ofdm in white papers
Performance Analysis of OFDM System Based on IEEE 802.11a
White Paper This paper analyzes the performance of OFDM system based on IEEE 802.11a specification. Recently, there are increasing demands among wireless mobile subscribers on the broadband wireless multimedia services with high capacity and reliability. [03 Jul 2008]
Research of DFT-OFDM and DWT-OFDM on Different Transmission Scenarios
White Paper The DFT based OFDM (DFT-OFDM) has currently drawn most of attention in the area of wireless communication. To combat ISI, ICI, cyclic prefix is insert between DFT OFDM symbols, and this will take up nearly 25 percent of bandwidth. [03 Jul 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]
BER Performances of a Differential OFDM System in Fading Channels
White Paper In an OFDM system, various modulation methods can be used in order to encode the binary information. If a differential phase modulation scheme is chosen, data can be encoded in the relative phase of consecutive symbols in each subchannel or in the... [11 Apr 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]
UWB Coexistence and Cognitive Radio: How Multiband-OFDM Leads the Way
White Paper The recent history of Ultrawideband communications technology has seen great debate over whether these UWB cause unacceptable interference to existing users of the same and nearby bands. Building on the IEEE 802.15.2 Recommended Practice and the... [11 Apr 2008]
OFDM for Mobile Data Communications
White Paper This paper describes Orthogonal Frequency Division Multiplexing (OFDM) and its application to mobile communications. OFDM is a modulation and multiple access technique that has been explored for over 20 years. [10 Apr 2008]
OFDM Versus Single Carrier With Cyclic Prefix: A System-Based Comparison
White Paper Most systems rely on the use of Orthogonal Frequency Division Multiplexing (OFDM) because of its capability to elegantly cope with multi-path interference. However, while OFDM provides a nice solution for the digital modem, its front-end... [10 Apr 2008]
OFDM Receiver Design
White Paper Othogonal Frequency Division Multiplex (OFDM) has gained considerable attention in recent years. In this project, authors implemented an OFDM receiver based 802.11a standard. Furthermore, since spatial diversity is the ultimate way to increase... [10 Apr 2008]
OFDM Code-Division Multiplexing With Pre-Equalization for Mobile Communications
White Paper In this paper, the potential of orthogonal frequency-division multiplexing-code-division multiplexing (OFDM-CDM) combined with the pre-equalization is investigated. The code-division multiplexing (CDM) component within an orthogonal frequency... [10 Apr 2008]
OFDM Receiver CORDIC Module
White Paper In OFDM receivers, orthogonality between sub-carriers can only be ensured when precise frequency translation between the txer and rxer is realized. Essentially, this indicates that OFDM receivers are more sensitive to RF-carrier frequency offset... [10 Apr 2008]
An Integrated OFDM Receiver for High-Speed Mobile Data Communications
White Paper This paper presents the system design of an integrated receiver for the next generation high-speed mobile data communications based on OFDM. An overview of the OFDM system suitable for mobile communications is described. [10 Apr 2008]
Constant Envelope OFDM Phase Modulation: Spectral Containment, Signal Space Properties and Performance
White Paper A class of constant envelope OFDM phase modulated (OFDM-PM) signals is studied. The motivation behind OFDM-PM is to alleviate the high peak-to-average power ratio of conventional OFDM systems. For small modulation indices, the OFDM-PM signals are... [10 Apr 2008]
Constant Envelope Binary OFDM Phase Modulation
White Paper A class of signaling called OFDM angle modulation is presented. These constant envelope OFDM based signals guarantee a 0dB PAPR thus are well suited for efficient nonlinear power amplification. This paper focuses on binary OFDM phase modulation... [10 Apr 2008]
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