A Cordic Based Reconfigurable Cdma Equalizer for Long Codes and Its Comparison to the Rake Receiver
نویسندگان
چکیده
FIR This paper presents the implementation of a solely Cordic based linear equalizer for CDMA (including descrambling and dispreading) on a software defined architecture. The performance of this approach is compared to the Rake receiver. We formulate the different detection concepts in a common matrix notation and discuss their performance in an UTRA-FDD environment. Simulations confirm the presented results. Figure 1: Software defined baseband processing for WLAN and UTRA using the RACE accelerator
منابع مشابه
A performance adjustable and reconfigurable CDMA receiver concept for UMTS-FDD
Currently most of the terminals for UMTS-FDD implement a simple Rake receiver. This paper shows how the Rake, including despreading and descrambling, could be replaced by a least squares receiver that can be implemented on a Cordic based hardware architecture. The performance in conjunction with the computational requirements of the receiver is widely adjustable. Simulation results show that th...
متن کاملMAI-suppression with fractional T-equalizer for CDMA
Wideband CDMA systems with orthogonal spreading codes suffer severely due to the loss of orthogonality by multipath propagation. This yields Multiple Access Interference (MAI) which gravely reduces the performance of classical systems with Rake-receivers. In our approach we attempt to restore orthogonality again by using a fractional T-equalizer. The results are compared with a system using the...
متن کاملJoint Closed-Loop Power Control and Base Station Assignment for DS-CDMA Receiver in Multipath Fading Channel with Adaptive Beamforming Method
In this paper, we propose smart step closed-loop power control (SSPC) algorithm and base station assignment based on minimizing the transmitter power (BSAMTP) technique in a direct sequence-code division multiple access (DS-CDMA) receiver in the presence of frequency-selective Rayleigh fading. This receiver consists of three stages. In the first stage, with conjugate gradient (CG) adaptive ...
متن کاملChip Level Decision Feedback Equalizer for CDMA Downlink Channel
In most commercial wideband code division multiple access (W-CDMA) systems, the transmitted signal in the downlink channel is spread by orthogonal codes to accommodate different users. However, frequency selective fading destroys the orthogonality and causes multiple access interference (MAI). The rake receiver has been proposed for a receiver in the downlink channel. Although providing reasona...
متن کاملA hybrid equalizer/Rake receiver for the Wideband CDMA Downlink in large delay spread channels
Signals transmitted over a multi-path propagation channel exhibit Inter-Path Interference (IPI) and fading. The receiver has to employ measures to mitigate these effects or it will incur severe performance degradation. A classic approach in Code Division Multiple Access (CDMA) communications is the Rake receiver. Alternatively, a Linear Minimum Mean Square Error (LMMSE) equalizer can further im...
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