Learn More
Cognitive radio (CR) as one of the most promising technologies to solve the problem of exhausting of spectrum resource, draws a lot of attention recently. However, for the highly intelligent wireless devices in the future, the assumption "CR devices introduce no interference to the primary users (PUs)" in traditional CR systems may do not exist anymore, due(More)
The 3rd generation partnership project (3GPP) long term evolution (LTE) standard has adopted orthogonal frequency division multiplexing access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) scheme for the uplink transmissions, which utilizes single carrier modulation and frequency domain equalization. In this paper, we(More)
The resource allocation and limited feedback scheme are proposed in multiuser MIMO OFDM systems. The optimization model is to maximize the throughput with minimal and maximal transmit rate constraint of users, which can effectively guarantees the QoS requirment of multimedia traffics. The resource allocation is divided into user selection and power(More)
Multiple model channel estimation with weighted switching is proposed in this paper to adapt to the dynamic nature of double-selective channels. We build the multiple channel estimation models composed of different basis expansion models for channels and different estimation methods. The switching is designed as the weight sum of the models in the model(More)
This paper is concerned with the challenging problem of joint channel estimation and data detection for high mobility multiple-input multiple-output orthogonal frequency division multiplexing systems. We propose a new iterative channel estimation and detection scheme, which reduces the unexpected effects of both detection errors and channel estimation(More)