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The unavoidable Doppler frequency shift reduces the correlation peak for code acquisition in global positioning system (GPS). In contrast to conventional methods where the code phase and Doppler frequency shift are separately treated, this paper proposes a novel three-step scheme for joint code acquisition and Doppler estimation, whereby not only the Doppler effect on the correlation peak is removed,...
Through the investigation on frame header (FH) structures of DTMB system, i.e. the digital terrestrial television broadcasting standard of China, spectrum sensing methods based on PN cross-correlation (PNCC) are proposed for all FH options. Miss-detection probability, decision threshold and sensing time requirement of the proposed methods are analyzed in detail. Comparisons on spectrum sensing performance,...
Pseudo-noise (PN) sequence is widely used in wireless transmission systems for synchronization, which is usually performed via cross-correlation, i.e. PN correlator, between the received signal and a locally generated PN sequence. However, the hardware implementation of such a correlator becomes the inhibiting bottleneck of integration due to the long tapped-delay line, particularly in the case of...
In order to improve the system performance over wireless fading channel, transmit diversity technique has been proven as an attractive and effective solution especially for broadcasting systems. In this paper, a PN sequence design scheme based on both cyclic-shift m-sequences and space-time block coded (STBC) m-sequences for time domain synchronous orthogonal frequency-division multiplexing (TDS-OFDM)...
To deal with the problem of maintaining variable data set in digital image processing, this paper brings forward a general hardware structure for linked-list. It is designed to accomplish the commonly used functions and some more complicated functions of the linked-list data structure. In order to fully utilize the limited memory resources in embedded hardware platform, we propose a memory recycle...
A dynamic traffic distribution algorithm based on the minimization product of packet delay and packet energy consumption is proposed. The algorithm is based on packet delay and energy consumption in allocating traffic, which can optimize the network performance. Simulation demonstrated that the algorithm could dynamically adjust to the traffic distribution between paths, which can minimize the product...
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