Receiver design for multicarrier transmission systems in presence of Tx/Rx imperfections

Abstract

The aim of this article is to design a simple receiver, which can jointly estimate the frequency selective channel impulse response, frequency independent transmit/receive IQ imbalance, and carrier frequency offset with minimal training and implementation complexity. The estimation of carrier frequency offset is performed using 2 scalable solutions. To estimate the frequency selective channel impulse response and frequency independent transmit/receive IQ imbalance, we proposed 2 different estimation techniques. The first technique is an iterative approach stemming from a doubly linear model of the transmission system in the presence of transmit/receive IQ imbalance and frequency selective channel impulse response, while the second approach is a least squares solution. Both these schemes provide a good performance/complexity trade-off. Although the iterative estimates of channel impulse response are not optimal, they do provide a near ideal bit error performance. The proposed scheme blends seamlessly with Institute of Electrical and Electronics Engineers 802.11 standard but can be adapted to work with any orthogonal frequency-division multiplexing standard. KEYWORDSCFO and IQ imbalance estimation, direct conversion devices, multicarrier systems 1 Int J Commun Syst. 2017;30:e3277. wileyonlinelibrary.com/journal/dac How to cite this article: Ali MA, Sandhu MY, Waqar O, Rahimo AQ. Receiver design for multicarrier transmission systems in presence of Tx/Rx imperfections. Int J Commun Syst. 2017;30:e3277.

Digital Pre-Distortion of Carrier Frequency Offset for Reliable Wi-Fi Enabled IoTs

“…Many studies have been done to provide reliable communication links to users in IEEE 802.11 standards [15][16][17][18]. In the conventional wireless devices, a CFO is estimated by a unit of a packet using a preamble located at a header of a data packet transmitted through a wireless channel in an OFDM wireless communication system [17,18].…”

“…In the conventional wireless devices, a CFO is estimated by a unit of a packet using a preamble located at a header of a data packet transmitted through a wireless channel in an OFDM wireless communication system [17,18]. The conventional wireless systems compensate the CFO by estimating the CFO based on the received frames at the receiver.…”

BER analysis and interference mitigation for GO‐OFDMA transmission

“…Effect of CFO in different schemes had been investigated in previous literature. [2][3][4][5][6][7][8] One way is to use multiuser detection (MUD). But MUD is relatively complex that imposes computational as well as power burden on the receiver and its complexity increases with the number of users.…”