VLSI Architectures for Multiuser Channel Estimation for W-CDMA Communication Systems
نویسندگان
چکیده
Future wireless communication base-station receivers need to use sophisticated algorithms to support extremely high data rates and multimedia. A direct implementation of these algorithms on DSPs fails to achieve real-time requirements. Therefore, these algorithms need to be modified for an architecturefriendly solution. Also, several features present in wireless communication algorithms, which can help meet real-time requirements, are not utilized effectively in DSPs. These features, such as bit level arithmetic and parallel structure, can be revealed and well exploited by decomposing the algorithm into different tasks that can be pipelined or done in parallel. Such a task partition not only helps in mapping the algorithm to hardware but also helps in establishing the theoretical performance limits of the algorithm in terms of minimum time requirements. We discuss different VLSI architectures for multiuser channel estimation, one of the core baseband processing operations in a wireless communication receiver. We modify the multiuser channel estimation algorithm, without sacrificing its error rate performance, to make it suitable for a computationally efficient fixed-point hardware implementation. We show the complexity and hardware required for three different area-time architecture tradeoffs; an areaconstrained, a time-constrained and an area-time efficient architecture. A large difference between the area and time constrained solutions reveals significant inherent parallelism in the algorithm. All custom VLSI solutions exhibit better time performance than a previous DSP implementation. By using such a custom-based VLSI architecture, it is feasible to implement the sophisticated baseband algorithms proposed for future wireless base-station receivers in real-time.
منابع مشابه
Real-time algorithms and architectures for multiuser channel estimation and detection in wireless base-station receivers
This paper presents algorithms and architecture designs that can meet real-time requirements of multiuser channel estimation and detection in future CDMA-based wireless base-station receivers. Sophisticated algorithms proposed to implement multiuser channel estimation and detection make their real-time implementation difficult on current Digital Signal Processor (DSP)-based receivers. A maximum...
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 کاملEfficient VLSI Architectures for Multiuser Channel Estimation in Wireless Base-Station Receivers
This paper presents a reduced-complexity, fixed-point algorithm and efficient real-time VLSI architectures for multiuser channel estimation, one of the core baseband processing operations in wireless base-station receivers for CDMA. Future wireless base-station receivers will need to use sophisticated algorithms to support extremely high data rates and multimedia. Current DSP implementations of...
متن کاملChannel estimation for DS-CDMA with aperiodic spreading codes
For high performance CDMA communications, multiuser detection is often required to suppress the multiple access interference (MAI). Most multiuser detectors rely on accurate channel information to recover the multiuser digital signals. This paper studies the blind channel estimation problem for DS-CDMA systems using aperiodic spreading codes. The Maximum Likelihood (ML) estimator is formulated ...
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 2000