The high quality PCS communications are enabled in environments where adjacent PCS service bands operate with out-of-band harmonics that would otherwise interfere with the system's operation. The highly bandwidth-efficient communications method combines a form of time division duplex (TDD), frequency division duplex (FDD), time division multiple access (TDMA), orthogonal frequency division multiplexing (OFDM), spatial diversity, and polarization diversity in various unique combinations. The method provides excellent fade resistance. The method enables changing a user's available bandwidth on demand by assigning additional TDMA slots during the user's session.

Method for frequency division duplex communications

A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.

Ofdma with adaptive subcarrier-cluster configuration and selective loading

The communication system includes a hybrid fiber/coax distribution network. A head end provides for downstream transmission of telephony and control data in a first frequency bandwidth over the hybrid fiber/coax distribution network and reception of upstream telephony and control data in a second frequency bandwidth over the hybrid fiber/coax distribution network. The head end includes a head end multicarrier modem for modulating downstream telephony information on a plurality of orthogonal carriers in the first frequency bandwidth and demodulating upstream telephony information modulated on a plurality of orthogonal carriers in the second frequency bandwidth. The system includes service units, operatively connected to the hybrid fiber/coax distribution network for upstream transmission of telephony and control data and for receipt of the downstream control data and telephony. Also provided is a method and apparatus for performing a Fast Fourier Transform (FFT).

Communication system with multicarrier telephony transport

A network architecture for wireless applications including a local radio network such as a wireless local area network (WLAN) which comprises a Wireless Mobile Centre (WMC) arranged to serve as a WLAN access point; a cellular networks such as a GSM network which comprises a Mobile Station (MS) in a form of dual-mode cellular phone to access both WLAN and GSM radio technologies, a Base Station (BS) arranged to convert a radio signal from the Mobile Station (MS) for communication, a Mobile Switching Centre (MSC) arranged to establish call connection; and a Handover Module implemented in either the Mobile Station (MS) or the Wireless Mobile Center (WMC) for providing seamless mobility between the GSM network and the wireless LAN, when the Mobile Station (MS) roams between the GSM network and the wireless LAN.

Gsm networks and solutions for providing seamless mobility between gsm networks and different radio networks

Disclosed is a method and system for dynamically selecting a communication channel between an access point (AP) and a plurality of stations (STAs) in an IEEE 802.11 wireless local area network (WLAN). The method includes the steps of: determining whether a new channel between the AP and STAs within a particular basic service set (BSS) is needed; requesting a channel signal quality measure to some of the plurality of stations by the AP; reporting a channel signal quality report back to the AP based on a received signal strength indication (RSSI) and a packet error rate (PER) of all channels detected by the stations within the BSS; selecting a new channel based on the channel quality report for use in communication between the AP and the plurality of stations.

Dynamic channel selection scheme for IEEE 802.11 WLANs

The method involves transmitting data symbols (d) in time slots (ts) over the radio interface between a base station (BS) and several mobile stations (MS) handled by the base station. An OFDMA multi-carrier method is used for the transmission of the data symbols, which assigns respectively several sub-carriers (oc) and a segment (S...) of a frequency spectrum to the mobile stations, to form a connection between base station and mobile station. The quality of different segments of the frequency spectrum is measured through each mobile station. At least one preferred segment, suitable for its own connection, is determined through each mobile station, and a corresponding information is transmitted to the base station. The information received from the mobile stations is evaluated through the base station, and a segment for the respective connection is assigned to each mobile station, dependent on the evaluation. An information about the assigned segment is transmitted to each mobile station through the base station.

Resource allocation in radio interface of radio communications system

For transmitting voice between subscriber stations of a radio system, particularly a mobile radio telephone system, whereby an analog voice signal is digitally coded by voice frames (S), the voice frames (S) are first converted into voice-coded voice frames (S1). Subsequently, a plurality of these voice frames (S1) is combined to form a multi-voice frame (MSF1). These multi-voice frames (MSF1) are transmitted with error-protection. At the reception side, the multi-voice frames (MSF4) are in turn divided into voice-coded voice frames (S4) and, subsequently, the digital voice information contained in the transmitted voice frames is in turn converted into an analog voice signal.

Method and arrangement for transmitting voice in a radio system

The invention relates to a radio system with frequency optimisation, especially a mobile radio system with radio base stations and subscribers (mobile stations or stationary stations) at low speed down to standstill. To avoid fluctuations and interruptions in the received level, the invention provides that in each subscriber station (mobile station or stationary station), the received levels and/or transmission quality of all frequencies or channels or of some of the frequencies or channels of the channels available to a radio base station are continuously measured and the measurement values are transmitted to the radio base stations, in which, from the total information, the frequencies or channels are allocated to the subscribers in such a manner that a most optimum frequency or transmission quality possible is allocated to each connection.

Radio system with frequency optimization

To transmit data in a radio network which comprises at least one base station and a plurality of subscriber stations and in which transmission occurs using slots of a time-division multiplex frame and frequency bands of a predetermined frequency range, the data allocated to a plurality of subscriber stations in each case undergo broadband transmission in a slot of the time-division multiplex frame and in a plurality of adjacent frequency bands by the JD (joint detection)-CDMA (code division multiple access) process known per se.

Verfahren und Anordnung zur Funkübertragung von digitalen Signalen

The invention relates to two methods and an arrangement for transmitting data via a radio interface which is organised into time slots with terminal message blocks in accordance with a TDMA user separation method. In the first method, radio stations emit at least two training sequences which are known to the receiving station, within one time slot. The receiving station uses said training sequences to carry out channel estimations. The training sequences are arranged in the time slot in such a way as to minimise the greatest interval from a data symbol to the next training sequence. In the second method, the radio stations emit at least one training sequence which is known to the receiving station, within one time slot. The receiving station uses this and at least one other known training sequence in at least one other time slot allocated to at least one other communications connection to carry out the channel estimations.

Methods and arrangement for transmitting data via a radio interface in a radiocommunications system

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