Direct Carrier Six-Port Modulator Using a Technique to Suppress Carrier Leakage

Osth, Joakim; Owais,; Karlsson, Magnus; Serban, Adriana; Gong, Shaofang; Karlsson, Peter

doi:10.1109/tmtt.2011.2104972

Cited by 38 publications

(20 citation statements)

References 16 publications

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“…It gives some additional insight into the performance of the system. If a tilde (~) is used to describe measured I(Q) signals and no tilde for the ideal I(Q) signals, both normalized to unit power, the root mean square (RMS) EVM can be calculated according to (6).…”

Section: B Evmmentioning

confidence: 99%

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Performance evaluation of six-port receivers with simplified interface to amplifier and filter

Osth

Owais

Karlsson

et al. 2011

2011 IEEE International Conference on Ultra-Wideband (ICUWB)

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The performance of two different six-port demodulator prototypes for the UWB band 6 to 8.5 GHz are presented. Both configurations allow for a simplified interface to amplifier and filter. In addition, one of the configurations also have oddorder harmonic suppression. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 100 Msymbols/s is demodulated for both prototypes. The performance of the two prototypes are compared in terms of error vector magnitude, bit error rate, sensitivity and dynamic range.

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Section: B Evmmentioning

confidence: 99%

“…The sixport correlator, together with variable loads, can also be used for modulation to generate a radio frequency (RF) signal, including both I and Q data [6]- [8]. In our previous work, two new diode configurations that allows for a simplified interface to amplifier and filter were presented [3].…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of six-port receivers with simplified interface to amplifier and filter

Osth

Owais

Karlsson

et al. 2011

2011 IEEE International Conference on Ultra-Wideband (ICUWB)

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“…For instance, in [7], a voltage controlled resistance was built using a Schottky diode in forward bias. Because the device has a single degree of freedom, its value is restricted to a line in the complex plane of the reflection coefficient.…”

Section: Introductionmentioning

confidence: 99%

New Design of a Variable Impedance Based on Polarized Diodes at Microwave Frequency

Venere

Hurtado

Valle

et al. 2017

IEEE Microw. Wireless Compon. Lett.

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Abstract-In this letter, we present a new variable impedance termination consisting of two polarized diodes. To generate a complex-valued impedance, two controlled current sources polarize the diodes, which are interconnected with a Wilkinson power divider through transmission lines of different electric lengths. Because of the reduced number of diodes, this structure presents low power consumption and simple control. We validated the proposed design by implementing a prototype at the operating frequency of 1575.42 MHz. Mapping the measured results in the Smith chart, the impedance can produce reflection coefficients with full-phase coverage within the circle of magnitude 0.35 over a frequency range of 1.5-1.6 GHz.Index Terms-One-port impedance termination, p-i-n diode, programmable load, variable impedance.

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“…The variable impedance loads are used to generate different reflection coefficients on the respective ports of the six-port correlator, which in turn modulates an applied carrier signal [5], [8], [9], [18], [19]. The variable load can, for example, be implemented with transistors [10], [11], [18], [20], switches [5], [9] or diodes [12], [13]. As stated by Shannon and Nyquist, the key factors of communication are bandwidth, number of signal levels, and signal-to-noise ratio [15].…”

Section: Introductionmentioning

confidence: 99%

“…As stated by Shannon and Nyquist, the key factors of communication are bandwidth, number of signal levels, and signal-to-noise ratio [15]. The six-port technology has potential in communication systems due to its strength in all the three key factors [13]. However, a real system ought to be affected by various non-idealities, e.g., carrier leakage may occur when using variable loads together with a sixport correlator for modulation [8], [11].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Single-Ended vs. Differential Six-Port Modulators for Wireless Communications

Osth

Karlsson

Serban

et al. 2015

IEEE Trans. Circuits Syst. I

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If present, nonlinear effects in a six-port modulator cause distortion and degradation of the quality of the modulated output waveform. How nonlinear effects occur and their impact on system performance were derived in a mathematical model. The model shows that non-ideal performance of the passive sixport correlator is the main contributor to nonlinear distortion. Simulations and measurements on two manufactured six-port modulators were used to validate the theory and to give deeper insight on system performance. It is shown that by using a differentially signaled six-port modulator instead of a singleended six-port modulator, better performance is achieved over a wide bandwidth. For an error vector magnitude of less than 10%, the relative bandwidth was measured to 12% for the single-ended but 30% for the differentially signaled modulator.

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Direct Carrier Six-Port Modulator Using a Technique to Suppress Carrier Leakage

Cited by 38 publications

References 16 publications

Performance evaluation of six-port receivers with simplified interface to amplifier and filter

Performance evaluation of six-port receivers with simplified interface to amplifier and filter

New Design of a Variable Impedance Based on Polarized Diodes at Microwave Frequency

A Comparative Study of Single-Ended vs. Differential Six-Port Modulators for Wireless Communications

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