Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

Reducing Cubic Metric of Circularly Pulse-Shaped OFDM Signals Through Constellation Shaping Optimization With Performance Constraints

Yenming Huang, Rueibin Yang, Borching Su

TL;DR

A constellation shaping optimization method is proposed to further reduce the cubic metric (CM) of CPS-OFDM signals for the case that demands rather high power amplifier efficiency at the transmitter.

Abstract

Circularly pulse-shaped orthogonal frequency division multiplexing (CPS-OFDM) is one of the most promising 5G waveforms that addresses two physical layer signal requirements of low out-of-subband emission (OSBE) and low peak-to-average power ratio (PAPR) with flexibility in parameter adaptation. In this paper, a constellation shaping optimization method is proposed to further reduce the cubic metric (CM) of CPS-OFDM signals for the case that demands rather high power amplifier (PA) efficiency at the transmitter. Simulation results demonstrate the superiority of the proposed scheme in CM reduction, and the corresponding benefits of spectral regrowth mitigation and spectral efficiency improvement.

Reducing Cubic Metric of Circularly Pulse-Shaped OFDM Signals Through Constellation Shaping Optimization With Performance Constraints

TL;DR

A constellation shaping optimization method is proposed to further reduce the cubic metric (CM) of CPS-OFDM signals for the case that demands rather high power amplifier efficiency at the transmitter.

Abstract

Circularly pulse-shaped orthogonal frequency division multiplexing (CPS-OFDM) is one of the most promising 5G waveforms that addresses two physical layer signal requirements of low out-of-subband emission (OSBE) and low peak-to-average power ratio (PAPR) with flexibility in parameter adaptation. In this paper, a constellation shaping optimization method is proposed to further reduce the cubic metric (CM) of CPS-OFDM signals for the case that demands rather high power amplifier (PA) efficiency at the transmitter. Simulation results demonstrate the superiority of the proposed scheme in CM reduction, and the corresponding benefits of spectral regrowth mitigation and spectral efficiency improvement.

Paper Structure

This paper contains 12 sections, 27 equations, 4 figures.

Table of Contents

  1. Introduction
  2. System Model
  3. Cubic Metric (CM)
  4. Block-wise Error Vector Magnitude (EVM)
  5. Out-of-Subband Emission Energy (OSBEE)
  6. Offset Vector Design Problem
  7. Proposed Method
  8. Simulation Results
  9. Simulation Parameters and Assumptions
  10. Performance Evaluations
  11. Conclusion
  12. Derivation of OSBEE in Quadratic Form

Figures (4)

  • Figure 1: CPS-OFDM baseband transceiver system model with constellation shaping.
  • Figure 2: Scatterplots of the optimized offset data symbols in terms of different $\mathrm{EVM}_{\max}$ values for OFDM and CPS-OFDM.
  • Figure 3: The proposed optimal offset data vector design \ref{['ReformOptOffsetVecProblem']} can further reduce the RCM of CPS-OFDM signals to meet the requirement of high PA efficiency.
  • Figure 5: Uncoded 16-QAM BER results that the utilization of constellation shaping is accompanied with slight detection performance degradation.