CPM Training Waveforms With Autocorrelation Sidelobes Close to Zero

Continuous phase modulation (CPM) plays an important role in wireless communications due to its constant envelope signal property and tight spectrum confinement capability. Although CPM has been studied for many years, CPM training waveforms having autocorrelations with zero sidelobes have not been reported before, to the best of our knowledge. Existing works on the CPM system design mostly assume that the channel fading coefficients are either perfectly known at the receiver or estimated using random CPM training waveforms. In this correspondence paper, we propose a novel class of CPM training waveforms displaying autocorrelation sidelobes close to zero. The key idea of our construction is to apply differential encoding to Golay complementary pair having perfect aperiodic autocorrelation sum properties

ERROR PERFORMANCE ANALYSIS FOR PI/M-DMPSK IN FAST FREQUENCY-SELECTIVE RICIAN FADING CHANNEL WITH DIVERSITY RECEPTION

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Abstract: This work assumes that local oscillators in individual transceivers are not identical. A difference in the drift of oscillator gives rise to a difference in pulse repetition rate between transmitter and receiver. This drift will be estimated in the paper. The performance of a proposed Automated Gain Control (AGC) circuit to stabilize the gain of a time tracking loop is also investigated. Thus this work is on estimating the received signal amplitude, the initial offset and frame frequency differences between a pair of UWB impulse transceiver and the results will be useful for applications such as time transfer and synchronization

A study on reconstruction of linear scrambler using dual words of channel encoder

In this paper, the reconstruction of the feedback polynomial as well as the initial state of a linear feedback shift register (LFSR) in a synchronous scrambler placed after a channel encoder is studied. The study is first based on the assumption that the channel is noiseless and then extended to the noisy channel condition. The dual words, which are orthogonal to the codewords generated by the channel encoder, are used in the reconstruction algorithm. The number of bits required by the new algorithm is compared with another recently proposed algorithm and results show that the number of bits required to do the reconstruction can be significantly reduced

Reconstructing a linear scrambler with improved detection capability and in the presence of noise

In this paper, the problem of reconstruction of the feedback polynomial in a linear scrambler is studied. Our work contains two parts. In the first part, schemes to improve the performance of an existing reconstruction algorithm are proposed. Simulation results show that both the detection capability and speed of the existing algorithm are significantly improved by using our proposed schemes. In the second part, the reconstruction of linear scramblers in the presence of channel noise is investigated. We consider flipped bits due to noise as well as insertion of bits in the scrambled bit sequence. For both cases, factors which affect the performance of the reconstruction algorithm are discussed.Accepted versio