Nokia Corporation

Nokia Mobile Phones Limited

Venkatesh Vadde

Jakke Mäkelä

Steven Daniel Gray

Reza Serafat

Simon A Black

Kiran Kumar Kuchi

Jukka-Pekka Vihmalo

Jakke Sakari Makela

A method and system for optimizing energy consumption during data file read/write operations in a battery powered disk-based memory system is provided.

Method and system for arranging frequently accessed data to optimize power consumption

A power synthesizer is in several (n) discrete stages, each stage having a discrete amplitude, constant envelope amplifier coupled in series with a continuous phase modulator. Each modulator is actuated simultaneously, but not necessarily to modulate the signal phase similarly. For circuit power combining, the modulators are coupled to inputs of the amplifiers, while the separately modulated and amplified bits are combined prior to being fed to the antenna. For spatial power combining, each modulator is coupled to the input of an amplifier which in turn feeds one of several antennas. Each stage operates on one bit, and each successive nstage amplifies the input bit by a factor of a0/2. Preferably, a discrete amplitude generator converts an (analog) output of an IFFT block to a binary sequence, and each bit is fed to a separate stage. The power synthesizer converts a digital output of the discrete amplitude generator to analog at RF rather than at baseband, rendering a baseband DAC, and a separate upconverter, unnecessary.

Method and apparatus for discrete power synthesis of multicarrier signals with constant envelope power amplifiers

An assembly, and an associated method, for an ad hoc network, such as an independent basic service set defined in an IEEE 802.11 protocol specification. A channel map is created and maintained at each mobile station of the ad hoc network. The channel map is populated with channel characteristic indicia of channel frequencies that might be available upon which to be used in the ad hoc network to effectuate communications between the mobile stations. Information related to the channel map created and maintained at each of the mobile stations is exchanged, and any of the mobile stations is selectable to form a DFS owner that defines the channel frequency to be used upon which to define a communication channel for communications in the network.

Assembly, and associated method, for facilitating channel frequency selection in a communication system utilizing a dynamic frequency selection scheme

The invention relates to a device comprising a disk drivefor rotating a disk memory and at least one interface enabling a data flow between a rotating disk memory and at least one other module. In order to enable a comfortable use of such a device, it is proposed that the device further comprises meansfor setting the rotation speed of the disk drivebased on an indication of the data rate supported by an interface of the device, which interface is currently to be employed for enabling a data flow between the rotating disk memory and at least one other module. The invention relates equally to a method setting the rotation speed of a disk driveaccording to the capabilities of an interface enabling a data flow between a disk memory rotated by the disk driveand another module

Setting the rotation speed of a rotating disk memory

The system includes a transmitter for generating a signal in the time domain and transforming the signal to the frequency domain, wherein the transmitter suppresses a plurality of sub-carriers of the signal, The resulting truncated signal is transmitted to the receiver through a noisy channel. The receiver receives a noisy signal and recovers the carrier signal and, hence, the partial response signal from the noisy signal. The method includes selecting a cyclic convolver having predefined values, applying the cyclic convolver to a signal to produce a partial response signal, dropping a plurality of sub-carriers of the partial response signal, to generate a modulated carrier signal that is ready for transmission.

Frequency domain partial response signaling with high spectral efficiency and low peak to average power ratio

A system and method is proposed to significantly reduce the peak to average power ratio (PAPR) for an OFDM system by stabilizing the signal envelope. By using partial response (PR) signaling to spread each sub-symbol over multiple subcarriers, the signal is first compress in time. The signal is then rearranged such that it is possible to stabilize the envelope at some constant value &#x3b1;, thus improving the PAPR without using excessive time-bandwidth resources.

Envelope stabilization method and apparatus

The system includes a transmitter for generating a signal and a cyclic prefix, wherein the transmitter suppresses a plurality of sub-symbols of the signal to produce a partial response signal. A portion of the partial response signal is dropped and the resulting truncated signal is used to modulate a carrier signal. The carrier signal is transmitted to the receiver through a noisy channel. The receiver receives a noisy signal and recovers the carrier signal and, hence, the partial response signal from the noisy signal. The method includes selecting a cyclic convolver having predefined values, applying the cyclic convolver to a signal to produce a partial response signal, dropping a plurality of sub-symbols of the partial response signal, appending a cyclic prefix at a leading edge of the truncated partial response signal, and transforming the truncated partial response signal with the cyclic prefix to produce a time base signal that is used to generate a modulated carrier signal that is ready for transmission.

Partial response signaling for orthogonal frequency division multiplexing

A method and system for optimizing energy consumption during data read/write operations in a disk-based memory system is provided. The method includes the steps of reading a data clip length, Land determining an available energy-optimum recordable track segment.

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Fremont, CA, United States of America

Venkatesh Vadde