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7177266 |
OFDM communication apparatus and OFDM communication method
An OFDM communication apparatus and OFDM communication method that both improve information signal transmission efficiency and improve demodulated signal error rate characteristics in an OFDM...
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7177265 |
Iterative method, and apparatus for acquiring time and frequency synchronization in a DSSS receiver
A method and apparatus for acquiring time and frequency synchronization in a DSSS receiver are disclosed. An iterative approach is used in acquiring a DSSS signal when the phase coherency of the...
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7177374 |
Apparatus and method for sampling frequency offset estimation and correction in a wireless communication system
A method is described for correcting sampling frequency offset (SFO) of a data packet in a communications system where carrier frequency (f c ) and sampling frequency (f s ) are driven by a common...
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7173899 |
Training and synchronization sequences for wireless systems with multiple transmit and receive antennas used in CDMA or TDMA systems
Orthogonal sequences can be developed and used for use training and synchronizing in CDMA and TDMA systems. In particular, once a sequence is developed that has the length of the product of the...
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7173975 |
Estimation of a frequency selective channel in a MIMO environment with parameters that vary within a transmission block
In an environment where a block transmission takes place via a frequency selective channel that is characterized by channel parameters that change with time in the course of the transmission of a...
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7170850 |
Transmission apparatus and method and providing medium thereof
A transmission apparatus which prevents adversely affects from an adjacent channel even without provision of a guard band. An information sequence 1 input to a mapping unit 21 - 1 of the...
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7170945 |
Method of determining parameters of an OFDM signal and associated receiver
The invention relates to a method of determining parameters of a signal of OFDM type in a receiver comprising a tuner and a demodulator, as well as such a receiver. The method comprises the...
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7170849 |
Interleaver, deinterleaver, interleaving method, and deinterleaving method for OFDM data
An interleaver and interleaving method each includes two stages, and is useful in coded orthogonal frequency division multiplexed (COFDM) wireless local area networks. A first stage performs a...
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7170944 |
Iterative assessment of multipath signal presence
Method and system for determining whether one or more multipath signals is present in a received signal frame that includes a reference symbol (RS) sequence RS(t;m 1 ) as part of the frame, and for...
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7164650 |
Method for transmitting/receiving information about orthogonal variable spreading factor codes assigned to user data in a high speed data packet access communication system
A method of transmitting and receiving information about successive orthogonal codes assigned to user data for spreading on a control channel before transmission of the user data on a plurality of...
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7164651 |
Wireless computer network including a mobile appliance containing a single chip transceiver
A wireless computer data network includes several untethered mobile units that make ad-hoc data connections with an Internet-connected base station using the IEEE-802.11a standard. Each unit...
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7161920 |
High rate, time division multiplexed, multi-MPSK MODEM with imbedded high signal-to-noise ratio tracking channel
A novel MODEM and method of operating a MODEM usable in spread spectrum communication utilizing multiple waveforms in orthogonal spread signals imbeds a tracking signal in one of the spread signals...
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7161985 |
Method and device for transmitting data on at least one electrical power supply line
The orthogonal frequency division multiplexing (OFDM) method is well-known for transmitting data on electrical power supply lines. According to this method, the items of information to be...
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7161988 |
Method and apparatus for minimizing co-channel interference
An approach is provided for minimizing co-channel interference in a communication system is disclosed. A header of a first frame is scrambled based on a first unique word. A header of a second...
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7158474 |
Interference suppressing OFDM system for wireless communications
An IS-OFDM system for point-to-point wireless communications that suppresses narrow-band interference comprises an IS-OFDM transmitter and an IS-OFDM receiver, wherein a transmitted signal...
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7158475 |
Transmitting apparatus and method and provision medium
Influence from an adjacent signal is prevented even if a guard band is not provided. A phase comparison unit 21 compares a reference window signal input to a PLL circuit 4 and a window signal...
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7158479 |
Method and apparatus for non contiguous sliding window
A method that limits data flow between two network nodes to an amount within a window where a first portion of data within a first segment of the window is separated from a second portion of data...
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7158585 |
OFDM channel estimation in the presence of interference
Systems and methods for estimating channel response in the presence of interference. Interference and/or noise present on received training symbols is estimated. Based on the measured noise and/or...
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7158476 |
OFDM receiver using polar coordinate system and method thereof
A received signal is converted into a digital signal through an A/D converter and then converted into the polar coordinate system. A synchronizer removes a frequency offset from the digital signal,...
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7151478 |
Pseudo-orthogonal waveforms radar system, quadratic polyphase waveforms radar, and methods for locating targets
In some pseudo-orthogonal waveform embodiments, a radar system transmits pseudo-orthogonal waveforms and performs multiple correlations on a combined single receiver channel signal. In some...
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7151740 |
Transmit power control for an OFDM-based wireless communication system
An open loop power control system for an orthogonal frequency division modulation (OFDM)-based fixed/mobile wireless system. A preferred system and method comprise measuring signal strength of...
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7149199 |
Multi-dimensional orthogonal resource hopping multiplexing communications method and apparatus
The present invention is related to a statistical multiplexing method and apparatus using a multi-dimensional orthogonal resource hopping multiplexing method in a wired/wireless communication...
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7145862 |
Method and apparatus for transmission and reception of data
To address the need for reducing pilot overhead, a method and apparatus for transmitting and receiving data is provided herein. A communication system having a transmitter ( 100 ) that utilizes...
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7142502 |
Technique for continuous OFDM demodulation
A technique includes receiving a signal that indicates a modulated symbol during a given time slice of the signal. Sliding window frequency transformations of the signal are performed, and each...
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7139237 |
Method and system for multirate multiuser modulation
A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency...
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7133419 |
System and method for reducing power consumption by spectral shaping of signals
The present invention provides a system and method for reducing power consumption by shaping the spectrum of a downstream signal. Incremental improvements in power consumption due to spectral...
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7133355 |
Interference suppressing OFDM method for wireless communications
A method for operating an IS-OFDM system for point-to-point wireless communications that suppresses narrow-band interference comprises the steps of producing and transmitting an IS-OFDM signal...
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7133354 |
Synchronization techniques for a wireless system
Power control methods and apparatus for use in a sectorized cell of an OFDM communications system are described. Each sector of a cell uses the same frequencies and transmission times and is...
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7133353 |
CDMA system using quasi-orthogonal codes
A CDMA communication system uses a set of quasi-orthogonal codes to supplement the standard set of Walsh codes used in conventional systems. Users are assigned a code selected from the set of Walsh...
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7133352 |
Bi-directional communication channel
A communication system using OFDM transmission from a base station to subscriber units, includes means for achieving a bi-directional channel. These means comprise transmitting means in the...
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7130293 |
Transmitter, transmitting method, receiver, and receiving method for MC-CDMA communication system
A reception step receives a multicarrier signal containing subcarriers, at least one of which a synchronization signal is transmitted therein, multiplied only by a synchronization signal spreading...
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7126998 |
Envelope stabilization method and apparatus
A system and method is proposed to significantly reduce the peak to average power ratio (PAPR) for an OFDM system by stabilizing the signal envelope. By using partial response (PR) signaling to...
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7123662 |
OFDM detection apparatus and method for networking devices
An OFDM detection apparatus and method for networking devices. First, a sample sequence is taken from the beginning of a newly arrived network packet. Next, a first correlation sequence between the...
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7116981 |
Apparatus and method for channel quality estimation and link adaptation in orthogonal frequency division multiplexing (OFDM) wireless communication system
A method for channel quality estimation and link adaptation for an OFDM wireless communication system includes: (a) estimating a channel gain and a noise power, and measuring an SNR in...
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7116632 |
System and method for determining synchronization point in OFDM modems for accurate time of flight measurement
A system and method including an algorithm that can use the linear time shift property of the subcarrier modulation to provide accurate frame synchronization for communications between nodes in a...
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7113745 |
Method to achieve diversity in a communication network
A method of wirelessly communicating between units comprises using at least two repeaters between a transmit unit and a receive unit. The repeaters enable a diversity scheme to be emulated.
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7110351 |
Enhanced ARQ with OFDM modulation symbols
A method and apparatus are provided for error correction in a communication system employing Orthogonal Frequency Division Multiplexing. When a remote unit receives an OFDM symbol, a retransmission...
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7110783 |
Power efficient channel scheduling in a wireless network
A method and system for optimizing channel access scheduling for multiple wireless computing devices over a wireless network improves channel access efficiency with respect to a primary channel. An...
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7110349 |
Adaptive communications methods for multiple user packet radio wireless networks
An exemplary wireless communication network that includes a base that communicates with remote units located in a cell of the network. A base concatenates information symbols with a preamble...
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7110352 |
Direct-sequence CDMA method and device
In code division multiple access communications wherein a plurality of data streams carrying a plurality of transmit symbols are spread by a plurality of assigned spread code, the data streams are...
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7110350 |
Wireless LAN compatible multi-input multi-output system
A system and method for enhancing the data rate of a WLAN. Through the deployment of a MIMO system, the data rate ordinarily expected of a SISO type system can be doubled. Yet, the MIMO system of...
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7106690 |
Method for generating and transmitting optimal cell ID codes
A method for generating and transmitting optimal cell (base station) identification codes in a W-CDMA mobile communication system is disclosed. In the present invention, the cell identification...
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7106810 |
Method and apparatus for a 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...
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7106689 |
OFDM transmission/reception apparatus
Modulation section 201 performs modulation processing on transmission data. Mapping control section 202 controls mapping of the baseband signal onto the subcarriers so that the important...
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7103026 |
Use of chip repetition to produce a flexible bandwidth DS-CDMA system
A method is disclosed for obtaining a spreading code set for a code division multiple access (CDMA) communications system. The method includes (a) generating a P′×P′ spreading code set where...
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7103106 |
System and method for generating a modified IOTA pulse for reducing adjacent channel interference (ACI) in an isotropic orthogonal transfer algorithm (IOTA) orthogonal frequency division multiplexing (OFDM) system
An improved multicarrier modulation system and method, which has the advantages of both isotropic orthogonal transfer algorithm orthogonal frequency division multiplexing (IOTA OFDM) and scalable...
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7099353 |
Orthogonal frequency division multiplexing system with superframe synchronization using correlation sequence
A wireless transmitter (TX 1 ). The transmitter comprises circuitry for providing a plurality of control bits (CONTROL) and circuitry for providing a plurality of user bits (USER). The transmitter...
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7099268 |
Orthogonal frequency division multiplex modem circuit
To provide an orthogonal frequency division multiplex modem circuit which can multiplex signals, whose bit rates and QoS are different from one another, and can transmit the signals via one OFDM...
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7099270 |
Multi-path equalization for orthogonal frequency division multiplexing communication system
A multi-path equalization system for orthogonal frequency division multiplexing communication (OFDM) system includes a first estimator for estimating the channel characteristic using pilot signal....
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7099371 |
Method for generating and allocating code pairs of orthogonal spreading codes
The present invention relates to an orthogonal spreading code in a code division multiple access (CDMA) mobile communication system, and more particularly, to a method for generating and allocating...
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