We consider a downlink two-hop MISO broadcast network with a 2-antenna source communicating to 2 singleantenna destinations, assisted by 2 single-antenna intermediate relays. We investigate spectrally efficient transmission schemes and their achieved sum degrees of freedom (DoF), with quantized delayed channel state information (CSI) feedback. Assuming Grassmannian vector quantization, we study...

Cooperative diversity has emerged as a promising technique to combat fading in wireless communications (Sendonaris et. al., 2003a; Sendonaris et. al., 2003b). It is based on the broadcast nature of the wireless medium and enables single-antenna users to “enjoy” space diversity benefits by sharing their physical resources through a virtual transmit and/or receive antenna array. The basic relay c...

OFDM suffers from a high peak-to-average power ratio (PAR) of the transmit signal. This issue becomes even more important when considering multi-antenna systems. In this paper PAR reduction schemes for the multi-antenna broadcast scenarios are assessed. Hereby, the scheme Selected Sorting (SLS) is introduced and analyzed in terms of PAR reduction performance, error performance, and computationa...

A new approach for multi-antenna broadcast channels in cellular networks based on multiuser diversity concept is introduced. The technique called Opportunistic Interference Management (OIM), achieves Dirty Paper Coding (DPC) capacity asymptotically with minimum feedback required. When there are K antennas at the base station with M mobile users in the cell, the proposed technique only requires ...

We characterize the degrees of freedom ηX in a system with two multiple antenna transmitters and two multiple antenna receivers. With M antennas at all nodes we find ⌊ 4 3 M⌋ ≤ ηX ≤ 4 3 M . The MMK scheme [1] built upon successive decoding and/or dirty paper coding schemes is known to achieve the ⌊ 4 3 M⌋ degrees of freedom. Interestingly, we find that simple zero forcing without dirty paper en...

The authors have attempted to influence an embedded square split ring resonator (SSRR) response in a stacked non-homogeneous substrate demonstrate quad-band antenna. purpose is produce multiband operations of microstrip patch highlighted factor the effect embedding SSRR and differing relative permittivity on side length SSRR. analysis shows that dual produces multiple bands compared single ante...

We consider the time-correlated multiple-antenna interference channel where the transmitters have (i) delayed channel state information (CSI) obtained from a latency-prone feedback channel as well as (ii) imperfect current CSIT, obtained e.g. from prediction on the basis of these past channel samples. We derive the degrees of freedom (DoF) region for the two-user multiple-antenna interference c...

We study the K = 3 user multiple input single output (MISO) broadcast channel (BC) with M = 3 antennas at the transmitter and 1 antenna at each receiver, from the generalized degrees of freedom (GDoF) perspective, under the assumption that the channel state information at the transmitter (CSIT) is limited to finite precision. In particular, our goal is to identify a parameter regime where a sim...

1 Abstract—The broadcast nature of wireless communications makes it vulnerable to attack or eavesdropping. Therefore, information security is an important issue in wireless communications, especially in distributed networks such as wireless sensor networks and ad hoc wireless networks. In this paper, we present the physical layer secrecy performance analysis of singleinput single-output (SISO) ...