Frequency synchronization is a critical requirement for single-carrier frequency division multiple-access (SC-FDMA) uplink transmissions. Based on the key observation that the received signal at the base station can be formulated as the parallel factor analysis model, we present a joint carrier frequency offset (CFO) estimation and compensation scheme for SC-FDMA uplink transmissions with inter...

Coverage spectral efficiency (CSE) characterizes the tradeoff between efficient channel reuse and the achievable rates per cell, under the assumption of detection by a single base station and intra-cell FDMA. It is well known that intra-cell FDMA is not in general optimal. In this paper we study an alternative intracell wide-band scheme as well as the base station cooperation in detection, whic...

The paper presents Space-Frequency Block Coding (SFBC) as a transmit diversity technique in Single Carrier Frequency Division Multiple Access (SC-FDMA). SC-FDMA is known as a low Peak-to-Average Power Ratio (PAPR) modulation technique. SFBC requires changing the order of the samples in the frequency domain, which results in increase of the PAPR. Because of that, additional clipping and filterin...

|We compare CDMA and FDMA (or TDMA) schemes in multi-beam non-geostationary satellite systems, taking the e ects of antenna patterns on inter-cell interference into consideration. The maximum acceptable number of users per cell in uplink is employed as a measure of the system capacity. We have found that in FDMA (or TDMA) systems the maximum acceptable number of users varies according to the al...

ABSTARCTDFT spreading is one of the techniques introduced for peak to average power ratio (PAPR) reduction of OFDM systems. In this technique, the input signal with DFT is spreaded such that the PAPR is minimized but this can reduce the PAPR of OFDM signal to the level of single carrier transmission. In this paper, a DFT spreading method is proposed for the PAPR reduction of OFDM systems with s...

Long Term Evolution (LTE) is the most promising technology for 4G mobile communication networks. The goal of LTE is to provide high data transmission rate, scalable bandwidth, low latency, and high-mobility. LTE employs Orthogonal Frequency Division Multiplexing (OFDM) and Single Carrier Frequency Division Multiple Access (SC-FDMA) for downlink and uplink data transmission, respectively. As to ...

Orthogonal Frequency Division Multiplexing (OFDM) is one of the Strong candidate for Transmission of high data rate due to Multicarrier Modulation. One of the challenging Issue of OFDM is its high Peak to Average Power Ratio (PAPR) which cause large number of sub-carriers, that make restrictions for practical applications. This Paper discusses different PAPR Reduction techniques in OFDM. The Se...