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Spreading Sequences for Uplink and Downlink MC-CDMA Systems: PAPR and MAI Minimization
White Paper This paper deals with spreading sequences selection for downlink and uplink Multi-Carrier Code Division Multiple Access (MC-CDMA) systems with the aim of minimizing the dynamic range of the transmitted multicarrier signal envelope and the multiple... [03 Jul 2008]
Constant Envelope OFDM Phase Modulation: Spectral Containment, Signal Space Properties and Performance
White Paper A class of constant envelope OFDM phase modulated (OFDM-PM) signals is studied. The motivation behind OFDM-PM is to alleviate the high peak-to-average power ratio of conventional OFDM systems. Power density spectrum plots and fractional out-of-band... [10 Apr 2008]
Constant Envelope Binary OFDM Phase Modulation
White Paper These constant envelope OFDM based signals guarantee a 0dB PAPR thus are well suited for efficient nonlinear power amplification. This paper focuses on binary OFDM phase modulation, which is a special case of OFDM angle modulation. [10 Apr 2008]
Constant Envelope OFDM With Channel Coding
White Paper This paper studies the application of convolutional coding to Constant Envelope Orthogonal Frequency Division Multiplexing (CE-OFDM). The noise at the output of the phase demodulator (in the CE-OFDM receiver) is shown to be approximately Gaussian... [11 Apr 2007]
A Comparision of OFDM and Non-Linear SC/FDE Signals: Non-Linear Amplification
White Paper In contrast to OFDM (Orthogonal Frequency Division Multiplexing), SC/FDE (single carrier transmission with frequency domain equalization) allows to apply signal formats with constant envelope, such as CPM (Continuous Phase Modulations) or at least... [11 Apr 2007]
Noncoherent Reception of Constant Envelope OFDM in Flat Fading Channels
White Paper A noncoherent Constant Envelope Orthogonal Frequency-Division Multiplexing (CE-OFDM) receiver is proposed. It is shown that CE-OFDM is naturally noncoherent since the effect of an unknown phase shift at the receiver is eliminated by the matched... [11 Apr 2007]
Doherty Amplifier With DSP Control to Improve Performance in CDMA Operation
White Paper DSP is used to dynamically adjust the gate bias of the auxiliary (peaking) amplifier at the rate of the signal envelope to obtain gain flatness (i.e. Furthermore, DSP is used as a digital predistortor to improve the overall linearity by adjusting... [14 Feb 2006]
Overcoming Peak-to-Average Power Ratio Issues in OFDM Via Carrier-Interferometry Codes
White Paper This paper shows how Carrier Interferometry phase coding eliminates peaks in the signal envelope and in effect the problems associated with large PAPR. OFDM (Orthogonal Frequency Division Multiplexing) is susceptible to high peak-to- average power... [16 Oct 2004]
A Note on the Application of the Laurent Decomposition to the GSM GMSK Signaling Waveform
White Paper The GMSK signaling waveform is a constant envelope phase modulated sinusoid. It is fairly easy to generate and the constant envelope property allows it to be transmitted using relatively efficient amplifiers. [24 Feb 2004]
Concerns about Gene Transfer and Nuclear Transfer in Domestic Animals
White Paper This oocyte does not allow nuclear envelope breakdown or a new zygotic one-cell DNA replication S phase of the cell cycle. An S phase and DNA replication will occur. In mice, the cell fusion studies of Fulka et al.show that the mouse oocyte during... [24 Feb 2004]
