phase keying
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A Novel Coding Technique to Minimise the Transmission Bandwidth and Bit Error Rate in DPSK
White Paper This paper proposes a novel coding technique that aims to reduce the Transmission Bandwidth (BT) and Bit Error Rate (BER) vis-a-vis Conventional Differential Phase Shift Keying (CDPSK) in digital band pass transmission. [08 Jul 2008]
BER Minimized OFDM Systems With Channel Independent Precoders
White Paper In the case of MMSE receivers, it is shown that for quadrature phase shift keying (QPSK), there exists a class of optimal precoders that are channel independent. This paper considers the minimization of uncoded bit error rate (BER) for the... [03 Jul 2008]
Spreading Sequences for Uplink and Downlink MC-CDMA Systems: PAPR and MAI Minimization
White Paper The crest factor of orthogonal and non-orthogonal sequences are compared analytically and by simulation for downlink and uplink phase shift keying MC-CDMA transmissions. This paper deals with spreading sequences selection for downlink and uplink... [03 Jul 2008]
Integrated FSK Demodulator With Very High Sensitivity
White Paper This paper presents a fully integrated highly sensitive frequency-shift keying (FSK) demodulator functioning at a modulation factor of 0.5%-0.1% and below. A dual-feedback phase-locked loop approach provides both very high sensitivity and... [03 Jul 2008]
Frequency-Hopping Versus Interference Cancellation for TD-CDMA
White Paper The authors analyze Quadrature Phase Shift Keying (QPSK) modulation with coherent demodulation and multipath (frequency) diversity with Maximal Ratio Combining (MRC). The work discussed in this paper considers asynchronous Time Division Code... [03 Jul 2008]
Demodulators for a Zero-IF Bluetooth Receiver
White Paper Measurements and simulations prove that the detectors’ sensitivity lies close to an ideal coherent Gaussian frequency-shift keying (GFSK) detector. This paper presents low-complexity detectors for a zero-IF Bluetooth receiver based on a simple... [03 Jul 2008]
Performance of MT-CDMA System With Post-Detection Diversity Reception Over Rician Fading Channel
White Paper The system uses differential binary phase shift keying (DBPSK) modulation and post detection diversity combining, considering slowly Rician fading and frequency selective channel in the indoor environment. [10 Apr 2008]
Error Probability Minimizing Pilots for OFDM With M-PSK Modulation Over Rayleigh-Fading Channels
White Paper This paper analyzes the symbol error rate (SER) performance of OFDM with M-ary Phase-Shift Keying (M-PSK) modulation over Rayleigh-fading channels, in the presence of channel estimation errors. Orthogonal frequency division multiplexing (OFDM) with... [10 Apr 2008]
OFDM or Single-Carrier Block Transmissions?
White Paper It first compares their peak-to-average power ratio (PAR) and the corresponding power amplifier backoff for phase-shift keying or quadrature amplitude modulation. This paper compares two block transmission systems over frequency-selective fading... [10 Apr 2008]
Improving Testing Capability of Interoperability for Link-11 by Building a Gateway for a TCP/IP Network
The standard employs the digital modulation technique Differential Quadrature Phase Shift Keying (DQPSK) to encode formatted binary messages (M-series messages) onto an audio channel, which are then modulated and transmitted over a radio... [06 Dec 2007]
Improving Testing Capability of Interoperability for Link-11 by Building a Gateway for a TCP/IP Network
White Paper The standard employs the digital modulation technique Differential Quadrature Phase Shift Keying (DQPSK) to encode formatted binary messages (M-series messages) onto an audio channel, which are then modulated and transmitted over a radio... [05 Dec 2007]
Understanding Upstream Modulation Profiles
White Paper Many upstream modulation profile variables can be changed, such as guard time of the burst, preamble, modulation (quadrature phase shift keying [QPSK] or 16-quadrature amplitude modulation [QAM]), and forward error correction (FEC) protection. [27 Nov 2007]
The Effectiveness of Signal Clipping for PAPR and Total Degradation Reduction in OFDM Systems
White Paper This paper analyzes clipped M-ary differentially encoded phase-shift keying (M-DPSK) OFDM. Signal clipping has been suggested as an effective Peak-to-Average Power Ratio (PAPR) reduction scheme for orthogonal frequency-division multiplexing (OFDM). [11 Apr 2007]
Performance Degradation of OFDM Systems Due to Doppler Spreading
White Paper For conventional modulation methods such as Phase-Shift Keying (PSK) and Quadrature-Amplitude Modulation (QAM), the bivariate probability density function (pdf) of the ICI is shown to be a weighted Gaussian mixture. [11 Apr 2007]
PAPR Reduction Methods for Noncoherent OFDM-MFSK
White Paper MFSK (M-ary Frequency Shift Keying) can be combined with OFDM (Orthogonal Frequency Division Multiplexing) by grouping the subcarriers into groups of M and applying MFSK modulation to each groups. The noncoherent detection of OFDMMFSK allows an... [11 Apr 2007]
