Exact average OFDM subcarrier SINR analysis under joint transmit-receive I/Q imbalance
Author | Ozdemir, Ozgur |
Author | Hamila, Ridha |
Author | Al-Dhahir, Naofal |
Available date | 2016-02-08T14:21:27Z |
Publication Date | 2014-10 |
Publication Name | IEEE Transactions on Vehicular Technology |
Resource | Scopus |
Citation | Ozdemir, O., Hamila, R., Al-Dhahir, N. "Exact average OFDM subcarrier SINR analysis under joint transmit-receive I/Q imbalance." (2014) IEEE Transactions on Vehicular Technology, 63 (8), art. no. 6732973, pp. 4125-4130. |
ISSN | 0018-9545 |
Abstract | The subcarrier signal-to-interference-plus-noise ratio (SINR) expression for orthogonal frequency-division multiplexing (OFDM) systems impaired by in-phase/quadrature (I/Q) imbalance is a ratio of correlated random variables. In its original form, a quadruple integral is required to evaluate the exact average subcarrier SINR, which is cumbersome to compute numerically. We show that the quadruple integral can be reduced to a single integral, which can be easily evaluated numerically. Furthermore, closed-form expressions are derived for several important special cases, including transmit (TX)-only I/Q imbalance, receive (RX)-only I/Q imbalance, and joint TX/RX I/Q imbalance with equal levels of I/Q imbalance at the transmitter and at the receiver. In addition, we derive high-input-SNR approximations that provide valuable insights on how the average SINR is affected by the I/Q imbalance levels at the transmitter and the receiver and by the channel correlation between the image OFDM subcarriers. For example, we show that at high input SNR, TX-only I/Q imbalance is more harmful, in terms of average subcarrier SINR, than RX-only I/Q imbalance. Furthermore, we show that an approximate OFDM subcarrier SINR expression, commonly used in the literature, is not accurate when RX I/Q imbalance is present. |
Sponsor | Qatar National Research Fund under Grant NPRP 09-062-2-035. |
Language | en |
Publisher | IEEE |
Subject | In-phase/quadrature (I/Q) Imbalance orthogonal frequency-division multiplexing (OFDM) signal-to-interference-plusnoise ratio (SINR) |
Type | Article |
Pagination | 4125-4130 |
Issue Number | 8 |
Volume Number | 63 |
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Electrical Engineering [2611 items ]