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Passive radar detection systems based on Global Navigation Satellite System (GNSS) signals have the advantages of wide coverage, long detecting distance and good concealment. If effectively combined with the forward scatter radar (FSR) principle, it can be used to monitor an important area, which is of great significance to national defense security. This paper mainly focused on the analysis of signal...
This paper reports a power-efficient equalizing receiver designed for multi-data rate serial link applications. It includes a continuous-time linear equalizer (CTLE) and a halfrate 1-tap speculative decision feedback equalizer (DFE). The proposed StrongArm latch-based DFE adopts a novel non-50% duty-cycle clocking scheme to achieve 20% higher speed compared with the conventional 50% duty-cycle clocking...
In this paper, we propose a new joint beamformer and offset design method for visible light communication (VLC) with multiple red/green/blue light emitting diodes (RGB LED). We take into account key practical lighting constraints including optical power, color illumination, non-negativeness, CRI and LER, and formulate a non-convex optimization problem to minimize the system mean squared error (MSE)...
Recently, the optimal transceiver design in multiuser multiple-input-multiple-output (MIMO) relay systems has attracted great attention. Unlike most existing works, we take the channel correlation and estimation errors into account, and jointly optimize the relay and receiver matrix in multiuser MIMO relay systems. First, the mean-square error (MSE) expression at receiver is derived, and a minimum...
The performance of wireless networks is fundamentally limited by the interference level. In the existing literature, the direction-selective characteristics of interference have not been considered. In order to alleviate this problem, we propose a novel network description method, namely the interference azimuth spectrum (IAS). The IAS represents the distribution of interference in the angular domain,...
This paper considers the problem of jointly decoding binary messages from a single distant transmitter to a cooperative receive cluster. The nodes in the receive cluster exchange information to decode messages from the transmitter. The outage probability of distributed reception with binary hard decision exchanges is compared with the outage probability of ideal receive beamforming with unquantized...
We consider a full-duplex bi-directional communication system between two nodes that suffer from self-interference, where the nodes are equipped with multiple antennas and instantaneous channel state information (CSI) at the nodes is imperfect. We focus on the effect of the residual self-interference due to channel estimation errors and limited dynamic ranges of the transmitters and receivers. We...
In a typical cognitive radio network (CRN), secondary users can only access the channel when they do not harmfully interfere with the primary users. Therefore, an accurate estimation or prediction of interference from secondary users to primary users is essential. In this paper, we tackle the problem of interference estimation in a channel in presence of one PU and multiple SUs. We solve this problem...
This paper proposes a novel constellation alignment and interference cancellation scheme for wireless systems. Compared with the existing literatures on interference channel capacity analysis with lattice codes, a general signal processing algorithm is proposed for the systems using mutual baseband signal processing components, i.e., channel coding and QAM modulation. Specifically, multiple interference...
Machine-to-machine (M2M) communications are to exchange information between a subscriber station and a server in the core network through a base station or between subscriber stations which may be realized without any human interaction or intervention. There are some requirements when designing M2M communication systems such resource allocation for large number of M2M devices or users. In this paper...
Recently, a cooperative paradigm in cognitive radio networks, where licensed user can leverage its own bandwidth to unlicensed user in exchange for relaying its traffic, has been advocated to further improve all participates' performance. However, it entails that all participates interrupt their communication in each time slot. We propose BBC, a novel bargaining-based cooperation mechanism. It allows...
Interference can be aligned in either vector space (MIMO) or signal scale (lattice). Existing literatures on interference alignment treat these two approaches separately. In this paper, a unified design framework of interference suppression is proposed for interference channel, where both vector alignment and lattice alignment are considered jointly. The framework could adapt the interference alignment...
This paper introduces the mobile apparatus must make their best tradeoffs for the innate limitations of the physical properties and will benefit from the cloud services via wireless broadband access. Then a secure information retrieval and reveal framework based on two-dimensional barcode digital signature scheme is proposed for mobile apparatus. In addition to the secure protocol with cipher retrieval...
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