I/Q imbalance in multiple beamforming {OFDM} transceivers: SINR analysis and digital baseband compensation
Author | Özdemir, Özgür |
Author | Hamila, Ridha |
Author | Al-Dhahir, Naofal |
Available date | 2023-04-04T09:09:10Z |
Publication Date | 2013 |
Publication Name | IEEE Transactions on Communications |
Resource | Scopus |
Abstract | In this paper, we start by investigating the impact of joint transmit-receive I/Q imbalance on the performance of direct-conversion beamforming OFDM transceivers. We derive a new analytical expression for the average subcarrier SINR of the I/Q imbalance-ignorant beamformer in terms of the I/Q imbalance level at both the transmit and receive sides, the size of the beamforming array, and the input SNR level. This expression motivates the need for I/Q imbalance compensation and provides valuable design insights when examining several special and limiting cases. Next, we derive the throughput-maximizing multiple beamforming transmit/receive coefficients under a general system model with an asymmetric frequency-dependent (FD) joint transmit-receive I/Q imbalance. In addition, we propose a low-complexity pilot-aided scheme for the estimation of the channel and I/Q imbalance parameters. Our simulation results demonstrate that the proposed generalized multiple beamforming scheme is highly effective in mitigating I/Q imbalance effects at practical complexity levels. 2013 IEEE. |
Language | en |
Publisher | IEEE |
Subject | I/Q imbalance MIMO Multiple beamforming OFDM SINR |
Type | Article |
Pagination | 1914-1925 |
Issue Number | 5 |
Volume Number | 61 |
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Electrical Engineering [2649 items ]