Some Issues of Complexity and Training Symbol Design for OFDM Frequency Offset Estimation Methods Based on BLUE Principle
نویسندگان
چکیده
In this paper we present reduced complexity OFDM frequency offset estimation methods based on the hest Linear unbiased estimation (BLUE) prinaple. Firstly, reduced complexity version of methods from [61 is pmented. Secondly, a method that possesses both slight performance improvement of [6] and complexity advantage of [SI is proposed. Furthermore, we present the effects of the number of identical parts contained in the training symbol on the frequency offset estimation performance. Our results indicate that an improper choice of the number of identical parts contained in the training symbol can cause significant performance degradation to the methods of [51 and I61 while a proper choice can give extra MSE improvement.
منابع مشابه
A Novel Timing and Frequency Synchronization Technology for OFDM System
Due to its high spectrum efficiency and good ability in coping with multi-path fading, orthogonal frequency division multiplexing (OFDM) technology has attracted considerable attention from researchers. However, OFDM system is very sensitive to symbol timing offset and carrier frequency offset, so accurate timing synchronization and frequency synchronization are necessary to OFDM system. This p...
متن کاملChannel Estimation and CFO Compensation in OFDM System Using Adaptive Filters in Wavelet Transform Domain
Abstarct In this paper, combination of channel, receiver frequency-dependent IQ imbalance and carrier frequency offset estimation under short cyclic prefix (CP) length are considered in OFDM system. An adaptive algorithm based on the set-membership filtering (SMF) algorithm is used to compensate for these impairments. In short CP length, per-tone equalization (PTEQ) structure is used to avoid i...
متن کاملCarrier Frequency Offset Estimation for OFDM Systems using Repetitive Patterns
This paper deals with Carrier Frequency Offset (CFO) estimation for OFDM systems using repetitive patterns in the training symbol. A theoretical comparison based on Cramer Rao Bounds (CRB) for two kinds of CFO estimation methods has been presented in this paper. Through the comparison, it is shown that the performance of CFO estimation can be improved by exploiting the repetition property and t...
متن کاملMimo Ofdm Systems Using a Common Training Signal
This paper presents a common training signal design and corresponding estimation methods for carrier frequency offset and frequency-selective channels in MIMO OFDM systems. In designing the common training signal, a training signal structure which yields low complexity estimation methods is developed while the optimality of the training signal is maintained. Frequency offset estimation is based...
متن کاملHopping Pilots for Estimation of Frequency-Offset and Multi-Antenna Channels in MIMO OFDM - Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE
We design pilot symbol assisted modulation for carrier frequency offset (CFO) and channel estimation in orthogonal frequency division multiplexing (OFDM) transmissions over multi-input multi-output (MIMO) frequency-selective fading channels. By separating CFO and channel estimation from symbol detection, the novel training patterns lead to low-complexity CFO and channel estimators. The performa...
متن کامل