Abstract: A system and method using multiple request to send (RTS) messages to enhance wireless communication resource allocation. The system and method operates a receiver to receive an RTS message from a station operating in, for example, a very high throughput wireless local area network, and in response, to transmit an ask for request (AFR) message. The receiver can receive multiple RTS messages and in response, issue respective AFR messages, to thus perform RTS negotiation of resources for access by the stations. If the receiver fails to receive any further RTS messages due to, for example, collision of RTS messages sent by multiple stations or failure of any other stations to send an RTS message, the receiver can then issue a clear to send (CTS) message indicating to all stations that have sent an RTS message that they are clear to send to the receiver using the information contained in the AFR message.

Abstract: A wireless communication unit includes a transmitter, a receiver, a selectivity element and a baseband processing module. The receiver has at least one summation module arranged to add a cancellation signal to the quadrature baseband receive signal. a baseband processing module arranged to: receive the quadrature baseband transmit signal and quadrature baseband receive signal; apply independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and apply the independent cancellation signals to the at least one summation module.

Abstract: A wireless communication unit includes a transmitter for processing a baseband transmit signal to produce a first radio frequency signal. A receiver is arranged to convert a second radio frequency signal to a baseband receive signal, where the receiver has a summation module arranged to add a cancellation signal to the baseband receive signal. A selectivity element is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal. An adaptive estimator module has a filter for filtering the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module.

Abstract: A wireless local area network comprising an access point and a plurality of remote stations arranged to communicate using Orthogonal Frequency Division Multiplex (OFDM). The system can operate in a first access mode wherein access to the access point is in accordance with a Carrier Sense Multiple Access (CSMA) scheme and in a temporary second access mode wherein access to the access point is in accordance with a Time Division Multiple Access (TDMA) scheme. A resource allocation of resource blocks when in the TDMA mode is furthermore such that resource blocks may be allocated to a plurality of remote stations which have overlapping time intervals and disjoint sets of OFDM subcarriers thereby allowing simultaneous communication for the plurality of remote stations within the overlapping time interval. The access operation is controlled by a single message transmitted from the access point. The invention may in particular be suitable for IEEE 802.11 systems.

Abstract: A wireless communication unit includes a transmitter for processing a baseband transmit signal to produce a first radio frequency signal. A receiver is arranged to convert a second radio frequency signal to a baseband receive signal, where the receiver has a summation module arranged to add a cancellation signal to the baseband receive signal. A selectivity element is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal. An adaptive estimator module has a filter for filtering the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module.

Abstract: A wireless communication unit includes a transmitter, a receiver, a selectivity element and a baseband processing module. The receiver has at least one summation module arranged to add a cancellation signal to the quadrature baseband receive signal. a baseband processing module arranged to: receive the quadrature baseband transmit signal and quadrature baseband receive signal; apply independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and apply the independent cancellation signals to the at least one summation module.

Abstract: A wireless local area network comprising an access point and a plurality of remote stations arranged to communicate using Orthogonal Frequency Division Multiplex (OFDM). The system can operate in a first access mode wherein access to the access point is in accordance with a Carrier Sense Multiple Access (CSMA) scheme and in a temporary second access mode wherein access to the access point is in accordance with a Time Division Multiple Access (TDMA) scheme. A resource allocation of resource blocks when in the TDMA mode is furthermore such that resource blocks may be allocated to a plurality of remote stations which have overlapping time intervals and disjoint sets of OFDM subcarriers thereby allowing simultaneous communication for the plurality of remote stations within the overlapping time interval. The access operation is controlled by a single message transmitted from the access point. The invention may in particular be suitable for IEEE 802.11 systems.

Abstract: A system and method using multiple request to send (RTS) messages to enhance wireless communication resource allocation. The system and method operates a receiver to receive an RTS message from a station operating in, for example, a very high throughput wireless local area network, and in response, to transmit an ask for request (AFR) message. The receiver can receive multiple RTS messages and in response, issue respective AFR messages, to thus perform RTS negotiation of resources for access by the stations. If the receiver fails to receive any further RTS messages due to, for example, collision of RTS messages sent by multiple stations or failure of any other stations to send an RTS message, the receiver can then issue a clear to send (CTS) message indicating to all stations that have sent an RTS message that they are clear to send to the receiver using the information contained in the AFR message.