초록 ▼

Method and apparatus for receiving signals in gateways for satellite repeater type spread spectrum communication systems making more efficient use of data transfer capacity and diversity processing. Several communication signals are received by multiple analog receivers and converted into digital fo

Method and apparatus for receiving signals in gateways for satellite repeater type spread spectrum communication systems making more efficient use of data transfer capacity and diversity processing. Several communication signals are received by multiple analog receivers and converted into digital format. The digital communication signals are transferred from each analog receiver into a series of demodulation or FHT modules in which they are first despread into encoded data symbols using predetermined PN coding sequences, and then mapped into symbol energy metrics using orthogonal transformers, such as fast Hadamard transformers. The transformation output for each communication channel from each analog receiver is input to a single metric receiver for a data channel or subscriber, where it is subjected to conventional metric signal processing to reconstruct the data. A set of dedicated modules is coupled to each analog receiver for handling each diversity path or subscriber active communication system channel being transferred through that receiver or analog path. Each demodulation or FHT module comprises despreading elements and FHT components that are easily distributed in processing arrays within the gateway.

대표청구항 ▼

A method for receiving signals in a spread spectrum communication system in which information is communicated by orthogonally encoded channels within communication signals, comprising the steps of: receiving communication signals over one or more diversity transfer paths from one or more system subs

A method for receiving signals in a spread spectrum communication system in which information is communicated by orthogonally encoded channels within communication signals, comprising the steps of: receiving communication signals over one or more diversity transfer paths from one or more system subscribers using one or more analog receivers, and converting them to digital communication signals; applying said digital communication signals to a corresponding set of demodulating modules connected to each analog receiver, the number of modules being equal to the product of a predetermined maximum number of subscribers to be serviced by a receiver and a maximum expected average number of signal paths over which communication signals are to be received from each subscriber; despreading each of said digital communication signals using preselected pseudorandom noise (PN) type code sequences in one portion of said demodulating modules; transforming at least a preselected number of despread digital communication signals each into energy metric signals indicative of energy values associated with encoded data in another portion of said demodulating modules; and transferring resulting energy metric signals corresponding to signals intended for a subscriber as an input to at least one metric receiver pre-assigned to said subscriber from a plurality of metric receivers.