Effect of Time Diversity on the Forward Link of the DS-CDMA CellularSystem
A direct-sequences code division multiple access system has been accepted as a digital cellular standard (IS–95) in North America [1]. This digital cellular standard employs a powerful rate 1/2, constraint length 9, convolutional code in its forward link. It ...
Performance of a CDMA System with an Adaptive Receiver and a New Familyof Complex Valued Spreading Sequences
This paper presents the results of a capacity evaluation for a direct-sequence (DS), code-division, multiple access (CDMA) system over both an additive white Gaussian noise (AWGN) channel and a Rayleigh fading channel. The system considered uses an ...
Minimum Duration Outage for CDMA Cellular Systems: A Level Crossing Analysis
Traditionally, outage for CDMA cellular systems has been defined as the signal level (or, more precisely, the signal-to-interference ratio (SIR)) falling below a required threshold. In real cellular environments, it is not the instantaneous drop of the ...
Adaptive Antennas for Microcellular and Mixed Cell Environments withDS-CDMA
Adaptive antenna technology is now regarded as one of the key system components in future generation cellular networks. This paper considers the performance of a DS-CDMA system which employs adaptive antennas at the base station sites of both microcell and ...
Parallel Interference Cancellation in Multiuser CDMA ChannelEstimation
Parallel interference cancellation (PIC) based channel parameter estimators for frequency selective fading channels are proposed for the uplink in code-division multiple-access (CDMA) mobile communication systems. The performance of PIC based algorithms ...
Throughput Analysis of a Decentralized RLAN Based onAsynchronous DS/CDMA Using Random Periodic Spreading Sequences
Packet throughput figures are obtained for a decentralized radio local area network (RLAN) which is based on asynchronous direct-sequence code-division multiple-access (DS/CDMA). Packets arrive at the receiver nodes with different power levels. ...
Commutation Signaling to Combat ISI over Nakagami and Ricean Fading
Bandwidth expanding signaling with quasi-orthogonal short codes is considered. The evaluation of the average probability of error analytically and by simulation is presented, for channels with multipath induced intersymbol interference (ISI) and for two ...
The Performance of Space-Time Processing for Suppressing NarrowbandInterference in CDMA Communications
The requirement to suppress narrowband interferences in CDMA communications stems from the overlay concept, i.e., coexistence of different types of signals in the same frequency band. The conventional approach to rejecting the narrowband interferences has ...
Low-Complexity Performance Evaluation of Binary and Quaternary DS-SSMAover Rician Fading Channels via the Characteristic Function Method
This paper presents an efficient and accurate performance evaluation technique for binary and quaternary direct-sequence spread-spectrum multiple-access (DS-SSMA) systems with deterministic signature sequences over Rician fading channels, without resorting ...
Downlink Design for a Wideband DS-CDMA Demonstrator
DS-CDMA is recognised as one of the foremost mobile radio access techniques today. However, to date, there has been scant information on the system implementation and the many problems facing radio engineers. In this contribution, the design of the downlink (...