Analog 28 GHz LoS MIMO Relay System Using a 90° Hybrid Coupler

Electronically tunable lumped element 90 hybrid coupler

Introduction: With the increasing variety of commercial wireless applications, there is now a requirement to incorporate several transceivers into a single hardware device [1]. To achieve high integration and minimise costs, it is an advantage to design transceivers that can be reconfigured for different frequency bands or share common blocks, rather than implementing the transceivers separatel...

Short-Slot Hybrid Coupler in Gap Waveguides at 38 GHz

Hybrid Transmission Scheme for MIMO Relay Channels

To improve the achievable rate for the MIMO channels, we propose a hybrid transmission (HT) scheme that mixes half-duplex decode-and-forward cooperative relaying transmission (DFRH)with direct transmission (DT). In the HT scheme, the source message is divided into two parts: one is transmitted by DFRH scheme and another is transmitted by DT scheme. Precoding and decoding are considered to conve...

A 90 Ghz Photoinjector

Photocathode rf guns depend on mode locked laser systems to produce an electron beam at a given phase of the rf. In general, the laser pulse is less than σz = 10° of rf phase in length and the required stability is on the order of ∆φ = 1°. At 90 GHz (W-band), these requirements correspond to σz = 333 fsec and ∆φ = 33 fsec. Laser system with pulse lengths in the fsec regime are commercially avai...

Hybrid Communication System using MIMO - OFDM

The enormous growth for Wireless broadband services and huge take up of mobile technology demands for higher data rate services.For a communication network to be successful only provisioning of high data rates alone is not sufficient, but also should provide wide coverage.Both satellite and terrestrial networks cannot guarantee this on their own. This incapability is attributed to capacity of c...