Abstract: A linear iterative channel estimation scheme and corresponding pilot allocation scheme are provided to perfect a channel model that cancels the Inter-Carrier Interference (ICI) for multi-carrier systems (e.g., OFDM, SC-FDMA, MC-CDMA, etc.) under high mobility conditions. Two issues of the linear iterative channel estimation scheme of the channel model, namely, overloaded pilots and increased Gauss noise are specifically addressed by exemplary embodiments. With the iterative channel estimation scheme provided by the present invention, the minimum pilot number is equal to the length of multi-path delay, and the Gauss noise is not increased.

Abstract: A technique for operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations involves generating inter-cell interference information at the mobile stations and providing the inter-cell interference information to the base station. The base station uses the inter-cell interference information to calculate channel quality indicators (CQIs) and then makes scheduling decisions in response to the CQIs. Data is transmitted from the base station to the mobile stations according to the scheduling decisions.

Abstract: Orthogonal Frequency Division Multiplexing (OFDM) is a typical multi-carrier technique that has been applied by many advanced wireless communication systems, e.g., 3GPP Long Term Evolution (LTE) and WiMAX. In order to support high mobility transmission, the sub-carrier spacing of multi-carrier systems is made large enough to overcome the Doppler frequency offset. However, this large sub-carrier spacing results in lower transmission efficiency since the CP (Cyclic Prefix) consumes a considerable of radio resources. The present invention provides an adaptive scheme to determine the sub-carrier spacing in which the default sub-carrier spacing is set to support lower mobility, while the adaptively adjusted sub-carrier spacing based on User Equipment (UE) mobile velocities is set to support higher mobility.

Abstract: In multi-carrier systems, distributed resource allocation of the resources of multiple user equipments (UEs) can result in better frequency diversity gain but can also induce Inter-Carrier Interference (ICI) between UEs. This ICI can become quite serious in a high mobility environment. Based on a novel radio channel model for ICI cancellation in multi-carrier systems and an iterative channel estimation scheme for ICI cancellation in multi-carrier systems, the present invention provides a simplified equalization scheme in the frequency domain to determine and remove ICI of both a targeting UE as well as other UEs.

Abstract: A channel modeling method for Inter Carrier Interference (ICI) cancellation in multi-carrier wireless communication systems comprises: describing the channel with a plurality of fixed matrices and an equal-numbered plurality of unfixed variables; one-to-one pairing each of the described plurality of unfixed variables with one of described plurality of fixed matrices. Corresponding system is also provided. The method and system can compensate for the channel distortion of the Doppler Effect even if the Doppler Frequency Offset is relatively significant.

Abstract: A technique for operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations involves generating inter-cell interference information at the mobile stations and providing the inter-cell interference information to the base station. The base station uses the inter-cell interference information to calculate channel quality indicators (CQIs) and then makes scheduling decisions in response to the CQIs. Data is transmitted from the base station to the mobile stations according to the scheduling decisions.

Abstract: A cellular phone system where a random access channel burst has a preamble comprising two Zadoff-Chu sequences to mitigate the effects of Doppler Frequency Offset. Upon reception of a random access channel burst by a base station, division is applied to the two sequences recovered from the preamble of the received burst to provide a quotient sequence. For some embodiments, the base station correlates the quotient sequence with a Zadoff- Chu sequence to identify the user equipment that transmitted the random access channel burst. Other embodiments are described and claimed.

Abstract: A technique for managing the transmission resources in a wireless communications system (100) that includes a base station (102) and a plurality of mobile stations (104), wherein the base station is configured to transmit baseband signals from at least two antennas (106), involves identifying resource blocks that are available for baseband transmissions, identifying antennas (106) of the base station (102) that are available for baseband transmissions, and establishing a transmission scheme for the plurality of mobile stations (104) that defines both the allocation of available resource blocks and the selection of available antennas (106) amongst the plurality of mobile stations (104).

Abstract: A method for promptly redialing a broadband access server is disclosed. The method includes: sending a PPPoE Active Discovery Terminate (PADT) packet to a BAS from a client computer upon the condition that the client computer has been abnormally disconnected from the broadband access server (BAS), sending a responsive PADT packet to the client computer if the client computer is allowed to perform the prompt redial. The method further includes: sending a PPPoE Active Discovery Initiation (PADI) packet to the BAS from the client computer, sending a PPPoE Active Discovery Offer (PADO) packet to the client computer, sending a PPPoE Active Discovery Request (PADR) packet to the BAS from the client computer, sending a PPPoE Active Discovery Confirmation (PADS) packet to the client computer from the BAS so as to create a new connection between the client computer and the BAS.

Abstract: Operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations involves generating a channel estimation, predicting a future channel estimation from the channel estimation, precoding data in response to the predicted future channel estimation, and transmitting the precoded data.

Abstract: The invention relates to a space-time-frequency encoding for use in wireless communication systems. According to the encoding scheme provided by the invention, it first transforms a plurality of input element pairs into a plurality orthogonal element pairs respectively, each of the plurality of input element pairs and corresponding orthogonal element pair forming an orthogonal matrix; and then maps the first element, second element and the redundancy of the second element in each of the plurality of input element pairs and corresponding orthogonal element pair as channel elements to three predetermined time-frequency cells in a first and second two-dimension time-frequency matrix so as to make the channel elements in the first and second matrixes suitable for being transmitted via different antennas.

Abstract: A technique for operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations involves generating inter-cell interference information at the mobile stations and providing the inter-cell interference information to the base station. The base station uses the inter-cell interference information to calculate channel quality indicators (CQIs) and then makes scheduling decisions in response to the CQIs. Data is transmitted from the base station to the mobile stations according to the scheduling decisions.

Abstract: A method for wireless communication between a base station and a plurality of subscriber stations is described wherein a communication capacity is partitioned in resource units at least by code multiplexing, which resource units are distributed by the base station over said devices, wherein data from each subscriber station is spread by means of a signature sequence, characterized in that multiple resource units assigned to a common subscriber station have the same signature sequence.

Abstract: The present invention discloses an H-ARQ scheme: In the case of wireless channel is in good condition, user equipment will send NACK signals and other control information only when it has received an incorrect data packet, otherwise the user equipment will not send ACK signals; in the case of wireless channel is in bad condition, existing H-ARQ schemes will be adopted.

Abstract: The present invention provides a method and apparatus applied to pilot capture for handover between wireless communication networks. In the method, when a mobile station needs to hand over from a GSM system serving as current service network to another wireless communication network, the GSM system and the mobile station will update the logic location of the first idle frame to be met subsequently, which will be inserted after the TDMA frame where the corresponding starting point of pilot capture resides, then the mobile station utilizes idle timeslots after the starting point to form a pilot capture time window with a predefined length, eventually the mobile station captures the pilot signal of the another wireless communication network in the pilot capture time window.

Abstract: The present invention provides a space-time-frequency encoding and decoding method and apparatus used in a wireless communication system. With the encoding method provided in the invention, transmission code words and their redundant elements are properly allocated on space-time-frequency units, so that the transmission codes and their partial redundancies can be transmitted via different antennas. Accordingly, at the receiving side, the redundant elements and the corresponding code word elements can be combined, so as to enhance the SNR and diversity gains for a part of the elements in the code words, and hence enhance the reception quality for the overall data stream.

Abstract: A method for promptly redialing a broadband access server is disclosed. The method includes: sending a PPPoE Active Discovery Terminate (PADT) packet to a BAS from a client computer upon the condition that the client computer has been abnormally disconnected from the broadband access server (BAS), sending a responsive PADT packet to the client computer if the client computer is allowed to perform the prompt redial. The method further includes: sending a PPPoE Active Discovery Initiation (PADI) packet to the BAS from the client computer, sending a PPPoE Active Discovery Offer (PADO) packet to the client computer, sending a PPPoE Active Discovery Request (PADR) packet to the BAS from the client computer, sending a PPPoE Active Discovery Confirmation (PADS) packet to the client computer from the BAS so as to create a new connection between the client computer and the BAS.

Abstract: The present invention provides a transmission method and apparatus for cancelling inter-carrier interference in wireless communication systems. Particular carriers are not used for data transmission but carry weighted data to cancel the ici interference of a first group of interfering sub-carriers onto a second group of victim sub-carriers. The weights are inversely proportional to the frequency offset between the interfering sub-carriers and the victim sub-carriers.

Abstract: The invention provides methods and apparatus for transmitting and receiving a source data block in a wireless communication system using hybrid automatic retransmission request protocol. According to the scheme provided by the invention, at transmitting side, the source data block or part of source data block that is not decoded correctly at receiving side is divided into a plurality of data segments, each the plurality of data segments may be paded with known data to expand the data segments to be a predetermined lengthen, the data segment is encoded with linear code to be a data packet including the data segment and a redundancy information segment or including only redundancy information, and after that the encoded data packets are transmitted.

Abstract: A method and apparatus for implementing downlink JD (Joint Detection) in TDD CDMA communication systems, wherein the steps to be executed in the UE comprises: receiving downlink signals from a network system in a specific timeslot; acquiring the active primary and secondary channelisation codes in the specific timeslot, through processing the downlink signal; acquiring the initial ACC (Active Channelisation Codes) information for use in implementing JD in the next frame, through implementing a JD algorithm on the downlink signal by using the primary and secondary channelisation codes. An ACC dedicated channel is sent on the FPACH, carrying information relative to the use of secondary channelisation codes.