Abstract
In this correspondence, we show how the cyclic prefix (CP) can be used to enhance the performance of an orthogonal-frequency-division multiplexing (OFDM) receiver. Specifically, we show how an OFDM symbol transmitted over a block fading channel can be blindly detected using the output symbol and associated CP. The algorithm boils down to a nonlinear relationship involving the input and output data only that can be used to search for the maximum-likelihood (ML) estimate of the input. This relationship becomes much simpler for constant modulus (CM) data. We also propose iterative methods to reduce the computational complexity involved in the ML search of the input for CM data.
| Original language | English |
|---|---|
| Article number | 5420047 |
| Pages (from-to) | 3406-3410 |
| Number of pages | 5 |
| Journal | IEEE Transactions on Signal Processing |
| Volume | 58 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2010 |
Bibliographical note
Funding Information:Manuscript received April 29, 2009; accepted January 18, 2010. Date of publication February 25, 2010; date of current version May 14, 2010. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Geert Leus. This work was supported by SABIC Fast Track, Project No. SB080007, Deanship of Scientific Research, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
Keywords
- Blind channel estimation
- Genetic algorithm
- Maximum-likelihood detection
- Newton's method
- OFDM
ASJC Scopus subject areas
- Signal Processing
- Electrical and Electronic Engineering