Development of a novel spreading code generator for WCDMA rake receiver

Fazida Hanim Hashim, Masuri Othman, Mahamod Ismail

Research output: Contribution to journalArticle

Abstract

This paper describes a proposed spreading method to improve the Bit Error Rate (BER) and user capacity in WCDMA system using Rake receiver. The method is applied to the WCDMA system up-link. The spreading process includes a new proposed random matrix constructed using the Walsh code generator, called randmat spreading code generator. Conventionally, the selection of seed is highly dependable on the Spreading Factor (SF) of the system. This spreading factor has to be in the power of 2. However, by carefully selecting a variable n, to result in SF-n for the input seed to the Walsh code, the simulation results show that the BER can improve dramatically. The proposed multi-level modulation method could also increase the data rate and user capacity of the WCDMA system. In terms of hardware implementation, a Walsh-based code generator has an advantage of being able to be implemented using look-up table (LUT) cascade. The main advantages of LUT cascades are its short design time, easy implementation, little memory requirements and fast operational time.

Original languageEnglish
Pages (from-to)479-482
Number of pages4
JournalEuropean Journal of Scientific Research
Volume18
Issue number3
Publication statusPublished - 2007

Fingerprint

hyaluronate lyase
WCDMA
rakes
generators (equipment)
Bit error rate
Seed
Receiver
Generator
Look-up Table
Seeds
Cascade
Error Rate
Modulation
seeds
Hardware
seed
Data storage equipment
Uplink
Hardware Implementation
methodology

Keywords

  • Rake receiver
  • Spreading code
  • Walsh Code
  • WCDMA

ASJC Scopus subject areas

  • General

Cite this

Development of a novel spreading code generator for WCDMA rake receiver. / Hashim, Fazida Hanim; Othman, Masuri; Ismail, Mahamod.

In: European Journal of Scientific Research, Vol. 18, No. 3, 2007, p. 479-482.

Research output: Contribution to journalArticle

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