摘要:
A apparatus and method for improved performance in radio telecommunications systems, and in particular multi-carrier code division multiple access (MC-CDMA) networks that employ pulse-shaping filters on the transmit side of a radio link. In order to more accurately transmit a radio signal bearing a symbol sequence, the modulated and spread information stream is upsampled using a technique that involves inserting zeros in the frequency domain. A corresponding downsampling procedure on the receive side permits reconstruction of the transmitted symbols. A new channel estimation algorithm may also be used, and the improved channel estimation advantageously employed to obtain more faithful symbol detection.
摘要:
A apparatus and method for improved performance in radio telecommunications systems, and in particular multi-carrier code division multiple access (MC-CDMA) networks that employ pulse-shaping filters on the transmit side of a radio link. In order to more accurately transmit a radio signal bearing a symbol sequence, the modulated and spread information stream is upsampled using a technique that involves inserting zeros in the frequency domain. A corresponding downsampling procedure on the receive side permits reconstruction of the transmitted symbols. A new channel estimation algorithm may also be used, and the improved channel estimation advantageously employed to obtain more faithful symbol detection.
摘要:
A apparatus and method for improved performance in radio telecommunications systems, and in particular multi-carrier code division multiple access (MC-CDMA) networks that employ pulse-shaping filters on the transmit side of a radio link. In order to more accurately transmit a radio signal bearing a symbol sequence, the modulated and spread information stream is upsampled using a technique that involves inserting zeros in the frequency domain. A corresponding downsampling procedure on the receive side permits reconstruction of the transmitted symbols. A new channel estimation algorithm may also be used, and the improved channel estimation advantageously employed to obtain more faithful symbol detection.
摘要:
A system and method for the efficient transmission of information in a code division multiple access (CDMA) wireless telecommunication system. To increase the rate of reliable transmission, an orthogonal frequency-division multiplexing (OFDM) scheme is implemented in a direct-spread CDMA network, this combination sometimes being referred to as multi-carrier CDMA (MC-CDMA). Information (such as voice and data), interspersed with a known pilot signal, is encoded and spread across the frequency domain, rather than the time domain as in traditional CDMA; the allowable transmission bandwidth is divided into a number of carriers. To achieve even larger transmission rates, the guardband between carriers is eliminated. To prevent interference, the number of pilot transmissions is reduced and a corresponding number of frequency bins at the border of an OFDM block are loaded with zeros. The receiver simply ignores these subcarriers when reconstructing the transmitted signal.
摘要:
A method and system of improving quality of service in a communication system is provided. The method includes the step of encoding a data set multiple times in a communication transmitter with the same or different error codes to form a plurality of encoded data sets. Each of the encoded data sets is then parallel or serial transmitted to a designated receiver. In addition, each of the encoded data sets may be adapted to an optimized burst structure for use in a TDMA system, CDMA system, or combination system thereof.
摘要:
Signalling information is conveyed from a transmitting device (101) to a receiving device (102) in a cellular radio network where user data transmission takes place on a traffic channel in discrete transmission bursts (111-120; 211-220; 310-313) consisting of consecutive symbols. A piece of signalling information is formatted into symbols which are transmitted as a block of consecutive symbols (FACCH) in a certain transmission burst of a traffic channel. It is also indicated within said certain transmission burst that it contains symbols carrying signalling information.
摘要:
Signalling information is conveyed from a transmitting device (101) to a receiving device (102) in a cellular radio network where user data transmission takes place on a traffic channel in discrete transmission bursts (111–120; 211–220; 310–313) consisting of consecutive symbols. A piece of signalling information is formatted into symbols which are transmitted as a block of consecutive symbols (FACCH) in a certain transmission burst of a traffic channel. It is also indicated within said certain transmission burst that it contains symbols carrying signalling information.
摘要:
A method, and apparatus and computer program for enabling the method, the method comprising: detecting a user input at a first apparatus and, in response to the detection of the user input, selecting content wherein the content is stored at a remote server; establishing a communication link with a second apparatus wherein the second apparatus is different from the first apparatus; transmitting information indicative of the location of the selected stored content over the established communication link to the second apparatus; receiving identification information from the second apparatus over the established communication link wherein the identification information enables at least the user of the second apparatus to be identified; and transmitting information to the remote server to enable a user associated with the received identification information to access the selected stored content.
摘要:
A method, and apparatus and computer program for enabling the method, the method comprising: detecting a user input at a first apparatus and, in response to the detection of the user input, selecting content wherein the content is stored at a remote server; establishing a communication link with a second apparatus wherein the second apparatus is different from the first apparatus; transmitting information indicative of the location of the selected stored content over the established communication link to the second apparatus; receiving identification information from the second apparatus over the established communication link wherein the identification information enables at least the user of the second apparatus to be identified; and transmitting information to the remote server to enable a user associated with the received identification information to access the selected stored content.
摘要:
Techniques for expanded content tag sharing include determining that a first user is associated with content provided by a different second user. Data is recorded that indicates the first user is authorized to associate a different third user with the content provided by the second user, without further input by the second user. In some embodiments, the data that indicates the content provided by the second user includes data that indicates a plurality of contents. Some techniques include determining a message received from a first user indicates a portion of content associated with the first user, and a second user. The portion of the content is rendered on an apparatus of the second user. The second user is prompted for associating, with the portion of the content, an item identifier, such as text or another user, for the portion of the content.