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Considering both inefficiency of the pilot usage and high complexity of current carrier synchronization algorithms for burst-mode systems, a novel distributed joint time-frequency domain (DJTFD) carrier synchronization algorithm is proposed. The frequency-domain estimation has a large residual offset with limited pilot overhead. So we need the distributed time-domain estimation to guarantee both large...
Considering both large cost and high complexity of current carrier synchronization systems at low Signal-to-Noise Ratio (SNR), an adaptive carrier synchronization system design in accordance with Green communication is proposed. First, the proposed design takes advantage of parameter control method to change an optimal scheme to some suboptimal schemes. Within the requirement of satisfying less SNR...
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 relating the use of consumer-grade equipment, Carrier Synchronization is a difficult task for DVB-S2 receivers, which have to operate with a large initial Carrier Frequency Offset (CFO) yet needing to achieve relatively high estimation precisions. For these reasons, conventional Carrier Frequency Recovery schemes for DVB-S2 systems need significant hardware complexity. In contrast, this paper proposes...
In this paper, research for the cell search of the LTE TDD system and the initialization of carrier frequency offset estimation algorithm, theoretical derivation is given from timing synchronization and sector ID detection algorithm. In this work, simulated and researched the performance of cell search algorithm in the spread of multi-path environment. Through the method of analyze the complex and...
This paper presents a design and implementation on timing and frequency synchronization for OFDM-based WLAN. Synchronization in OFDM-based receiver is critical for performance and needs a great deal of hardware resources. Based on the discovered symmetries between real and imaginary values in short preamble of IEEE 802.11, applying the symmetries of a short preamble can reduce the hardware complexities...
An uplink OFDMA systems is considered. Different users use different transmit antennas, thus, each user contributes a different carrier frequency offset (CFO) at the receiver. The multiple CFOs introduce intercarrier interference, thus impeding user separation and transmit signal recovery. A low complexity CFO estimation approach is proposed for estimating multiple CFOs. The proposed approach relies...
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, a residual frequency offset (RFO) synchronization scheme using a simplified coordinate rotation digital computer (CORDIC) algorithm is proposed for orthogonal frequency division multiplexing (OFDM) systems. The RFO synchronization scheme using a conventional CORDIC algorithm uses the vector-mode CORDIC for RFO estimation, and the rotation-mode CORDIC for RFO compensation. The proposed...
In communication systems which transmit a continuous stream of data, the coded data symbols are typically transmitted in frames. Frames contain one or multiple blocks of coded data. The start of a frame (SOF) is especially required to synchronize the decoder, especially in systems which use block codes such as Turbo and LDPC codes. This process is known as frame synchronization. We examine the general...
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