Design of Dual-Band Multistandard Subsampling Receivers for Optimal SNDR in Nonlinear and Interfering Environments

Abstract

This paper presents a design approach to concurrent dual-band subsampling receivers for wireless certification and testing interoperability. The proposed technique allows the optimization of the signal-to-noise and distortion ratio and improves the subsampling receiver performance, usually limited by the clock jitter and folded thermal noise effects. Furthermore, the proposed design approach considers the presence of spurious nonlinear distortions and/or interferer's signals, which can alias over the desired signal bandwidth and reduce the valid subsampling frequency ranges. The proposed architecture allows seamless reconfigurability for simultaneous multistandard signal reception, reducing the costs in test equipment. As a validation of the proposed design methodology, a dual-band multiple clocking subsampling receiver operating in a nonlinear environment is developed, and an algorithm to find the optimal frequency plan is proposed and validated experimentally.

Concurrent Multiband Direct RF Sampling Receivers

“…The following stage of the RF front-end is a first stage of amplification. Equation (14) suggests that an ideal receiver would have high gain and low NF for all four in-band signals, but low gain or high rejection outside these bands. This points to the use of a concurrent, multiband, low noise amplifier (LNA), but such devices are yet to become widely available [40], [41].…”

“…The subband case achieves the most reduction in space and power consumption, whereas the Nyquist case offers the most flexibility and more reliable transmission. This approach has previously been implemented using subsampling ADCs to receive two signals simultaneously [14], [15]. [14] uses bandpass filters within the ADC to suppress intermodulation products, allowing concurrent reception of 5 MHz bandwidth signals at 2.12 GHz and 2.4 GHz with a 400 MSample/s sampling rate.…”

“…This approach has previously been implemented using subsampling ADCs to receive two signals simultaneously [14], [15]. [14] uses bandpass filters within the ADC to suppress intermodulation products, allowing concurrent reception of 5 MHz bandwidth signals at 2.12 GHz and 2.4 GHz with a 400 MSample/s sampling rate. [15] focuses on the design of a tunable multiband filter embedded within the ADC, enabling concurrent reception of two global navigation satellite system (GNSS) signals in the 1.2 GHz and 1.57 GHz bands.…”

Subsampling OFDM-Based Ultrasonic Data Communication Through Metallic Channels for Monitoring of Cargo Containers

“…Additionally, for a nonlinear environment, as the described ultrasonic metal channel, there are additional challenges to avoid aliasing between the different harmonics. For these scenarios, the selected sampling frequency has to meet this additional requirement [24]:…”

Analog‐to‐Digital Conversion for Cognitive Radio: Subsampling, Interleaving, and Compressive Sensing

“…As described in Section 2.3.5, applying the methods proposed in Ref. [15], it is possible to find the optimal band-pass filtering architecture, by searching the valid set of sampling frequencies in order to avoid aliasing with the interferers (Figure 14b), and also attending to requirements of folded noise reduction by using the principles of multiple clocking techniques (Section 2.2). Therefore, a similar scheme integrated in Figure 14a could minimize the number of branches, since the possibilities of aliasing in multi-band scenarios are reduced.…”