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This paper presents an intact scheme of timing synchronization for Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra Wide Band (UWB) systems. Frame detection and coarse timing are implemented with the Maximum Correlation (MC) method based on the first-band information of the preamble. Fine timing is achieved with the Minimum Energy Ratio (MER) method based on the information of...
In this paper, we propose a new method to transmit one more information bit by using orthogonal Space-Time Block Codes (STBC) for 4 antennas. Using two different STBCs matrices transmit one additional bit to achieve high rate-9/8. To maintain full rank and full diversity for the coding gain matrix, a new STBC code with full rate and full diversity is proposed in this letter. In order to implement...
In this work, we propose a novel algorithm to combat We propose a novel transmission scheme, which divides a MPSK constellation into two labeled constellations to transmit one bit more information without requiring any additional system resource (power or bandwidth) by using orthogonal space-time block code (STBC). These two labeled constellations represent the information of this additional bit....
This paper studied the performance gain of multi-antenna technology in asymmetry Cognitive Radio (CR) interference communication systems. The main contributions include: 1. the derivation of the closed-form expressions of outage and throughput performance for Licensed User (LU) and Cognitive User (CU) in both ideal (detection is always correct) and real (detection error occurs) cognitive MIMO flat...
This paper studied the performance gain of Amplify-and-Forward (AF) cooperation technology in asymmetry Cognitive Radio (CR) interference communication systems. The main contributions are the derivation of the closed-form math expressions of outage and the throughput for Licensed and Cognitive Users in cognitive cooperative communication systems under flat Rayleigh fading channel. Under the condition...
In this paper, the analysis model which suites to Cognitive Radio (CR) communication together with amplify-and-forward cooperative communication systems where cognitive users can act as cooperative diversity relays to the licensed users based on average Channel State Information (CSI) is presented. Firstly, the model of the cooperative and cognitive radio system is given. Then, the transmitting protocols...
This paper developed a framework to analyze the performance gain in multiple-input multiple-output (MIMO) systems together with cognitive radio (CR) interference communication systems based on average channel state information (CSI). Because of interference between the cognitive user and the licensed user, the cognitive user must optimize its power to ensure the licensed user's transmission stability...
In this paper, the Symbol Error Rate (SER) performance formulation which suited to multi-node amplify-and-forward cooperative communication M-PSK constellation systems with the mean channel gains is derived. Firstly, the closed-form theory symbol error rate formulation with M-PSK modulation is derived. Then, a Low Bound (LB) is established to show the asymptotic performance of the cooperation protocol...
This paper presented novel Carrier Frequency Offset (CFO) acquisition together with multi-antenna channel estimation algorithms for burst-mode Multiple-Input Multiple-Output combined with Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. The new algorithms take full advantage of some known channel information (for example, the length of channel impulse response L which can be estimated...
This paper examined the problem of carrier phase recovery in turbo-coded OFDM systems. Then introduced a novel a priori probability aided (APPA) OFDM joint carrier phase recovery and signal detection algorithms to eliminate disadvantage impact brought by phase offset. The algorithms utilized the soft value of the extrinsic information generated by iterative maximum a posteriori (MAP) turbo decoders...
In SC-FDE (single carrier with frequency domain equalization) systems, the factor which affects the performance of systems seriously is synchronization. Based on the studying of the algorithm of T.Schmidl & D.Cox and H.Minn, a novel timing synchronization method is proposed towards the SC-FDE systems in this paper. The method takes advantage of the correlation of the training symbol what can efficiently...
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