downlink
RSS downlinkAn OFDM Based System Proposal for 4g Downlinks
White Paper This paper describes an OFDM based 4G downlink for a wide area coverage and high mobility system. User data are multiplexed and OFDM modulated such that the user with the best predicted channel conditions are always... [14 Apr 2007]
OFDM and DS-CDMA Approaches, Analysis of Performances on Fading Multipath Channels
White Paper Parameters of simulations, presented in this paper, correspond typically to an UMTS downlink transmission. This paper shows how orthogonality constraints for DSCDMA spreading sequences yield directly to OFDM sequences. [14 Apr 2007]
Downlink Scheduling and Resource Allocation for OFDM Systems
White Paper This paper considers scheduling and resource allocation for the downlink of a OFDM-based wireless network. During each time-slot the scheduling and resource allocation problem involves selecting a subset of users for... [13 Apr 2007]
Optimal Scheduling for OFDMA Systems
White Paper This paper considers a scheduling and resource allocation problem for the downlink of an OFDMA-based wireless network, where the channel estimation error is modeled by a self-noise term in the decoding process. [13 Apr 2007]
A Scalable Multiuser Framework for Video Over OFDM Networks: Fairness and Efficiency
White Paper This paper proposes a framework to transmit multiple scalable video programs over downlink multiuser OFDM networks in real time. The framework explores the scalability of the video codec and multi-dimensional diversity... [13 Apr 2007]
Performance Analysis of a Reuse Partitioning Technique for OFDM Based Evolved UTRA
White Paper The current 3GPP working assumption on the Evolved Universal Terrestrial Radio Access (E-UTRA) physical layer is that it will be based on Single Carrier Frequency Division Multiple Access (SC-FDMA) for the uplink and Orthogonal Frequency... [13 Apr 2007]
Use of Cognitive Radio Techniques for OFDM Ultrawideband Coexistence With WiMax
White Paper A multiband OFDM receiver can operate as a channelized radiometer to detect emissions from WiMax systems, either in the uplink or downlink channel. This paper explores the issues in coexistence between Broadband Fixed... [13 Apr 2007]
An Opportunistic Downlink MIMO-OFDM Scheme
White Paper This paper presents an opportunistic Multiple-Input Multiple-Output (MIMO) scheme that achieves increased throughput of multi-user downlink transmission in frequency-selective channels. Developed for OFDM systems, the... [11 Apr 2007]
Fast Broadcasting
White Paper Broadcast transmission, as proposed by Cover, is an optimal downlink transmission method to serve many users by a single base station. Substituting or complementing the fast scheduler in high speed... [11 Apr 2007]
Linear Precoding for Multiuser MIMO-OFDM Systems
White Paper This paper develops linear precoding schemes for the downlink in multiuser Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems with multiple data streams per user. [11 Apr 2007]
Joint Allocation of Subcarriers and Transmit Powers in a Multiuser OFDM Cellular Network
White Paper This paper considers the problem of joint bandwidth (subcarriers) and power allocation for the downlink of a multi-user multi-cell OFDM cellular network. This resource allocation problem is formulated as a power... [11 Apr 2007]
Spatial Multiplexing for Outdoor MIMO-OFDM Systems With Limited Feedback Constraint
White Paper This paper proposes a spatial multiplexing technique for the downlink of a Multiple-Input-Multiple-Output (MIMO) Orthogonal-Frequency-Division-Multiplexing (OFDM) system. For outdoor environments with a limited angular... [11 Apr 2007]
Adaptive Subcarrier and Power Allocation in OFDM Based on Maximizing Utility
White Paper This paper investigates adaptive resource allocation on the downlink of multiuser OFDM networks to achieve both multiuser diversity and fairness. Utility functions are applied to quantify the level of users' satisfaction... [11 Apr 2007]
Performance Degradation of OFDM and MC-CDMA to Carrier Phase Jitter
White Paper Assuming a multicarrier downlink through an AWGN channel, this paper investigates the impact of jitter phase models on the SNR degradation. This paper analyses the effect of carrier phase jitter on the performance of... [11 Apr 2007]
Cross-Layer Optimization of OFDM Transmission Systems for MPEG-4 Video Streaming
White Paper This paper studies the performance of a combined link- and physical-layer approach for the downlink of a dynamic OFDM-FDMA transmission system delivering MPEG-4 video streams. The approach consists of three different... [11 Apr 2007]
