In this paper,a simple adaptive power dividing function for the design of a dual-input Doherty power amplifier(DPA)is presented.In the presented approaches,the signal separation function(SSF)at different frequency poi...In this paper,a simple adaptive power dividing function for the design of a dual-input Doherty power amplifier(DPA)is presented.In the presented approaches,the signal separation function(SSF)at different frequency points can be characterized by a polynomial.And in the practical test,the coefficients of SSF can be determined by measuring a small number of data points of input power.Same as other dualinput DPAs,the proposed approach can also achieve high output power and back-off efficiency in a broadband operation band by adjusting the power distribution ratio flexibly.Finally,a 1.5-2.5 GHz highefficiency dual-input Doherty power amplifier is implemented according to this approach.The test results show that the peak power is 48.6-49.7d Bm,and the 6-d B back-off efficiency is 51.0-67.0%,and the saturation efficiency is 52.4-74.6%.The digital predistortion correction is carried out at the frequency points of 1.8/2.1GHz,and the adjacent channel power ratio is lower than-54.5d Bc.Simulation and experiment results can verify the effectiveness and correctness of the proposed method.展开更多
The basic theory of the sequential load-modulated balanced amplifier(SLMBA)is introduced and the working principle of its active load modulation is analyzed in this paper.In order to further improve the performance of...The basic theory of the sequential load-modulated balanced amplifier(SLMBA)is introduced and the working principle of its active load modulation is analyzed in this paper.In order to further improve the performance of the SLMBA,a codesigned method of the coupler and power amplifier(PA)is proposed,which is different from the traditional design of couplers.According to the back-off point and saturation point of the SLMBA,this coupler-PA codesign approach can make the working state of the coupler and three-way PA closer to the actual situation,which improves the overall performance of the SLMBA.The maximum output power ratio of the control PA and the balance PA is then determined by the preset output power back-off(OBO)of 10 dB,and the phase compensation line is determined by the trace of the load modulation impedance of the balanced PA.In order to verify the proposed method,an SLMBA operating at 1.5–2.7 GHz(57%relative bandwidth)is designed.The layout simulation results show that its saturated output powers achieve 40.7–43.7 dBm and the small signal gains are 9.7–12.4 dB.Besides,the drain efficiencies at the saturated point and 10 dB OBO point are 52.7%–73.7%and 44.9%–59.2%respectively.展开更多
SM4 is a block cipher algorithm among Chinese commer-cial cryptographic algorithms,which is advanced in terms of efficiency and theoretical security and has become national and international stan-dards successively.Howe...SM4 is a block cipher algorithm among Chinese commer-cial cryptographic algorithms,which is advanced in terms of efficiency and theoretical security and has become national and international stan-dards successively.However,existing literature shows that SM4 was not designed with an emphasis on key storage,which means that in today’s world where a single trusted hardware device with the built-in key faces challenges such as vulnerability,high cost,and unreliability,the usabil-ity of SM4 may be limited.Therefore,this paper proposes an imple-mentation scheme for SM4 based on secure multi-party computation(MPC)technology.The scheme involves dispensing the key among mul-tiple users’devices in a distributed manner,and when using the SM4 algorithm for encryption,multiple users perform joint computation with-out opening the full key.Specifically,this paper employs the MP-SPDZ framework,which satisfies security requirements in the presence of a dishonest majority of active adversaries.In view of the fact that this framework can only perform basic linear operations such as addition and multiplication,this paper focuses on the algebraic analysis of Sbox,which is the only non-linear component in SM4,and reconstructs it using the bit decomposition method.Furthermore,this paper demonstrates the conversion between the SM4-Sboxfield GF(28)and the SPDZ parame-terfield GF(240)through the isomorphic mapping,making it possible to perform joint calculations throughout the entire SM4 algorithm.Com-plexity analysis shows that this scheme has advantages in terms of data storage and communication volume,reaching a level of usability.展开更多
基金supported by National Natural Science Foundation of China(No.62001061)。
文摘In this paper,a simple adaptive power dividing function for the design of a dual-input Doherty power amplifier(DPA)is presented.In the presented approaches,the signal separation function(SSF)at different frequency points can be characterized by a polynomial.And in the practical test,the coefficients of SSF can be determined by measuring a small number of data points of input power.Same as other dualinput DPAs,the proposed approach can also achieve high output power and back-off efficiency in a broadband operation band by adjusting the power distribution ratio flexibly.Finally,a 1.5-2.5 GHz highefficiency dual-input Doherty power amplifier is implemented according to this approach.The test results show that the peak power is 48.6-49.7d Bm,and the 6-d B back-off efficiency is 51.0-67.0%,and the saturation efficiency is 52.4-74.6%.The digital predistortion correction is carried out at the frequency points of 1.8/2.1GHz,and the adjacent channel power ratio is lower than-54.5d Bc.Simulation and experiment results can verify the effectiveness and correctness of the proposed method.
基金supported in part by the National Natural Science Foundation of China under Grant Nos. 62001061, 62171068 and 62171065ZTE Industry-University-Institute Cooperation Funds under Grant No. HC-CN-20210520005
文摘The basic theory of the sequential load-modulated balanced amplifier(SLMBA)is introduced and the working principle of its active load modulation is analyzed in this paper.In order to further improve the performance of the SLMBA,a codesigned method of the coupler and power amplifier(PA)is proposed,which is different from the traditional design of couplers.According to the back-off point and saturation point of the SLMBA,this coupler-PA codesign approach can make the working state of the coupler and three-way PA closer to the actual situation,which improves the overall performance of the SLMBA.The maximum output power ratio of the control PA and the balance PA is then determined by the preset output power back-off(OBO)of 10 dB,and the phase compensation line is determined by the trace of the load modulation impedance of the balanced PA.In order to verify the proposed method,an SLMBA operating at 1.5–2.7 GHz(57%relative bandwidth)is designed.The layout simulation results show that its saturated output powers achieve 40.7–43.7 dBm and the small signal gains are 9.7–12.4 dB.Besides,the drain efficiencies at the saturated point and 10 dB OBO point are 52.7%–73.7%and 44.9%–59.2%respectively.
基金Supported by the National Natural Science Foundation of China under Grant No.61907042Beijing Natural Science Foundation under Grant No.4194090.
文摘SM4 is a block cipher algorithm among Chinese commer-cial cryptographic algorithms,which is advanced in terms of efficiency and theoretical security and has become national and international stan-dards successively.However,existing literature shows that SM4 was not designed with an emphasis on key storage,which means that in today’s world where a single trusted hardware device with the built-in key faces challenges such as vulnerability,high cost,and unreliability,the usabil-ity of SM4 may be limited.Therefore,this paper proposes an imple-mentation scheme for SM4 based on secure multi-party computation(MPC)technology.The scheme involves dispensing the key among mul-tiple users’devices in a distributed manner,and when using the SM4 algorithm for encryption,multiple users perform joint computation with-out opening the full key.Specifically,this paper employs the MP-SPDZ framework,which satisfies security requirements in the presence of a dishonest majority of active adversaries.In view of the fact that this framework can only perform basic linear operations such as addition and multiplication,this paper focuses on the algebraic analysis of Sbox,which is the only non-linear component in SM4,and reconstructs it using the bit decomposition method.Furthermore,this paper demonstrates the conversion between the SM4-Sboxfield GF(28)and the SPDZ parame-terfield GF(240)through the isomorphic mapping,making it possible to perform joint calculations throughout the entire SM4 algorithm.Com-plexity analysis shows that this scheme has advantages in terms of data storage and communication volume,reaching a level of usability.
