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This paper investigates the throughput performance using adaptive modulation and coding (AMC) focusing on the causes of impairment to Orthogonal Frequency Division Multiplexing (OFDM) - Multiple-Input Multiple-Output (MIMO) multiplexing. We first investigate the influence of a limited number of modulation and coding schemes (MCSs) and channel estimation error for MCS selection based on mutual information...
In order to adapt channel variation and maximize throughput performance, Adapt Modulation and Coding (AMC) is used in Long-Term Evaluation (LTE) downlink. However, due to the wireless channel random variation, inaccurate reported Channel Quality Indicator (CQI) is introduced, which will affect quality of data transmission. Therefore, it is necessary to modify reported CQI in AMC process. Although...
A new adaptive digital beamforming of circle array on the receiving radar station based on compressed sensing is proposed. According to the sparsity of targets in space, we design a digital beamforming by using the theory of compressed sensing. This algorithm greatly reduces the number of actual array elements with the same antenna aperture. In the case of sparse array, the echo information of the...
Benefiting from its extra degrees of freedom brought by waveform diversity, MIMO radar allows to optimize the transmit beam-pattern much more freely. In this paper, a new transmit beamforming algorithm is proposed for subarray MIMO radar. Firstly, the correlation matrix of the transmitted waveforms is optimized to focus the transmit energy within the interested sectors. Then, the eigendecomposition...
The adaptive phase-only beamforming technique is very important for conventional phased array radar to suppress interference. Similar to conventional phased array radar, for the digital array radar, the adaptive phase-only beamforming technique is also very useful and can be used to enhance the radar power by making full use of transmit module microwave power of each array element. In this paper,...
A new method for digital modulation recognition in shortwave communications based on wavelet packet and cumulants is presented. It uses wavelet packet transform and cumulants as feature extraction method and hierarchical classifiers based on support vector machines as the classifier. This hierarchical method has higher recognize rate compared with other methods. Classification results for 10 modulation...
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