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In distributed transmit beamforming, two, or more, spatially separated communications nodes act as elements of an antenna array to beamform common data to a destination node. Spatially separated cooperating nodes synchronize their carrier frequencies and control their transmission phases so that at the destination node the received signals combine constructively. An important example is cooperative...
In this paper, an original physical layer design of the IEEE 802.15.6 narrowband receiver is proposed, including frame synchronization, timing synchronization, and carrier frequency synchronization. This proposed single-carrier system can be incorporated into a conventional multi-carrier system of the IEEE 802.11 transceiver by reusing its hardware resource. Simulation results show that the performances...
Carrier frequency offset (CFO) estimate is a basic problem of the carrier frequency synchronization, which determines the quality of signal reception in wireless network. It is a critical technology of intelligent communication system. In recent years, researchers come up lots of algorithm in whether frequency domain or time domain. Some algorithm are related to nodulation, equalization or coding...
In this paper, we consider a method of code-aided carrier frequency synchronization at extremely low signal-to noise values based on LDPC-Hadamard code. This system comprises a low-rate LDPC-Hadamard code that is close to Shannon limit at extremely low SNR values and an EM-based carrier frequency synchronizer that makes use of the posterior probabilities of the data symbols, provided by the iterative...
This paper presents an extended solution for the carrier frequency synchronization problem of multi input multi output (MIMO) orthogonal frequency division multiplexing (OFDM). The frequency synchronization scheme proposed by Minn et al. for OFDM systems is extended to be applicable for MIMO OFDM systems. This sequel uses the same training symbol as by Minn et al., the symbol is spread by orthogonal...
Carrier frequency synchronization is important in MIMO-OFDM systems. Any carrier frequency offset will cause a loss of subcarrier orthogonality which results in ICI and hence performance degrades severely. In this paper, a preamble structure for MIMO-OFDM systems is proposed. Based on the structure, the carrier frequency synchronization algorithm in burst data transmission for MIMO-OFDM systems is...
It is well known that the cyclic property of transmitted signal can be used to achieve joint frame and carrier frequency synchronization, while the uncompensated sampling frequency offset (SFO) would still be a problem. Based on the observation that the impact of SFO on the received cyclic block and its replica is equivalent to a relative time shift, a joint synchronization scheme solely based on...
Owing to SC-FDE (single carrier with frequency domain equalization) systems perform equalization in frequency domain, carrier frequency synchronization and timing synchronization are the most important preconditions. A novel synchronization method is proposed in this paper, which adopts new structure of training symbols and new calculation method. Simulation results demonstrate that the proposed method...
Synchronization at receiver, including mode detection, frame synchronization, sampling time recovery (STR) and carrier frequency synchronization four parts, is crucial for digital communication systems. Time domain synchronous (TDS) block transmission system, in which pseudo noise (PN) sequences are padded between two adjacent data blocks as guard intervals (GI), is widely used in wireless communication...
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