Telia Ab

Telia Research Ab

Roger Larsson

Bo Engstrom

Christer Ostberg

Mattias Wahlqvist

Mikael Isaksson

Lennart Olsson

Sven-Rune Olofsson

Michael Unneback

Goran Oqvist

A method and apparatus increase a maximum available bit rate on a single data link, in order to gain capacity within single cells. An orthogonal frequency division multiplex signal is filtered by a pulse shaping operation so as to suppress side lobes of the signal. This pulse shaping introduces known inter symbol interference (ISI) and loses orthogonality between subcarriers. However, a receiver utilizes the idea of overcoming ISI by applying equalization to the signal such that the loss of orthogonality is overcome.

Orthogonal frequency division multiplex systems

Method for synchronization of transmitter and receiver at mobile radio

A random access protocol system and method for communicating between a mobile station and a base station in a multi-access digital radio communication system, including the steps of cyclically repeating a random access sequence and transmitting each cyclically repeated random access sequence in an orthogonal frequency division multiplex format from the mobile station as an uplink transmission.

Random access orthogonal frequency division multiplex system and method

Arrangement in a multi-user system

Growing community of inventors

Lulea, Sweden

Roger Larsson