Error rate performance improvement for a decorrelating CDMA receiver by introducing additional dummy pilot response

Tomita, Mitsuhiro; Kuroyanagi, Noriyoshi; Ozawa, Satoru; Suehiro, N.

doi:10.1109/pimrc.2002.1047348

Cited by 3 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…That is, even if precise channel responses are given, a de-correlating matrix which is generally subjected to regularity reduction by the multipath waves, and sometimes by AWGN, causes a considerable increase in the bit error rate (BER). In order to solve this problem, the present paper introduces the concept of the virtual user and examines the effect of the virtual user in BER improvement [25][26][27][28][29][30]. In addition BER dependency on the singular value of the de-correlating matrix and the noise components on pilot response will be clarified.…”

Section: Introductionmentioning

confidence: 99%

A multi‐user CDMA receiver utilizing decorrelating detector with additional dummy pilot response

Tomita¹,

Kuroyanagi²,

Ozawa³

et al. 2003

Int J Communication

View full text Add to dashboard Cite

SUMMARYA pilot assisted CDMA system which uses extended spreading sequences with guard sequences under a quasi-synchronous condition is capable of separating the interference components included in the input of a de-correlating receiver by solving a system of linear equations. The performance of such a system, however, depends on the property of the de-correlating matrix consisting of the received pilots, which correspond to the respective user spreading sequences and the multi-path channel conditions. That is, the regularity of the matrix often tends to degrade, and the rank reduces occasionally primarily due to the multi-paths, resulting in solutions that are vulnerable to AWGN. The present paper proposes an effective technique to solve this problem by introducing a virtual user into a group of real users that are to be served. The simulation results indicate a remarkable improvement in the bit-error-rate (BER) performance. In addition, based on the BER performance, the system has a RAKE-like function that has power-sum characteristics.

show abstract

Section: Introductionmentioning

confidence: 99%