Abstract: An assigning method of pilot signals and a base station are provided, which is adapted for the base station communicating with multiple user equipments (UEs) through multiple beams. The assigning method can be implemented by several algorithms, and the main steps of the assigning method are that processing signals on the beam domain, and determining whether one UE is interfered with others using the same pilot signal, to determine pilot signal of the UE. Accordingly, the computational speed for assigning pilot signals would be increased, and the error rate would remain low, without increasing pilot contamination.

Abstract: A user grouping method and a base station are provided, which is adapted for the base station providing services to multiple user equipments (UEs) through multiple beams. The user group method includes the following stage. In the first stage, whether beams used by the UEs are interfered with others is determined according to channel information of the UEs on each of the beams. The UEs having beams interfered with the others are assigned into same group to mitigate interference. Then, in the second stage, numbers of users and used beams in oversized groups are reduced. In the third stage, undersized groups are combined. Accordingly, computational complexity is reduced and system performance is improved.

Abstract: An address generation apparatus for quadratic permutation polynomial (QPP) interleaver receives several configurable parameters and uses a plurality of QPP units to compute and outputs a plurality of interleaving addresses according to a QPP function ?(i)=(f1i+f2i2) mod k, where f1 and f2 are QPP coefficients, k is information block length of an input sequence, 0?i?k?1, and mod is a modulus operation. Each of the plurality of QPP units is a parallel computation unit, and outputs in parallel a corresponding group of interleaver addresses, where ?(i) is also a ith interleaving address generated by the apparatus.

Abstract: A wireless communication system includes one or more base stations, which may include one or more antennas for signal communications; a transceiver device, and a communication control device. The transceiver device is configured to communicate with a first group of relay stations being configured to receive and relay a first group of wireless communication signals from at least one base station and a second group of relay stations being configured to receive and relay a second group of wireless communication signals from at least one base station. The communication control device is configured to control one or both of (1) signal transmission power of at least one antenna and (2) signal communication timing of at least one antenna.

Abstract: An address generation apparatus for a quadratic permutation polynomial (QPP) interleaver is provided. It comprises a basic recursive unit, and L recursive units represented by first recursive unit up to Lth recursive units. The apparatus inputs a plurality of configurable parameters according to a QPP function ?(i)=(f1i+f2i2) mod k, generates a plurality of interleaver addresses in serial via the basic recursive unit, and generates L groups of corresponding interleaver addresses via the first up to the Lth recursive units, wherein ?(i) is the i-th interleaver address generated by the apparatus, f1 and f2 are QPP coefficients, and k is information block length of an input sequence, 0?i?k?1.

Abstract: A signal detecting method and a receiver using the same are provided. The method includes the following steps. A receiving signal vector y is received through a number of channels, wherein the receiving signal vector y corresponds to a transmitting signal vector x transmitted by at least one of the channels. A channel matrix H is determined, wherein the channel matrix H represents at least one of the channels. A factorization matrix D is chosen, wherein D is invertible to make the channel matrix H expressed as H={tilde over (H)}D, and {tilde over (H)} is a corresponding channel matrix. The factorization matrix D is determined to make an expected value of the signal estimate error become smaller. The receiving signal vector y is detected to estimate the transmitting signal vector x according to the corresponding channel matrix {tilde over (H)} and the factorization matrix D.

Abstract: An apparatus for data processing in a multi-channel communication system is provided. The apparatus includes an encoder configured to encode a number of bits for transmission via channels in the multi-channel communication system into coded bits and split the coded bits into a number of first sets of bits at a first ratio, a number of first rate units coupled to the encoder, each of the first rate units being configured to adjust one set of the first sets of bits in size at at least one rate, and a controller configured to assign the first ratio to the encoder and the at least one rate to each of the first rate units based on conditions of the channels.

Abstract: An address generation apparatus for quadratic permutation polynomial (QPP) interleaver receives several configurable parameters and uses a plurality of QPP units to compute and outputs a plurality of interleaving addresses according to a QPP function ?(i)=(f1i+f2i2) mod k, where f1 and f2 are QPP coefficients, k is information block length of an input sequence, 0?i?k?1, and mod is a modulus operation. Each of the plurality of QPP units is a parallel computation unit, and outputs in parallel a corresponding group of interleaver addresses, where ?(i) is also a ith interleaving address generated by the apparatus.

Abstract: A system and method for identifying a resource region including a plurality of symbols, allocating pilot signals to the resource region, identifying pilot-free symbols free of the pilot signals in the plurality of symbols, arranging sacrifice carriers for a first region of a group of symbols in the pilot-free symbols at a first density for a first communication station, and arranging sacrifice carriers for a second region of the group of symbols in the pilot-free symbols at a second density for a second communication station, the first communication station mobile with respect to an access communication station at a first relative speed and the second communication station is mobile with respect to the access communication station at a second relative speed, and wherein the first density of sacrifice carriers is greater than the second density of sacrifice carriers if the first relative speed is greater than the second relative speed.

Abstract: A method for controlling communication overhead from a user equipment to a base station. The base station determines a granularity level of an amount of information about a buffer status of a user equipment buffer. The base station makes the determination based on at least one variable parameter. The determined granularity level is sent to the user equipment, and received thereby. The buffer status is sent to the base station from the user equipment in accordance with the determined granularity level.

Abstract: A scheduling method for a wireless multi-hop relay communication system, wherein the communication system includes a base station dominating a plurality of relay stations, the scheduling method including separating the plurality of relay stations into N groups, N being a natural number, dividing a period for providing a service by the base station into N phases, wherein N is the number of the groups of the relay stations, serving the relay stations in a jth group during an ith phase by the base station, wherein 1?i, j?N, and serving a user or a subordinate relay station within service areas of the relay stations not in the jth group during the ith phase by the relay stations not in the jth group.

Abstract: An address generation apparatus for a quadratic permutation polynomial (QPP) interleaver is provided. It comprises a basic recursive unit, and L recursive units represented by first recursive unit up to Lth recursive units. The apparatus inputs a plurality of configurable parameters according to a QPP function ?(i)=(f1i+f2i2) mod k, generates a plurality of interleaver addresses in serial via the basic recursive unit, and generates L groups of corresponding interleaver addresses via the first up to the Lth recursive units, wherein ?(i) is the i-th interleaver address generated by the apparatus, f1 and f2 are QPP coefficients, and k is information block length of an input sequence, 0?i?k?1.

Abstract: A signal detecting method and a receiver using the same are provided. The method includes the following steps. A receiving signal vector y is received through a number of channels, wherein the receiving signal vector y corresponds to a transmitting signal vector x transmitted by at least one of the channels. A channel matrix H is determined, wherein the channel matrix H represents at least one of the channels. A factorization matrix D is chosen, wherein D is invertible to make the channel matrix H expressed as H={tilde over (H)}D, and {tilde over (H)} is a corresponding channel matrix. The factorization matrix D is determined to make an expected value of the signal estimate error become smaller. The receiving signal vector y is detected to estimate the transmitting signal vector x according to the corresponding channel matrix {tilde over (H)} and the factorization matrix D.

Abstract: A scheduling technique for wireless multihop relay communication systems is provided. With spatial separation caused by the shadowing effect of surrounding buildings, a base station and its relay stations in a single cell are divided into several groups by following the rule that stations with severe potential interference are separated into different groups. The base station arranges the scheduling of these groups and serves these groups sequentially in the time domain. To take advantage of shadow effect, the same radio resources can be scheduled for relay stations within the same group due to the isolation of interfering signals. In the present invention, base stations and relay stations are equipped with directional antennas or sector antennas to further exploit the advantage of spatial separations. Different relay groups can also reuse the radio resource through appropriate power control. The cell capacity can be enhanced substantially because of aggressive radio resource reuse.

Abstract: A decoder suitable for use in a digital communications system utilizing an RS(n?, k?) code modified from an RS(n, k) code receives n?-symbol vectors each including k? message symbols and r?=n??k? parity symbols and decodes the n?-symbol vectors to correct errors therein, wherein n, k, n?, and k? are integers, and k?<n?<n, k?<k<n, and wherein the decoder stores therein one erasure locator polynomial ?0(x). The decoder includes a syndrome calculator for receiving the n?-symbol vectors and for calculating syndromes of each n?-symbol vector, wherein the i-th syndrome Si of one n?-symbol vector R?, (rn??1, rn??2, . . . , r0), is Si=Rs(?i+1) for i=0, 1, . . . , n?k?1, wherein Rs(x)=rn??1xn??1+rn??2xn??2+ . . . +r0, and means for finding the locations and values of the errors in each n?-symbol vector using the syndromes thereof and the one erasure locator polynomial ?0(x).

Abstract: An apparatus for data processing in a multi-channel communication system is provided. The apparatus includes an encoder configured to encode a number of bits for transmission via channels in the multi-channel communication system into coded bits and split the coded bits into a number of first sets of bits at a first ratio, a number of first rate units coupled to the encoder, each of the first rate units being configured to adjust one set of the first sets of bits in size at at least one rate, and a controller configured to assign the first ratio to the encoder and the at least one rate to each of the first rate units based on conditions of the channels.

Abstract: A scheduling method for a wireless multi-hop relay communication system, wherein the communication system includes a base station dominating a plurality of relay stations, the scheduling method including separating the plurality of relay stations into N groups, N being a natural number, dividing a period for providing a service by the base station into N phases, wherein N is the number of the groups of the relay stations, serving the relay stations in a jth group during an ith phase by the base station, wherein 1?i, j?N, and serving a user or a subordinate relay station within service areas of the relay stations not in the jth group during the ith phase by the relay stations not in the jth group.

Abstract: A system and method for identifying a resource region including a plurality of symbols, allocating pilot signals to the resource region, identifying pilot-free symbols free of the pilot signals in the plurality of symbols, arranging sacrifice carriers for a first region of a group of symbols in the pilot-free symbols at a first density for a first communication station, and arranging sacrifice carriers for a second region of the group of symbols in the pilot-free symbols at a second density for a second communication station, the first communication station mobile with respect to an access communication station at a first relative speed and the second communication station is mobile with respect to the access communication station at a second relative speed, and wherein the first density of sacrifice carriers is greater than the second density of sacrifice carriers if the first relative speed is greater than the second relative speed.

Abstract: A method for performing a handover process in a wireless communication system, the method comprising allocating a communication channel to a first infrastructure station in the wireless communication system, reserving a signature corresponding to the communication channel for the first infrastructure station, the signature enabling a user equipment attached to the first infrastructure station to communicate with a second infrastructure station in the wireless communication system over the communication channel, receiving from the user equipment a message including the signature over the communication channel, determining a timing advance as an offset to a delay of the message, and sending the timing advance to the user equipment through the first infrastructure station.

Abstract: A method of providing wireless communication, the method including providing a wireless communication network having a plurality of stations, the plurality of stations having a plurality of communication links, each communication link being between two of the plurality of stations, transmitting a signal from at least one of the stations to other stations, measuring signal quality associated with at least one of the communication links based on the signal to generate a measuring result, and determining an interference level associated with at least one of the communication links based on the measuring result.