Code Division Multiple Access (CDMA) has gained widespread international acceptance by cellular radio system operators as an upgrade that will dramatically increase both their system capacity and the service quality. CDMA is a "spread spectrum" technology, allowing many users to occupy the same time and frequency allocations in a given band/space. As its name implies, CDMA (Code Division Multip...

The frequencyand time-domain expressions are derived for the signal-to-noise power ratio (SNR) of an ideal Rake combiner output in a direct sequence spread spectrum (DSSS) mobile communication system. The derived SNR expressions make it possible to estimate the SNR statistics after Rake combining for an arbitrary spreading chip rate in the frequencyselective multipath channel. key words: spread...

Although spread spectrum systems depend on large bandwidth to achieve performance, they must also operate within bandwidth constraints imposed by frequency allocations. The measures of bandwidth relevant to performance are usually quite different from those defined in frequency allocations. In this paper a number of definitions of bandwidth are discussed, and a number of direct sequence pseudon...

Narrowband Interference Suppression in Spread Spectrum CDMA H. Vincent Poor, Leslie A. Rusch Code-division multiple-access (CDMA) implemented with direct-sequence spread spectrum signaling is among the most promising multiplexing technologies for cellular telecommunications services, such as personal communications, mobile telephony, and indoor wireless networks [1, 2, 3, 4, 5]. The advantages ...

The performance of various cellular planning methods for GSM, which decrease co-channel interference without sacrificing traffic capacity, is evaluated. For measuring the advantages of each method, the Carrier-to-Interference Ratio, is calculated. The use of different clusters and the benefits of sectorisation in C/I are studied. An evaluation of the influence of Frequency Hopping on C/I is als...

Smart antenna is considered as one of the most effective means for enhancing wireless system capacity. When fractional loading is accompanied with slow-frequency hopping (SFH), soft capacity can be realized in time-division multiple access (TDMA) wireless networks. Then, the interference reduction due to smart antennas, power control, and discontinuous transmission can be directly translated in...

In this paper, we propose a low complexity receiver structure for Single-input Multiple-output (SIMO) downlink cyclic prefix CDMA (CP-CDMA) systems. It employs an interference cancellation scheme to suppress the interference caused by the multipath fading channel. Also, the proposed scheme is developed for Multiple-input Multiple-output (MIMO) CP-CDMA system. All filters in the proposed receive...

This paper summarizes recent contributions on the transmission capacity of ad hoc networks. Although it is notoriously difficult to derive general end-to-end capacity results for ad hoc networks, the transmission capacity framework allows for quantification of achievable single-hop rates by focusing on a simplified physical/MAC-layer model. By using stochastic geometry to quantify the multi-use...

A new method is proposed to achieve a multirate overlapped code division multiple access system (OV-CDMA) based on a novel code overlapping procedure. The signal-to-interference ratio (SIR) performance has been investigated for such system. A channel model that allows multirate overlapped transmission is presented based on which a closed form solution for the SIR has been derived. In addition, ...