Localized or Interleaved? A Tradeoff between Diversity and CFO Interference in Multipath Channels

Carrier frequency offset (CFO) damages the orthogonality between sub-carriers and thus causes multiuser interference in uplink OFDMA/SC-FDMA systems. For a given CFO, such multiuser interference is mainly dictated by channel (sub-carrier) allocation, which also specifies the diversity gain of one us...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on wireless communications 2011-09, Vol.10 (9), p.2829-2834
Main Authors: Song, S. H., Chen, G. L., Letaief, K. B.
Format: Article
Language:English
Subjects:
Allocations
Applied sciences
Carrier frequencies
carrier frequency offset
Channel allocation
Channels
Damage
Detection, estimation, filtering, equalization, prediction
diversity gain
Diversity methods
Exact sciences and technology
Frequency diversity
Frequency division multiaccess
Gain
Information, signal and communications theory
Interference
Multipath channels
Multiplexing
OFDMA
Organization, operation and development plans
Orthogonality
Radiocommunications
SC-FDMA
Signal and communications theory
Signal to noise ratio
Signal, noise
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Wireless communication
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Carrier frequency offset (CFO) damages the orthogonality between sub-carriers and thus causes multiuser interference in uplink OFDMA/SC-FDMA systems. For a given CFO, such multiuser interference is mainly dictated by channel (sub-carrier) allocation, which also specifies the diversity gain of one user over multi-path channels. In particular, the positions of one user's sub-channels will determine its diversity gain, while the distances between sub-channels of the concerned user and those of others will govern the CFO interference. Two popular channel allocation methods are the localized and interleaved (distributed) schemes where the former has less CFO interference but the latter achieves more diversity gain. In this paper, we will consider the channel allocation scheme for uplink LTE systems by investigating the effects of channel allocation on both of the diversity gain and CFO interference. By combining these two effects, we will propose a semi-interleaved scheme, which achieves full diversity gain with minimum CFO interference.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2011.071411.102321