Texas Instruments Corporation

Intel Corporation

Leland Stanford Junior University

Timothy M Schmidl

Anand Ganesh Dabak

Srinath Hosur

Eko Nugroho Onggosanusi

Anuj Batra

Aris Papasakellariou

Mohammed Nafie

June Chul Roh

Alan Gatherer

Wenxun Qiu

Ramanuja Vedantham

Il Han Kim

Kumaran Vijayasankar

Swaminathan Sankaran

Taejoon Kim

Ariton E Xhafa

Sundararajan Sriram

Chaitali Sengupta

Mehmet Ali Donmez

Baher S Haroun

Jaiganesh Balakrishnan

Tarkesh Pande

Yan Hui

Gerd Schuppener

Siraj Akhtar

Srinivas Lingam

Minghua Fu

Reza Hoshyar

Tolga Dinc

Salvatore Luciano Finocchiaro

Donald C Cox

Yumin Zhang

Antonio F Mondragon-Torres

Steven P Pekarich

Mahmoud Abdelmoneim Abdelmoneim Elgenedy

Arvind Khandalu Raghu

Deric Wayne Waters

Tarik Muharemovic

Badri N Varadarajan

Zukang Shen

Manish Goel

Arvind Kandhalu Raghu

Oren E Eliezer

Gibong Jeong

John Charles Linn

Ariel Zaltsman

Mostafa Sayed Ibrahim

Suparna Datta

Xiaodong Wang

Rong Chen

A system and method for enhanced channel hopping sequence is described. A pseudo random channel hopping sequence is redistributed using certain system specific parameters for separating adjacent transmission channels within a predetermined number of consecutive transmission channel numbers in the random channel hopping sequence to improve inter-channel interference between adjacent transmission channels.

Enhanced channel hopping sequence

A method includes receiving a first plurality of symbols comprising complex portions. The method further includes applying conjugate symmetry to the first plurality of symbols, producing a second plurality of symbols comprising no complex portions. The method further includes transforming the second plurality of symbols using an inverse fast Fourier transform, producing a third plurality of symbols. The method further includes interpolating the third plurality of symbols, generating a short training field comprising at least one real portion of the third plurality of symbols, generating a long training field comprising at least one real portion of the third plurality of symbols, and transmitting the short training field and long training field in a WPAN.

Short and long training fields

In described examples of a signal equalizer, a first filter stage is configured to perform adaptive equalization of crosstalk between a first signal component and a second signal component of a complex signal. A second filter stage is coupled serially to the first filter stage. The second equalizer stage is configured to perform separate adaptive equalization of the first signal component and separate adaptive equalization of the second signal component.

Decomposed real-imaginary equalizer

A method of operating a network on a plurality of frequency hopping channels is disclosed. The method includes transmitting a beacon on a beacon channel different from the frequency hopping channels and receiving a request from a node to join the network in response to the beacon. The method further includes adding the node to the network in response to the step of receiving and communicating with the node on the plurality of frequency hopping channels after the step of adding.

Wideband beacon channel for frequency hopping systems

In described examples of a signal equalizer, a complex signal having a first signal component and a second signal component is received from a communication channel. Adaptive equalization of crosstalk between the first signal component and the second signal component is performed using a single complex tap of a feedforward equalizer. A feedforward filter with real only taps converts the channel into a minimum phase channel that has postcursor interference only so that a low complexity decision feedback filter with all complex taps can easily eliminate the postcursor interreference.

Adaptive equalizer with a real feedforward filter and a single complex feedforward tap

In described examples, a method of operating a transceiver with a transmitter and a receiver includes generating a frequency reference. In the transmitter: A phase locked loop (PLL) generates a first voltage controlled oscillator (VCO) control voltage responsive to the frequency reference. A VCO in the transmitter generates a transmitter VCO signal responsive to the first VCO control voltage, and the PLL is locked to the transmitter VCO signal. In the receiver: A signal is received. A receiver VCO generates a receiver VCO signal responsive to the first or a second VCO control voltage. The receiver VCO signal is multiplied by the received signal to generate an I component, and by the received signal phase shifted by 90&#xb0; to generate a Q component. The second VCO control signal is generated responsive to the I component and the Q component.

Transceiver carrier frequency tuning

A method of power saving for a wireless transceiver (FIGS.and) is disclosed. The transceiver has an active power mode () and a reduced power mode (). The transceiver is operated in the reduced power mode () and monitors transmissions from a remote wireless transmitter while in the reduced power mode. The transceiver identifies a transmission from the remote wireless transmitter by a transceiver identity included in the transmission (FIG., UE identification). The transceiver transitions to the active power mode () in response to identifying the transmission.

Turbo HSDPA system

In described examples, a method of operating a transmitter includes generating a frequency reference signal having a reference frequency and outputting the frequency reference to a phase locked loop (PLL) that includes a voltage controlled oscillator (VCO). The VCO output is locked to the frequency reference signal to form a carrier signal. The transmitter receives an I input signal, a Q input signal, and a direct current (DC) leaky carrier signal. Either the I input signal or the Q input signal is added to the leaky carrier signal. The carrier signal is modulated with the resulting two signals using an I-Q mixer to generate a modulated signal that includes an unmodulated carrier signal component. The modulated signal is then transmitted.

Carrier frequency recovery in a receiver

In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to transmit and receive data in a frequency band selected from the group consisting of: 402-405 MHz, 420-450 MHz, 863-870 MHz, 902-928 MHz, 950-956 MHz, 2360-2400 MHz, and 2400-2483.5 MHz.

PHY layer parameters for body area network (BAN) devices

A method of communicating in a wireless network including a plurality of nodes having communications devices including a first node, wherein at least one node utilizes a first physical layer (PHY) modulation, and at least one other node utilizes a second PHY modulation different from the first PHY modulation. The first node receives a PHY frame transmitted by one of the plurality of nodes, and identifies a PHY modulation type selected from the first PHY modulation and the second PHY modulation used in the PHY frame or to be used in a subsequently to be received PHY frame or frame portion. The first node decodes the PHY frame or the subsequently to be received PHY frame or frame portion using the PHY modulation type identified in the identifying step.

Wireless networks utilizing multiple modulations

Growing community of inventors

Dallas, TX, United States of America

Timothy M Schmidl