transmitter diversity
LDPC Based Differential Unitary Space-Frequency Coding for MIMO-OFDM Systems
White Paper This paper proposes a novel LDPC based differential unitary space-frequency coding (DUSFC) scheme for MIMO-OFDM systems when neither the transmitter nor the receiver has access to the channel state information (CSI). [10 Aug 2008]
Performance Comparison of OFDM Carrier Synchronization Algorithms With Diversity
White Paper The experimental setup is comprised of a Dual Arbitrary waveform generator (E4437B) having two wideband 40Megasamples/second digital to analog converters feeding in-phase and quadrature modulators with an RF transmitter operating at 2.4GHz and two... [03 Jul 2008]
Performance Analysis of Diversity Combining Method for OFDM Blind Carrier Synchronization
White Paper Carrier Frequency Offset (CFO) between transmitter and receiver local oscillators must be estimated and compensated at the receiver to maintain orthogonality of these subchannels. Orthogonal Frequency Division Multiplexing (OFDM) communications... [03 Jul 2008]
High Data Rate MIMO-OFDM System With Orthogonal Delay Diversity Realization
White Paper The delayed orthogonality with respect to frequency tones among different transmitter antennas guarantees to exploit the full spatial and frequency diversity of the frequency-selective multi-input multi-output (MIMO) channel. [03 Jul 2008]
Antenna Selection for Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing Systems
White Paper To overcome this problem, a fewer number of RF chains can be used at the transmitter and/or the receiver along with a selection of antennas. MIMO systems can also be used to increase the diversity order by employing space-time coding. [03 Jul 2008]
Blind Carrier Offset Estimation for MIMO OFDM Systems: Cramer Rao Bound and Nonlear Least Squares
White Paper Carrier frequency offset between transmitter and receiver local oscillators must be estimated and compensated at the receiver to maintain orthogonality of these subchannels. This paper presents the nonlinear least squares (NLS) estimator which... [03 Jul 2008]
Transmitter Space-Time Diversity for Broadband MC-CDMA Systems
White Paper Severe Doppler spread can significantly degrade the performance of a wireless OFDM based multi-carrier system. The individual subcarriers in an OFDM system are orthogonal in a time invariant multipath channel by using the cyclic prefix. [03 Jul 2008]
Iterative Channel Estimation Approach for Space-Time/Frequency Coded OFDM Systems With Transmitter Diversity
White Paper Relying on the unifying signal model for SF-OFDM and ST-OFDM transmitter diversity systems, we develop computationally efficient, maximum a posteriori (MAP) channel estimation algorithms according to the MAP criterion. [03 Jul 2008]
Performance Improvement of OFDM System Using Transmit Diversity With Space-Time Block Coding
White Paper Transmitter diversity with space-time block coding (STBC) is an attractive transmission scheme to improve the performance of systems. The block-interleaved (BI) STBC and frequency hopping (FH) OFDM are proposed in the study to provide the maximum... [03 Jul 2008]
Real Time LMMSE Channel Estimation for Wireless OFDM Systems With Transmitter Diversity
White Paper This paper proposes an enhanced low-complexity channel estimation technique for the wireless Orthogonal Frequency-Division Multiplexing (OFDM) systems with transmitter diversity in the presence of multipath propagation. [03 Jul 2008]
Antenna Diversity for OFDM Using Cyclic Delays
White Paper A new technique is presented for exploiting antenna diversity in OFDM systems, which can be applied at the transmitter and/or at the receiver. The core idea concerns the introduction of cyclic delays to the effective parts (FFT-parts) of the OFDM... [03 Jul 2008]
OFDM Code-Division Multiplexing With Pre-Equalization for Mobile Communications
White Paper While, by applying pre-equalization at the OFDM-CDM transmitter the task of equalization at the receiver can be completely avoided. The code-division multiplexing (CDM) component within an orthogonal frequency-division multiplexing (OFDM) system... [10 Apr 2008]
Performance of MT-CDMA System With Post-Detection Diversity Reception Over Rician Fading Channel
White Paper Here, the influence of the order of diversity and number of tones is studied for given bandwidth (BW), bit rate and transmitter power. The system uses differential binary phase shift keying (DBPSK) modulation and post detection diversity combining... [10 Apr 2008]
Joint Dynamic Detection and Channel Estimation in MIMO OFDM Systems
White Paper Transmitter diversity and channel estimation play important roles in improving the system performance. In this paper, a MIMO OFDM system is developed, which employ interleaver at the transmitter to implement frequency domain diversity. [17 Sep 2007]
Multimode Precoding for MIMO Wireless Systems
White Paper Multiple-Input Multiple-Output (MIMO) wireless systems obtain large diversity and capacity gains by employing multielement antenna arrays at both the transmitter and receiver. The basic idea is to use transmitter channel information to adaptively... [31 Aug 2007]
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