This paper extends a recently proposed space-time model for Rayleigh fading to a 2 transmit, 2 receive antenna (2, 2) multiple-input multiple-output (MIMO) channel with arbitrary spatial separation at the transmitter and at the receiver. The space-time correlation function for a non-isotropic scatterer distribution around the receiver is derived for the arbitrary configuration as a further exte...

This paper presents the study and simulation of IQ impairments influence in a Radio Frequency (RF) transmitter architecture. The context is the transmission of OFDM signals such as IEEE 802.11a. The transmitter architecture is considered in two cases : a classical reference case such as homodyne for example and a linearised case, based on the EER (Envelope Elimination and Restoration) or polar ...

—A cognitive interference channel consists of two single-user links, one licensed to use the spectral resource (primary) and one unlicensed (secondary or cognitive). According to the cognitive radio principle, the activity of the secondary link should not interfere with the performance of the primary. The cognitive transmitter is allowed to access the channel only when sensed idle. In this pape...

We consider a cognitive radio network scenario where a primary transmitter and a secondary transmitter, respectively, communicate a message to their respective primary receiver and secondary receiver over a packet-based wireless link, using a joint automatic-repeat-request (ARQ) error control scheme. The secondary transmitter assists in the retransmission of the primary message, which improves ...

Transmitter power control is a necessity to combat "near-far" problems in radio systems using receivers with limited "dynamic range" (such as conventional DSCDMA systems). Transmitter power control, however, can also be used to control cochannel interference, i.e. interference from other users using the same channel (code or time slot). For this purpose, it has been shown that the optimum trans...

Wireless Local Area Networks (WLANs) based on IEEE 802.11 standard have been rapidly growing. With limitations of the WLAN standard and rapid increase in wireless application demand, the air interface acts as bottleneck even in high-speed WLAN standards such as IEEE 802.11a and 802.11g with expected data transmission rates of up to 54 Mbps. To improve the overall performance of IEEE 802.11 WLAN...

This paper presents a quadrature digital transmitter operating in the Multi-Use Radio Service (MURS) frequency band for low power and long-range IoT applications. We introduce a narrowband modulation scheme compliant with the MURS band as an alternative solution for low data-rate wide-area coverage. We present a transmitter architecture based on switched-current PA cells that uses a digital cla...

1. Introduction To meet the challenge of 3D-intergration in future ULSI, global wireless interconnection (interconnect distance above 300 µm) which utilizes electromagnetic wave transmission by using integrated antenna and ultra wideband (UWB) transceiver system has been proposed [1, 2] as shown in Fig. 1. Among the different techniques for UWB system, impulse radio based UWB uses very short Ga...

We describe a UHF RFID reader which uses low cost off-the-shelf components such as MSP430 microcontroller and the TH7203x transmitter IC. The receiver circuit is based on envelope detector and analog data slicer. The design is very simple and can be used as an educational tool for academic

Advanced users of high frequency (HF) radio communications have long used systems known as chirpsounders 1 to obtain real-time information about the ionospheric propagation conditions of different communication channels between a transmitter and a receiver. Traditional chirpsounders are expensive to realize and lack the flexibility of state-of-the art digital radio platforms. However, the adven...