摘要:
A system and method for MIMO communications is provided. A method includes receiving a data block of P matrices from a transmitter, and determining if operating conditions are met. The method also includes if operating conditions are not met, computing a test position, selecting a codeword based on the test position, and computing a metric. The metric may then be compared with an error radius to determine a validity of the codeword. If the codeword is invalid, another codeword is selected. If the codeword is valid, then the codeword is stored if all matrices have been evaluated, else another matrix is selected for evaluation. If matrices earlier in the data block have untested codewords while all codewords for a matrix being evaluated have been tested, backtracking may be performed. After the codewords for the data block have been found, the stored data may be outputted and processed.
摘要:
A base station comprising an antenna array including M antennas for transmitting data to a plurality of subscriber stations. The base station generates a first pilot signal preamble by adding a first cyclic prefix to a first pilot signal sequence and generates a second pilot signal preamble by adding a second cyclic prefix to a second pilot signal sequence. The second pilot signal sequence is a circularly shifted copy of the first pilot signal sequence. The first pilot signal preamble is transmitted from a first antenna and the second pilot signal preamble is transmitted from a second antenna concurrently with transmission of the first preamble.
摘要:
A method of providing adaptive modulation and coding in a multi-carrier wireless network that includes a plurality of subscriber stations is provided. The method includes, for each of the subscriber stations, selecting a type of modulation and a coding rate based on a signal-to-interference-plus-noise ratio (SINR) variance.
摘要:
A wireless network base station capable of canceling interference caused by a dominant interferer signal from a mobile station. The base station comprises down-converts an RF to a down-converted signal, r(n). K complex PN demodulators multiply the down-converted complex r(n) signal by PN code sequences associated with each of the K mobile stations to produce K chip streams. K Walsh code demodulators multiply each of the K chip streams by a Walsh code associated with a mobile stations to produce K raw user signals. K subtractors subtract a first estimated interference signal associated with the dominant interferer signal from the K raw user signals to produce K estimated user signals. A detector receives the K estimated user signals and produces a detected user signal for each of the mobile stations. An interference estimator then determines which detected user signal is the dominant interferer signal.
摘要:
A method of managing channels in a wireless communication system is provided. The method includes generating channel quality feedback comprising a maximum channel quality indicator (CQI) and a delta-CQI value at a subscriber station and transmitting the channel quality feedback to a base station.
摘要:
A method of providing peak scheduling in a wireless network is provided. The method includes determining a priority for each of a plurality of users in the network based on a throughput window of a finite length and scheduling the users based on the priority.
摘要:
A base station is disclosed for communicating with a subscriber station in a wireless network without requiring training signaling overhead. The base station is capable of combining a pilot signal with a data symbol and transmitting the combined pilot signal and data symbol to the subscriber station. A power level of the pilot signal is below a power level of the data symbol. The base station may be a single-input, single-output (SISO) antenna system or a multiple-input, multiple-output (MIMO) antenna system.
摘要:
A scheduler for scheduling downlink transmissions of orthogonal frequency division multiple access (OFDMA) signals using spatially directed beams to a plurality of subscriber stations in a wireless network. The scheduler schedules the downlink transmissions as a function of frequency, time, and space. The scheduler further schedules downlink transmissions to a first subscriber station based on a first null space associated with at least one subscriber station previously scheduled to receive.
摘要:
A base station for use in a 1xEV-DV wireless network comprising: 1) a radio frequency (RF) transceiver for transmitting to mobile stations in voice traffic channels and in at least one packet data channel and 2) a power allocation controller for adjusting the total transmit power allocated to the voice traffic channels and the at least one packet data channel in response to changing conditions in the 1xEV-DV wireless network. The power allocation controller monitors and detects trends in the traffic channel transmit power requirements of the voice-user mobile stations and adjusts the total transmit power according to the detected trend.
摘要:
A base station for use in a wireless network capable of communicating with a plurality of mobile stations in a coverage area of the wireless network. The base station comprises a controller for controlling use of an Auxiliary Pilot channel. The controller causes the base station to i) terminate use of the Auxiliary Pilot channel in a first mode, ii) transmit data traffic to a first mobile station using the Auxiliary Pilot channel in a second mode, and iii) transmit data traffic to the first mobile station using a traffic channel phase-matched to a wide sector pilot channel signal in a third mode.