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In this paper, we propose an algebraic approach to design extremely low rate low-density parity-check (LDPC) codes by employing the primitive polynomials. We first investigate the requirements for the polynomials to construct 4-cycle free LDPC codes and then propose an algebraic approach to design the parity check matrix. To achieve a better decoding performance in the extremely low rate region, we...
In this paper, we propose a practical hybrid precoding system to implement the MIMO transmission with data stream adaptation for high throughput millimeter-wave (mmWave) communications. Hybrid precoding by using both analog radio frequency (RF) precoding (beamforming) and digital baseband precoding is a practical way to achieve the required array gain and multiplexing gain, and to reduce system complexity...
Beamforming (BF) with phased arrays is a critical and natural solution for millimeter-wave (mmWave) wireless communications due to the increased signal propagation attenuation. In this paper, we propose fast and efficient codebook-based BF training to estimate antenna weight vectors (AWVs) for next generation mmWave WLANs/WPANs or the fifth generation (5G) wireless systems with spatial multiplexing...
In this paper we study low complexity linear receivers for millimeter-wave (mmWave) communication systems with uniform circular arrays (UCAs) in line-of-sight (LOS) multiple-input multiple-output (MIMO) channels. Typical applications are fixed wireless access such as small cell backhaul for high rate large capacity communications. Conventional zero forcing (ZF) and minimum mean squared error (MMSE)...
The location method based on TOA estimation is a research hotspot in the field of wireless location. In this paper, an new TOA estimation algorithm is proposed for providing a better estimation performance. The cross correlation matrix is employed to process channel estimation in frequency domain, which is benefit to the noise suppression. Channel estimation based on the optimal threshold is employed...
In this paper, the error rate performance of joint transmit and receive antenna selection (JTRAS) is investigated for independent and identically distributed (i.i.d.) flat Nakagami-m fading channels with arbitrary real values of m. Simple and exact bit error rate (BER) expressions for integer and non-integer fading parameter m are derived by using the moment generating function (MGF) based analysis...
Antenna selection with less radio frequency (RF) chains could reduce the system cost and power consumption in wireless communications. Conventional antenna selection criteria such as signal-to-interference-plus-noise ratio (SINR) and minimum mean square error (MMSE) that are suitable for linear receivers could not provide optimal performance for ordered successive interference cancellation (OSIC)...
In this paper, two precoding algorithms based on channel orthogonalization have been proposed for multi-user MIMO downlink systems. Unlike other conventional methods, the first scheme obtains the orthonormal basis to achieve the precoding matrix by means of using Schmidt Orthogonalization method. In this way, the co-channel interference can be eliminated to some degree. The second algorithm increases...
In this paper we propose low complexity optimum transmit antenna selection algorithms for wireless spatial multiplexing (SM) systems. Antenna selection with less radio frequency (RF) chains could significantly reduce the system cost and power consumption. Antenna selection criteria such as maximum minimum signal to interference plus noise ratio (SINR) and MMSE require computation of matrix inverse...
In this paper we propose fast and efficient transmit antenna selection algorithms for wireless spatial multiplexing (SM) systems with linear receivers. Motivated by matrix inverse properties, a recursive matrix inverse calculation is developed for fast transmit antenna selection. Two selection criteria are proposed based on the recursive matrix inverse updating: one is the minimum mean square error...
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