Method for Phase Noise Impact Compensation in 60 GHz OFDM Receivers

Abstract

This paper presents a method for phase noise impact compensation in 60 GHz OFDM receivers and provides the results of performance evaluation using OFDM PHY parameters defined in the IEEE 802.11ay standard. It is shown that the phase noise in 60 GHz band has a critical impact on the OFDM performance for high data rate transmission employing high order modulation constellations. The proposed compensation method combines time domain algorithm predicting the linear average phase trend on the OFDM symbol duration and estimation in frequency domain of phase noise spectrum realization and convolution with correction filter response. Both algorithms use Maximum A Posteriori Probability (MAP) estimation approach to find the optimal solution and are applied successively. The proposed algorithms have moderate implementation complexity which is especially important for high speed 11ay hardware modem architecture. The performance of the proposed algorithms is evaluated in the frequency flat and frequency selective channels with phase noise model adopted in the IEEE 802.11ay.

26‐GHz Testbed performance evaluation using system EVM characterization for 5G communication

“…Several authors have proposed solutions for PN compensation in mmW transmission. [12][13][14] Lomayev et al, 12 for example, have introduced two algorithms that use the maximum likelihood estimation approach to reduce the impact of PN in 60-GHz OFDM receivers, because PN in the 60-GHz band has a critical impact on OFDM performance for high-speed data transmission using high-order modulation constellations. The performance of proposed algorithms is evaluated in flat-frequency and frequency-selective channels with the PN model adopted in IEEE 802.11ay.…”

“…Indeed, the PN caused by a non‐ideal oscillator induces ICI (intercarrier interference), which is problematic for the operation of high‐order modulations. Several authors have proposed solutions for PN compensation in mmW transmission 12–14 . Lomayev et al, 12 for example, have introduced two algorithms that use the maximum likelihood estimation approach to reduce the impact of PN in 60‐GHz OFDM receivers, because PN in the 60‐GHz band has a critical impact on OFDM performance for high‐speed data transmission using high‐order modulation constellations.…”

Phase Tracking Sequences for 5G NR in 52.6-71 GHz Band: Design and Analysis

“…Phase noise impact on the OFDM signals Analysis of the phase noise influence on an OFDM system performed in a number of works [4][5] [6] show that the overall phase noise impact can be divided in the two components -the CPE, and the ICI -see Eq. ( 1), in details derived in [11]. The first term ‫ܬ‬ ̅ is common for all subcarriers on the given OFDM symbol, but largely fluctuating for different symbols.…”

“…For the frequency selective channel, the transmit noise is affected by the channel transfer function and thus, may not be described by simple convolution. Fortunately, as shown in [11], the representation of the phase noise impact as convolution in the frequency domain for the case of frequency-selective channels is applicable inside the channel coherence bandwidth, which is typically much larger than phase noise bandwidth, and thus representation (1) can be freely applied for the description of the phase noise impact on the 5G NR communication system in the considered channels with the delay spread up to tens of nanoseconds. Moreover, the PN spectrum realization has specific symmetry, where the Ji and J -i tones taken at the symmetric positions around the DC component J 0 have equal imaginary parts and real parts with equal magnitudes, but inverted signs [11].…”