Redpine Signals, Inc.

Silicon Laboratories Inc.

Logeshwaran Vijayan

Partha Sarathy Murali

Dharani Naga Sailaja Sankabathula

Nagaraja Reddy Anakala

Sundaram Vanka

Sriram Mudulodu

Phanimithra Gangalakurthi

Venkat Mattela

Subba Reddy Kallam

Suryanarayana Varma Nallaparaju

A power saving receiver has a controller which is operative to remove power from the receiver when a threshold is exceeded during reception of a packet. The threshold level is formed by comparison of any of: signal energy of unoccupied subcarriers less the signal energy in occupied subcarriers; signal energy in a first range of occupied subcarriers compared to signal energy in a different range of occupied subcarriers; error vector magnitude from a first set of subcarriers to a second set of subcarriers in a different spectral region of the channel; cyclic prefix cross-correlation, or common phase error increase.

Same-channel interference detection and early receiver powerdown for OFDM signal processor

A wireless receiver powers up shortly before the expected arrival of a beacon frame, and upon detection of a beacon frame from an access point the station is associated with and determination of subsequent fields of interest, including at least a TIM field, the receiver powers down. At the previously identified fields of interest, the receiver powers up and uses previously stored values to continue packet demodulation, thereafter examining the TIM field to determine whether the AP has packets to transmit to the station.

Wireless receiver with field capture for beacon frames

A configurable network adapter has N analog front ends, each generating a receiver output and a transmitter input. In a first mode of operation, the analog front end receiver outputs are coupled to a MIMO equalizer, which is coupled to an outer receiver and to a first MAC input, with the first MAC having an output coupled to an outer transmitter, a MIMO modulator, and to the analog front end transmitter inputs. In a second mode of operation, one or more of the analog front ends is directed to a SISO modulator fed by a second outer transmitter coupled to a second MAC transmitter output. An associated one or more of the analog front end receivers is coupled to a SISO equalizer, and thereafter to an outer receiver and to the second lower MAC, thereby providing a first mode for a single MIMO adapter and a second mode for a MIMO plus independent PAN interface.

Reconfigurable multi-stream processor for multiple-input multiple-output (MIMO) wireless networks

An packet detection controller accepts an input from an AGC controller which indicates the presence of an increased signal energy and also completion of an AGC process and generates an output to suspend the AGC process. The packet detection controller also receives a plurality of IQ receiver streams and forms a single stream for use by a packet detector, which is controllable by an SNR_MODE indicating whether the signal to noise ratio is above or below a particular threshold, and a PD_RESET signal indicating that no packet detection should occur. The controller also receives a PACKET_DET signal indicating that packet detection is completed. The packet detection controller examines the incoming receiver streams and suspends AGC process if a packet detect is generated, or suspends the packet detector if an AGC process is required.

Level sensitive packet detector

Packet acquisition controller with signal strength threshold control for wireless MIMO receiver

A process for equalizing streams of OFDM subcarrier data computes the noise variance for each stream, and forms a stream weighting coefficient by equalizing the noise variance, such that for a first stream having a noise variance &#x3c3;and a second stream having a noise variance of &#x3c3;, the first stream is scaled by and the second stream is scaled by 

Stream weight estimation and compensation in SIMO/MIMO OFDM receivers

Method for setting inter-packet gain

Process for packet detection

A reduced complexity maximum likelihood decoder receives a stream of symbols Y and channel estimate H. A transformation converts Y and H into Z and R by computing matrix R, such that the product of R and Q produces matrix H. A second transformation column-swaps matrix H to form H', thereafter generating Q&#x2032; and R&#x2032; subject to the same constraints as was described for Q and R. Transformed variables Z and Z&#x2032; are formed by multiplying Y by Qand Q&#x2032;, respectively. Table entries with Z and R and Z&#x2032; and R&#x2032; have entries of all possible xaccompanied by estimates of xderived from xand Z, and similar entries of all possible xaccompanied by estimates of xderived from xand Z&#x2032;. Hard and soft decisions are made by finding the minimum distance metric of the combined entries of the first and second table.

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Chennai, India

Logeshwaran Vijayan