Maximum spectral utilization efficiency multi-code fixed spreading length (MFSL) multi-rate transmission scheme for MC-CDMA

Document Type

Conference Proceeding

Publication Date

12-1-2002

Abstract

In this paper, a new multi-rate transmission scheme for MC-CDMA system is proposed to achieve the maximum spectral utilization efficiency. In this scheme, all different rate users are designed to have the same processing gain and share the same set of sub-carriers, whose frequency spacing equals the lowest rate users bandwidth. With such sub-carrier assignment, due to the narrow bandwidth of each sub-carrier, flat fading on each sub-carrier can easily be obtained, which is essential for multi-carrier (MC) transmission [1]. Multi-code scheme [2,3] is used to convert the multi-rate system to an equivalent single lowest rate system by splitting a higher rate stream into a plurality of lowest rate streams and assigning each of them a different spreading code. Due to the improved spectral utilization efficiency, all lower rate users possess stronger interference suppression capability than in the uncoded fixed spreading length (UFSL)[4] and coded FSL (CFSL) scheme [5], particularly in the high interference region. The bit error rate (BER) performance versus signal-to-noise ratio (SNR) per bit and interference-to-signal ratio (ISR) are compared with the UFSL and block coded FSL (BCFSL) scheme by simulation in a correlated Rayleigh fading channel.

Identifier

6344231721 (Scopus)

Publication Title

Proceedings 2002 International Conference on Third Generation Wireless and Beyond Key Function of World Wireless Congress

First Page

587

Last Page

591

This document is currently not available here.

Share

COinS