ofdm systems
RSS ofdm systems
Complexity makes travellers miss their connection
Comment In the not too distant future, you will be able to add 3G Long Term Evolution (LTE), mobile WiMax, multiple in multiple out (MiMo) and orthogonal frequency division multiplexing (OFDM) to the mix. O is for Operating systems [12 Jun 2008]
ICI Mitigation for Pilot-Aided OFDM Mobile Systems
White Paper Orthogonal frequency-division multiplexing (OFDM) is robust against frequency selective fading due to the increase of the symbol duration. However, for mobile applications channel time-variations in one OFDM symbol introduce intercarrier... [16 May 2008]
Compress-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. This paper investigates the capacity of Compress-and... [11 Apr 2008]
ICI Cancellation Based Channel Estimation for OFDM Systems
White Paper Orthogonal Frequency Division Multiplexing OFDM), which is a multicarrier modulation scheme, splits high data rate information symbols into lower rate parallel data streams and transmits this parallel information on different orthogonal carriers. [11 Apr 2008]
Space-Time Coding in MISO-OFDM Systems With Implementation Impairments
White Paper Implementation of OFDM-based systems suffers from In-phase and Quadrature-phase (IQ) imbalances in the front-end analog processing. In this paper, the effect of IQ imbalances on an OFDM-based system with Alamouti coding is studied and an efficient... [10 Apr 2008]
On the Baseband Compensation of IQ Imbalances in OFDM Systems
White Paper Implementation of OFDM-based systems suffers from Inphase-Quadrature phase (IQ) imbalances in the front-end analog processing. OFDM is a widely recognized and standardized modulation scheme for future high bit rate communications. [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]
Adaptive Resource Allocation in Multiuser OFDM Systems With Proportional Fairness
White Paper Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique for achieving high downlink capacities in future cellular and wireless LAN systems. The sum capacity of MU-OFDM is maximized when each subchannel is assigned to... [10 Apr 2008]
Performance of MIMO OFDM Systems in Fading Channels With Additive TX and RX Impairments
White Paper The performance of OFDM based systems is seriously affected by imperfections in system implementation. To gain a better understanding of the influence of these impairments on the performance of multiple antenna OFDM systems, this paper studies a... [10 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]
Performance of Space-Combining Transmission Diversity With OFDM for Broadband Wireless Access Systems
White Paper This paper proposes a new diversity technique for broadband wireless access systems that uses orthogonal frequency division multiplexing (OFDM) and describes its performance. One is optimal antenna selection in the reception phase and the other is... [10 Apr 2008]
Carrier Seperated OFDM Systems for Multiaccess Wireless Communications
White Paper A carrier separated OFDM system is proposed to support high data rates in mobile multiple access environments. OFDM is considered to support high data rates and carrier separation is introduced to combat multipath fading. [10 Apr 2008]
Link Adaptation in OFDM Systems
White Paper This paper considers link adaptation in an orthogonal frequency division multiplexing (OFDM) system. OFDM is a promising digital modulation technique that effectively divides the frequency band into a number of narrow subcarriers that are each flat... [10 Apr 2008]
A Decision Directed Receiver for Alamouti Coded OFDM Systems
White Paper When the Alamouti code is applied (as a space-time block code) to an OFDM system with transmit diversity, the simple Alamouti decoding requires that each subchannel is flat-fading and constant over two symbol periods (Alamouti codeword period). [10 Apr 2008]
