A Linearly Constrained IQRD-RLS Algorithm for Blind Multiuser Detection in CDMA Systems

نویسندگان

  • César A. Medina
  • Raimundo Sampaio-Neto
چکیده

In this paper we propose an inverse QR decomposition based recursive least squares algorithm (IQRD-RLS) for the linearly constrained minimum variance (LCMV) receiver for CDMA transmission systems. The proposed algorithm is numerically stable in finite precision environments and it is suitable for implementation in systolic arrays or DSP vector architectures. It is shown through computer simulations that the proposed algorithm outperforms, in terms of bit error rate, previously proposed IQRD-RLS based blind detection algorithms.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Nonlinear 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 کامل

Constrained Adaptive Constant Modulus RLS Algorithm for Blind DS-CDMA Multiuser Receiver under Time-Varying Channels

The performance of the blind multiuser detector for a DSCDMA system with linearly constrained constant modulus (LCCM) criterion is known to highly depend on the exact knowledge of the desired user amplitude; it is usually not available at receiver end. In this paper, we propose a novel LC adaptive CM RLS (LC-ACM-RLS) algorithm to adaptively implement the optimal solution of the LCCM receiver, a...

متن کامل

Multiuser wavelet based MC-CDMA receiver with linearly constrained constant modulus IQRD-RLS algorithm

In this paper, a new robust linearly constrained constant modulus (LCCM) approach with inverse QRD-RLS algorithm is derived and applied to the multi-carrier code division multiple access (MC-CDMA) system. The proposed algorithm can be employed to reduce the MA1 efficiently, due to other users and combat the mismatch problem, when channel parameters could not be estimated perfectly. We show that...

متن کامل

Adaptive Multiuser Detection and Beamforming for Interference Suppression in CDMA Mobile Radio Systems

This paper considers the problem of interference suppression in direct-sequence code-division multiple-access (DSCDMA) systems over fading channels. An adaptive array receiver is presented which integrates multiuser detection, beamforming, and RAKE reception to mitigate cochannel interference and fading. The adaptive multiuser detector is formulated using a blind constrained energy minimization...

متن کامل

Code-Constrained Blind Multiuser Detection of Asynchronous CDMA Signals in Multipath Channels with CMA Equalization

Abslracf-In this paper, we consider the blind multiuser detection problem for asynchronous CDMA systems operating in a multipath environment. Using only the spreading code of the desired user, we first mitigate the effect of multiple access interference (MAI) while employing the constrained optimization. The constant modulus algorithm (CMA) is then applied to reliably recover the transmitted in...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2010