Low-Complexity Demodulation for Interleaved OFDMA Downlink System Using Circular Convolution

TL;DR

This paper introduces a low-complexity demodulation method for interleaved OFDMA downlink systems using circular convolution, reducing computational load while maintaining effective signal extraction.

Contribution

A novel demodulation scheme utilizing circular convolution in the time domain for interleaved OFDMA systems, significantly lowering computational complexity.

Findings

Computational complexity is substantially reduced compared to conventional methods.

Effective extraction of individual user signals from interleaved OFDMA signals.

The proposed scheme simplifies processing in multi-user OFDMA downlink systems.

Abstract

In this paper, a new low-complexity demodulation scheme is proposed for interleaved orthogonal frequency division multiple access (OFDMA) downlink system with N subcarriers and M users using circular convolution. In the proposed scheme, each user's signal is extracted from the received interleaved OFDMA signal of M users by using circular convolution in the time domain and then fast Fourier transformed in the reduced size N over M. It is shown that the computational complexity of the proposed scheme for the interleaved OFDMA downlink system is much less than that of the conventional one.