method orthogonal frequency
Performance Comparison of OFDM Carrier Synchronization Algorithms With Diversity
White Paper This paper compares the performances of Non Linear Least Squares (NLS) method and Maximum Likelihood Estimation (MLE) method used for carrier frequency synchronization in Orthogonal Frequency Division Multiplexing (OFDM) communication systems. [03 Jul 2008]
Performance Analysis of Diversity Combining Method for OFDM Blind Carrier Synchronization
White Paper Orthogonal Frequency Division Multiplexing (OFDM) communications transform frequency selective channels into multiple low rate subchannels robust against frequency selective fading. Carrier Frequency Offset (CFO) between transmitter and receiver... [03 Jul 2008]
Blind Estimation of OFDM Carrier Frequency Offset Via Oversampling
White Paper Blind deterministic estimation of the orthogonal frequency division multiplexing (OFDM) frequency offset via over-sampling is proposed in this paper. This method utilizes the intrinsic phase shift of neighboring sample points incurred by the... [03 Jul 2008]
Intercarrier Interference Self-Cancellation Scheme for OFDM Mobile Communication Systems
White Paper For orthogonal frequency-division multiplexing (OFDM) communication systems, the frequency offsets in mobile radio channels distort the orthogonality between subcarriers resulting in intercarrier interference (ICI). [03 Jul 2008]
Frequency Domain IQ Imbalance Correction Scheme for Orthogonal Frequency Division Multiplexing (OFDM) Systems
White Paper This paper describes the sources and the effect of the IQ imbalance as well as a new method for correcting the error due to the imbalance in Orthogonal Frequency Division Multiplexing (OFDM) systems. Future, high bit rate communication systems... [03 Jul 2008]
OFDM Demodulation Method With Variable Effective Symbol Duration
White Paper In an orthogonal frequency division multiplexing (OFDM) system, the bit error performance is degraded in the presence of multiple propagation paths whose excess delays are longer than the Guard Interval (GI), because the orthogonality between... [03 Jul 2008]
Sub-Carrier Based Weight Technique for OFDM Systems
White Paper This paper presents a new method to extend adaptive antenna array techniques to mitigate strong co-channel interference in an orthogonal frequency division multiplexing system. The proposed algorithm uses optimal weights determined from classical... [03 Jul 2008]
Subband Methods for OFDM Equalization
White Paper This paper proposes two equalization methods for orthogonal frequency-division multiplexing (OFDM) modulation. These methods are intended to be alternatives to the known cyclic prefix equalization (CPE) method, and are derived using ideas from... [03 Jul 2008]
An Orthogonal Projection-Based Approach for PAR Reduction in OFDM
White Paper High peak-to-average power ratio (PAR) of the transmitted signal is one of the limitations to using orthogonal frequency-division multiplexing (OFDM) systems. This paper presents a novel orthogonal projection-based partial transmit sequences... [03 Jul 2008]
A New OFDM Demodulation Method With Variable-Length Effective Symbol and ICI Canceller
White Paper In an orthogonal frequency division multiplexing (OFDM) system, the bit error performance is degraded in the presence of multiple propagation paths whose excess delays are longer than the Guard Interval (GI), because the orthogonality between... [03 Jul 2008]
Wideband Orthogonal Frequency Multiplexing (W-OFDM)
White Paper OFDM (Orthogonal Frequency Division Multiplexing, then Frequency Division and then Orthogonal. Multiplexing)is a method of using many carrier waves instead of only one, and using each carrier wave for only part of the message. [03 Jul 2008]
Interpolation Based Unitary Precoding for Spatial Multiplexing MIMO-OFDM With Limited Feedback
White Paper Spatial multiplexing with linear precoding is a simple technique to take advantage of the high spectral efficiency provided by multiple-input multiple-output (MIMO) systems, and it can be simply implemented over frequency selective channels by... [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. The proposed algorithm can robustly detect the... [10 Apr 2008]
Reducing Peak-to-Average Ratios Using OFDM Necklaces
White Paper In communications systems using orthogonal frequency division multiplexing (OFDM), the Fourier transform of the data sequence is transmitted which leads to high peak-to-average power ratios creating implementational difficulties. [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. In addition, to offset the quantization noise caused by large differences... [10 Apr 2008]
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