This article deals with time and frequency synchronization in the Long Range (LoRa) system based on preamble symbols. A thorough analysis of maximum-likelihood (ML) estimator delay (time offset) offset shows that resulting cost function is not concave. As a consequence a priori solution to maxi...

Orthogonal frequency-division multiplexing (OFDM) is the technique of choice in digital broad-band applications that must cope with highly dispersive transmission media at low receiver implementation cost. In this paper, we focus on the inner OFDM receiver and its functions necessary to demodulate the received signal and deliver soft information to the outer receiver for decoding. In Part I of ...

In this paper, we present the system design of an integrated receiver for the next generation high-speed mobile data communications based on OFDM. First an overview of the OFDM system suitable for mobile communications is described. The effects of non-ideal transmission conditions of the OFDM system including channel estimation errors, symbol timing offset, carrier and sampling clock offset, ph...

As the chip manufacturing process scales down to smaller nodes, random offsets due to the statistical variations of fabrication are undermining performance, especially for analog/mixed signal circuitry. This paper presents a methodology for offset cancellation for the receive path of a programmable logic device (PLD) integrated wide-range transceiver. The transceiver was designed and fabricated...

This paper explores the use of Higher Order Statistics for the recovery of the carrier phase and frequency offset in a QAM receiver operating in an additive Gaussian noise channel. The technique is based on newly established properties of the 3 and 4-order cumulants of the demodulated QAM signal. The resulting method may be thought of as higher-order extension of the second order automatic freq...

In recent years, in various sectors of our society, there have been nationalist stirrings which were crystallized and articulated by the late Claro M. Recto, There were jealous demands for the recognition of Philippine sovereignty on the Bases question. There were appeals for the correction of the iniquitous economic relations between the Philippines and the United States. For a time, Filipino ...

The atomic clocks orbiting around the earth in GPS satellites can be utilised by anyone to obtain accurate timing. All that is required is an inexpensive GPS receiver and a clear view of the sky. This has enabled a revolution in applications requiring synchronization such as cellular networks, telecommunications timing, digital TV and radio transmission, calibration laboratory systems and the i...

abstract study design . a retrospective radiographic review was undertaken in patients treated for ais. objectives. to determine the most important preoperative factors that affect on postoperative junctional kyphosis complication. methods sagittal spine profilewere measured on the standing radiographs before, after and in the last follow-up visit of the operated patients for ais. the following...