techniques ofdm
RSS techniques ofdmCompress-and-Forward Cooperative Relaying in MIMO-OFDM Systems
White Paper In the evaluation it considers MIMO-OFDM transmission. This paper extends this Wyner-Ziv bound to MIMO-OFDM, by applying results from Bayesian vector estimation and rate-distortion coding theory. Finally, the paper illustrates by simulations (in an... [11 Apr 2008]
UWB Coexistence and Cognitive Radio: How Multiband-OFDM Leads the Way
White Paper Building on the IEEE 802.15.2 Recommended Practice and the framework developed by IEEE 802.19, researchers are developing techniques to separate UWB signals for others using time, frequency, power, space, and coding, the five techniques available... [11 Apr 2008]
Spatial Multiplexing and Diversity Gain in OFDM-Based MIMO Systems
White Paper This paper investigates trade offs between different techniques in broadband OFDM-based MIMO systems for achieving full diversity or maximum spatial multiplexing gain. The basic model of OFDM-based spatial multiplexer is very suitable for high data... [10 Apr 2008]
A Study of Channel Estimation in OFDM Systems
White Paper The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and... [10 Apr 2008]
Long Range Channel Prediction for Adaptive OFDM Systems
White Paper In this paper, different techniques for long-range channel prediction for OFDM systems are investigated. Frequency domain channel prediction on each OFDM subchannel is first explored, and it is shown that the optimum prediction filter depends only... [10 Apr 2008]
Practical Approaches to Channel Estimation and Interference Suppression for OFDM Based UWB Communications
White Paper Computer simulation results show that these techniques can be effectively used in OFDM based UWB systems for performance improvement. This paper investigates low complexity signal detection approaches for OFDM based UWB systems. [10 Apr 2008]
OFDM Code-Division Multiplexing With Pre-Equalization for Mobile Communications
White Paper Different pre-equalization techniques are investigated, and it is shown that pre-equalized OFDM-CDM systems can achieve promising performance in fading channels. In this paper, the potential of orthogonal frequency-division multiplexing-code... [10 Apr 2008]
Real Time Implementation on FPGA of an OFDM Based Wireless LAN Modem Extended With Adaptive Loading
White Paper For wireless Local Area Network (LAN) the standards have chosen orthogonal frequency division multiplex (OFDM) as modulation scheme. This paper presents the implementation aspects of an OFDM based wireless LAN modem together with adaptive loading... [10 Apr 2008]
On the Baseband Compensation of IQ Imbalances in OFDM Systems
White Paper OFDM is a widely recognized and standardized modulation scheme for future high bit rate communications. Implementation of OFDM-based systems suffers from Inphase-Quadrature phase (IQ) imbalances in the front-end analog processing. [10 Apr 2008]
Robust Timing Synchronization for OFDM Based Wireless LAN System
White Paper The proposed method does frame detection using a threshold comparison mechanism and performs Orthogonal Frequency Division Multiplexing (OFDM) symbol boundary detection using correlation techniques. In this paper, a robust and efficient frame... [10 Apr 2008]
Effective Throughput: A Unified Benchmark for Pilot-Aided OFDM/SDMA Wireless Communication Systems
White Paper This paper studies the uplink performance of an orthogonal frequency division multiplexing (OFDM) wireless system where multiple antennas are utilized at the base station (BS). The system performance is determined by various transmission techniques... [10 Apr 2008]
Joint Dynamic Detection and Channel Estimation in MIMO OFDM Systems
White Paper MIMO OFDM is one of the most promising techniques to achieve high data rate over mobile wireless channels. In this paper, a MIMO OFDM system is developed, which employ interleaver at the transmitter to implement frequency domain diversity. [17 Sep 2007]
MIMO-OFDM Channel Estimation for Correlated Fading Channels
White Paper This paper presents MIMO-OFDM channel estimation for spatially correlated channels using frequency domain estimation techniques. First, the exploitation of spatial correlation on further improving the channel estimates is investigated. [07 Aug 2007]
Short Range Wireless Channel Prediction Using Local Information
White Paper The proposed method's usefulness is demonstrated by applying it to a multiuser OFDM system. Wireless channels change due to the mobility of users, which coupled with system delays, causes outdated Channel State Information (CSI) to be used for... [26 Apr 2007]
Time-Domain and Frequency-Domain Per-Tone Equalization for OFDM Over Doubly-Selective Channel
White Paper This paper proposes new time-domain and per-tone frequency-domain equalization techniques for OFDM transmission over time- and frequency-selective channels. This paper presents one mixed time- and frequency-domain equalizer and one per-tone... [19 Apr 2007]
