There are few studies considered uplink performance in Multi-hop LTE-networks. In LTE downlink switching scheme between multiplexing and diversity was discussed. In an adaptive MIMO detection algorithm for LTE-A system was proposed. In, the optimal RS placement problem for coverage extension in downlinks SISO LTE-A was discussed. In, the RS placement and the bandwidth allocation were jointly optimized to maximize the downlink capacity for SISO relay networks. LTE-A performance using relays have been considered in several studies. Channel capacity can be increased using Multi Input Multi Output (MIMO) in which multiple number of antennas are used at transmitter and receiving side creating Spatial Diversity and Multiplexing. Ĭellular networks with Single-Input-Single-Output (SISO) have small channel capacity. This will directly improve Cell Center Users (CCUs) performance and will improve total cell throughput, and capacity. This technique helps Cell Edge Users (CEUs) to utilize Resource Blocks (RBs) usage. So this paper will focus on the LTE-A Uplink performance to overcome this problem.Īdding Relay station in the cell is an efficient LTE-A uplink Performance improvement technique. This requires large uplink traffic to solve the two links bottleneck problem. However, in all 4G and all future networks this situation is changed, since popular file transfer and social network applications are supported. Most cellular networks research studies focus on downlink traffic scenarios, as most of wireless communications are a dominant traffic in downlink direction. LTE-Advanced offers better network performance than LTE Release 8. Simulation results show LTE-A uplink performance improvement using 2x4MIMO-AMC and SDMT scheme with RS at 50% of cell radius towards cell edge. Adaptive Modulation, and Coding (AMC) scheme with high order 2x4MIMO is used to maximize network throughput with low bit error rate (BER). This is done and measured as a function of different arrival rates of UEs assigned from random positions in the cell. The total LTE-A uplink Throughput, average throughput per user, and Mean File Transfer Time (MFTT) in the LTE-A network are considered as performance measures. Also the effect of adding RS to the network and its position will be discussed.
In this paper, LTE-A Uplink performance will be improved using Synchronous direct and multi-hop transmission (SDMT) between user equipment and Base Station. It can be used in IMT-Advanced technologies such as 3GPP LTE-Advanced. Multi-hop Relay networks are proposed to fulfill the demanding coverage and capacity requirements for current applications in a cost efficient way.
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