Other

Conexant Systems, Inc.

Discovision Associates

Matthew James Collins

Jonathan Parker

Peter Keevill

Thomas Foxcroft

David Huw Davies

John Matthew Nolan

Dawood Alam

Douglas Roger Pulley

The invention relates to a demodulator circuit in a communication system using a multi-carrier modulation scheme. The demodulator uses channel state information for respective carriers in the multi-carrier modulation to de-map the received data.

Demodulator circuit

A method and apparatus for a demodulator circuit in a communication system is described. The invention relates to a demodulator circuit in a communication system using a multi-carrier modulation scheme. The demodulator makes efficient use of channel state information for respective carriers in the multi-carrier modulation to de-map the received data. An efficient method of calculating channel state information is also disclosed.

Method and apparatus for a demodulator circuit

A receiver circuit is for processing a received signal which includes at least a first portion and a second portion which repeats the content of the first portion after a repeat interval. For example, the receiver may be for DVB-T signals using COFDM. Two correlation values are measured. The first is between the first portion of the received signal, delayed by the repeat interval plus a difference interval, and the second portion. The second is between the first portion of the received signal, delayed by the repeat interval minus a difference interval, and the second portion. Any difference between the correlation values represents a difference between the receiver sampling rate, and the required sampling rate, and can be used to adjust the receiver sampling rate.

Receiver circuit

The invention provides a single chip implementation of a digital receiver for multicarrier signals that are transmitted by orthogonal frequency division multiplexing. Improved channel estimation and correction circuitry are provided. The receiver has highly accurate sampling rate control and frequency control circuitry. BCH decoding of tps data carriers is achieved with minimal resources with an arrangement that includes a small Galois field multiplier. An improved FFT window synchronization circuit is coupled to the resampling circuit for locating the boundary of the guard interval transmitted with the active frame of the signal. A real-time pipelined FFT processor is operationally associated with the FFT window synchronization circuit and operates with reduced memory requirements.

Single chip VLSI implementation of a digital receiver employing orthogonal frequency division multiplexing

An over-center toggle latch comprises a latch for securing two members together having a latch housing affixed to one of the members and a keeper having a projecting member affixed to the other of the members. Inside the housing is a toggle, mounted within the housing for pivotal movement between a first position and a second position. In the second position, the projecting member of the keeper is retained within the housing. In the first position, the projecting member of the keeper is released from the housing. A retaining means disposed within the housing is in pivotal contact with the housing and the toggle for retaining the toggle in either of the first or second positions. A protruding tab is disposed on the retaining means. A switch having a two-position push button actuator is located in the housing such that when the toggle is in a first position, the push button actuator is in a first position, and when the toggle is in the second position, the push button actuator is in a second position. When the toggle is in the first position, the push button is actuated to a first position by the protruding tab disposed on the retaining means. When the toggle member is in the second position, the push button is actuated to a second position by the protruding tab.

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Bath, United Kingdom

Matthew James Collins