referred to as self interference and it is required that this self interference signal be cancelled below the receiver noise floor to achieve the full benefits of a full-duplex radio. Cancellation of the self interference signal is realized through several techniques, categorized as passive suppression, digital cancellation, and analog cancellation. These methods all have their challenges in achieving the full amount of cancellation necessary and therefore all three techniques are typically employed in the system.In this thesis, a novel digitally assisted radio frequency (RF) analog self interference canceller is proposed to suppress the self interference signal before the receiver chain for wide modulation bandwidth signals. This canceller augments minimum complexity RFanalog interference cancellation hardware that uses an RF vector multiplier in combination with a flexible digital rational function finite impulse response filter. The simple topology reduces the number of impairments added to the system through the analog components and identifies the parameters of the proposed filter in a deterministic and single iteration algorithm.The hardware proof-of-concept prototype is built using off-the-shelf RF-analog components and demonstrates excellent cancellation performance. Using four TX test signals with modulation bandwidths of 20 MHz, 40 MHz, 80 MHz, and 120 MHz, the self interference canceller achieves a minimum of 50 dB, 47 dB, 42 dB, and 40 dB of cancellation respectively. This thesis reviews the previously proposed self interference cancellation topologies, system non-idealities that provide challenges for full-duplex implementation, and the realization of the proposed RF-analog self interference canceller.iii Acknowledgements I would like to thank my supervisor, Dr. Slim Boumaiza, for giving me guidance, advice, and confidence throughout my Masters process. He has taught me how to properly conduct research, approach problems and allowed me to pursue a topic that suited my interests. The entire Emerging Radio Systems Group (EmRG) consists of intelligent, kind and helpful members who I have also learned a lot from and enjoyed working with.I would also like to acknowledge my incredible family and friends who have offered continuous love and support throughout this lengthy Masters process.Finally, I would like to dedicate this thesis to my husband, Michael, for his love, patience, and calming influence while pushing ...

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Phase calibration for ideal wideband chirp in satellite-based synthetic aperture radar

2022

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Wideband Compensation of RF Vector Multiplier for RF Predistortion Systems

Cited by 13 publications

References 5 publications

Analogue predistortion lineariser control schemes for ultra‐broadband signal transmission in 5G transmitters

Analogue predistortion lineariser control schemes for ultra‐broadband signal transmission in 5G transmitters

Digitally Assisted RF-Analog Self Interference Cancellation for Wideband Full-Duplex Radios

Phase calibration for ideal wideband chirp in satellite-based synthetic aperture radar

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