method orthogonal
RSS method orthogonalRobust 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]
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... [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]
Comparison of Diverse Optical CDMA Codes Using a Normalized Throughput Metric
White Paper This new metric is used to show that optical-orthogonal codes (OOCs) with a weight of 4 perform best at low offered loads while OOCs with weight 5 should be used at higher offered loads. A new method of comparing optical CDMA codes of different... [10 Apr 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]
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]
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... [31 Jul 2007]
Inter-Carrier Interference Cancellation for OFDM Systems
White Paper Orthogonal Frequency Division Multiplexing (OFDM) is an emerging multi-carrier modulation scheme, which has been adopted for several wireless standards such as IEEE 802.11a and HiperLAN2. This paper investigates three methods for combating the... [27 Jul 2007]
Eliminating the OFDM Cyclic Prefix
White Paper A novel method is presented to estimate the frame time and carrier frequency offset in Orthogonal Frequency-Division Multiplexing (OFDM) systems using a variable number of time-domain pilot signals. The performance and computational intensity of... [18 Apr 2007]
Integer-Based Constellation Shaping Method for PAPR Reduction in OFDM Systems
White Paper In this paper, the problem of reducing the Peak to Average Power Ratio (PAPR) in an Orthogonal Frequency Division Multiplexing (OFDM) system is considered. The encoding method, following the method introduced in the work of Kwok, is derived from a... [18 Apr 2007]
Multiuser Detection and Channel Estimation in MIMO OFDM Systems Via Blind Source Separation
White Paper This paper proposes a blind multiuser detection and channel estimation method for Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency-Division Multiplexing (OFDM) systems based on Blind Source Separation (BSS). [18 Apr 2007]
Bandwidth and Power Efficiency Considerations for Optimal Training in OFDM
White Paper Orthogonal Frequency Division Multiplexing (OFDM) has been adopted by many high speed transmission standards. To improve the power efficiency, the authors employ a blind SeLected Mapping (SLM) PAR reduction method in conjunction with superimposed... [18 Apr 2007]
An Efficient Frequency Offset Estimator for OFDM Systems and Its Performance Characteristics
White Paper This paper proposes new frequency synchronization algorithm for Orthogonal Frequency Division Multiplexing (OFDM) systems requiring only one training symbol, based on a conventional method which requires two training symbols. [14 Apr 2007]
Blind and Semiblind Spatio-Temporal Diversity for OFDM Systems
White Paper Adaptive antenna arrays can be used to improve the performance of Orthogonal Frequency Division Multiplexing systems. A blind method is firstly proposed for the maximization of the temporal Signal to Noise plus Interference Ratio (SNIR) in... [14 Apr 2007]
New Frame Synchronization Technique for OFDM/OFDMA and MC-CDMA Systems
White Paper In the context of Orthogonal Frequency Division Multiplexing (OFDM), most papers define OFDM symbol synchronization as frame synchronization. The main contribution of this work is to propose a novel, low complexity, frame synchronization method for... [14 Apr 2007]
