Precoding Design for Cyclic Prefix Overhead Reduction in a MISO-OFDM System

Kim, Namik; Ahn, Jinyoup; Shin, Oh‐Soon; Lee, Kwang Bok

doi:10.1109/lwc.2017.2718536

Cited by 4 publications

(1 citation statement)

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“…A method based on channel independent precoding with interference alignment was proposed in [5]. In [6], transmit precoding was applied to reduce the RMS delay spread of the channel. Moreover, characterization and mitigation of ISI with either precoding or equalization is also an important aspect of baseband Discrete Multitone (DMT) systems [7].…”

Section: Introductionmentioning

confidence: 99%

Frequency-Domain Modeling of OFDM Transmission with Insufficient Cyclic Prefix Using Toeplitz Matrices

Cisek

Zieliński

2018

2018 IEEE 88th Vehicular Technology Conference (VTC-Fall)

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A novel mathematical framework is proposed to model Intersymbol Interference (ISI) phenomenon in wireless communication systems based on Orthogonal Frequency Division Multiplexing (OFDM) with or without cyclic prefix. The framework is based on a new formula to calculate the Fast Fourier Transform (FFT) of a triangular Toeplitz matrix, which is derived and proven in this paper. It is shown that distortion inducted by the ISI from a given subcarrier is the most significant for the closest subcarriers and the contribution decays as the distance between subcarriers grows. According to numerical experiments, knowledge of ISI coefficients concentrated around the diagonal of Channel Frequency Response (CFR) matrix improves the receiver's error floor significantly. The potential use of the framework for real-time frequency domain channel simulation was also investigated and demonstrated to be more efficient than conventional time domain Tapped Delay Line (TDL) model when a number of simulated users is high.

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Section: Introductionmentioning

confidence: 99%