Novel IQ Imbalance Estimation for Wideband MIMO OFDM Systems with CFO

Sandell, Magnus; Tsimbalo, Evgeny; Jardak, Seifallah; Uchida, Daisuke; Akita, Koji; Yoda, Daiki; Kawaguchi, Takeshi; Sano, Masahiko

doi:10.1109/globecom38437.2019.9014138

Cited by 3 publications

(3 citation statements)

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“…Next, the proposed WL MIMO equalizer is modified for digital SC multiplexing. For a PM digital SC signal, the WL MIMO equalizer is applied to each pair of an SC and the conjugate SC [9][10][11]. Accordingly, a 16×4 WL MIMO equalizer is used for the two SC signals with both polarizations; e.g., four SCs use two sets of 16×4 WL MIMO equalizers.…”

Section: Wl Mimo Equalizer With Independent Complex Filtering On Iq S...mentioning

confidence: 99%

“…As the symbol rate increases, the signal-quality impact of linear impairments such as various IQ imbalances, either frequency dependent or independent, becomes more significant in proportion to the modulation order. Accordingly, several transceiver impairment mitigation techniques featuring digital signal processing (DSP) have been proposed, for both factory calibration [2] and adaptive equalization at the coherent receiver [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…As with the complex 4×2 MIMO equalizer [3], the combination of independent CDC and a complex MIMO equalizer enables Rx impairment mitigation, while embedded carrier frequency offset (FO) compensation enables Tx impairment mitigation. In a similar vein, a joint FO and Tx/Rx IQ imbalance compensation scheme has been proposed for wireless MIMO orthogonal frequency-division multiplexing (OFDM) systems [9]. To compensate for transceiver impairments, however, the equalizer must take the carrier phase error into account, not just the FO.…”

Section: Introductionmentioning

confidence: 99%

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Transceiver Impairment Mitigation by 8×2 Widely Linear MIMO Equalizer With Independent Complex Filtering on IQ Signals

et al. 2022

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High-order modulation formats with high symbol rates are promising candidates for meeting the growing traffic requirements of digital coherent transmission. In using these modulation formats, the impact of transceiver impairment on the signal quality becomes significant. In this paper, we propose an 8×2 widely linear (WL) multiple-input multiple-output (MIMO) equalizer with independent complex filtering on IQ signals to mitigate linear transceiver impairments. Furthermore, we extend the equalizer for digital subcarrier (SC) multiplexing. Accordingly, a 16×4 WL MIMO equalizer is also proposed to mitigate linear transceiver impairments, through application to a pair of SC inputs. Experimental results show that, for transmission of a 58-GBaud polarization-multiplexing 64 quadrature amplitude modulation (PM-64QAM) single-carrier signal, the proposed method effectively compensates for various receiver impairments and also mitigates transmitter (Tx) impairments. Q-penalties of 0.1 dB up to a 10-ps skew, 2.5-dB gain imbalance, 7.2-degree phase error, and -15-dB crosstalk in Tx were achieved for 100-km standard single-mode fiber transmission. Moreover, for a 29-GBaud PM-64QAM dual-SC signal, the proposed 16×4 WL MIMO equalizer shows transceiver impairment mitigation performance similar to that in the singlecarrier case, even though dual-SC transmission is less tolerant of laser phase noise.

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Section: Wl Mimo Equalizer With Independent Complex Filtering On Iq S...mentioning

confidence: 99%