摘要:
A method and apparatus is provided for creating a composite waveform. This composite waveform is created by coding a plurality of input digital information signals. Subsequently, the plurality of coded input digital information signals are communicated over a communication medium to a digital combiner. The digital combiner combines the plurality of coded input digital information signals. Finally, the digitally combined information signal is spectrally shaped to form a composite waveform. These composite waveform creation principals may be applied to digitally encoded voice subbands in a subband coding system as well as channel information in a direct sequence code division multiple access (DS-CDMA) communication system transmitter.
摘要:
A method and apparatus are provided for digitizing a wide frequency bandwidth signal (105). The digitizing is accomplished by separating the wide frequency bandwidth signal (105) into a plurality of narrow frequency bandwidth signals with a plurality of filters (110). Subsequently, a converter (120) generates digitized samples of the narrow frequency bandwidth signals. Finally, a composite digitized signal (160) is generated by a combiner (150) from the digitized samples which substantially represents the wide frequency bandwidth signal (105).
摘要:
An AMPS system facilitates reception and processing of a DS CDMA signal transmitted by a mobile station (125). The AMPS system provides an alternate path for the signal to be received by a DS CDMA receiver (506) system. The DS CDMA receiver system generates a signal compatible with the AMPS system, adjusts the generated signal to be proportional to the DS CDMA signal, and inputs the adjusted signal (510) into the AMPS system. The AMPS system then processes the adjusted signal for purposes of handoff of the mobile station (125) from the DS CDMA system to the AMPS system.
摘要:
A method comprising distributing channel coding on either side of a limited capacity communication path by partially channel coding a signal at a first processing point and communicating the partially coded signal over the communication path to a second processing point. The partially coded signal comprises at least some but not all of the necessary coded bits. The channel coding algorithm is completed at the second processing point using the communicated partially coded signal thereby increasing throughput over the limited capacity path while minimizing added delays.
摘要:
A method is disclosed and apparatus is described whereby plain text is modified before it is input to a binary key generator (encryptor). According to the invention, a plain text bit may be modified by a current modifying bit, which in turn, is based on a prior modifying bit, a prior plain text bit, and a prior ciphered text bit. The only data path provided to the transmitter is the encrypted key generator cipher text output. As a result, the only feed-foward path of the plain text to the channel is through the key generator, and thus the fault-immune physical barrier between the plain text and the cipher information inherent with the key generator is maintained. The invention provides a way of utilizing conventional binary key generators to digitally encrypt for radio transmission multilevel sub-band coded speech.
摘要:
According to the invention, an information signal, such as a information signal, is sampled, quantized and processed digitally through an information encoder. Digitally processed samples produced by the encoder are modulated onto a communication channel to create channel symbols having a magnitude of modulation proportional to a characteristic of a respective digitally processed sample. Both a radio frequency (RF) transmission embodiment, and a wireline embodiment are provided. In a final aspect of the present invention, encryption is provided to ensure communication privacy.
摘要:
A method includes generating a content editing command file devoid of content by editing content. The content editing command file may be used to edit other copies of the same content that was edited to generate the content editing command file. Multiple content editing command files having some variability may be combined to form an aggregated content editing command file.
摘要:
A method and apparatus determines whether a wireless apparatus (106a) that is operative to communicate over both a wireless wide area network (104) and a wireless local area network (102), will allow shared use of its short range wireless resources, such as LAN radio frequency bandwidth, optical bandwidth or other local area wireless resources, with other proximal wireless units (106b-106n) in the wireless local area network (102). In addition, the method and apparatus generated reward data (116) to provide a reward, such as free telephone calls, account credits, price reductions, or other rewards, so that a billing system is updated when a wireless apparatus (106a-106n) has been designated as allowing shared use of its wireless resources by other proximal wireless units.
摘要:
A wireless mobile device (104) provides challenge/response based authentication by receiving a first portion of a challenge (132) from an external authentication unit (102), such as a network unit, and utilizes an internal partial challenge generator (114) that internally provides a second portion of the challenge (138) and provides the internally generated second portion of the challenge (138) back to the authentication unit (102). The wireless mobile device (104) also includes combiner logic (116) that combines the externally received first portion of the challenge (132) with the internally produced second portion of the challenge (138) to produce a complete challenge (144). The wireless mobile device (104) then utilizes a response generators (118) that takes the complete challenge (144) that was produced and generates a response (146) based on the complete challenge (144), and other secret information (110) if desired using a suitable cryptographic operation. The response (146) is sent back to the authentication unit (102) for verification.
摘要:
A method of operation of a cognitive radio in a hierarchical group of cognitive radios, the hierarchy of cognitive radios including at least one master cognitive radio that has a higher position in the hierarchy than another of the cognitive radios in the group, consistent with the present invention, involves establishing a first operational policy for the group of cognitive radios; determining that the operational policy is unsuitable for use by at least one member of the group; and the master cognitive radio dictating a change in the operational policy used by the group to a second operational policy for use by the group.