Nokia Corporation

Nokia Solutions and Networks Oy

Saab Ab

Marko Kosunen

Kari Halonen

Jussi Ryynänen

Kari Stadius

Vesa Turunen

Kalle Spoof

Mikko Martelius

Jussi Ryynanen

Miikka Tenhunen

Jerry Lemberg

Enrico Roverato

Vishnu Unnikrishnan

Jussi RYYNÄNEN

A system () for beamforming of incoming radio-frequency signals is provided. The system includes at least one digital signal processor, DSP, a plurality of analogue-to-digital converters, ADC, each connected to the at least one DSP. Further, the system comprises a plurality of sample-and-hold, S&H, circuit groups, each comprising a plurality of sample-and-hold circuits additively connected to a respective ADC and a plurality of receiving antenna connections each connected to a respective S&H circuit in each group at one end and each antenna connection connected to a respective antenna. The system is configured to selectively alternate between a plurality of beamforming functionalities, wherein the receiver system is arranged to time-interleave the ADCs and control specific S&H circuits in each S&H group by at least one of time-interleave or disable specific S&H circuits depending on a set beamforming functionality. An associated method (100) is also provided.

Receiver system configured to alternate between different beamforming types

According to an aspect, there is provided a method for power-amplification of a transmission signal, comprising: obtaining the transmission signal with phase and amplitude modulation; generating a power-amplified polar signal for approximating a power-amplified transmission signal by power-amplifying a first constant-envelope signal with one of two or more first amplification factors based on the transmission signal; generating an outphasing pair of a first power-amplified outphasing signal and a second power-amplified outphasing signal based on the transmission signal; and combining the power-amplified polar signal, the first power-amplified outphasing signal and the second power-amplified outphasing signal to provide the power-amplified transmission signal.

Tri-phasing modulation for efficient and wideband radio transmitter

Apparatuses and methods for providing efficient spectrum sensing and signal detection using cyclostationary based spectrum sensing algorithms. A method embodiment is provided, comprising: receiving input samples of a signal having expected predetermined properties; transforming the input samples to angular form and obtaining data samples corresponding to at least one angle vector; performing a cyclostationarity test on the at least one angle vector, the cyclostationarity test being done entirely in an angular domain; wherein the cyclostationarity test comprises testing the at least one angle vector for a non-uniform distribution, the non-uniform distribution of the at least one angle vector indicating cyclostationarity in the input samples; and where cyclostationarity in the input samples is determined, refraining from transmitting radio frequency signals over an air interface at a frequency corresponding to the received signal. Apparatuses for implementing the methods are also disclosed.

Cyclostationary signal detection in the angular domain for communication systems

The present invention proposes a multiplier device performing multiplication of different powers of two serially in time (not in parallel) in order to further reduce the area needed for a hardware realization. By virtue thereof, it is enabled to use only one adder in connection with the multiplication which contributes to a reduced hardware amount and reduced required area for the hardware. A shifter means based on binary weighted shifting is used for shifting in connection with the multiplication, thereby reducing the required hardware amount (number of multiplexers and hardwired shifting elements) and thus reducing the area for hardware implementation still further. The present invention can be used in applications using digital multiplication, such as in digital signal processing DSP, digital filters and/or finite impulse response filters FIR filters as well as programmable and/or adaptive digital filters. As the multiplier is represented in CSD coding, the number of necessary shifting operations can be reduced and the number of necessary additions can be reduced, thus contributing to a reduced area needed for a hardware realization of a shifting means and a multiplier device on a silicon chip.

Multiplier and shift device using signed digit representation

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Helsinki, Finland

Marko Kosunen