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Multichannel receiver

A receiving system and channel frequency technology, applied in the field of communication satellites, can solve problems such as increasing system costs

Inactive Publication Date: 2003-06-04
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, the FFT algorithm must be designed to handle blocks much larger than the minimum length in order to provide acceptable adjacent channel selectivity, which increases the cost of the system

Method used

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Embodiment Construction

[0020] Referring now to Figure 2, the basic principles of the present invention will be described. FIG. 2 shows the reception of a plurality of received signals into a subtractive coupling device 30 . The coupling device 30 subtracts the multi-signal waveform generated by the multi-signal combiner 34 from the received signal, leaving a residual error signal which is analyzed by a multi-signal error analyzer 31 . If, for example, a 30 MHz bandwidth somewhere in the wireless spectrum is divided into, for example, 1000 30 KHz wide channels, signals from potentially different transmitters may be received on each channel. Each signal is assumed to be centered on each channel with reasonable accuracy, but its spectrum can be spread by AM, PM, or a combination of the two to occupy its entire assigned 30KHz channel. For example, modulation may include frequency modulation of an analog voice signal according to the US AMPS cellular standard, or π / 4-DQPSK modulation with both phase and...

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Abstract

A method and apparatus for employing negative feedback in a signal processing system to improve the range of signal levels that can be processed is disclosed. First, a feedback signal is subtracted from an input signal to form a difference signal. The difference signal is then analyzed to resolve the difference signal into a number of constituent error components of reduced bandwidth. The error components are then used to refine estimation of corresponding reduced bandwidth constituents of the input signal. The estimates are then used to produce the feedback signals.

Description

technical field [0001] The present invention relates to radio receiving systems for multiple independent signals, such as cellular radiotelephone base stations, land mobile radios, and communication satellites. Background technique [0002] The most common form of a multi-channel receiving system uses a receiver chain, such as a superheterodyne receiver, for each channel to be received. The prior art contains examples of shared components between several receiver processing chains, in particular shared antennas can be used, and shared wideband low noise antenna distribution amplifiers which amplify the sum of multiple received signals and then combine the amplified result Split into separate receive chains. An example of this technique is the distribution of television signals from a shared antenna to each apartment in an apartment building. [0003] The prior art also contains examples of a single receiver chain that processes signals from multiple...

Claims

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Application Information

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IPC IPC(8): H04B1/12
CPCH04B1/123H04B1/12
Inventor P·W·登特
Owner TELEFON AB LM ERICSSON (PUBL)
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