Decode and Forward Relay Technology for LTE-Advanced

Abstract

One of the main challenges faced by the developing standard for mobile broadband access isproviding high throughput at the cell edge. The transmitted signal from the base station to the mobile station directly is often degraded by random fades, noise and other propagation losses. This resulting in low SNR, and high packet error rate (PER). Therefore, users on the cell edge will face relatively low performance of the services offered to them.One solutionto improve coverage is to use the relay stations to transmit data between the Base Stations and the Mobile Stations or User Equipment through multi hop communication.

This work focus on Decode and Forward Relay which is can be used by wireless nodes to take the benefits of broadcast nature and to relay messages for each user. The ARQ mechanism that used as an efficient error control technique with DF relay introduces an ARQ feedback message made by the RS for fast and efficient data transmission. Simulation results show that transmission delay is reduced by 4.43% and throughput is enhanced by 66.1%. Above that the SNR is increased and PER is also decreased by about 22.9% and 95.1% respectively.