A Novel Periodogram-Based Frequency Offset Estimation Method for OFDM Systems
نویسندگان
چکیده
The frequency offset estimation is one of the most important tasks in orthogonal frequency division multiplexing (OFDM) communication systems. To estimate frequency offset, a periodogram-based estimator has been proposed by Ren [6]. The method consists of three estimation steps and gives an accurate results. However, in the second and third estimation steps, the maximum frequency offset that can be estimated is limited by subcarrier spacing. This range is insufficient compared with the overall signal bandwidth, and causes high complexity in the first estimation step. In this paper, we propose a novel frequency offset estimation method with wide estimation range. The proposed method can efficiently extend the estimation ranges without loss of accuracy. Keyword: OFDM, frequency offset, periodogram, estimation, wide range.
منابع مشابه
A Novel Estimation Method for Integer Frequency Offset in Wireless OFDM Systems
Ren et al. presented an efficient carrier frequency offset (CFO) estimation method for orthogonal frequency division multiplexing (OFDM), which has an estimation range as large as the bandwidth of the OFDM signal and achieves high accuracy without any constraint on the structure of the training sequence. However, its detection probability of the integer frequency offset (IFO) rapidly varies acc...
متن کاملA technique for Carrier frequency offset estimation in OFDM- based systems for Frequency-Selective Fading Channels
This paper discusses the effects of frequency offset on the performance of orthogonal frequency division multiplexing (OFDM) digital communications. The main problem with frequency offset is that it introduces interference among the multiplicity of carriers in the OFDM signal. The aim of this survey is to investigate Carrier frequency offset estimation method in based OFDM systems. According to...
متن کاملA Novel Frequency Offset Estimation Scheme for OFDM Systems
In this paper, we propose a novel frequency offset estimation scheme for orthogonal frequency division multiplexing (OFDM) systems. By correlating the OFDM signals within the coherence phase bandwidth and employing a threshold in the frequency offset estimation process, the proposed scheme is not only robust to the timing offset but also has a reduced complexity compared with that of the conven...
متن کاملAn OFDM Carrier Frequency Offset Estimation Scheme with Wide Fractional Offset Estimation Range
In this paper, we propose a carrier frequency offset (CFO) estimation scheme which is robust to the fractional CFO variation for orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme first performs the envelope equalization process to convert the offset estimation problem to a carrier estimation problem, and then, estimates the integer and fractional parts of CFO by usi...
متن کاملA Method for RFO Estimation Using Phase Analysis of Pilot Symbols in OFDM Systems
In this paper, a method for CFO/RFO estimation based on proportional coefficients extraction in OFDM system is proposed, which may be applied to any pilot symbol pattern. Keywords—OFDM (Orthogonal Frequency Division Multiplexing), CFO (Carrier Frequency Offset, Redundancy Frequency Offset), proportional coefficient extraction.
متن کامل