Performance of LMMSE receivers in broadband communication systems

Author

Kokate, M.D. ; Sontakke, T.R.

Author_Institution

E&TC Dept., K.K. Wagh Inst. of Eng. Educ. & Res., Nashik, India

fYear

2013

fDate

4-6 July 2013

Firstpage

1

Lastpage

6

Abstract

DS-CDMA featuring asynchronous multiple access, robustness to frequency selective fading and multipath combining is chosen as air interface standard in WCDMA. WCDMA works with 5MHz and chip rate of 3.84Mcps. As it supports variable spreading factor to achieve flexible data rate, during high transmission rate uses short spreading code. But users with these smaller spreading codes may experience inter-path interference (IPI) as it exhibits poor correlation. Even today, to exploit receive diversity, RAKE receiver is used as a front end in CDMA systems. The interference becomes a limiting factor for the performance of conventional RAKE receivers. In this paper LMMSE estimator and MSE of error covariance matrix is derived with different optimization criterion is discussed.

Keywords

code division multiple access; covariance matrices; fading; least mean squares methods; optimisation; radio receivers; radiofrequency interference; spread spectrum communication; DS-CDMA; IPI; LMMSE receiver; MSE; RAKE receiver; WCDMA; asynchronous multiple access; broadband communication system; covariance matrix; frequency 5 MHz; frequency selective fading; interpath interference; short spreading code; Correlation; Covariance matrices; Fading; MIMO; Multiaccess communication; Receivers; Vectors; Diversity; LMMSE; MRC; RAKE; WCDMA;

fLanguage

English

Publisher

ieee

Conference_Titel

Computing, Communications and Networking Technologies (ICCCNT),2013 Fourth International Conference on

Conference_Location

Tiruchengode

Print_ISBN

978-1-4799-3925-1

Type

conf

DOI

10.1109/ICCCNT.2013.6726827

Filename

6726827