[PDF] Top 20 Cross-Validation Estimation for Frequency-Dependent I/Q Imbalance in MIMO-OFDM Receivers

... Manufactured in the United States Abstract The effects of variation in RF, such as I/Q imbalance and filter mismatch, are extremely important for OFDM wireless ... See full document

... Abstract—Variations in I/Q gains, phases, and filters of the RF frontend, namely frequency-dependent I/Q imbalance (FDI), are an important factor in ... See full document

... of estimation and compensation for both the transmitter and re- ceiver radio impairments in the MIMO-OFDM (multiple-input, multiple-output orthogonal frequency-division ... See full document

... V. I. I NTRODUCTION The combination of multi-input multi-output (MIMO) transmission, orthogonal frequency-division multiplexing (OFDM) technology, and space-time block code (STBC) ... See full document

... practice, frequency-dependent IQ-M and CFO arise ...the frequency-dependent IQ-M with ...the estimation of frequency- dependent IQ-M with ...preamble-assisted ... See full document

... typical OFDM system based on IEEE 802.11g for WLAN was adopted as a reference-design platform to evaluate the per- formance of the proposed ...employed in the simulation platform were OFDM ... See full document

... algorithm for systems us- ing four short training symbols; true CFO = ...the frequency estimator’s MSE performance when the SNR for each receive antenna is assumed to be per- fectly ...both ... See full document

... transmission in the channels with uneven frequency response, bit- loading algorithm is utilized to optimize the power weighting and format allocation of each OFDM ...2 MIMO wireless channel ... See full document

... According to the proposed iterative approaching algorithm, the global maximum of log-likelihood function can be definitely found to achieve both frequency and time synchronization[r] ... See full document

... technology for increasing the wireless channel capacity or reliability of mod- ern wireless communication systems [17], ...investigated for use in fiber-wireless systems ...employing MIMO is ... See full document

... words: MIMO-OFDM, PAPR, superimposed sequence, channel esti- mation, a ffine precoder ...Introduction MIMO-OFDM has proven to be the key enabler of high- speed, bandwidth efficient broadband ... See full document

... processing for the multi-carrier MIMO system if the MIMO dimension is very ...is for an matrix, and grows proportionally with the FFT size in the OFDM ...the MIMO ... See full document

... gapped OFDM, because all the data subcarriers are located clusterly at the other side far from the dc and would not fall into the “deep noise” region, the signal averagely has a higher ESNR and thus has a better ... See full document

... Subcarrier frequency allocation. B. Adaptive Frequency-Domain Channel Estimator ...subcarrier frequency allocation. Each OFDM symbol employs 64 subcarriers, 52 are data carriers while the rest ... See full document

... The channel transfer function of pilot tones are estimated by using low-rank MMSE estimator, and the channel transfer function of data tones are in- terpolated by piecewise l[r] ... See full document

... Doppler frequency of approximately 463 Hz when the carrier frequency is 5 GHz, we plot the corresponding MSE performance in ...the estimation performance is degraded due to the fact that the ... See full document

... channel estimation scheme for zero-padding (ZP) multiple- input multiple-output (MIMO)–orthogonal frequency division multiplexing (OFDM) ...the MIMO channel matrix taps can be ... See full document

... iterative receivers for OFDM and BICM/OFDM systems in doubly selective chan- ...algorithm for data detection, both receivers use groupwise processing with ICI cancellation ... See full document

... CFO estimation method for such ...function. In addi- tion to the standard calculations, this method requires an extra procedure to solve the roots of a polynomial function, which is disadvantageous ... See full document

... With its low hardware complexity and accurate estimation performance, the raised-cosine frequency- domain interpolation channel estimator will find many appli- cations in OFDM co[r] ... See full document