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Frame structure, modulation and transmission of CMMB are analyzed in this paper, a baseband receiver solution is proposed in paper, including synchronization, channel estimation and FEC. In this solution, synchronization signal correlation is adopted to realize the synchronization, channel estimation uses one-dimension linear interpolation, and LDPC decoder is realized by layered decoder algorithm...
This paper addresses problems related to time and frequency synchronization as well as blind CP (cyclic prefix) type identification in 3GPP LTE system. We start with a general framework based on maximum likelihood (ML) parameter estimation. Then, simplified practical algorithms for estimating time and frequency offset as well as blind CP length are described. Finally, a robust hierarchical scheme...
A novel cell search scheme based on coherent sequence detection and sign decision is proposed in this paper. The given structure of the SCH (synchronization channel) allows the UE (user equipment) to detect cell ID with low complexity, and the adverse effects of the channel fading and frequency offset are eliminated in the three search steps. The performance of the scheme is investigated in various...
In this paper, based on mutually orthogonal (MO) ZCZ polyphase sequence (PS) sets proposed by Ref. [11], a method for improving the family size of ZCZ sequences in each set mentioned above is presented. As compared with Ref. [11], the resulting ZCZ sequences in each set can arrive to their theoretical bound due to expansion of their family size, whereas the length and width of ZCZ of ZCZ sequences...
This paper presents an architecture of an autocorrelator for Orthogonal Frequency Division Multiplexing systems. The received signal is quantized to only the sign-bit, which dramatically simplifies the frequency offset estimation. Hardware cost is reduced under the assumption that synchronization during acquisition does not have to be very accurate, but sufficient for coarse estimation. The architecture...
In this paper, we propose a coarse and fine frequency synchronization method which is suitable for the 3rd Generation Partnership Project (3GPP) long term evolution (LTE) orthogonal frequency division multiple access (OFDMA) system in time division duplexing (TDD) mode. In general, primary synchronization signal (PSS) correlation based estimation method and cyclic prefix (CP) correlation based tracking...
OFDM system performance is sensitive to frequency offset and timing error than single-carried system. In this paper, a novel joint time and frequency synchronization method is proposed based on PN sequences for OFDM. A special training symbol of OFDM is constructed with the PN sequence and the differentially coded PN sequence in the transmitter, in the receiver, the training symbol is differentially...
In this paper, a complete solution to the initial synchronization for multi-cell OFDMA (orthogonal frequency division multiple access) systems is proposed. The proposed method consists of the following operations: timing synchronization, fractional carrier frequency offset (CFO) estimation, fractional CFO compensation, and joint integer CFO and preamble index estimation. To estimate multiple fractional...
In this paper, we propose a low-complexity carrier frequency offset (CFO) estimation algorithm for OFDM based wireless LAN, IEEE 802.11a. The complexity of the arctangent operation to calculate the argument of auto-correlation for CFO estimation is reduced by a novel range pointer method. The proposed algorithm estimates fine CFO value first and then based on the fine CFO value, simple criteria is...
This paper analyzes the synchronization problem of OFDM in FH communication system, studies timing synchronization and frequency synchronization using pilots according to the characterization of OFDM and FH. This algorithm determines the time position and frequency offset using the correlation of the pilots. The research result indicates that this algorithm is available in the FH system.
Considering the features of Underwater Acoustic channel and the sensitivity versus synchronization for CI/OFDM system, A time and frequency synchronization method based on Constant Amplitude Zero Auto-Correlation(CAZAC) sequence is presented. The time offset estimation and carrier frequency offset estimation can be achieved simultaneously. The fractional part and integral part of carrier offset estimation...
According to the packet structure of IEEE Standard 802.11a and the characters of short training symbols, a new frequency offset estimation algorithm is presented. A two stages strategy based on auto-correlation algorithm is used to solve the contradiction between estimation accuracy and estimation range. At the first stage, the coarse frequency offset estimating bases on the identity of half cyclical...
The synchronization problem is analyzed for low voltage power-line communication of orthogonal frequency division multiplexing (OFDM). It is analysed theoretically what affect synchronization problem such as frequency synchronization error and timing synchronization error. A new symbol timing and carrier frequency synchronization algorithm is presented and the algorithm divides the OFDM symbol into...
This paper presents an efficient frequency estimator for digital video broadcasting - second generation (DVB-S2). Analyzing the robust algorithm among data-aided approaches, we find that the Luise & Reggiannini (L&R) algorithm is the most suitable one for coarse frequency estimation with respect to estimation performance and complexity. However, it requires many multipliers and adders to compute...
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