In this paper, we propose smart step closed-loop power control (SSPC) algorithm and base station assignment based on minimizing the transmitter power (BSAMTP) technique in a direct sequence-code division multiple access (DS-CDMA) receiver in the presence of frequency-selective Rayleigh fading. This receiver consists of three stages. In the first stage, with conjugate gradient (CG) adaptive ...

Multiple access technologies based on Orthogonal Frequency Division Multiplexing (OFDM) yield evolutionary advantages for the next generation wireless communication systems. Wireless communication systems based on Orthogonal Frequency Division Multiple Access (OFDMA) increase channel capacity over broad bandwidth and improve the bandwidth efficiency. To maximally use resource in OFDMAbased wire...

This paper proposes a numerical method for characterizing the rate region achievable with frequency-division multiple access (FDMA) for a Gaussian multiple-access channel with intersymbol interference. The frequency spectrum is divided into discrete frequency bins and the discrete bin-assignment problem is shown to have a convex relaxation, making it tractable to numerical optimization algorith...

In the context of orthogonal frequency division multiplexing (OFDM), most papers define OFDM symbol synchronization as frame synchronization. In this paper, a frame is defined as a block of several OFDM symbols in the time dimension. The main contribution of this work is to propose a novel, lowcomplexity, frame synchronization method for multi-carrier systems that does not require any transmiss...

In this paper, transmit Beamforming (BF) for Space Division Multiple Access (SDMA) is studied in the downlink of wireless cellular systems based on Multi-Carrier Code Division Multiple Access (MC-CDMA). This combination allows a separation of users’ signals in space, thanks to BF, and frequency, thanks to CDMA, and thus improves mitigation of multiple access interference. We propose to perform ...

This deliverable aims at refining the definition of suitable multiple access schemes for the WINNER system concept. Simulations of WINNER I candidate multiple access schemes have been carried out in different evaluation scenarios defined by the Concept Group scenarios. Based on the insights from these simulations, reference design of multiple access schemes for frequency-adaptive and non-freque...

In the growth of fourth-generation mobile servicing, long` c ns term evolution (LTE) is an emanate technology. In LTE the downlink model build up on orthogonal frequency division multiple access (OFDMA) and the uplink arrangement build up on single carrier frequency division multiple access (SC-FDMA).In this paper we have tendency to derive the achievement of typical elemental differences betwe...

Abstract In direct sequence code division multiple access (DS-CDMA) and multi-carrier (MC)-CDMA, frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can be applied to exploit the channel frequency-selectivity and to improve bit error rate (BER) performance. In MC-CDMA uplink, however, the BER performance significantly degrades due to strong multi-user interfe...

Timing and frequency synchronizationsare the important tasks in receiver. In this paper, an efficient timing and carrier frequency offset (CFO) estimation algorithm for orthogonal frequency division multiple access/ time division duplexing (OFDMA/TDD) mode in IEEE 802.16-2004 standard (WiMAX) is represented. This method has high performance and jointly estimates timing error and CFO. The perfor...

This paper proposes a novel multiple access scheme, which is a combination of Inhibit Sense Multiple Access (ISMA) and Frequency Division Multiple Access (FDMA). Two types of the proposed protocol are considered. They are based on FDD and TDD modes. The performance of each hybrid protocol is evaluated in terms of throughput and the comparison of the proposed schemes and the pure ISMA scheme is ...