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In LTE-A (Long Term Evolution-Advanced) network deployed with higher order MIMO (Multiple Input Multiple Output), CRS (Common Reference Signal) is substituted by CSI-RS (Channel State Information Reference Signal) aiming for detecting channel more efficiently. But LTE (Long Term Evolution) legacy UEs (User Equipment) cannot distinguish CSI-RS from data which may deteriorate the LTE UEs' demodulation...
In LTE-A (Long Term Evolution-Advanced) network, CSI-RS (Channel State Information Reference Signal) is substituted for CRS (Common Reference signal) to perform higher order MIMO (Multiple Input Multiple Output). In CoMP (Coordinated Multiple Point Transmission) scenario, the number of REs (Resource Element) occupied by CSI-RS would be multiplied. However, LTE (Long Term Evolution) legacy UEs (User...
In this paper we have considered a new resourse sharing approach for wireless access which is based on power assignment strategy, where two sources transmit their information simultaneously to the destination with the different power but use the same sub-band (time-frewquency unit). It discusses the concept of non-orthogonal multiple access (NOMA) which has a power multiplexing at the transmitter...
Two compact planar UWB MIMO antennas for wireless communications are presented. The first antenna, which operates in the 2.3–12 GHz frequency band, has a size of 72 mm × 48 mm × 0.76 mm. High port-to-port isolation over the whole ultra-wideband is achieved by using an inverted-T stub between the elements. The second antenna has a size of 34 mm × 47 mm × 1.6 mm, and operates in the band from 3.8 to...
This correspondence researches the multiuser detection (MUD) in a new massive MIMO system, where the base station (BS) acquires the quantized amplitude-only (AO) measurements of the complex baseband signals through the envelop detection and low-resolution analog-to-digital convertor (ADC) sampling. Cumbersome frequency mixers are removed and low-resolution ADCs can easily reach the Giga-sample-persecond...
CSI-RS (Channel State Information Reference Signal) is designed for higher-order MIMO in LTE-A. However, it could be problematic for LTE legacy UEs in a LTE-A network deployed higher-order MIMO because LTE UEs cannot distinguish CSI-RS from effectual data. In this paper, the impact of CSI-RS on LTE UEs are firstly evaluated by both link-level and system-level simulations. The evaluation results show...
Wireless video transmission is one of the main applications of wireless local area networks. And high-speed video transmission can be achieved with the application of MIMO-OFDM technologies. But the conventional digital video transmission in MIMO has to degrade performances of all the antennas to be the same as the antenna with the worst channel gain. Based on H.264/AVC and ParCast, a hybrid digital-analog...
This paper considers the optimal tracking control (OTC) problem for MIMO systems affected by external disturbances based on stability degree constraint. The objective is to find an OTC, by which the cost function minimum and the state with the OTC having a higher mean-square convergence rate can be obtained. According to the special disturbance form, by supposing the Lagrange operator to solve the...
In mobile communication, space is a very important domain to use. Two kinds of leading techniques are beamforming and STBC in MIMO system. This paper investigates the relation between beamforming and STBC at the capacity perspective. Both techniques can improve system performance at the cost of the capacity, which shows that they convert the matrix channel into a scalar AWGN channel. At low SNR, the...
MIMO-OFDM system is the main technology to the future wireless system. In this paper, to model multipath propagation and spatial-temporal fading correlation in frequency-selective channel, we propose a fading-correlated MIMO channel model. The channel is abstracted as a cluster-based double bounce model with multiple taps. Both transmitter and receiver are considered. The expressions of correlation...
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