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We derive new theoretical bounds on the minimum bit error probability (BEP) of optimal multiuser joint detection in the uplink of a cooperative cellular network. To identify key insights, we consider the basic two-cell cooperative scenario where the signals transmitted by two users are jointly detected at two base stations. For such a network, we derive closed-form expressions for upper and lower...
A beam space processor is a two beam processor also referred to as Postbeamformer Interference Canceler (PIC) which cancels only one interference by forming two beams, a signal beam and an interference beam. This paper extends the PIC processor using the improved interference beams (IIB) for a number of interferences by deriving the expression of signal to interference plus noise ratio (SINR) and...
Integer-forcing (IF) linear receiver has been recently introduced for multiple-input multiple-output (MIMO) fading channels. The receiver has to compute an integer linear combination of the symbols as a part of the decoding process. In particular, the integer coefficients have to be chosen based on the channel realizations, and the choice of such coefficients is known to determine the receiver performance...
In this paper, we investigate the secure transmission design with practical assumptions on the channel state information (CSI). Specifically, the CSI of the legitimate link is imperfectly estimated and the CSI of the eavesdropper is unknown to the legitimate users. We derive both a fixed-rate and an adaptive-rate transmission schemes by explicitly considering the rate parameters of the wiretap code...
In Long Term Evolution-Advanced (LTE-A) cellular networks, minimizing inter-cell interference is the key to maximizing coverage and capacity. This can be achieved by setting the antenna parameters such as azimuth orientations and tilts to the optimal values. Due to the interdependencies between these parameters, finding the optimal configuration is a time-consuming and complex task. Among the various...
This paper addresses the problem of frame synchronization in code division multiple access systems in the presence of high multiple access interference. Already acquired user signals are regenerated using soft information from the respective decoders and subtracted from the received signal to mitigate multiple access interference. We consider partial cancellation of interference after few decoder...
We design systematic and regular repeat-accumulate (RA) codes for non-ergodic block-fading channels. An encoder structure of RA codes for block-fading channels with an arbitrary number of fading blocks is proposed. Simulation results show that the proposed RA codes achieve full-diversity word error rate (WER) performance over block-fading channels. In addition, the WER performance of the proposed...
Real-time audio transmission requires good quality for a restricted channel capacity and minimum latency. An ultra-low delay audio coding scheme based on differential pulse code modulation (DPCM) and block companded quantization is presented. The prediction filter of the base backward DPCM codec is attained as a FIR filter in lattice structure. The proposed block based audio coding introduces an algorithmic...
This paper investigates the connectivity properties of three dimensional wireless sensor network in which N nodes are independently and uniformly (i.u.d.) distributed either on the surface of a sphere of radius R or inside the volume of a ball of radius R. Our approach utilizes the geometrical probability results for the conditional probability that a random node falls inside a ball centered at an...
We propose a new scheduler for the dual-hop amplify-and-forward wireless multimedia relay network (WMRN). Our scheduler is designed to account for delay and symbol error probability (SEP). We develop a cross-layer scheduling approach for the downlink to balance these system metrics. Our scheduler is based on a new metric we call the delay in packet scheduling (DPS). The user with the largest weighted...
A state-dependent degraded broadcast diamond channel is studied where the source-to-relays cut is modeled with two noiseless, finite-capacity digital links with a degraded broadcasting structure, while the relays-to-destination cut is a general multiple access channel controlled by a random state. It is assumed that the source has non-causal channel state information, the relays have no state information...
In the time difference of arrival (TDOA) problem, the unknown location of an emitter is estimated using a set of TDOA estimates. In this paper, a closed-form solution for a nominal TOA in the TDOA problem is presented for the case of three or four receivers that under certain conditions results in location estimates that are optimal in the least-square error sense.
In this paper, we study the performance of quickest spectrum sensing when the received signal experiences various fading conditions, including the time-invariant, Rayleigh, Rician, Nakagami-m and the F channel. We prove that the power of the complex received signal is a sufficient statistic and derive the probability density function of the received signal amplitude for all of these fading cases....
In this paper, the error performance of compute-and-forward with QPSK over Rayleigh fading two-way relay channels is analyzed. We investigate the optimal way to select the computation coefficients to minimize the error probability at the relay. This is equivalent to maximizing the minimum Euclidean distance between the network coded messages on a superimposed two-user constellation at the relay. We...
In this paper, we study power allocation in OFDM based cognitive radio (CR) relay networks when the fading statistics between cognitive and primary users are known at the CR transmitters. The objective of power allocation is to maximize the instantaneous capacity of the CR network. Optimal power allocation schemes are developed for both decode-and-forward (DF) and amplify-and-forward (AF) relay assisted...
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