A communication apparatus includes a control unit. The control unit generates a radio signal including a first segment including transmission data and a second segment not including the transmission data, and transmits the radio signal via a plurality of propagation paths.

A mobile terminal simulator for a wireless telecommunications network includes: a simulation engine, providing a bit stream, according to a communications standard; a conversion stage, which converts the bit stream into a baseband signal in the frequency domain; a mapping and transformation stage, which generates transmission samples in the time domain as a function of the baseband signal; and a transmission module, connectable to a Base Radio Station of a wireless telecommunications network by a communication port. A transmission channel simulator module is connected between the conversion stage and the mapping and transformation stage and processes the baseband signal in the frequency domain so as to simulate a transmission channel between the communication port and the Base Radio Station.

A system that incorporates aspects of the subject disclosure may perform operations including, for example, receiving, via an antenna, a signal generated by a communication device, detecting passive intermodulation interference in the signal, the interference generated by one or more transmitters unassociated with the communication device, and the interference determined from signal characteristics associated with a signaling protocol used by the one or more transmitters. Other embodiments are disclosed.

Provided are a method, a system and a positioning location calculation device for realizing wireless positioning. The method includes: a positioning measurement device updating locally and statically stored PSS information according to movement information of the positioning measurement device when network connection is performed (200); receiving a positioning signal transmitted by each PSS in a band of a communication network on a determined wireless resource to obtain time information of the positioning signals transmitted by one or more PSSs (201); and calculating location information based on the time information about the positioning signals transmitted by the one or more PSSs and the PSS information according to a preset positioning mode (202).

A system that incorporates aspects of the subject disclosure may perform operations including, for example, receiving, via an antenna, a signal generated by a communication device, detecting passive intermodulation interference in the signal, the interference generated by one or more transmitters unassociated with the communication device, and the interference determined from signal characteristics associated with a signaling protocol used by the one or more transmitters. Other embodiments are disclosed.

The invention discloses a cyclic-Frequency shift orthogonal frequency division multiplex spread spectrum device, comprising: at least one communication device for performing the conversion between a series of bits and a frequency domain symbol out of a plurality of frequency combination patterns; wherein different patterns correspond to different bit values; and the device forms a cyclic frequency shift value utilizing a frequency reordering, each of the cyclic frequency shift values corresponding to a frequency combination pattern.

Methods and apparatus are disclosed for processing interference due to passive non-linear products of transmitted signals in a wireless network, and more specifically, but not exclusively, to reduction of interference caused to a receiver due to passive intermodulation (PIM) products generated from at least a first Multiple Input Multiple Output (MIMO) signal comprising first and second MIMO component streams at a first carrier frequency. In other scenarios, there may be two or more carrier frequencies combining to cause PIM, and each carrier frequency may have two or more MIMO component streams.

A method of selecting a codebook is disclosed. The method is performed in a network node and includes: determining whether to use single-user multiple-input-multiple output, SU-MIMO, or multi-user multiple-input-multiple output, MU-MIMO, in a cell (C1) controlled by the network node, and selecting, based on the determining, a first codebook or a second codebook for use in communication with a communication device within the cell (C1). The first codebook is configured for SU-MIMO communication and the second codebook is configured for MU-MIMO communication. A network node, computer program and computer program product are also disclosed.

A method and a receiving node for determining Time Of Arrival (TOA) for a radio signal received from a transmitting node in a wireless network. The receiving node detects the received radio signal by cross-correlating the received radio signal with a predefined reference signal transmitted by the transmitting node, to obtain a Cross-Correlated Function (CCF). The receiving node then estimates a set of candidate TOAs for respective signal components of the cross-correlated signal, and determines a final TOA for the received radio signal based on the set of candidate TOAs.

A system that incorporates aspects of the subject disclosure may perform operations including, for example, receiving, via an antenna, a signal generated by a communication device, detecting passive intermodulation interference in the signal, the interference generated by one or more transmitters unassociated with the communication device, and the interference determined from signal characteristics associated with a signaling protocol used by the one or more transmitters. Other embodiments are disclosed.