Modems White Papers
PAPR Reduction in OFDM Systems Using Constellation Shaping
Overview Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier transmission technique, which is widely adopted in different communication applications. OFDM prevents Inter Symbol Interference (ISI) by inserting a guard interval and mitigates the frequency selectivity of a multi-path channel by using a simple equalizer. This simplifies the design of the receiver and leads to inexpensive hardware implementations. In systems with a high-speed transmission of data, large delay spreads can seriously limit the system performance due to ISI. Moreover, OFDM offers some advantages in higher order modulations and in the networking operation that position OFDM as the technique of choice for the next generation of wireless networks.
| Publisher | University of Waterloo | File Format | |
|---|---|---|---|
| Date Published | July 2007 | Downloads | 7 |
| Format | White Papers | ||
| Topics | |||
-
Did you find this white paper useful? 1 out of 2 users found this white paper useful
White Paper RSSMutual Interference in OFDM-Based Spectrum Pooling Systems
DownloadPublic mobile radio spectrum has become a scarce resource while wide spectral ranges are only rarely used. Here, a new strategy called spectrum pooling is considered. It aims at enabling...
Design and Simulation of Orthogonal Frequency Division Multiplexing (OFDM) Signaling
A MATLAB program has been written to investigate Orthogonal Frequency Division Multiplexing (OFDM) communication systems. This program is valuable for future researchers simulating systems that are too theoretically complex to...
V.92 The Next Generation Modem Technology
The paper discusses the features and benefits of V.92. As with any new standard, multi-vendor interoperability is critical to help accelerate deployment of standards-based equipment. Lucents V.92 solution inter-operates with...
Effect of Rounding and Saturation in Fixed-Point DSP Implementation of IFFT and FFT for OFDM Applications
This paper describes a new technique for designing FFTs for Orthogonal Frequency Division Multiplex (OFDM) transmitters and receivers. Using the new technique, signals within the FFT structure are scaled so...
Optimum Noise Thresholds in Decision Directed Impulse Noise Mitigation for OFDM
Impulse noise is a significant problem in some OFDM applications including digital television broadcasting. This paper studies the optimum threshold values for a novel decision directed impulse noise mitigation algorithm....
