Hybrid Group Decoding for Scalable Video over MIMO-OFDM Downlink Systems

TL;DR

This paper introduces a scalable video broadcasting scheme over MIMO-OFDM systems using a hybrid group decoding approach, improving performance by adaptively switching between decoding methods based on rate feedback.

Contribution

It proposes a novel hybrid receiver that combines successive group decoding and MMSE decoding, enhancing scalability and efficiency in MIMO-OFDM video broadcasting.

Findings

Significant performance gains over conventional MMSE decoding.

Effective adaptive decoding based on rate feedback.

Improved scalability for video transmission in MIMO-OFDM systems.

Abstract

We propose a scalable video broadcasting scheme over MIMO-OFDM systems. The scalable video source layers are channel encoded and modulated into independent signal streams, which are then transmitted from the allocated antennas in certain time-frequency blocks. Each receiver employs the successive group decoder to decode the signal streams of interest by treating other signal streams as interference. The transmitter performs adaptive coding and modulation, and transmission antenna and subcarrier allocation, based on the rate feedback from the receivers. We also propose a hybrid receiver that switches between the successive group decoder and the MMSE decoder depending on the rate. Extensive simulations are provided to demonstrate the performance gain of the proposed group-decoding-based scalable video broadcasting scheme over the one based on the conventional MMSE decoding.