Abstract: A receiver for use in a wireless network comprising a communications channel and a method of allocating deinterleaver memory usage in the receiver, wherein the receiver comprises a processor adapted to organize subchannels of the communications channel and set a number (N) of data bits per soft decision, wherein the soft decision is represented by N data bits; an address decoder adapted to decode the subchannels; a demapper adapted to receive QAM symbols and demap the QAM symbols to soft decisions; a deinterleaver adapted to perform deinterleaving on the soft decisions, wherein the deinterleaver comprises a memory component having a storage size that is a function of the number (N) of bits per soft decision; and a Viterbi decoder adapted to decode the deinterleaved soft decisions.

Abstract: Protocol stack layer processing for a MediaFLO™ mobile multimedia multicast system comprising a transmitter comprising a host processor and a host memory component. The processing includes a receiver that receives a wireless data stream comprising a MediaFLO™ mobile multimedia multicast system superframe comprising any of audio, video, and text media frames arranged in multiplexed Multicast Logical Channels (MLCs) and received from the transmitter, wherein each MLC is divided into 16 byte data packets, and wherein each MLC carries up to three logical sub-channels comprising stream 2, stream 1, and stream 0; and an Application Specific Integrated Circuit (ASIC) memory component operatively connected to the receiver, wherein the ASIC memory component performs processing of the data packets using hardware components comprising, a Medium Access Control (MAC) layer core; a stream layer core; a decryption layer core; a defragmentation layer core; and a sync layer core.

Abstract: A system and method of detecting the location and magnitude of multi-path echoes in a channel impulse response by going through the channel impulse magnitude response only once and detecting all the multi-path echoes, both location and magnitude, according to certain threshold criteria. The impulse magnitude response samples are processed on-the-fly (on demand) and do not require the storage of the entire channel impulse magnitude response which makes it ideal for ASIC implementation.

Abstract: A method and apparatus for de-interleaving interleaved data in a deinterleaver memory in an Orthogonal Frequency Division Multiplexing (OFDM) based Integrated Services Digital Broadcasting Terrestrial (ISDB-T) receiver. In different embodiments, the apparatus comprises of a OFDM symbol counter along with a divider or a buffer pointer RAM with circular pointer logic, a first lookup table to obtain delay buffer size and interleaving lengths for a given OFDM transmission layer, and a second lookup table to obtain buffer base address and interleaving lengths for a given OFDM transmission layer.

Abstract: An apparatus and method for WIC/LIC estimation without channel mode construction in a MediaFLO™ system comprising a receiver, a transmitter and transmission channel, wherein the method comprises receiving a signal comprising a MediaFLO™ mobile multimedia multicast system superframe comprising WIC/LIC symbols; setting a first sparseness index value of the digital signal to zero; setting a local copy WIC/LIC number of the digital signal to one; generating a local copy of all possible values of the WIC/LIC symbols corresponding to a WID/LID value from zero to fifteen; dividing the received WIC/LIC symbol values by a local copy WIC/LIC value corresponding to WIC/LIC number one; performing an IFFT of all the possible values of the WIC and LIC symbols; calculating a second sparseness index value of the IFFT of sixteen possible values of the WIC/LIC symbols; and extracting a WIC/LIC symbol from the digital signal corresponding to the second sparseness index.

Abstract: A system and method of performing re-synchronization for a Digital Video Broadcasting over Handheld (DVB-H) receiver comprises performing a time division multiplexing (TDM) data burst transmission sequence on bits of data received by the DVB-H receiver; performing a data bit re-synchronization sequence on the DVB-H receiver; and reducing a re-acquisition time at every stage of the data bit re-synchronization sequence, wherein the reducing process results in a reduction in the time to perform the re-synchronization for the DVB-H receiver, wherein the reduction in the time to perform the re-synchronization for the DVB-H receiver is greater than one-half of the time required to perform the re-synchronization for the DVB-H receiver absent the reducing of the re-acquisition time at every stage of the data bit re-synchronization sequence.

Abstract: A system and method of performing re-synchronization for a Digital Video Broadcasting over Handheld (DVB-H) receiver, wherein the method comprises performing a time division multiplexing (TDM) data burst transmission sequence on bits of data received by the DVB-H receiver; performing a data bit re-synchronization sequence on the DVB-H receiver; removing an on-chip timer and internal state registers in the DVB-H receiver; and allowing the DVB-H receiver to power off in between receipt of data bursts. Preferably, the removing process reduces the time to perform the re-synchronization in the DVB-H receiver. Preferably, the data bit re-synchronization sequence comprises performing an automatic gain control (AGC) lock process; performing a mode and guard detecting process; performing a frequency offset estimation process; performing a transmit parameter signaling (TPS) detection process; performing a timing and carrier loop lock process; and performing an equalizer delay process.

Abstract: An electrical circuit and method of power management of a cellular telephone includes a battery adapted to produce a battery voltage; a LDO regulator operatively connected to the battery and adapted to provide a constant supply voltage from the battery voltage; and a DC-DC converter operatively connected to the LDO regulator, wherein the DC-DC converter is adapted to step down the constant supply voltage to a lower voltage level, wherein the LDO regulator and the DC-DC converter are embedded on a single integrated circuit chip. The constant supply voltage equals 3.6V at an output of the LDO, and the constant supply voltage is applied to an input of the DC-DC converter. Moreover, the battery voltage equals at most 5.5V.

Abstract: Detecting Null symbols in a video data frame comprises sending OFDM symbols through a sliding windowed correlation process having a correlation window length proportional to a cyclic prefix length and a delay equal to a FFT size of the symbols, wherein output peaks of the process occur where two similar portions of the symbols coincide; checking peaks in windows sized equal to a duration of a symbol; determining whether the peaks are located in the middle of the windows; determining whether a shift has occurred in the location of the peak of a current window compared to in a second immediately previous window; determining whether the peak in a first immediately previous window is weak compared to that in a second immediately previous window; and declaring that a Null symbol exists in the first previous window when the shift has occurred and the determination of a weak peak exists.

Abstract: A system, method, and electrical circuit comprises a LNA signal line path comprising a LNA and a first signal mixer operatively connected to the LNA. The circuit further comprises an attenuator signal line path comprising an attenuator and a second signal mixer operatively connected to the attenuator; a radio frequency (RF) power detector operatively connected to an output of each of the LNA and the attenuator, wherein the RF power detector is adapted to vary a front end power gain of the electrical circuit; and logic circuitry operatively connected to the RF power detector, wherein the logic circuitry is adapted to (i) select transmission of a signal through only one of the LNA signal line path or the attenuator signal line path, and (ii) output the selected signal.

Abstract: ICI canceling in an OFDM system includes taking a FFT of a wireless electrical signal to produce an OFDM signal; estimating a DC component of a frequency-selective channel in the OFDM system; obtaining an initial estimate of data symbols associated with data bits of the OFDM signal; correcting the data bits with a Viterbi decoder; encoding the corrected data bits to acquire corrected data symbols; re-estimating the DC component of the frequency-selective channel using the corrected data symbols; filtering the corrected data symbols and sub-carrier of the frequency-selective channel; calculating a first order differential function of the frequency-selective channel based on successive ones of the corrected data symbols; removing an ICI component from the calculated first order differential function; and re-estimating the data symbols as a function of the removed ICI component. The filtering occurs using a low pass filter comprising a bank of eight filters.

Abstract: A method and system for coherent detection in which an OFDM symbol is multiplied by the complex conjugate of the previous OFDM symbol, which is obtained by one OFDM symbol delay and a complex conjugation circuit. This soft decision is passed through a QPSK slicer to obtain a hard decision. The soft decision is then divided by the hard decisions. The channel phase change between the two OFDM symbols is then obtained. For the first OFDM symbol, the channel is computed. A channel estimate for each ODFM symbol is computed from corresponding channel estimates and channel phase difference estimates. The channel phase difference between each two OFDM symbols is computed. The channel phase difference is passed through an exponent operation and multiplied by the soft decision to obtain a refined soft decision that is then passed through another QPSK slicer to obtain the final hard decision.

Abstract: A method of creating a visual program guide for use on a TDM mobile TV receiver comprises receiving a RF signal associated with a TV channel; demodulating all of the received RF signals associated with the TV channels; decoding all of the demodulated received RF signals corresponding to all the TV channels simultaneously; and creating the visual program guide as a consolidated view of each of the decoded TV channels, wherein the simultaneous decoding of the demodulated received RF signals significantly reduces a power consumption level and a memory utilization level in the receiver.

Abstract: A system and method for performing stepped automatic gain control (AGC) for orthogonal-frequency-division-multiplexing (OFDM) applications comprises a radio frequency (RF) tuner and an OFDM demodulator operatively connected to the RF tuner, the OFDM demodulator comprising logic circuitry adapted to (i) detect OFDM symbols from a stream of data; (ii) detect boundaries of the OFDM symbols; (iii) detect a cyclic prefix duration of data values associated with the OFDM symbols; and (iv) provide a feedback to the RF tuner of the information pertaining to the boundaries of the OFDM symbols and the cyclic prefix duration.

Abstract: Digital autonomous AGC for a DVB-H receiver comprises detecting a plurality of RF signals entering a LNA in the DVB-H receiver; detecting a RF transmitter blocker signal occurring at the LNA; and differentiating between a desired RF signal and an undesired RF transmitter blocker signal by varying a differential gain of current through the LNA. A RF servo loop is used for detecting the RF transmitter blocker signal. Logic circuitry of the RF servo loop is integrated with a baseband AGC loop to step control the differential gain of current through the LNA. A RF wideband detector is used for detecting the plurality of RF signals entering the LNA; and sending a voltage output corresponding to voltage levels of the RF signals to a plurality of comparators, wherein each of the plurality of comparators are set at a different programmable voltage threshold level compared with one another.

Abstract: Address generation for interleaving in a wireless communication system includes at least one input generation module to generate at least one input signal. A first address generator module and a second address generator module generate a first output address for interleaving and a second output address for interleaving. A selector module selects an address for interleaving from the first and the second output address based on predetermined criteria. At least one input translation module is receives an input signal and translate the received input signal to generate a nominal input signal based on a value of the received input signal. An address generation module generates an address for interleaving based on the nominal input signal.

Abstract: An apparatus and method for estimating Doppler frequency in a wireless communication network, wherein the method comprises determining a first correlation coefficient (c1) between a currently received Orthogonal Frequency Division Multiplexed (OFDM) symbol and an OFDM symbol received previous to the currently received OFDM symbol, and a second correlation coefficient (c2) between the currently received OFDM symbol and an OFDM symbol received immediately previous to the OFDM symbol received previous to the currently received OFDM symbol; performing a leaky integration across OFDM symbols of the resulting first and second correlation coefficients (c1, c2) to obtain an estimate of the first and second correlation coefficients; dividing the second correlation coefficient (c2) by the first correlation coefficient (c1) to obtain a correlation coefficient ratio; and using the correlation coefficient ratio as an estimate of the Doppler frequency in the wireless communication system.

Abstract: An apparatus and method of applying a superfast algorithm to a pilot-based channel estimation process includes receiving a signal comprising information bits transmitted in a wireless channel, executing the pilot-based channel estimation process having p structures for a vector of pilot structures and an upper bound N for a channel spread, determining a result of a matrix inversion of a channel correlation matrix for an error channel estimation offline without performing a matrix inversion, storing pilot information of the received signal for channel recovery in a transform domain, representing the Toeplitz inverse by a FFT representation, detecting and estimating nonzero taps of a channel impulse response of the wireless channel, obtaining a non-structured minimum mean-square-error (MMSE) estimate as a first estimate of locations of the nonzero taps, and replacing the non-structured MMSE estimate by an estimate computed by a tap detection algorithm.

Abstract: A technique for Doppler frequency estimation and adaptation in a MediaFLO™ (Forward Link Only) receiver system includes receiving Orthogonal Frequency Division Multiplexing (OFDM) symbols in the receiver, dividing a Doppler frequency range into N ranges corresponding to N interpolation filters; determining a correlation between two OFDM symbols separated by time; estimating a Doppler frequency by the correlation of OFDM symbols; determining a ratio of the correlation of OFDM symbols; comparing the determined ratio of the correlation of OFDM symbols with a look up table of ? stored at a receiver to determine a corresponding Doppler frequency; mapping ? ranges stored at the look up table to suitable interpolation filters; estimating an interpolation filter from the mapped ? ranges mapped against determined ? ratio; adapting Time Domain Interpolation (TDI) to the selected interpolation filter; and synchronizing receiver to the TDI filter.

Abstract: A Received Signal Strength Indicator (RSSI) circuit includes a subsampling circuit that processes an input signal comprising a sampling frequency, fs, wherein the subsampling circuit subsamples the input signal, wherein the input signal is subsampled to concentrate a power in a narrow bandwidth; an analog-to-digital converter (ADC) operatively connected to the subsampling circuit, wherein the ADC digitizes the subsampled signal; and a baseband detector operatively connected to the ADC, wherein the baseband detector detects a power from the digitized subsampled signal and creates an output signal. The subsampling circuit and the ADC may operate as a single subsampling ADC. The RSSI circuit may further comprise ignoring higher order aliases at a multiple of the sampling frequency if the baseband detector is clocked at the sampling frequency.