OVERSAMPLED DISTORTION-AWARE PRECODING WITH EFFICIENT OOB RADIATION CONTROL FOR QUANTIZED MASSIVE MIMO AND PERFORMANCE ANALYSIS

Date

2023-8-25

Author

Karabacakoğlu, Yusuf

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In this study, the nonlinear effects of the quantization due to low-resolution digital-to-analog converters (DACs) will be investigated. Massive multiple-input multiple-output (MIMO) systems have received significant attention in academia and industry due to their remarkable advantages in terms of spectral and energy efficiency. However, the deployment of large number of antennas and circuitry required for generating transmit signals at the base station (BS) can be expensive and power-consuming. To address this, various studies in the literature proposes a practical solution by utilizing cheaper and power-efficient hardware, with a specific focus on the DACs used in the RF chain. By employing a pair of low-resolution DACs at each antenna of the massive MIMO array, both the cost and power consumption can be reduced, making it favorable for such systems. However, the use of low-resolution DACs introduces quantization distortion, which can severely affect system performance. To mitigate this distortion, various quantized precoding algorithms have been proposed in the literature. This study presents an iterative distortion-aware precoder that works with oversampling DACs, which have a sampling rate higher than the symbol rate, since oversampling is an effective approach for reducing quantization distortion in massive MIMO systems. We demonstrate that the precoder we propose outperforms the existing oversampling precoders of comparable computational complexity in the literature by efficiently maximizing the in-band error-rate performance while minimizing out-of-band emissions. Furthermore, we perform a performance analysis of the proposed precoder and quantized zero-forcing (ZF) precoder for various scenarios, including multiple base stations in adjacent channel bands and aliasing.

Subject Keywords

iterative precoder, quantization, 1-bit, massive MIMO, oversampling, upsampling, multi-bit, wideband, zero-forcing, frequency-selective channel, digital-to-analog converter (DAC)

URI

https://hdl.handle.net/11511/105362

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Graduate School of Natural and Applied Sciences, Thesis