Multiple LDPC-Encoder Layered Space-Time-Frequency Architectures for OFDM MIMO Multiplexing

Abstract

This paper is focused on the study of layered space-time-frequency (LSTF) architectures with channel coding for orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) multiplexing systems for high speed wireless communications over a frequency-selective fading channel. In order to achieve the available spatial, temporal and frequency diversities, and also make the system implementation feasible for high speed OFDM MIMO multiplexing, a novel LSTF architecture with multiple channel encoders is proposed with each independently coded layer being threaded in the three-dimensional space-time-frequency transmission resource array. Non-iterative receiver is adopted which consists of list sphere detector and irregular low-density parity-check codes as the constituent codes. Simulation results show that the performance of the proposed multipleencoder LSTF architecture is very close to that of the conventional single-encoder LSTF where coding is applied across the whole information stream. However, due to the use of multiple parallel encoders/decoders with a shorter codeword length, the proposed LSTF architecture has much lower hardware processing speed and complexity than the conventional LSTF.

Low area FPGA Implementation of Secure MIMO OFDM based Wireless ECG Signal Transmission

“…The MIMO uses multiple antennas in both the transmitter and receiver to deliver high throughput and the throughput of MIMO is high when compared to the single input single output. Subsequently, the OFDM is combined with the MIMO, because of the flat fading feature obtained based on the narrowband sub-carrier signals [3]. Additionally, the OFDM is used to reduce multiuser and inter-carrier interference as well as it provides multi user channel access [4].…”