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In this paper two differential subcarrier grouping schemes named MSSG and SSSG are firstly analyzed under the same mathematic model. Then we describe two differential space-frequency modulation schemes combining differential space-time modulation and orthogonal frequency division multiplexing. They are F-DSFM in which differential encoding is carried out in frequency direction and T-DSFM in which...
A cross-layer adaptive resource allocation algorithm of multi-user MIMO OFDM systems is proposed and simulated. The aim is to maximize the transmit rate under the constraints of the fixed transmit power and QoS. The algorithm exploits the fair of wait time of each user to allocate subcarriers whose allocation standard is the spatial subchannel whose SNR is best, bits and power of subcarriers and spatial...
An adaptive MIMO OFDM system using QAM and LDPC code is proposed with only two parameters required to be sent to the transmitter, which are the mean and the variance. Simulation shows that the proposed system can outperform the other similar systems.
An adaptive transmission scheme of MIMO-OFDM system based on MQAM and LDPC code is proposed. An transmit optimization algorithm to obtain an bit and power allocation is used which selects the MCS requiring only the mean and variance assuming the received LLR distribution as Gaussian. Simulation results show the performance of the proposed scheme is up to about 3dB better than other transmission schemes...
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