Efficient receiver algorithms for DFT-spread OFDM systems

For the 3GPP LTE uplink transmissions, the DFTspread OFDM technique has been adopted as the air interface in order to reduce the peak-to-average-power ratio (PAPR). In this scheme, each data symbol is spread over many tones by a discrete Fourier transform (DFT) operation at the transmitter before be...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on wireless communications 2009-06, Vol.8 (6), p.3216-3225
Main Authors: Prasad, N., Shuangquan Wang, Xiaodong Wang
Format: Article
Language:English
Subjects:
Antenna arrays
Applied sciences
Base stations
Decision feedback equalizers
Demodulators
DFT-spread OFDM
Discrete Fourier transforms
Equalization
Equipments and installations
Exact sciences and technology
Filters
Fourier transforms
Gain
Information, signal and communications theory
interference suppression
Inverse
linear filter
log likelihood ratio
MIMO
Mobile radiocommunication systems
Modulators
Multiaccess communication
Multiplexing
OFDM
OFDMA
Orthogonal Frequency Division Multiplexing
Peak to average power ratio
Radiocommunications
Receivers
SDMA
Signal and communications theory
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Transmitters
Transmitters. Receivers
Wireless networks
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:For the 3GPP LTE uplink transmissions, the DFTspread OFDM technique has been adopted as the air interface in order to reduce the peak-to-average-power ratio (PAPR). In this scheme, each data symbol is spread over many tones by a discrete Fourier transform (DFT) operation at the transmitter before being sent to the orthogonal frequency division multiplexing (OFDM) modulator. Moreover, more than one user can be scheduled over the same frequency and time resource block (RB) via space-division multiple-access (SDMA). The conventional receiver technique for such DFT-spread OFDM systems involves tone-by-tone single-tap equalization followed by an inverse DFT operation. In this paper, we propose a more powerful receiver technique for DFT-spread OFDM systems that consists of an efficient linear pre-filter and a two-symbol soft output demodulator. The proposed method can be applied to both single-user per RB (DFT-S-OFDMA) and multiple users per RB (DFT-S-OFDMSDMA) systems and it offers significant performance gains over the conventional method, especially in the high-rate regime, with little attendant increase in computational complexity.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2009.080941