Wideband DS-CDMA for Next-Generation Mobile Communications Systems - IEEE Communications Magazine
نویسندگان
چکیده
Wideband wireless access based on direct sequence code diviABSTRACT sion multiple access aimed at third-generation mobile communications systems is reviewed. W-CDMA is designed to flexibly offer wideband services which cannot be provided by present cellular systems, wi th various data rates as high as 2 Mb/s. The important concept of W-CDMA is the introduction of intercell asynchronous operation
منابع مشابه
Bit Error Performance for Asynchronous Ds Cdma Systems Over Multipath Rayleigh Fading Channels (RESEARCH NOTE)
In recent years, there has been considerable interest in the use of CDMA in mobile communications. Bit error rate is one of the most important parameters in the evaluation of CDMA systems. In this paper, we develop a technique to find an accurate approximation to the probability of bit error for asynchronous direct–sequence code division multiple–access (DS/CDMA) systems by modeling the multipl...
متن کاملSlow frequency-hopping multicarrier DS-CDMA for transmission over Nakagami multipath fading channels
A novel multiple access scheme based on slow frequency hopping multicarrier direct-sequence code division multiple access (SFH/MC DS-CDMA) is proposed and investigated, which can be rendered compatible with the existing second-generation narrowband CDMA and third-generation wideband CDMA systems. The frequency hopping patterns are controlled by a set of constant-weight codes. Consequently, mult...
متن کاملNonlinear Multiuser Receiver for Optimized Chaos-Based DS-CDMA Systems
Chaos based communications have drawn increasing attention over the past years. Chaotic signals are derived from non-linear dynamic systems. They are aperiodic, broadband and deterministic signals that appear random in the time domain. Because of these properties, chaotic signals have been proposed to generate spreading sequences for wide-band secure communication recently. Like conventional DS...
متن کاملOn the spectral efficiency of wideband CDMA systems
The reverse-link spectral efficiency is evaluated for a direct-sequence (DS) code division multiple access (CDMA) cellular communication system that employs rapid closed-loop power control and coding with interleaving on channels that exhibit doubly selective Rician fading. The focus of the paper is the effect of the chip rate of the DS spread-spectrum signal on the spectral efficiency of the s...
متن کاملPerformance Comparison between Mc-cdma and Ds-cdma Systems for Awgn and Rayleigh Fading Channel
The latest technology in cellular mobile communication systems has become more demanding for better quality of service. It requires broad bandwidth for huge data transfer. In this paper, we compare the performance of Direct Sequence Code Division Multiple Access (DS-CDMA) and MultiCarrier Code Division Multiple Access (MC-CDMA) which are the major contenders for the next generation wireless sig...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004