System Packet Error Rate Research Articles

Joint Power Management and Adaptive Modulation and Coding for Wireless Communications Systems With Unreliable Buffering Memories

To guard against process variability in advanced semiconductor nodes, especially for high-density memories, designers resort to overdesigning policies resulting in increased power consumption. A promising approach to save power is to utilize Voltage over-Scaling (VoS). However VoS results into unreliable buffering memories where a predictable statistically amount of errors are introduced to memories. The goal is to trade off channel dependent SNR slack versus hardware induced errors, to achieve predetermined quality metrics, at reduced power consumption. By design, modern communication systems attempt to minimize channel-dependent SNR slack via adaptive modulation and coding (AMC) schemes, thus reducing the gains of on-chip power management. This paper investigates the interaction between on-chip power management via VoS on embedded memories versus network based AMC techniques. A novel mathematical approach that analytically describes the system packet error rate (PER) performance under the VoS induced noise is presented. Based on this model, different AMC and power management algorithms are presented that utilize the received SNR estimates to find the best AMC mode and memory voltage that achieves performance goals at reduced power consumption. Simulation results show that the proposed algorithms can achieve up to 58% energy efficiency for the memory-subsystems compared to conventional AMC algorithm with perfect memories. © 2014 IEEE.

V2V Communication Quality: Measurements in a Cooperative Automotive Platooning Application

This paper presents measurements on Vehicle to Vehicle (V2V) communication between participants in a platooning application. Platooning, according to the SARTRE concept, implies several vehicles travelling together in tight formation, with a manually driven heavy lead vehicle. The platoon being studied consists of five vehicles; two trucks in the lead and three passenger cars. The V2V-communication node in each vehicle contains an 802.11p radio at 5,9 GHz. It is used to send messages between vehicles to coordinate movements and maintain safety in the platoon. Another cooperative application that relies on V2V-communication is multiple UAVs flying in formation; as investigated in KARYON. This project also investigates cooperative autonomous vehicles. In both applications, V2V-communication is an enabling technology. Two metrics are studied to quantify the V2V-communication quality: system packet error rate and consecutive packet loss. These two metrics characterize the communication quality in the different tests (speed, antenna position and two tracks). The paper draws general conclusions on the performance of V2V-communication. The presented test results supports comparison of the tested antenna placements on the trucks and the communication quality related to speed and track.

Adjacent Channel Interference Reduction for M-WiMAX TDD and WCDMA FDD Coexistence by Utilizing Beamforming in M-WiMAX TDD System

In this paper, we analyze the coexistence issues of M-WiMAX TDD and WCDMA FDD systems. Smart antenna techniques are applied to mitigate the performance loss induced by adjacent channel interference (ACI) in the scenarios where performance is heavily degraded. In addition, an ACI model is proposed to capture the effect of transmit beamforming at the M-WiMAX base station. Furthermore, a MCS-based throughput analysis is proposed, to jointly consider the effects of ACI, system packet error rate requirement, and the available modulation and coding schemes, which is not possible by using the conventional Shannon equation based analysis. From the results, we find that the proposed MCS-based analysis method is quite suitable to analyze the system theoretical throughput in a practical manner.

A Low-Complexity Synchronizer for OFDM-Based UWB System

In current ultra-wideband (UWB) baseband synchronizer approaches, the parallel architecture is used to achieve over 500 MSamples/s throughput requirement. Therefore achieving low power and less area becomes the challenge of UWB baseband design. In this paper, a low-complexity synchronizer combining data-partition-based correlation algorithms and dynamic-threshold design is proposed for orthogonal frequency division multiplexing based UWB system. It provides a methodology to reduce design complexity with an acceptable performance loss. Based on the data-partition algorithms, both single auto-correlator and moving-average-free matched filter are developed with 528 Msample/s throughput for the 480 Mb/s UWB design. Simulation results show the synchronization loss can be limited to 0.8-dB signal-to-noise ratio for 8% system packet-error rate