Non-linear distortion noise cancellation for satellite return links

Abstract

In this paper, an iterative receiver that performs non-linear distortion noise cancellation is presented. The performance is assessed for time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single-carrier frequency division multiple access (SC-FDMA) waveforms for application over the satellite return link channel. The performance is assessed in terms of energy efficiency and spectral efficiency, where the total degradation (TD) of the received signal-to-noise ratio (SNR) is minimized. The modulation formats of the DVB-RCS2 satellite return link standard and a respective non-linear channel have been used. Two iterations of non-linear noise cancellation across the different modulation orders have shown the following total degradation gains: 1.1−2.5 dB in OFDMA, 0.3−1.1 dB in SC-FDMA, 0.1−0.8 dB in TDMA with 20% roll-off, and 0.2 − 1.9 dB in TDMA with 5% roll-off.

Filter bank‐based multiple access in next‐generation satellite uplinks: A DVB‐RCS2‐based experimental study

“…Similarly, one can write the SE for (SC‐)FBMA as follows: where the assumption of a transmission frame long enough to have negligible filter overhead (prototype filter tails) has been made. Figure depicts the SEs for three constellation‐coding cases (taken from the DVB‐S2(X) recommendations) versus the so‐called normalized energy requirement, defined as the sum of the minimum SNR required for a coded BER of in the linear AWGN channel and the corresponding minimum TD …”

“…In Deepak and Ali, the idea of Yuen et al was detailed, this time with CFO included, whose compensation was addressed in Deepak and Ali . In Valette et al, the good spectral confinement of FBMC is exploited to add spectral shaping (exploiting the excess bandwidth) in order to reduce PAPR (since low PAPR and steep cutoff are conflicting requirements).…”

“…Although DVB‐RCS2 adopts a Multi‐Frequency Time Division Multiple Access (MF‐TDMA) scheme, it also recognizes the potential gains from an evolution to a SC‐FDMA‐based UL . Potential gains (eg, in power and spectral efficiency) of SC‐FDMA over SC‐TDMA and OFDMA have been also demonstrated in previous studies and SC‐FDMA has shown promise to significantly improve upon the existing 4K/8K broadcasting standard . The results of Dimitrov et al et al suggest that SC‐FDMA is preferable to TDMA and OFDMA for the UL and that FBMC is appealing in view of its advantages in dealing with asynchronous access and flexible spectrum allocation, hence indirectly pointing to SC‐FBMA as a promising solution for SatCom UL.…”

Estimation and cancellation of transponder distortions in satellite forward links using memory polynomials

“…In previous work, [13][14][15]18 known measured models for the distortion sources in the transmission chain have been used for estimation and cancellation of the non-linear distortion noise. These include the linear and non-linear distortions in the satellite transponder due to the IMUX filter, the TWTA, and the OMUX filter.…”

“…In addition to non-linear compensation, memory effects in the form of ISI are also mitigated, since the reconstruction and cancellation of the interfering component are performed on a large block of symbols, eg, a PL frame. This iterative nonlinear equalizer has been shown to be an effective technique to compensate the non-linear distortions in the satellite channel and to significantly reduce the SNR penalty with respect to the linear channel [13][14][15]18.…”