Ah.strwt-ln this paper, we study the code assignment problem in High Speed Downlink Packet Access (HSDPA) Networks. L n HSDPA, the spreading factor of codes is fixed at 16, and the maximum number of bits reserved for code assignment transmitted on the control channel is limited to 64 bits. This high control overhead may lead to inefficiencies in HSDPA systems when the number of mobile nodes in ...

Smart antennas, with spatial processing, used in code division multiple access (CDMA) multiuser communications can enhance range, reliability and capacity. Moreover, the adaptive beamforming technologies can remove unwanted noise and jamming from the received signal. In this paper, we use least mean square algorithm and propose four adaptive antenna receiver structures for directsequence (DS) C...

Spreading-Interleaved Frequency Division Multiple Access (IFDMA) providing code domain multiplexing for one IFDMA channel shows improved spectrum efficiency and good compatibility with CDMA systems while maintaining advantages of IFDMA systems. A generalized Rake receiver for Spreading-IFDMA is proposed in this paper, which combines jointly derepetition, equalization, and de-spreading processin...

in this paper a discrete big bang-big crunch algorithm is applied to optimal design of reinforced concrete planar frames under the gravity and lateral loads. optimization is based on aci 318-08 code. columns are assumed to resist axial loads and bending moments, while beams resist only bending moments. second-order effects are also considered for the compression members, and columns are checked...

In this paper, we evaluate by computer simulations the throughput performance of rate compatible punctured turbo coded hybrid ARQ (RCPT HARQ) for direct sequence code division multiple access (DS-CDMA) with antenna diversity reception and rake combining in a frequency selective Rayleigh fading channel. The impact of a range of transmission system parameters and propagation parameters (viz.: the...

We demonstrate the spreading of femtosecond optical pulses into picosecond-duration pseudonoise bursts. Spreading is accomplished by encoding pseudorandom binary phase codes onto the optical frequency spectrum. Subsequent decoding of the spectral phases restores the original pulse. We propose that frequency-domain encoding and decoding of coherent ultrashort pulses could form the basis for a ra...

Blind channel identiication techniques based on second order statistics are investigated for multiuser systems employing Direct-Sequence/Code-Division Multiple-Access (DS/CDMA). The methods exploit knowledge of the spreading code of the user of interest via matched ltering, as well as properties of spreading codes. Two schemes are presented: one for deterministic short sequence DS/CDMA and a me...

This paper addresses an important issue on the spreading bandwidth of direct sequence code division multiple access (DS-CDMA) cellular mobile radio systems: does wider spreading bandwidth provide larger capacity? And if so, to what extent? The capacity of the perfect power controlled reverse link is evaluated by computer simulation for 1.25MHz and 5MHz spreading bandwidths under various sets of...