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7623579 |
Method of demodulating OFDM type signals in the presence of strong co-channel interference signals
A method of demodulating a signal in a transmission system where the modulation includes several substantially orthogonal subcarriers, and the vector of the propagation channel H[n,k] is known or...
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7623439 |
Cyclic diversity systems and methods
Embodiments of cyclic diversity systems and methods are disclosed. One system embodiment, among others, comprises a logic configured to cyclically advance, or perform the periodic equivalent of the...
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7620098 |
Enhanced method for demodulating constant-amplitude multi-code biorthogonal modulation signals
Disclosed is a demodulation method for enhancing decoding performance of information bits in a constant-amplitude multi-code biorthogonal modulation communication system, which performs encoding to...
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7616555 |
Minimum variance location estimation in wireless networks
In one embodiment, a method includes receiving received signal strength data, computing an aggregate square error surface based on the received signal strength data, computing a probability surface...
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7616554 |
Controller and transmission and reception method for radio communications in a transceiver for radio communications
A controller in a transceiver for radio communications in which the same frequency is shared between multiple communications systems is disclosed that includes: a cyclic autocorrelation value...
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7616553 |
Apparatus and method for clock synchronization in a multi-point OFDM/DMT digital communications system
A multi-point communications system is set forth herein. The communications system comprises a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a...
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7613102 |
Apparatus and method for clock synchronization in a multi-point OFDM/DMT digital communications system
A multi-point communications system is set forth herein. The communications system comprises a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a...
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7613101 |
Receiving processing method and apparatus
The apparatus includes a receiver unit which receives data; and a guard interval combining unit which combines the whole of the guard interval of the data, which is received by the receiver unit,...
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7609609 |
Apparatus and method for processing digital signal in an OFDMA wireless communication system
An apparatus and method is provided to process a digital signal in an orthogonal frequency division multiple access (OFDMA) wireless communication system. In the apparatus, a memory stores the...
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7609608 |
Method and apparatus for data transfer using a time division multiple frequency scheme with additional modulation
A method of data transmission according to one embodiment of the invention includes encoding a set of data values to produce a corresponding series of ordered n-tuples. The method also includes...
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7606165 |
What-if analysis for network diagnostics
A network troubleshooting framework is described. In an implementation, a method includes generating a first estimation of network performance by a simulator based on network settings obtained from...
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7606139 |
Preamble detection using frequency based correlation
A method for detecting a preamble location in a multiple preamble OFDM (Orthogonal Frequency Division Multiplexing) system is disclosed. An OFDM signal is generated with a plurality of frames, and...
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7602745 |
Multiple input, multiple output wireless communication system, associated methods and data structures
Embodiments of multiple input multiple output wireless communication systems, associated methods and data structures are generally described herein.
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7599344 |
Method and apparatus for reducing multi-user processing in wireless communication systems
A method and apparatus is disclosed for reducing multi-user processing at the receiver in wireless communication systems. Detected codes are grouped according to channel impulse response and a...
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7599327 |
Method and apparatus for accessing a wireless communication system
Access to a wireless communication system ( 100 ) by a subscriber station ( 101 - 103 ) is facilitated by selecting ( 705 ) an access sequence from a set of sequences that have been identified to...
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7599281 |
Low rate MIMO
Data to be transmitted via a MIMO communication system having NT transmission paths is divided into M multiple streams and each stream is transmitted from one of the transmission paths of the MIMO...
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7596181 |
Apparatus and method for frequency synchronization in OFDM system
A method and apparatus are provided for frequency synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) system, wherein the method includes the steps of transmitting OFDM symbols...
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7596167 |
Allocation method, network element, module and user device
The invention is related to a network element, comprising: means for receiving feedback information from the user device; means for creating a first orthogonality measure by using the feedback...
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7596080 |
Method for distributing data on an OFDM time-frequency grid allowing for coordination of interferences and adaptive subcarrier frequency allocation, a base transceiver station, a base station controller and a mobile network therefor
The invention concerns a method for distributing data on an OFDM time-frequency grid for data transmission from and to mobile terminals in a mobile network allowing for coordination of...
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7593316 |
Method for distributing data on an OFDM time-frequency grid, a base transceiver station, a base station controller and a mobile network therefor
The invention concerns a method for distributing data on an OFDM time-frequency grid for data transmission from and to mobile terminals in a mobile network accommodating the use of pilot subgrids...
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7590183 |
Generating signals for transmission of information
A method for generating a signal is presented. The method includes selecting a first set of carrier frequencies that are integral multiples of a first frequency interval, and selecting a second set...
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7586846 |
System and method for relaying signal in a communication system
A source node of a communication system selects one of a direct mode, a multi-hop mode, and a superposition mode as a transmission mode to be used for signal transmission from the source node to a...
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7584259 |
System and method for providing service technicians access to dispatch information
A secondary source of dispatch information is provided in the event of a failure of a primary source of dispatch information. The second source of dispatch information can be accessed...
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7583624 |
Method of idle mode control in OFDM system
The present invention discloses a method of idle mode control in an orthogonal frequency-division multiplexing (OFDM) system. By superposing idle mode control channels on a frame synchronization...
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7583582 |
M-ary orthogonal keying system
A digital modulation system provides enhanced multipath performance by using modified orthogonal codes with reduced autocorrelation sidelobes while maintaining the cross-correlation properties of...
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7580400 |
Apparatus and method for generating preamble signal for cell identification in an orthogonal frequency division multiplexing system
Disclosed are an apparatus and a method for generating a preamble signal for cell identification in an OFDM mobile communication system. The method includes the steps of generating a Walsh code...
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7577210 |
Method and system for communicating data frames
For communicating data frames, a respective data frame is transmitted from each of a plurality of transmitter antennas of a transmitter. In addition, a power of any data field that is of a...
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7577127 |
Apparatus and method for multiplexing packets for broadcast services in a mobile communication system based on orthogonal frequency division multiplexing
An apparatus and method for multiplexing packets for broadcast services in a mobile communication system based on orthogonal frequency division multiplexing (OFDM). The OFDM system has a...
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7573852 |
Transmitting/receiving apparatus and method for packet retransmission in a mobile communication system
A transmitting/receiving apparatus and method for packet retransmission in a mobile communication system. Upon request for a retransmission from a receiver, a transmitter inverts initially...
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7570684 |
Method for joint time synchronization and frequency offset estimation in OFDM system and apparatus of the same
Embodiments of the present invention include a method for performing joint time synchronization and carrier frequency offset estimation in a wireless communication system, comprising steps of: on a...
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7570626 |
Communication method, transmitting device using the same, and receiving device using the same
A transmission method for transmitting an orthogonal frequency division multiplexing signal the method includes composing, on a per unit time basis, a plurality of carrier groups each composed of...
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7564909 |
Apparatus and method for detecting ranging signal in an orthogonal frequency division multiple access mobile communication system
An apparatus and method for receiving a ranging signal in an OFDMA mobile communication system are provided. The ranging signal receiving apparatus including, a ranging subchannel extractor for...
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7564908 |
Method and apparatus for encryption of over-the-air communications in a wireless communication system
A communication device converts a bit stream to multiple symbols and provides encryption at a physical layer by shifting a phase of each symbol of the multiple symbols to produce multiple encrypted...
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7564813 |
Apparatus for adaptive resource allocation for multi-channel communication system, and a method thereof
Disclosed is an adaptive resource allocation processor in the multi-channel communication system. A channel gain for the subchannel is determined and a modulation method for each subchannel is the...
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7564774 |
Communication network using code division multiplexing technology
A communication network which can use communication bandwidth effectively. Spreading codes of a first and a second code length are assigned for every communication terminal interfaces connected to...
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7561637 |
Determination of a channel estimate of a transmission channel
A method of determining a channel estimate of a first transmission channel in a communications system. The method comprises deriving a first set of channel estimates from symbols received through...
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7561628 |
Apparatus and method for cell acquisition and downlink synchronization acquisition in a wireless communication system
An apparatus and method for cell acquisition and downlink synchronization acquisition in an OFDMA wireless communication system are provided. In an SS apparatus in a broadband wireless...
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7555034 |
Apparatus and method for detecting timing error based on cyclic correlation
Provided is an apparatus and method for detecting timing errors based on characteristics of cyclic correlation. The apparatus and method can detect the timing errors of many users by using the...
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7551679 |
Symmetrical data signal processing
In a digital communications receiver configured to receive, via a communications channel, a received first signal representing a sequence of symbols, each symbol being encoded to be representative...
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7551666 |
Wireless communications system and wireless digital receiver for use therein
A base station 2 demodulates a wireless signal after downconverting the signal to a low-frequency signal whose center frequency is fi [Hz] and oversampling the signal. A mobile station 3 ...
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7545874 |
Apparatus for pre-scaling data packets with multiple signal gain coefficients in a SIMO/MISO transceiver for communication with a SISO transceiver
Apparatus and method for use in packet data communication from a single-input-multiple-output/multiple-input-single-output (SIMO/MISO) transceiver to a single-input-single-output (SISO)...
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7545770 |
Radio communication system and radio communication method
This object is to conclude an agreement for making an insertion interval of a pilot signal variable between radio communication apparatuses and improve a throughput of a communication. A pilot...
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7542407 |
System and method for communicating digital information using time-and-frequency-bounded base functions
Systems and methods for efficiently conveying one or more broadband communication channels over a transmission medium. Communication is effected by transforming an incoming digital bit stream into...
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7539255 |
Using multiple pilot signals for timing error estimation in digital subscriber line communications
A receiving modem ( 20 ) including functionality for adjusting the synchronization of its timing relative to a transmitting modem ( 10 ), by recovering timing from a plurality of pilot tones...
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7539125 |
Method and circuit for frequency offset estimation in frequency domain in the orthogonal frequency division multiplexing baseband receiver for IEEE 802.11A/G wireless LAN standard
A method for frequency offset estimation in frequency domain is provided. The method comprises the following steps. First, a phase angle of a signal field of the input signal after processed by...
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7536168 |
Method, emitter and receiver for transmitting data in a multi-access CDMA system by fully complementary code matrixes for two-dimensional data spreading in a frequency and time direction
A method transmits data bits between at least one subscriber station and a transmitter in a radio communication system. Each data bit is transmitted on at least two different units of a first radio...
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7535822 |
Synchronization of remote units for a communication network
A method for maintaining the quality of transmission from a head end to a service unit in a telecommunications system that uses a multi-carrier transmission scheme with dynamic bandwidth allocation...
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7532902 |
Method and apparatus for cell search in wireless communication system
Disclosed is an apparatus and a method for performing a cell search in a wireless communication system. A subscriber station calculates the power of subcarriers according to their positions in a...
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7532599 |
Apparatus and method for allocating user in a multiple antenna mobile communication system supporting multi-user diversity
A user allocating apparatus and method in a multiple antenna mobile communication system supporting multi-user diversity is provided. Each user calculates effective Signal-to-Interference Noise...
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7532563 |
Mechanism to improve quality of channel estimates in OFDM transmissions
An OFDM (Orthogonal Frequency Division Multiplexing) system may utilize pilot symbol structures including two or more pilot symbols with pilot information on alternate tones. The pilot information...
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