symbol ofdm system
Spectral Weighting Functions for Single-Symbol Phase-Noise Specifications in OFDM Systems
White Paper For the specification of phase-noise requirements for the front-end of a HiperLAN/2 system the authors investigated available literature on the subject. Literature differed in several aspects. One aspect is in the type of phase-noise used (Wiener... [03 Jul 2008]
Asymptotic Performance of Transmit Diversity Via OFDM for Multipath Channels
White Paper Here it shows that when the Alamouti code is placed within an OFDM structure, using adjacent frequency bands rather than consecutive symbol intervals, it can asymptotically achieve the same performance in multipath fading as the Alamouti code in... [03 Jul 2008]
Transmitter Space-Time Diversity for Broadband MC-CDMA Systems
White Paper The orthogonality is destroyed, when the channel is time variant and its characteristics are changing throughout the duration of an OFDM symbol. Severe Doppler spread can significantly degrade the performance of a wireless OFDM based multi-carrier... [03 Jul 2008]
OFDM Demodulation Method With Variable Effective Symbol Duration
White Paper This paper proposes a new OFDM demodulation method with a variable effective symbol duration, in order to improve the bit error performance in the presence of multipaths whose excess delays are longer than the GI. [03 Jul 2008]
ICI Mitigation for OFDM Mobile Systems
White Paper Orthogonal Frequency Division Multiplexing (OFDM) is robust against Inter-Symbol-Interference (ISI) due to the increase of the symbol duration. This gets more severe as mobile speed, carrier frequency or OFDM symbol duration increases. [03 Jul 2008]
Performance Analysis of OFDM System Based on IEEE 802.11a
White Paper However, ISI (Inter-Symbol Interference), which is the severe problem in the case of the existence of multipath fading, can be occurred more frequently in high-speed multimedia data transmission. This paper analyzes the performance of OFDM system... [03 Jul 2008]
A New OFDM Demodulation Method With Variable-Length Effective Symbol and ICI Canceller
White Paper This paper proposes a new OFDM demodulation method with a variable-length effective symbol and a multi-stage inter-carrier interference (ICI) canceller, in order to improve the bit error performance in the presence of multipaths whose excess... [03 Jul 2008]
Channel Estimation and Optimal Power Allocation for a Multiple-Antenna OFDM System
White Paper Based on the channel estimates, the optimal power allocation solution, which maximizes the bandwidth efficiency, is derived under power and quality of service (QoS) (symbol error rate) constraints. This paper proposes combining channel estimation... [03 Jul 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]
An Integrated OFDM Receiver for High-Speed Mobile Data Communications
White Paper The effects of non-ideal transmission conditions of the OFDM system including channel estimation errors, symbol timing offset, carrier and sampling clock offset, phase noise and time-selective fading are analyzed. [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]
On the Design of an FPGA-Based OFDM Modulator for IEEE 802.16-2004
White Paper Current and future communication schemes tend to use OFDM systems in order to provide high baud rates and less inter symbol interference. The work discussed in this paper presents the design, validation and FPGA based implementation of an... [08 Jan 2008]
PAPR Reduction in OFDM Systems Using Constellation Shaping
White Paper OFDM prevents Inter Symbol Interference (ISI) by inserting a guard interval and mitigates the frequency selectivity of a multi-path channel by using a simple equalizer. Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier... [24 Jul 2007]
VLSI Implementation of OFDM Modem
White Paper A set of orthogonal sub-carriers together forms an OFDM symbol. OFDM is a multi-carrier system where data bits are encoded to multiple sub-carriers, while being sent simultaneously. This makes the OFDM system resistant to multi-path effects. [25 Jun 2007]
Detrimental Effects of Filtering in an OFDM System Using Pilot Based Channel Estimation
White Paper By making use of standard Gaussian approximation to the interference for the AWGN channel, the paper illustrates how to estimate the symbol error rate of a M-QAM system. The effects of performing channel estimation in AWGN and Rayleigh channels... [18 Apr 2007]
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