Receivers for coded orthogonal frequency-division multiplexed (COFDM) signals conveying the same coded data both in lower-frequency and upper-frequency sidebands thereof. Apparatus for performing a complex synchrodyne of COFDM signal to baseband is followed by apparatus for extracting the COFDM subcarriers of the lower-frequency and upper-frequency sidebands of the COFDM signal from the in-phase and quadrature-phase results of the complex synchrodyne. The COFDM subcarriers of the lower-frequency sideband as converted to baseband are supplied to apparatus for demodulating and demapping those subcarriers to recover a first set of coded data. The COFDM subcarriers of the upper-frequency sideband as converted to baseband are supplied to apparatus for demodulating and demapping those subcarriers to recover a second set of coded data. A diversity combiner combines the first and second sets of coded data for subsequent decoding.

Prior-art receivers for double-sideband coded orthogonal frequency-division modulation (COFDM) signal, such as receivers for digital television (DTV) broadcasting, have folded the frequency spectrum in half by synchrodyne to baseband before discrete Fourier transform (DFT) and de-mapping quadrature amplitude-modulation (QAM) of COFDM signal subcarriers, thus to improve signal-to-noise ratio by 6 dB. Single-sideband or independent-sideband COFDM receivers that perform DFT and demapping of QAM of COFDM signal subcarriers in an unfolded frequency spectrum can improve signal-to-noise ratio by 8.5 dB by maximal-ratio combining bits of demapping results. Such improvement is achieved even when such a receiver is arranged for receiving a DSB-COFDM signal, in which double-sideband signal the frequency spectra of the lower and upper sidebands mirror each other. Reception range is increased by about a third over that of receivers which fold the frequency in half during synchrodyne to baseband. Such increase in reception range is particularly important for DTV receivers using indoor antennas.

A method for allocating bandwidth to communication according to a first communication protocol, the method comprising identifying bandwidth that is allocated to a communication channel for communication according to a second communication protocol and which forms a guard band of the communication channel and allocating the identified bandwidth to communication according to the first communication protocol, said allocation being performed non-uniformly across the identified bandwidth such that an allocation of a first portion of the identified bandwidth, which is located closer to a communication according to the second communication protocol than a second portion of the identified bandwidth, is constrained to a greater extent than an allocation of the second portion of the identified bandwidth.

The present invention relates to a method and a device for adjusting a signal of a receiving device in a mobile communication system and, more specifically, to a method for adjusting a signal of a receiving device in a mobile communication system, the method comprising the steps of: receiving signals from at least two antennas; calculating at least one correlation value by using the received signals; obtaining a delay difference value between the signals based on the at least one calculated correlation value; and outputting adjusted signals generated by adjusting the received signals based on the obtained delay difference value.

The present disclosure is directed to methods and systems for providing a distributed radio communications network. Each of a first gateway and a second gateway may separately receive modulated signals comprising at least a portion of data from a first node of a plurality of geographically-dispersed nodes. The modulated signals may be wirelessly transmitted as radio frequency (RF) signals from the first node, the data gathered or generated by the first node at a first location. A server may receive the modulated signals from the first gateway and the second gateway. As configured by software-defined radio (SDR) software, the server may perform processing of the separately received modulated signals to recover the data. The processing may include demodulation of the modulated signals.

A wireless microphone or wireless in-ear monitoring system. The system has at least one transmitting and/or receiving unit, which comprises at least two antenna modules, each of the antenna modules having an output plug unit, as well as a combining unit with an input interface. Output signals of the at least two antenna modules are received via the input interface of the combining unit. This is done for those input plug units that are inserted into the input interface of the combining unit. This is carried out in order to execute diversity processing of the signals of the antenna modules.

A wireless base station that includes: a transmitter that employs a plurality of antenna elements to form a beam in each of a plurality of transmission directions and transmit a reference signal; a receiver that receives a value representing reception quality of the reference signal for a user device that has received the reference signal; a memory; and a processor connected to the memory, the processor being configured to employ an indicator value, representing reception quality for a user device group computed from values received by the receiver that represent reception quality for each of a plurality of user devices, in order to select a combination of beams to employ in user data transmission from the plurality of beams transmitted by the transmitter.

According to one embodiment of the present disclosure, a communication method of an AP using multiple antennas can be provided, comprising the steps of: setting two or more transmission descriptors including unit transmission information in which antenna combination information and transmission rate information are defined; transmitting a packet using one of the set transmission descriptors; receiving information indicating whether the transmitted packet is a success or not; and collecting the information indicating whether the transmitted packet is a success or not for a predetermined period to reset the transmission descriptors. In addition, an apparatus using the method can be provided.

A beamforming device is provided. The beamforming device comprises: a beam deriving unit for deriving, among multiple reception beams, a first reception beam receiving, from a terminal, the first largest reception signal and a second reception beam receiving, from the terminal, the second largest reception signal; and a control unit for estimating the direction of the terminal on the basis of a ratio value between the size of the reception signal received through the first reception beam and the size of the reception signal received through the second reception beam.

This invention relates to decorrelation of signals in order to improve coding gains of wireless communications. To this end a branch signal processor includes a summer to determine a sum of a first branch signal and a second branch signal to produce a sum signal. A conjugate swapper to determine a conjugate swap of the first branch signal and a conjugate swap of the second branch signal to produce two swapped signals, wherein the conjugate swapper takes an imaginary part of the first branch signal to become a real part and a real part of the first branch signal to become an imaginary part of a new complex signal which new complex signal becomes a first swapped signal, and wherein the conjugate swapper takes an imaginary part of the second branch signal to become a real part and a real part of the second branch signal to become an imaginary part of a second complex signal which second complex signal becomes a second swapped signal. A differencer determines a difference of the first swapped branch signal and the second swapped branch signal to produce a difference signal and a diversity combiner configured to combine the sum signal, the first branch signal, the second branch signal and the difference signal.