OFDM/SDMA
Multiple CFOs in OFDM SDMA Uplink: Interference Analysis and Compensation
... the OFDM signals, some interference remains in the system after CFO compensation, which cannot be compensated as long as simple frequency domain processing is ...in OFDM-SDMA systems have been ...
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Comparative Analysis of GA-MMSE and PSO-MMSE Based MUD Technique Aided SDMA/OFDM System
... As shown in the upper half of Figure 3.Iinformation bit blocks b(l) l , ··· ,L of the L mobile users are first encoded by the L independent FEC encoders. The resultant coded bits b(l)s are then mapped to Pulse Amplitude ...
8
Performance of SDMA Multi User Detection Techniques for Walsh Hadamard Spread OFDM Schemes
... multi-user OFDM detection tech- niques have recently been addressed in a variety of pub- ...user OFDM systems, spreading has been recognized as an ...
5
TCM, TTCM, BICM and BICM ID Assisted MMSE Multi User Detected SDMA OFDM Using Walsh Hadamard Spreading
... Figure 3: BER versus E h jNo performance of the WHTS-assisted MMSE-SDMA-OFDM system employing a 4QAM scheme for transmission over the SWATM left and the COST207 €IT right channels, where[r] ...
5
Performance of GA and PSO aided SDMA/OFDM Over Loaded System in a Near Realistic Fading Environment
... Most classic detection techniques suffer from specific limitations in rank-deficient scenarios. Suboptimal non- linear MUDs based on successive interference cancella- tion (SIC) or parallel interference cancellation ...
7
R}eview and Analysis of Multiuser Detection Techniques for Smart Antenna of SDMA-{OFDM
... discussed OFDM System which is most useful technology in these era, we have seen mathematical representations of this system and its combination with SDMA ...the SDMA-OFDM based communication ...
5
Performance of Some Metaheuristic Algorithms for Multiuser Detection in TTCM Assisted Rank Deficient SDMA OFDM System
... The OFDM modem used in our simulations employed 128 ...detected SDMA-OFDM ...be OFDM symbol-invariant, in which the taps of the impulse response are assumed to be constant for the duration of ...
11
Genetically Enhanced TTCM Assisted MMSE Multi user Detection for SDMA OFDM
... Furthermore, the achievable performance can be significantly im- proved, if Forward Error Correction (FEC) schemes, such as for ex- ample Turbo Convolutional (TC) codes [5] are incorporated into the SDMA system. ...
5
Slow subcarrier hopped Space Division Multiple Access OFDM systems
... TTCM-aided SDMA-OFDM system, which may be referred to as Slow-SubCarrier-Hopping (SSCH) assisted TTCM-aided SDMA-OFDM, where each subcarrier is shared by a certain number of users in the ...
5
Iterative Joint Channel Estimation and Symbol Detection for Multi User MIMO OFDM
... and different numbers of GA-JCEMUD iterations are provided at the left-hand and right-hand sides of Figure 2, respectively. The perfor- mances of the systems employing the linear MMSE MUD or the op- timum ML MUD are also ...
5
Interference-free SDMA for FBMC-OQAM
... to OFDM for future wireless communication systems ...Like OFDM, FBMC-OQAM decomposes the communication chan- nel in a set of lower-bandwidth subchannels that can therefore also be compensated at a low ...
13
Multiple antenna aided OFDM employing genetic algorithm assisted minimum bit error rate multiuser detection
... Even though the MBER detector of [8] is capable of main- taining a good performance, the convergence of the algorithm is sensitive to the choice of the algorithm’s parameters. For ex- ample, the choice of the initial ...
9
Multiuser MIMO OFDM Systems using Subcarrier Hopping
... SSCH/SDMA- OFDM system is capable of achieving a high frequency diversity, and hence exhibits a high robustness to ...(SISO) OFDM systems, which are subject to various design constraints, such as ...
8
Iterative multi user detection for OFDM using biased mutation assisted genetic algorithms
... Figure 9: Eb/No Gain at the BER of i0-5 versus the number of IGA MUD iterations left and the number of users right performance of the TTCM-assisted MMSE-IGA-SDMA-OFDM system using BQM, w[r] ...
5
A Joint Beamforming based SDMA Protocol for IEEE 802.11n Downlink
... networks. After surveying random access based MAC protocols for MU-MIMO enabled WLANs, [4] challenged to design more effective MU-MIMO MAC protocols. [5] proposed a novel MAC scheme combined with a low- complexity ...
5
A Limited Feedback SDMA for Downlink of Multiuser MIMO Communication System
... opportunistic SDMA is proposed in [15], which requires the scheduled users to feed back full CSI using an extra feedback ...an SDMA codebook, to guarantee a reasonable performance in sparse ...based ...
13
Reduced Complexity Maximum Likelihood Detection in Downlink SDMA Systems
... Abstract— The literature of up-link SDMA systems is rich, but at the time of writing there is a paucity of information on the employment of SDMA techniques in the down-link. Hence, in this paper a Space ...
5
A Survey on Space Division Multiple Access (SDMA) Performance with Scheduling
... The need for coordinated MAC and physical layers in a system architecture is pronounced in antenna array networks. Only limited results are available to date, one of which is the so-called space-division multiple-access ...
8
Analysis of Space Time Frequency Coding in of dm Systems for Future Wireless Communications
... the terminal is considered. Figure 1 depicts the transmitter modules. Information bits bk are first channel encoded with a encoder of coding rate R. The encoded, interleaved bits are then fed to a phase shift keying ...
5
Adaptive Multicarrier Modulation: A Convenient Framework for Time Frequency Processing in Wireless Communications
... the OFDM signal—which is the superposition of a high number of modulated subchannel signals—may exhibit a high instantaneous signal peak with respect to the average signal ...high OFDM signal peaks—which is ...
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