error orthogonal
RSS error orthogonalAnytime Coding on the Infinite Bandwidth AWGN Channel: A Sequential Semi-Orthogonal Code
White Paper It is well known that orthogonal coding can be used to approach the Shannon capacity of the power-constrained AWGN channel without a bandwidth constraint. This paper shows that it is possible to do this using a semi-orthogonal variation of pulse... [11 Jul 2008]
A Bandwidth Efficient Modulation Scheme Using Quasi-Orthogonal Sequences
White Paper High bandwidth efficiency and quasi-orthogonality between the modulation symbols allows to increase the normalized data rate with little or no degradation in the required signal-to-noise ratio per bit to achieve a given error probability compared... [11 Jul 2008]
Optimal Training Sequences for Channel Estimation in MIMO OFDM Systems in Mobile Wireless Channels
White Paper It is shown in this paper that the minimum mean square error (MMSE) is obtained with equispaced pilot tones in frequency, equipowered, orthogonal and phase shift orthogonal training sequences. The mean square error of the proposed scheme is derived... [03 Jul 2008]
Common Phase Error Correction for OFDM in Wireless Communication
White Paper Orthogonal Frequency Division Multiplex (OFDM) systems are very sensitive to phase noise caused by oscillator instabilities. In this paper the phase noise is resolved into two components, namely the Common Phase Error (CPE), which affects all the... [03 Jul 2008]
BER Minimized OFDM Systems With Channel Independent Precoders
White Paper This paper considers the minimization of uncoded bit error rate (BER) for the orthogonal frequency division multiplexing (OFDM) system with an orthogonal precoder. It analyzes the BER performance of precoded OFDM systems with zero forcing and... [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]
Optimal Training Design for MIMO OFDM Systems in Mobile Wireless Channels
White Paper This paper describes a least squares (LS) channel estimation scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems based on pilot tones. It is shown that the optimal pilot sequences are... [03 Jul 2008]
Low Cost Residual Phase Tracking Algorithm for OFDM-Based WLAN Systems
White Paper This paper presents the design of an efficient low complexity orthogonal frequency division multiplexing receiver targeting wireless local area networks. The focus is on mitigation of the residual frequency synchronization error and sampling... [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]
Channel Aware Unequal Error Protection for Image Transmission Over Broadband Wireless LAN
White Paper Orthogonal Frequency Division Multiplexing (OFDM) has been adopted in many broadband wireless communication standards. This paper investigates the leakage effect of pilot-symbol-assisted channel estimation techniques and proposes a channel-aware... [03 Jul 2008]
Scalable Video Transmission Over Orthogonal Frequency Division Multiplexing Wireless Channels
White Paper In this paper a wireless system for video transmission over Orthogonal Frequency Division Multiplexing (OFDM) systems is optimized. Rate Compatible Punctured Convolutional codes (RCPC codes) are used for error protection. [03 Jul 2008]
BER Optimized Channel Independent Precoder for OFDM System
White Paper This paper considers the minimization of bit error rate (BER) for OFDM systems with orthogonal precoders. Furthermore, in this case the conventional OFDM system has the largest BER among all OFDM systems with orthogonal precoders. [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]
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. Performance improvements are investigated through computer simulations... [03 Jul 2008]
Channel Estimation and Optimal Power Allocation for a Multiple-Antenna OFDM System
White Paper This paper proposes combining channel estimation and optimal power allocation approaches for a multiple-antenna orthogonal frequency division multiplexing (OFDM) system in high-speed transmission applications. [03 Jul 2008]
