Performance Analysis of Zero-IF MIMO OFDM Transceivers with IQ Imbalance

Schenk, Tcw Tim; Fledderus, E.R.; Smulders, Pfm Peter

doi:10.4304/jcm.2.7.9-19

Cited by 48 publications

(41 citation statements)

References 17 publications

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“…Therefore, TX-only I/Q imbalance is more harmful than RX-only I/Q imbalance with respect to the average subcarrier SINR contrary to [9] where RX-only I/Q imbalance is more harmful than TX-only I/Q imbalance when BER is considered. When ergodic capacity is used as a performance metric a result similar to our result is observed in [10].…”

Section: Tx-only I/q Imbalancementioning

confidence: 47%

Exact SINR analysis of OFDM systems under joint Tx/RX I/Q imbalance

Özdemir

Hamila

Al-Dhahir³

2013

2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

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The direct-conversion architecture used for Orthogonal Frequency Division Multiplexing (OFDM) systems suffers from intercarrier interference (ICI) between image subcarriers in each OFDM symbol due to I/Q imbalance between the inphase (I) and quadrature (Q) branches at the transmit and receive sides. One of the widely-used metrics to evaluate the performance degradation due to I/Q imbalance is the signal to interference plus noise ratio (SINR). The instantaneous subcarrier SINR can be represented as a ratio conditioned on a particular channel realization and the exact SINR is evaluated by averaging over the channel realizations. In the literature, it is common to approximate the SINR by taking the average of the numerator and denominator separately although the two are not independent. In this paper, we calculate the exact SINR under the assumption that each pair of interfering subcarriers experiences uncorrelated channel realizations. We show that the SINR grows as the logarithm of the input SNR when the receiver has I/Q imbalance. On the other hand, under transmit-only I/Q imbalance, there is an SINR ceiling for large input SNR. Therefore, transmitter side I/Q imbalance is more harmful, in terms of average SINR, than receiver-only I/Q imbalance. We also show that, the approximate SINR expression, commonly used in the literature, is not accurate for large input SNR values, except for the case of transmit-only I/Q imbalance.

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Section: Tx-only I/q Imbalancementioning

confidence: 47%

Exact SINR analysis of OFDM systems under joint Tx/RX I/Q imbalance

Özdemir

Hamila

Al-Dhahir³

2013

2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

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“…Symmetrical or asymmetrical either can be modeled with I/Q imbalance. Equivalent representations will be there for both models [11]. We are working with the symmetrical model in this for this work.…”

Section: International Journal For Research In Applied Science and Engimentioning

confidence: 99%

A Review Paper on Analysis Of I/Q Imbalance and Impact of Timing Jitter and In OFDM Transmission Systems for ICI Reduction

Gawande¹

2017

IJRASET

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in the past years tremendous progress has been made on the ofdm (orthogonal frequency division multiplexing) communication model and its applications, although all this progress, still impairments like timing jitter and i/q imbalance have huge impact on the system performance . As orthogonal frequency division multiplexing (ofdm) is the high data rate systems has the problem of inter carrier interference (ici) and due to timing jitter and i/q imbalance system leads the performance as high bit error rate. Analyzing the interaction between timing jitter and i/q imbalance a new algorithm is propose which leads the extra ici terms in their interaction. Indication of analysis is that the inter carrier interference (ici) has equal real and imaginary components and is independent of received subcarrier index .due to the relative contribution on timing jitter and i/q imbalance its parameters values influences the inter carrier interference (ici), whereas i/q imbalance dominating when timing jitter is relatively small and timing jitter taking over for larger jitter values. Observation shows the negligible interaction for extra ici in all cases. Analytical results will compare with simulation results for minimum ber. Key words: -ofdm (orthogonal frequency division multiplexing),i/q imbalance, timing jitter, ici(inter carrier interference).

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“…If we for notational convenience renumber the subcarriers, the received MIMO signal vector for the kth data-conveying subcarrier can be written as [13]:…”

Section: A System Modelmentioning

confidence: 99%

“…For that purpose we derived closed-form expressions for the symbol-error rate (SER) for M -QAM symbols in a MIMO OFDM system impaired by IQ mismatch in [13].…”

Section: Impact On System Performancementioning

confidence: 99%

See 1 more Smart Citation

RF impairments in high-rate wireless systems - understanding the impact of TX/RX-asymmetry

Schenk

Fledderus

2008

2008 3rd International Symposium on Communications, Control and Signal Processing

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Abstract-Dealing with radio frequency (RF) front-end impairments will be one of the major design challenges for nextgeneration wireless communication systems due to conflicting requirements, such as high data rate, low cost and low power consumption. The use of digital compensation of the imperfections appears a very promising method to meet specifications. Pursuing that path, however, requires thorough understanding of the influence of the RF front-end non-idealities on the received signal and the resulting system performance.To this end, this paper reviews the impact of three important impairments, namely, phase noise, IQ imbalance and nonlinearities, on the performance of next-generation high-rate wireless systems. A specific focus is on the difference between transmitter (TX) and receiver (RX) incurred imperfections. Moreover, a generalized error model to capture to aggregate influence of different impairments is presented.

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Performance Analysis of Zero-IF MIMO OFDM Transceivers with IQ Imbalance

Cited by 48 publications

References 17 publications

Exact SINR analysis of OFDM systems under joint Tx/RX I/Q imbalance

Exact SINR analysis of OFDM systems under joint Tx/RX I/Q imbalance

A Review Paper on Analysis Of I/Q Imbalance and Impact of Timing Jitter and In OFDM Transmission Systems for ICI Reduction

RF impairments in high-rate wireless systems - understanding the impact of TX/RX-asymmetry

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