Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) technique has gained increasing popularity in both wired and wireless communication systems. However, in the conventional OFDM systems the insertion of a cyclic prefix (CP) and the transmission of periodic training sequences for purpose of channel estimation decrease the system's spectral efficiency. As an alternative to OFDM, isotropic orthogonal transform algorithm (IOTA) based multicarrier system adopts a proper pulse shaping with good time and frequency localization properties to avoid interference and maintain orthogonality in real field among sub-carriers without the use of CP. In this paper, we propose linearly precoded IOTA based multicarrier systems to achieve blind channel estimation by utilizing the structure of auto-correlation and cross-correlation matrices introduced by precoding. The results 1 show that the proposed IOTA based multicarrier systems achieve better power and spectral efficiency compared to the conventional OFDM systems.

Analysis of Candidate Waveforms for 5G Cellular Systems

“…To comply with the real orthogonality principle, offset-QAM (OQAM) can be applied and, therefore, FBMC is not orthogonal in the complex domain. The most common FBMC technique is the FBMC/OQAM, which is also known as OFDM with offset quadrature amplitude modulation (OFDM/OQAM ) [10].…”

“…Receiver complexity is derived based on the complexity of 2N point FFT operation performed at the UFMC receiver [2]. Complexity of FBMC is based on real multiplications required for filter, frequency shifting and FFT and IFFT operations in FBMC transceiver [10]. Complexity of GFDM is based on the low complexity transceiver architecture given in [7] in addition to the MN point FFT and IFFT operations required at the GFDM receiver to enable 1-tap FDE.…”

Cognitive Radio Systems: Multicarrier Modulation and Power Allocation Challenges

“…Interference cancellation techniques are required to minimize mutual access interference, which significantly increases the receiver's complexity. On contrary, the situation is less severe in FBMC system as it uses near perfect filters, thus, avoiding the need for any interference cancellation techniques [3,15].…”

Single-rate and multi-rate multi-service systems for next generation and beyond communications

“…Orthogonal frequency division multiplexing (OFDM) [6] is NOT suitable for this MS system due to the high ISBI caused by its high out of band (OoB) emission level. Several new waveforms are proposed to address the problem, such as universal filtered multi-carrier (UFMC) [3], [7], [8], [9], [10], filtered OFDM (f-OFDM) [4], [11], filter bank multi-carrier (FBMC) [12], [13], [14] and generalized frequency division multiplexing (GFDM) [15], etc.…”