Abstract: A receiver for positioning using DTV signals is provided. The receiver comprises the step of calculating a transmission time of at least one pilot signal among a plurality of pilot signals disposed within a digital television (DTV) signal or information originating from a transmitter and transmitted to a mobile receiver.

Abstract: An apparatus for positioning comprising a method is provided. The method includes the step of calculating a transmission time of a training sequence of a television signal from a transmitter to a mobile receiver.

Abstract: In a decoder having a predetermined decoder structure for decoding a low density parity check (LDPC) code suitable for decoding multi-rated LDPC codes is provided. An associated method is provided. The method comprises the steps of: providing a memory for the decoding with the memory size proportional to the number of circularly shifted-identity matrices I (t); and providing a number M for both row update unit numbers and column-update unit numbers. Whereby an improved architecture having an improved logic and the memory is provided such that an improved throughput, power consumption, and memory area are achieved.

Abstract: A method for selecting parameter comprising the steps of: providing a plurality of paths each path associated with an independent antenna, and each path comprising: a set of parameters associated with a particular channel; and deriving a parameter among each and every of the set of parameters associated with a particular channel. The method further comprises the step of providing a time de-interleaver or FEC decoder shared by the plurality of paths.

Abstract: A method and apparatus for a receiver comprises: a plurality of paths with each path associated with an independent antenna. Each path comprises: a channel estimation device associated with a particular channel; and a set of parameters denoting channel characteristic associated with each path. The receiver further comprises a time de-interleaver or FEC decoder shared by the plurality of paths. Whereby at least one device that use significant amount of memory is shared by the plurality of paths.

Abstract: In a TDS-OFDM communications system for uplink wireless communication multiple accesses through sub-channelization, the system comprising: a plurality of users with each user using a portion of available time-frequency radio resources to achieve orthogonal multiple access; a plurality of available bandwidth, wherein the available bandwidth is divided into multiple sub-bands; at least one the sub-carrier in each sub-band. Inside the sub-band for each user, at least one guard sequence, being used as the guard interval between transmitted symbols.

Abstract: In a TDS-OFDM communications system for uplink wireless communication multiple accesses through sub-channelization, the system comprising: a plurality of users with each user using a portion of available time-frequency radio resources to achieve orthogonal multiple access; a plurality of available bandwidth, wherein the available bandwidth is divided into multiple sub-bands; at least one the sub-carrier in each sub-band. Inside the sub-band for each user, at least one guard sequence, being used as the guard interval between transmitted symbols.

Abstract: A transmitter comprising: a digital encoder for encoding incoming digital information; and a digital to analog converter for converting the encoded digital information into analog information is described. The transmitter further comprises an exact time framing block disposed between the digital encoder and the digital to analog converter. The exact time framing block receives the digitally encoded information and comprises a method for synchronization. The method including the steps of: providing a clock signal having at least two adjacent pulses; providing information subjected to transmission in the form of a set of frames; and accommodating a whole number of frames between the two adjacent pulses.

Abstract: In a decoder for decoding a low density parity check (LDPC) code suitable for decoding multi-rated LDPC codes, a method is provided. The method comprises the steps of: providing a memory for the decoding with the memory dependent on a parity check matrix H with maximum number of “1”s; using a number of column updating units, updating columns parallely and simultaneously producing messages; and using a number of row updating units, updating rows parallely and simultaneously producing messages. Whereby an improved architecture in a logic and the memory is provided such that an improved throughput, power consumption, and memory area is achieved.

Abstract: A method using DTV signals for positioning is provided. The method comprises the step of calculating a transmission time of a data segment of a television signal from a transmitter to a mobile receiver.

Abstract: An OFDM system is provided. The system comprises: a single symbol among a series of symbols comprising; and a series PN sequences interposed between the series of symbols, with at least one PN sequence comprising a set of PN sub-sequences, wherein each PN sub-sequence is respectively associated with an ordered sub-central frequency within the single symbol.

Abstract: A method for an improved circuit design is provided. The method comprises the steps of: provide a core ring around a circumference of a circuit design; determining at least two stages of the circuit design; identifying a set of macros for at least one stage; and placing the set of macros within an area of the circuit.

Abstract: In an OFDM system, a method for interpolating comprising the steps of: subdividing at least one frame among a plurality of frames into segments; and using at least two known quantities to interpolate a corresponding estimate.

Abstract: In an OFDM system having guard intervals interposed between symbols or frames, and having pilot signals distributed within the symbols or frames, a method for channel estimation is provided. The method comprising the steps of: in the time domain, performing an operation to obtain only a set of received pilots; and sectionalizing or subdividing the set of received pilots into a plurality of sub-sections; whereby a refined channel estimation is obtained on a sub-sectional basis.

Abstract: A method for channel equalization is provided. The method comprises the steps of: subdividing a received symbol portion into segments wherein each segment is associated with a known, segmented channel characteristic among a set of segmented, known channel characteristics spanning the received symbol.

Abstract: A packet transmission system having existing null packets is provided. The system comprises a transmitter side transmitting information packets having null packets filled with redundancy information or parity check information; and a receiver side receiving the information packets and decoding the information packets using a predetermined decoding method; whereby the information packets are transmitted only once.

Abstract: In an orthogonal frequency division multiplex (OFDM) communication system, a method at a receiver end is provided. The method comprises the steps of: providing a frame; providing a guard interval (GI) associated with the frame, the GI having a length in a time domain larger or longer than a channel span; and extracting OFDM information comprising a first OFDM information starting from a first point after the channel span to a first end point within the frame.

Abstract: In frequency equalization, a received signals goes through frequency transform, the transformed signal is divided by a frequency transform of a channel response a method for equalization. The method comprises the step of: adjusting a quotient of the division by a weight function, wherein the function varies under a set of conditions; whereby for a frequency selective channel, deep fades are adjusted, and noise or interference are reduced.

Abstract: In an orthogonal frequency division multiplex (OFDM) communication system, a method comprising the step of performing time estimation in a time domain.

Abstract: A method for compensating channel changes in an OFDM system is provided. The method comprises the steps of: providing at least two PN sequences; and using the parameters of the at least two PN sequences for determining a set of compensated values of data disposed between the at least two PN sequences.