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In this paper, channel spatial characteristics which mainly depend on the spatial correlation are selected as the significant factors in over-the-air (OTA) testing for multiple input multiple output (MIMO) devices. The multi-probe anechoic chamber method, a promising candidate of the MIMO OTA testing methods, can reproduce the multipath environments in a controllable manner. A novel physical configuration...
This paper proposes a combination technique of the frequency-domain random demodulation (FRD) and the broadband digital predistorter (DPD). This technique can linearize the power amplifiers (PAs) at a low sampling rate in the feedback loop. Based on the theory of compressed sensing (CS), the FRD method preprocesses the original signal using the frequency domain sampling signal with different stages...
Capacity region and minimum energy function for a variety of delay‐tolerant mobile unicast ad hoc networks are studied by using a cell‐partitioned model. First, theorems about analytical expressions of network capacity and upper bound of minimum energy function are proposed and proved. Algorithm aiming at maximizing capacity and minimizing energy cost is presented and analyzed by Lyapunov drift method...
A novel design of high-efficiency broadband power amplifier (BPA) with the low-pass bias networkto enhance the efficiency and output power is presented in this paper. Compared with other bias networks, the proposed low-pass bias network shows a smaller baseband impedance, which can reduce the electrical memory effect. While it provides a larger radio frequency (RF) impedance, which can prevent the...
This paper proposes a low-cost hardware architecture based on concurrent dual-band digital pre-distorter (DPD). The architecture is implemented on field programmable gate array (FPGA) to compensate for the nonlinearity of the concurrent dual-band power amplifier (PA). This implementation introduces a novel model complexity reduction technique into system, namely, time-division multiplexing for out-of-band...
Filter bank multi-carrier (FBMC) with offset quadrature amplitude modulation (OQAM) has been regarded as one of the candidates for next generation broadband wireless communication systems. Being a multi-carrier technique, FBMC suffers from the inherent drawback of high peak-to-average power ratio (PAPR). And it has been turned out that conventional PAPR reduction schemes for orthogonal frequency division...
The enhanced eigenvalue decomposition (EEVD) based channel estimation algorithm, which could solve the pilot contamination problem in massive multiple-input and multiple-output (Massive MIMO) channel estimation when the number of antennas at base stations (NABT) tends to infinity, is proposed in this paper. The algorithm is based on the close relationship between covariance matrix of received pilot...
The maximum traffic intensity supported by a low earth orbit (LEO) mobile satellite system (MSS) (LEO-MSS) is important in practical application for providing satisfactory service. An analytical approach is proposed for determining the maximum traffic intensity of guaranteed handover (GH) scheme and channel complete sharing (CCS) scheme in LEO-MSS under quality of service (QoS) constraints. By evaluating...
The authors pay focus on the K user multiple-input multiple-output (MIMO) Gaussian interference channel (IC) with M transmitting antennas and N receiving antennas, in which min (M, N)/max (M, N) ⩾ (K−1)/[K (K−2)] and K > 3. The channel coefficients are variable, time varying or frequency selectively drawn from a continuous distribution. Based on ergodic interference alignment (IA), an achievable...
In this paper, a digital signature with high security based on location information is proposed. Based on the characteristics of mobile terminal, we proposed the scheme, taking network attack and physical attack into consideration, to insure the data on mobile terminal to insure user's right. By analyzing related location data to calculate user's often area, we judges whether user's current access...
As a research focus, space information network has extensive applications in many fields. The network architecture is an important factor in network success. The architecture should be determined by many factors, such as the types, functionalities, orbits and equipped communication links of aircrafts defined as network node in space information network. Considering all above factors as input, this...
Recently, TDMA-based MAC protocols have been discussed in wireless sensor networks for their energy-efficient performance. But the weaknesses of clock synchronism and scheme adjustment obstruct the development of these protocols. In this paper, we introduce the token ring technology into wireless sensor networks and propose a new protocol - Token Ring MAC (TRMAC), which provides stronger resource-scheduling...
One of the major challenges for wireless network design is the efficient mobility management Mobile IP is a commonly accepted protocol to realize the global mobility. Mobile IP networks suffer high binding update traffic from high rates of handoffs and long packet delivery delay from the large distance to the home network. In this paper, we introduce a new seamless handoff solution for macro-mobility...
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