rate fading channels
Error Probability Minimizing Pilots for OFDM With M-PSK Modulation Over Rayleigh-Fading Channels
White Paper Orthogonal frequency division multiplexing (OFDM) with pilot symbol assisted channel estimation is a promising technique for high rate transmissions over wireless frequency-selective fading channels. This paper analyzes the symbol error rate (SER... [10 Apr 2008]
Performance Analysis of Bit-Interleaved Space-Time Coding for OFDM in Block Fading Channels
White Paper An improved error bound assisted with a limitation and uniform interleaver approach is derived and shown to provide much more accurate error rate estimation than the standard union bound in block fading channels. [10 Apr 2008]
Link Adaptation in OFDM Systems
White Paper OFDM is a promising digital modulation technique that effectively divides the frequency band into a number of narrow subcarriers that are each flat-fading. Link Adaptation (LA) is a powerful means of increasing throughput in wireless channels by... [10 Apr 2008]
Space-Time-Frequency Coded OFDM Over Frequency-Selective Fading Channels
White Paper This paper proposes novel space-time-frequency (STF) coding for multiantenna orthogonal frequency-division multiplexing (OFDM) transmissions over frequency-selective Rayleigh fading channels. In wireless links, multipath fading causes performance... [10 Apr 2008]
Viterbi Decoding Strategies for 5 GHz Wireless LAN Systems
White Paper These systems employ Orthogonal Frequency Division Multiplexing (OFDM) technology, and utilize Forward Error Correction (FEC) coding, based on a 1/2-rate convolutional encoder, to combat frequency selective fading caused by multipath channels. [05 Dec 2007]
PAPR Reduction of OFDM Signal Using Turbo Coding and Selective Mapping
White Paper Orthogonal Frequency Division Multiplexing (OFDM) technique is a promising technique to offer high data rate and reliable communications over fading channels. The main implementation disadvantage of OFDM is the possibility of high Peak to Average... [18 Apr 2007]
Detrimental Effects of Filtering in an OFDM System Using Pilot Based Channel Estimation
White Paper By using an improved Gaussian approximation for the Rayleigh fading channel for error rate estimation, this paper shows that this is equivalent to making the assumption that the interference is Gaussian noise experienced in a Rayleigh fading channel. [18 Apr 2007]
A Comparison of Blind Channel Estimation Schemes for OFDM in Fading Channels
White Paper The aim is to study the performance of these schemes in fading channels and thus give a critical comparison of them in the environment where they are most expected to be used. The proposed new algorithm is found to be outperforming the other two... [14 Apr 2007]
Performance of Coherent Impulse Radio and Multiband-OFDM on IEEE UWB Channels
White Paper The performance of the coded multiband-OFDM systems on CM1 is worse than on CM4, and the performance on CM4 is worse than on an uncorrelated Rayleigh fading channel. The investigated impulse radio systems use approximately the spectrum 3ñ6 GHz and... [14 Apr 2007]
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. It's necessary to reduce the frequency offset to a small fraction... [13 Apr 2007]
Limited Feedback Power Loading for OFDM
White Paper Orthogonal Frequency Division Multiplexing (OFDM) is a practical technique for communicating over broadband channels in multi-path fading environments. It is well known that varying the power allocation from frequency tone-to-frequency tone... [13 Apr 2007]
Approaching MIMO-OFDM Capacity With Closed-Loop V-BLAST
White Paper This paper studies schemes for partial channel feedback in Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) block-fading channels. Such optimization minimizes the total transmit power for support of an aggregate... [11 Apr 2007]
Optimal Training and Pilot Pattern Design for OFDM Systems in Rayleigh Fading
White Paper This paper deals with two major considerations for Pilot Symbol Assisted Orthogonal Frequency Division Multiplexing (PSA-OFDM) systems when operated over Rayleigh fading channels. Incorporating linear interpolation and choosing appropriate system... [11 Apr 2007]
Algorithms for Quantized Precoded MIMO-OFDM Systems
White Paper In the case of .at-fading channels, considerable work has been done in reducing the feedback information. This work, however, does not naturally extend to the case of frequency selective channels and leads to an explosion in the feedback overhead. [11 Apr 2007]
Transmit Optimization for MIMO-OFDM With Delay-Constrained and No-Delay-Constrained Traffic
White Paper Let M be the minimum between the number of transmit and receive antennas and N the number of subcarriers, the authors propose a SubChannel Grouping (SCG) technique, which divides the total number of MN space-frequency MIMO-OFDM subchannels into M... [11 Apr 2007]
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