Orthogonal synchronization has been a major problem in Cooperative Orthogonal Frequency Division Multiplexing (CO-OFDM) under the influence of both carrier frequency offset and timing offset with unknown channel gains. CO-OFDM network performance can be improved by employing Amplify-and-Forward (AF) relay strategy. The OFDM network comprises of many sub-carriers which requires an adjustment of ...

I introduce a new migration method that overcomes the limitations of common-azimuth migration while retaining its computational efficiency for imaging marine streamer data. The method is based on source-receiver downward-continuation of the prestack data with a narrow range of cross-line offsets. To minimize the width of the cross-line offset range, while assuring that all the recorded events a...

Fully integrated frequency-phase generators for a 6-18GHz wide-band phased-array receiver element are presented that generate 5-7GHz and 9-12GHz first LO signals with less than -95dBc/Hz phase noise at 100kHz offset. Second LO signals with digitally controllable fourquadrant phaseand amplitude spread with better than 3 resolution are generated and allow removal of systematic reference clock ske...

A multiple-input multiple-output (MIMO) wireless transmission system with continuous phase modulation (CPM) is considered. A novel MIMO CPM receiver with incoherent modulation is presented. The incoherent demodulation of CPM allows an uncomplicated handling of a frequency offset compared to coherent approaches requiring exact knowledge of the carrier frequency. Blind signal separation (BSS) is ...

Three component technologies were combined into a digital correlation microwave radiometer. The radiometer comprises a dual-channel X-band superheterodyne receiver, lowpower high-speed cross-correlator (HSCC), three-level ADCs, and a correlated noise source (CNS). The HSCC dissipates 10 mW and operates at 500 MHz clock speed. The ADCs are implemented using ECL components and dissipate more powe...

j a n u a r y / f e b r u a r y 2 0 1 1 www.insidegnss.com In satellite navigation, a GNSS receiver must account for several sources of error such as relativistic effects, atmospheric propagation delay, offset of satellite clocks from system time and satellite ephemeris. In order to accurately compute user position, velocity, and time (PVT), these errors need to be predicted/estimated precisely...

A 5.2-GHz CMOS receiver employs a double downconversion heterodyne architecture with a local oscillator frequency of 2.6 GHz and applies offset cancellation to the baseband amplifiers. Placing the image around the zero frequency, the receiver achieves an image rejection of 62 dB with no external components while minimizing the flicker noise upconversion in the first mixing operation. Realized i...

Improving interference robustness in Ultra-Low Power (ULP) receivers is a big challenge due to their low power budget. This paper presents an envelope detector based 915MHz 10kbps ULP receiver, which is fabricated in 65nm CMOS process for Wireless Sensor Networks (WSN) and Internet of Things (IoT). Two power-efficient techniques: Transmitted-Reference and Shifted Limiter, are proposed to improv...

In this paper, we study the channel estimation in the presence of the receiver in-phase and quadrature-phase (I/Q) imbalance and carrier frequency offset (CFO) for orthogonal frequency division multiplexing (OFDM) systems using pilot symbols. The concept of channel residual energy (CRE) [9] is used to solve the joint estimation problem. By minimizing the CRE, we can jointly estimate the receive...