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Multi-antenna transmitters based on Massive MIMO and beamforming will be one of the 5G enabler technologies. To have suitable commercial architectures for these transmitters, they must be scalable, cost-effective, energy efficient and present a high-level of integration. This paper presents a technique where the circulator (bulky and expensive) is no longer required in the architecture. This paper...
This paper provides an overview on recent advances on all-digital transceivers, as a promising approach to the ideal Software-Defined Radio concept. Several techniques and architectural optimizations are discussed to improve the coding efficiency, spectral purity, signal to noise ratio, bandwidth and flexibility.
Radio technology advances at good pace into higher frequencies and higher integration. This is especially notorious for new mixed-signal devices which concentrate entire radio-frequency (RF) chains with high frequency data-converters sub-systems.
The Centralized-Radio Access Networks (C-RAN) are one of the current trends for the next generation mobile standards. The main concept of C-RAN is the separation of the baseband processing and management tasks from the radio access units. This paper presents an all-digital, simple and flexible RF uplink section for a C-RAN Remote Radio Head (RRH). The implemented system presents an analog input bandwidth...
In this Ph.D. work it is intended to explore innovative agile and wideband FPGA-based Software Defined Radio (SDR) receiver architectures for future 5G wireless communications. This short paper presents some preliminary work in this area, including interesting results of an innovative SDR receiver. This new architecture implements the analog-to-digital conversion directly at RF stage based on Pulse...
All-digital radios allow the full digitalization of the radio system which poses an important step towards the complete software description of RF signals proposed in SDR. Using digital signal processing techniques and the integration of the radio into a single digital chip, it is expected that high flexibility in these systems will be fundamental for the next generation of wireless networks. In addition,...
In this paper an original agile and wideband all-digital Software Defined Radio (SDR) receiver is presented. The analog-to-digital conversion is based on Pulse Width Modulation (PWM) and it is performed directly at the Radio Frequency (RF) stage. The system is implemented using the high speed differential input buffers of a medium range Field Programmable Gate Array (FPGA) as comparators to quantize...
This demonstrator presents a novel framework for the characterization and modeling of mixed-signal systems. It will be shown that a joint analog and digital analysis is relevant for future radio-frequency (RF) components and devices. A characterization procedure suitable for mixed-signal systems is presented based on a National Instruments (NI) PXI architecture by analyzing the system in a scattering...
In this paper the feedback loop's impairments using radio-frequency (RF) analog-to-digital converters (ADCs) will be studied as a way to improve the digital predistortion (DPD) performance. Specifically, a compensation model for an RF ADC operating in under-sampling regime will be extracted, and applied in a DPD scenario. Significant improvements in the DPD performance will be presented and evaluated...
This paper presents a new design of a high capacity PtP microwave system based on SDR and spectrum aggregation techniques, suitable for 5G backhaul scenarios. The system supports data rates up to 4 Gbps with a high degree of agility and flexibility in the carrier frequency, modulation and bandwidth. It uses up to four carriers, occupying a bandwidth of about 480 MHz within 1 GHz IF spectrum. The architecture...
In this paper it will be shown a way to characterize RF Digital-to-Analog Converters (DACs) by means of Scattering Parameters. This allows an RF engineer, to understand which are the mismatches of a specific device relatively to its ideal behavior. Several measurement results will be presented for different DAC configurations and compared with ideal responses.
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