ofdm
RSS ofdmImplementation of a MIMO OFDM Based Wireless LAN System
White Paper The combination of Multiple-Input Multiple-Output (MIMO) signal processing with Orthogonal Frequency Division Multiplexing (OFDM) is regarded as a promising solution for enhancing the data rates of next generation wireless communication systems... [10 Apr 2008]
Sliding Multiple Phase Differential Detection of Trellis-Coded MDPSK-OFDM
White Paper In this paper, the Viterbi decoder containing new branch metrics of the squared Euclidean distance with multiple order phase differences is introduced in order to improve the bit error rate (BER) in the differential detection of the trellis-coded... [10 Apr 2008]
Interpolation-Based Maximum Likelihood Channel Estimation Using OFDM Pilot Symbols
White Paper An interpolation-based maximum likelihood channel estimation scheme using OFDM pilot symbols is proposed. Instead of direction estimation of the frequency response on each subchannel, an interpolation filter is used on the pilot symbols to estimate... [10 Apr 2008]
Performance Analysis of Bit-Interleaved Space-Time Coding for OFDM in Block Fading Channels
White Paper In this paper, the performance of a bit-interleaved space-time coding (BISTC) scheme is investigated for OFDM systems. Performance analyses based on both pairwise error probability (PEP) and error bounds are conducted over a more general block... [10 Apr 2008]
A Study of Channel Estimation in OFDM Systems
White Paper The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and... [10 Apr 2008]
Linearly Precoded or Coded OFDM Against Wireless Channel Fades?
White Paper Orthogonal Frequency Division Multiplexing (OFDM) converts a dispersive channel into parallel subchannels and thus facilitates equalization. But when the channel has nulls close to or on the FFT grid, OFDM faces serious symbol recovery problems. [10 Apr 2008]
An Optimum OFDM Receiver Exploiting Cyclic Prefix for Improved Data Estimation
White Paper Orthogonal frequency division multiplexing (OFDM) is a promising technique for multi-antenna broadband systems, since it significantly reduces receiver complexity by providing orthogonal sub-channels. [10 Apr 2008]
On the Baseband Compensation of IQ Imbalances in OFDM Systems
White Paper OFDM is a widely recognized and standardized modulation scheme for future high bit rate communications. Implementation of OFDM-based systems suffers from Inphase-Quadrature phase (IQ) imbalances in the front-end analog processing. [10 Apr 2008]
Space-Time Coding in MISO-OFDM Systems With Implementation Impairments
White Paper Implementation of OFDM-based systems suffers from In-phase and Quadrature-phase (IQ) imbalances in the front-end analog processing. In this paper, the effect of IQ imbalances on an OFDM-based system with Alamouti coding is studied and an efficient... [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 MIMO OFDM Systems in Fading Channels With Additive TX and RX Impairments
White Paper The performance of OFDM based systems is seriously affected by imperfections in system implementation. To gain a better understanding of the influence of these impairments on the performance of multiple antenna OFDM systems, this paper studies a... [10 Apr 2008]
M-Sequences for OFDM Peak-to-Average Power Ratio Reduction and Error Correction
White Paper A recent letter proposed the use of a block coding scheme for OFDM based on m-sequences. We show that the peak-to-average power for this scheme was not calculated correctly and we recommend against its use. [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. The proposed method is applicable to OFDM systems with a large number of subchannels. [10 Apr 2008]
Real Time Implementation on FPGA of an OFDM Based Wireless LAN Modem Extended With Adaptive Loading
White Paper For wireless Local Area Network (LAN) the standards have chosen orthogonal frequency division multiplex (OFDM) as modulation scheme. This paper presents the implementation aspects of an OFDM based wireless LAN modem together with adaptive loading... [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]
