The combination of vertical Bell Laboratories layered space-time (V-BLAST) and orthogonal frequency division multiplexing (OFDM) is a promising solution fo Comparison Study of Low-Complexity Detection Schemes Exploiting Subcarrier Correlation for V-BLAST OFDM - IEEE Conference Publication

This paper presents a preliminary study on a non-line-of-sight ... Non-line-of-sight identification via space-frequency correlation in MIMO-OFDM systems: A preliminary study ... In this technique, a measure, subcarrier correlation difference (SCD), is introduced and used to identify NLOS conditions. SCD is defined as the difference of cross ...

Performance Analysis of OFDM Repeater Networks with Spatial Fading Correlation ... the system performance with spatial correlation per subcarrier is evaluated. Previously, it is reported that the effect of correlation can be reduced by the Time Shifted Sampling (TSS)

PDF | In this paper, a novel multiple antenna-OFDM transmission approach, called spatial modu-lation (SM)-OFDM is presented. SM entirely avoids inter-channel interference (ICI) at the receiver ...

The interesting application of spatial modulation to OFDM system was proposed under the name OFDM with Subcarrier Index Modulation (OFDM-SIM) in [5]. In this scheme, OFDM active subcarriers ...

Study of Timing Synchronization in MIMO-OFDM Systems Using DVB-T Farhan Farhan Electrical Systems Technology Instructor, A-B Tech, Asheville NC, USA ABSTRACT OFDM (Orthogonal Frequency Division Multiplexing)provides the promising physical layer for 4G and 3GPP LTE Systems in terms of efficient use of bandwidth and data rates.

In demodulated OFDM specify each user by a few numbers of subcarriers, which in wireless part. • Compare the proposed system by pervious subcarrier multiplexing OCDMA system. • Using the Flexible Cross Correlation (FCC) code, which is proved in reference papers, as good code compare to …

Research Article Subcarrier grouping with environmental sensing for MIMO-OFDM systems over correlated double-selective fading channels

Underwater Acoustic OFDM: Algorithm Design, DSP Implementation, and Field Performance Lei Wan, Ph.D. University of Connecticut, 2014 Multicarrier modulation in the form of orthogonal frequency division multi-plexing (OFDM) has now been recognized as an appealing solution for high data

Throughput study for a dynamic OFDM-FDMA system with inband signaling. ... S YSTEM M ODEL certain correlation behavior in time and frequency We assume J wireless terminals to be located is assumed, characterized by an exponential power within a cell. ... in “Multiuser OFDM with adaptive subcarrier, bit and order to represent the newly ...

10/17/2009 · OFDM code with 16-QAM modulation. Can be easily Understood and modified. 4.0. ... hi every body.i had 1 proplem about the ofdm simulate.this is the last year i study at shool.so i have 1 project that about OFDM.but i did'nt know how to simulate that.some one …

High Performance and Area Efficient Correlation for IEEE 802.16 OFDM Using FPGA ... (OFDM) system may be used. Orthogonal Frequency Division Multiplexing (OFDM) was first developed in the 1950‟s. OFDM is a method of encoding digital data on to a ... The sub channels spectral overlap each other but the subcarrier signals are still orthogonal ...

Estimation of CFO and STO for an OFDM using general ICI self-cancellation precoding ... Using distinctive correlation functions, Chin ... where the CFO ε f is normalized to the subcarrier spacing of the OFDM. This study assumes that the receiver has performed symbol time coarse synchronization ...

correlation on MIMO capacity/mutual information (see, e.g., [8], [9], [12], and [13]). We do not follow this line of work here, however, since our primary focus is to study the impact of frequency-selective fading on mutual information, in which case the effect of correlation is observed across frequency.

combination of orthogonal frequency-division multiplexing (OFDM) and multiple-input multiple-output (MIMO) technologies, referred to as MIMO-OFDM, is currently under study as one of the most promising candidate for next-generation communications systems ranging from wireless LAN to broadband access.

It is clear that in CI-SOFDM the cross correlation term paly a dominant role in PAPR. In conventional OFDM with BPSK modulation the worst case PAPR is N , when CI-SOFDM is evaluated, the square of maximum amplitude equals the average of power in time domain resulting in a PAPR equal to 1 which is much lower than N .

Efﬁcient Estimation of Carrier and Sampling Frequency Offsets in OFDM Systems Yonathan Murin and Ron Dabora ... In this work we study joint estimation of the CFO and the SFO for two scenarios: known CIR and ... l,k denote the ICI at the k’th subcarrier of the l’th OFDM symbol. Applying steps similar to the steps leading to [7, Eqns. ...

Orthogonal Frequency Division Multiplexing (OFDM) is a special case of FDM, which is implemented in digital communication systems. In this technology, multiplexing is applied to independent signals, which are sub-sets of one main signal, and applied to independent channels (sub-carriers) of a bandwidth. Here a user utilizes all sub- carriers to transmit its data.

subcarriers and k is the index of subcarrier within an OFDM symbol [8], [9]. ... correlation matrix of pilot subchannels with its LS ... A Comparative Study of Channel Estimation Techniques for OFDM in DVB-T2 A Comparative Study of Channel Estimation Techniques for OFDM in DVB-T2 ...

We're upgrading the ACM DL, and would like your input. Please sign up to review new features, functionality and page designs.

To facilitate the estimation of the channel in an OFDM system (such as WiMax, WiBro, WiFi, and 3.9/4G), known signals or pilots could be inserted in the transmitted OFDM symbol. Different methods can then be applied to estimate the channel using these known pilots.

Baixe no formato PDF, TXT ou leia online no Scribd. Sinalizar por conteúdo inapropriado

Approach: This study introduced a new performance study to enhance the Orthogonal Frequency Division Multiplexing (OFDM) system based on both efficient iterative number of subcarrier estimation techniques and a tracking algorithm was proposed. Result: The performance of system

MIMO-OFDM system is designed as an extension of single-antenna OFDM system with narrowband multiple-antenna processing applied per OFDM subcarrier. We consider OFDM system with M = 16 sub-carriers and 2 cyclic prefix symbols to combat frequency selectivity of wireless channel. Multi-antenna processing based on singular value

A method and apparatus for performing channel estimation in an Orthogonal Frequency Division Multiplexing (OFDM) wireless communication system. The method and apparatus includes receiving a training sequence at each of a plurality of predetermined subcarriers; performing primary channel estimation on each of the training sequences by a Least Square (LS) algorithm; grouping the …

Dual codebook structure to match antenna correlation patterns relatively high correlation between co-polarized TX antennas relatively low correlation between x-polarized antenna sets scattering mostly around UE low RX correlation 8 CSI-RS precoders follow Kronecker structure W 1 - grid of beams within co-pol antennas: 4x1 DFT vectors W 2

Eigenvalue Variation in MIMO OFDM Systems ... matrices deﬁned for each OFDM subcarrier and investigate their variation across frequency. Since the throughput and ... true channel values. Again, the correlation between the true and estimated channels can be used to replace the frequency

Orthogonal frequency Division Multiplexing (OFDM) is a multicarrier modulation technique where high rate ... correlation between them ensuring zero inter carrier interference (ICI). Thus during extracting information from one subcarrier, the effect of the adjacent subcarriers are null although the subcarriers are overlapping. Thus the total ...

OFDM Subcarrier The propagation delay (delay spread) introduced decreasing the coherence band, it degrades the system performance. Fig. 01 performance results for OFDM channel C with CP 0 5 10 15 20 25 30 10-3 10-2 10-1 10 0 Average Eb/No,dB e channal C withowt cp channal C with cp parameter value 8 * 500kHz = 4MHz Échantionnage factor J 8 ...