Frequency domain soft-constraint multimodulus blind equalization for uplink SC-FDMA

Abstract

Single-carrier frequency division multiple access (SC-FDMA) has been adopted and employed as the standard in the 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) uplink multiple-access scheme. It offers comparable performance and complexity to orthogonal frequency multiple access scheme (OFDMA) with a lower peak to average power ratio (PAPR) offering power-efficient transmission and longer battery life to mobile terminals. However, due to its single-carrier nature, SC-FDMA performance degrades in channels with long impulse responses and becomes prohibitive to equalize when implemented in time domain (TD). Furthermore, of the seven SC-FDMA symbols in the LTE uplink slot, one full symbol is used for channel estimation leading to about 14 % throughput degradation. In this work, a novel frequency domain soft-constraint satisfaction multimodulus blind algorithm (FDSCS-MMA) is developed and proposed. The frequency domain approach results in computational complexity reduction while blind implementation ensured improved spectral efficiency and throughput. The algorithm convergence is further improved by normalization of each of the frequency bin in the weight update. Simulation results show superior performance of the developed algorithm over other blind algorithms.

Intersymbol interference resilient interleaving architecture for multi‐stream interleaved frequency division multiple access system

“…Furthermore, the problem of ISI can be compensated through adaptive equalization. A frequency‐domain approach for IFDMA using a soft constraint multi‐modulus blind algorithm is described 16 . The algorithm optimizes the ISI and efficiently restores the carrier phase compared to other blind algorithms, namely, constant modulus and multi‐modulus algorithms.…”

“…A frequencydomain approach for IFDMA using a soft constraint multi-modulus blind algorithm is described. 16 The algorithm optimizes the ISI and efficiently restores the carrier phase compared to other blind algorithms, namely, constant modulus and multi-modulus algorithms. An iterative equalization technique with multiuser interference cancelation and detection is proposed by Sanoopkumar et al 17 The equalization algorithm mitigates the interference caused by transmitter and receiver in-phase/quadrature (IQ) imbalance, CFO, and doubly selective channel in the SC-FDMA system.…”