On I/Q imbalance effects in MIMO space-time coded transmission systems

Abstract

Throngh the introduction of mnltiple antennas in fut� wireless communications systems, the requirements for the power consumption, cost and size of indkidnal radia front ends become even more challenging than in the current single antenna systems. In tm'> cODten, the so called direct-conversion front-end architectm'e is of big interest for building compact ra

Performance impact of IQ mismatch in direct-conversion MIMO OFDM transceivers

“…Recently, the probability of bit error for SISO OFDM systems impaired by RX IQ imbalance was more accurately studied in [5]. The influence of IQ imbalance on the SIR performance of a space-time coded single-carrier system was treated, recently, in [4]. This paper extends previous work by considering the G2 I -1,…”

“…All simulations are carried out for an uncoded IEEE 802.11a-based MIMO system. It is assumed that the MIMO transfer is perfectly estimated, yielding the estimate expressed in (4). All figures presented in this section depict the analytical results by lines and the results from simulations by markers.…”

“…One of the disadvantages of direct-conversion transceivers is, however, that they can introduce considerable IQ imbalance [1][2][3][4].…”

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

“…Also, some recent papers, proposing digital compensation algorithms for IQ imbalance in MIMO OFDM systems [12][13][14][15], provide numerical results about the impact in MIMO OFDM systems. The influence of IQ imbalance on the SIR performance of a space-time coded singlecarrier system was treated in [10]. This paper, which is an expanded version of [1], extends previous work by analytically studying the performance impact of both TX and RX IQ imbalance in a space division multiplexing (SDM)-based MIMO OFDM system.…”

“…This paper will focus on the latter impairment which is caused by mutual differences in the used components for frequency translation. These differences result in a phase and amplitude imbalance between the I and Q signals, an effect which we will refer to as IQ imbalance [7][8][9][10].…”