A method and apparatus for wireless communication are described. In one embodiment, a method for communicating with a subscriber comprises transmitting orthogonal frequency domain multiplexing (OFDM) signals to the subscriber, and receiving direct-sequence spread spectrum (DSSS) signals from the subscriber.

Communication system using OFDM for one direction and DSSS for another direction

A DMT system and method with the capability to adapt the system bit rate on-line in a seamless manner. The DMT system provides a robust and fast protocol for completing this seamless rate adaptation. The DMT system also provides a framing and encoding method with reduced overhead compared to conventional DMT systems. The DMT system and method provide seamless rate adaptation with the provision of different power levels. This framing and encoding method enables a system with seamless rate adaptation capability. The system and method of the invention can be implemented in hardware, or alternatively in a combination of hardware and software.

Seamless rate adaptive multicarrier modulation system and protocols

Method for seamlessly changing power modes in an ADSL system

A Discrete Multitone Modulation (DMT) system and method with the capability to adapt the system bit rate on-line in a seamless manner. The DMT system provides a robust and fast protocol for completing this seamless rate adaptation. The DMT system also provides a framing and encoding method with reduced overhead compared to conventional DMT systems. The DMT system and method provide seamless rate adaptation with the provision of different power levels. This framing and encoding method enables a system with seamless rate adaptation capability. The system and method of the invention can be implemented in hardware, or alternatively in a combination of hardware and software.

Method for synchronizing seamless rate adaptation

In a multicarrier communication system having a plurality of subchannels, a method and apparatus for supporting at least two applications. For example, the method includes associating at least a first application in a set of currently active applications with a first latency path, allocating at least one subchannel to the first latency path, and in response to a change in the set of currently active applications, allocating the at least one subchannel to a second latency path associated with a second application in the set of currently active applications and different from the first latency path.

Method and multi-carrier transceiver with stored application profiles for supporting multiple applications

PURPOSE: To realize an error correcting method where the speed-up of transmission speed is easy and the degradation of the error ratio of a frequency selective phasing is small, in an FDM transmission system. CONSTITUTION: A transmitter 301 is composed of (n) error correction encoders 101-1 to 101-n (n is ≥2) performing an error correction encoding for transmission data, a mapping circuit 102 outputting m of data arranged so as to disperse each of n encoded data sequence on a frequency axis or a time axis and an FDM modulator 103 outputting signal where m of data is modulated into each of m carrier waves and is multiplexed. Therefore, plural error correction encoders 101-1 to 101-n and a decoder are provided, the application of high transmission speed to a system is easy. Because the burst error by a selective fading is effectively dispersed by a mapping means, the reliability of decoded data is improved. When a user receives only part of data in a multiconnection and a broadcasting system, the miniaturization of a receiver and low power consumption is performed. COPYRIGHT: (C)1995,JPO

Tomoko Matsushima

Papers

Error correcting method of frequency division multiplexing transmission and transmission system using same