摘要:
A method and apparatus for mitigating unwanted communication are disclosed. A request to establish communications is received at a first Protection Against Unsolicited Communications in Internet Protocol Multimedia Subsystem (PUC) server. The PUC server determines whether to block the communication. If the communication is blocked, the sender is informed and a record of the blocked communication may be stored. Alternatively, the communication may be delivered to a subsequent PUC server (along with appended information about the sender), the receiver or sent to storage.
摘要:
A MIMO communications system includes a transmitter, and a transmit antenna array connected to the transmitter and having M antenna elements for transmitting M source signals. A receive antenna array is connected to a receiver and has N antenna elements for receiving at least M different summations of the M source signals, with N being less than M. A signal separation processor is connected to the receiver for forming a mixing matrix that includes the at least M different summations of the M source signals so that the mixing matrix has a rank equal to at least M. The signal separation processor separates desired source signals from the mixing matrix.
摘要:
A communications device includes an antenna array for receiving different summations of source signals from a plurality of signal sources, a receiver coupled to the antenna array for receiving the different summations of source signals, and a signal separation processor coupled to the receiver. Processing by the signal separation processor includes creating a matrix based upon the different summations of source signals, with the matrix being defined by linear independent equations with fewer equations than unknowns. The matrix is underdetermined, and parameters associated with the matrix are modified based upon different sets of parameter values, and respective matrix quality factors associated with the different sets of parameter values are determined. The matrix is then biased with a preferred set of parameter values so that the solution space may be narrowed for obtaining a solution.
摘要:
A MIMO communications system includes a transmitter, and a receiver synchronized with the transmitter. The transmitter changes the power levels for each layered space data stream on a time slotted basis. The data streams arrive at the receiver with various power levels, which provides suitable differences in the received signals for population of a mixing matrix for signal separation processing.
摘要:
A communications device for separating source signals provided by M signal sources includes an antenna array comprising N antenna elements for receiving at least N different summations of the M source signals, with N and M being greater than 1. The N antenna elements include at least one antenna element for receiving at least one of the N different summations of the M source signals, and at least two correlated antenna elements for receiving at least two of the N different summations of the M source signals. The at least two correlated antenna elements are uncorrelated with the at least one antenna element. A receiver is connected to the antenna array. A blind signal separation processor is connected to the receiver for forming a mixing matrix comprising the at least N different summations of the M source signals, and for separating desired source signals from the mixing matrix. The mixing matrix has a rank equal up to at least N.
摘要:
A method and apparatus perform remote memory management in an acknowledge-back selective call communication system (100) comprising an infrastructure (102) and a selective call receiver (120). The infrastructure (102) transmits (904) a notification (406) of a pending message for the receiver (120). The receiver (120) reports (906) in response a memory value (414) specifying space available in a memory (322) for storing the pending message. The infrastructure (102) compares (908) the memory value (414) with the length of the pending message to see if sufficient memory space is available to store the pending message in the receiver (120). The infrastructure (102) controls further processing of the pending message based on the result of the comparison.
摘要:
A method and apparatus identifies (810) communication cells (500) in a simulcast radio communication system (100) comprising the cells (500) and a portable communication unit (PCU) (108). Identification bit .patterns (602, 604, 606) are assigned (802) to the cells (500) in a manner such that when transmissions of the identification bit patterns are received simultaneously from cells (500) adjacent to one another, thereby producing a received interference bit pattern (708), identities of the cells (500) received can be resolved to a subset of the cells (500) by analysis of the received interference bit pattern (708), wherein the subset is inclusive of the cells (500) received.
摘要:
A paging system (100) includes a transmitter (104) for transmitting first information including a transmitted page, a receiver (108) for receiving second information, and a diagnostic controller (106) coupled to the transmitter (104) and the receiver (108) for monitoring the first and second information to determine whether the transmitted page was correctly received by the receiver (108).
摘要:
A wireless communication method and antenna system for determining the direction of arrival (DOA) of received signals in azimuth and elevation, (i.e., in three dimensions), to form a beam for transmitting and receiving signals. The system includes two antenna arrays, each having a plurality of antenna elements, two first stage multi-mode-port matrices, at least one second stage multi-mode-port matrix, an azimuth phase detector, an elevation amplitude detector, a plurality of phase shifters and a transceiver. The antenna arrays and the first stage multi-mode-port matrices form a plurality of orthogonal omni-directional modes. Each of the modes has a characteristic phase set. Two of the modes' phases are used to determine DOA in azimuth. The second stage multi-mode-port matrix forms a sum-mode and a difference-mode used to determine the DOA of the received signals in elevation. A beam is formed in the direction of the received signals by adjusting the phase shifters.
摘要:
A method and apparatus for performing Joint Randomness Not Shared by Others (JRNSO) is disclosed. In one embodiment, JRNSO is determined in Frequency Division Duplex (FDD) using a baseband signal loop back and private pilots. In another embodiment, JRNSO is determined in Time Division Duplex (TDD) using a baseband signal loop back and combinations of private pilots, private gain functions and Kalman filtering directional processing. In one example, the FDD and TDD JRSNO embodiments are performed in Single-Input-Single-Output (SISO) and Single-Input-Multiple-Output (SIMO) communications. In other examples, the FDD and TDD embodiments are performed in Multiple-Input-Multiple-Output (MIMO) and Multiple-Input-Single-Output (MISO) communications. JRNSO is determined by reducing MIMO and MISO communications to SISO or SIMO communications. JRNSO is also determined using determinants of MIMO channel products. Channel restrictions are removed by exploiting symmetric properties of matrix products.