Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 35 for “"Transmit diversity"”.
-
Transmit Diversity and its Application to Cooperative Networking
… space-time coding techniques to achieve spatial diversity. We observe that when correlation between the antennas in a local antenna array becomes high due to space constraints in a terminal, current performance achieving strategies do not actually deliver good results. Moreover, most mobile …
-
Performance evaluation of communication systems with transmit diversity
Transmit diversity is a key technique to combat fading with multiple transmit antennae for next-generation wireless communication systems. Space-time block code (STBC) is a main component of this technique. This dissertation consists of four parts: the first three discuss performance evaluation of …
-
Spreading and power control for multiple antenna transmit diversity
This thesis proposes a new transmission scheme for multiple antenna transmission at the base station of a wireless cellular system. We develop our new scheme in a wideband CDMA framework using multiple phases of Gold codes for spreading on different antennas. We evaluate the performance of this …
-
Information theory of transmit diversity and space-time code design
… the achievable information rates for multiple transmit multiple receive antenna systems in fast fading channels. Then we consider non-ergodic channel, where we evaluate asymptotic expression for the outage probability and note its striking similarity with the error probability. After that, we …
-
Unitary Space-Time Transmit Diversity for Multiple Antenna Self-Interference Suppression
A common practice for government defense agencies and commercial aeronautical companies is to use dual antennas on test flight air vehicles in order to overcome occlusion issues during high-speed telemetric maneuvers. The dual antennas, though never being masked at the same time, unfortunately lead …
-
Performance evaluation of transmit diversity techniques in the CDMA 2000 standard
… evaluates the performance of two forward-link transmit diversity techniques in the CDMA2000 standard: Space-Time Spreading (STS) and Phase-Sweep Transmit Diversity (PSTD). For each technique, the evaluation consists of conducting 9.6 kbps Markov calls in the field and measuring the mean …
-
Design of single-carrier frequency domain equalization (SC-FDE) with transmit diversity for wireless and optical communications
… wireless service is rising, there is a need to transmit high-speed packets over the wireless communication channel. Broadband data transmission over wireless channels commonly faces the challenges of multipath fading channels, which are both time and frequency selective. There is then a need to …
-
Laboratory and field trials evaluation of transmit delay Diversity applied to DVB-T/H networks
… with minimized environmental impact. The use of transmit diversity techniques with multiple antennas have long been proposed to improve the performance and capacity of wireless systems. Transmit diversity exploits the scattering effect inherent in the channel by means of transmitting multiple …
-
Retransmission strategies for moving networks over ricean fading channels
… HARQ and handover, and by exploiting space-time transmit diversity and beamforming via sofihandover.
-
Interference suppression and diversity for CDMA systems
… are investigated to suppress interference; transmit diversity is applied to multicarrier CDMA (MC-CDMA) systems to combat fading; packet combing is studied to provide both interference suppression and diversity for CDMA random access systems. The reduced-rank MMSE receiver that uses a …
-
Improving packet delivery efficiency using multi-radio diversity in wireless LANs
… and streaming video. We use the notion of path diversity to develop an approach that improves data delivery efficiency and throughput in presence of transmission errors. Path diversity relies on multiple access points (APs) covering a given area or multiple radios on the user's device (or both). …
-
Network lifetime extension, power conservation and interference suppression for next generation mobile wireless networks
… concept of power combining, whereby two users transmit same signal to the destination user, emulating transmit diversity with two transmit antennas. Analytical framework for the evaluation of the benefits of power combining, in terms of the total transmit power reduction, is defined. Simulation …
-
Cooperative multicast in wireless networks
… (or battery power), whereby we assume single transmitting node is engaged in a one-to-one or one-to-many transmission. In the second part of the thesis, we further investigate transmit diversity in the general context of cooperative routing, whereby multiple nodes are allowed for cooperative …
-
Concatenation of Space-Time Block Codes with ConvolutionalCodes
… efficiency of a communication system. Receive diversity techniques like maximal ratio receive combining have been popular means of introducing multiple antennas into communication systems. Space-time block codes present a way of introducing transmit diversity into the communication system with …
-
Low-complexity near-optimum detection techniques for non-cooperative and cooperative MIMO systems
… schemes and/or supporting a high number of transmit antennas/users. Hence, in this treatise three complexity-reduction schemes are devised specifically for LSD-aided iterative receivers in the context of high-throughput channel-coded SDMA/OFDM systems in order to maintain a near-optimum …
-
DSP implementation of trellis coded modulation and distributed space time coding
… time codes (STC). With STC, coded signals are transmitted from multiple antennas at the same time over a Rayleigh fading channel. STC combines of transmit diversity, coding and M-ary modulation to mitigate problems imposed by the fading channel, Two types of STC, space time coded modulation …
-
Channel Estimation for OFDM Systems With Transmitter Diversity
… because of its inherent equalisation simplicity. Transmitter diversity can effectively combat multipath channel impairments due to the dispersive wireless channel that can cause deep fades in some subchannels. The combination of the two techniques, OFDM and transmitter diversity, can further …
-
Channel estimation and signal enhancement for DS-CDMA systems
… than the existing S-T RAKE receivers. From transmitter side, we also proposed a transmit diversity (TD) technique in combination with differential detection for the DS-CDMA systems. It is shown that the proposed S-T TD scheme in combination with minimum variance distortionless response …
-
Interference Management in Heterogeneous Cellular Networks
… technologies including classical beamforming and transmit diversity, which are studied with consideration of the impact of intra-tier and inter-tier interference in HetNets.
-
A new generic maximum-likelihood metric expression for space-time block codes with applications to decoding
… block coding is a technique used to exploit diversity in a multiple-input multiple-output (MIMO) environment. Orthogonal space-time block codes (OSTBCs) are desirable because they can achieve full transmit diversity while maintaining a simple low-complexity maximum-likelihood (ML) decoding …
Page 1 of 2