Channel selector arrangement

• US 5,457,711 A
• Filed: 08/06/1993
• Issued: 10/10/1995
• Est. Priority Date: 08/12/1992
• Status: Expired due to Term

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Kellermann, Walter
• Primary Examiner(s): Coles, Sr., Edward L.
• Assistant Examiner(s): NGUYEN, ANH-VINH THI
• Application Number:
  US08/103,478
• Time in Patent Office: 795 Days
• Field of Search: 375/100, 375/102, 455/133, 455/134, 455/135, 455/137, 455/132
• US Class Current: 375/347
• CPC Class Codes: H04B 7/0848 Joint weighting

Abstract

A channel selector for selecting one from among a predetermined number of received signals (e1 . . . en), and which may be used in a mobile radio system to improve the radio traffic between a mobile and a central station. The channel selector includes a summator for summing the received signals in accordance with respective weight factors (G1 . . . Gn), and an evaluation circuit for determining the weight factors on the basis of an evaluation of a characteristic, such as channel quality or signal energy, of the received signals.

Claims

1. A channel selector for use in a communication system which includes a plurality of transceiver stations which are assigned to respective communication channels for transmission of information signals therein, the channel selector being coupled to the transceiver stations for selecting from which of said channels and in what relative proportions to utilize the information signals in the respective channels;

said channel selector comprising;

receiving means for receiving the respective channel signals;

summation means for deriving a summation of the channel signals weighted in accordance with weight factors respectively applicable thereto; and

evaluation means coupled to said receiving means for carrying out quality evaluations of the channel signals and deriving from said quality evaluations the weight factors respectively applicable to respective channel signals;

characterized in that said evaluation means comprises

a signal processor for determining an energy value (E) of each channel signal;

a pause detector coupled to the signal processor for receiving the channel signal energy values and based on a threshold decision relating thereto determining a classification of each channel as being in either a message state (F) or a pause state (P);

a channel quality evaluator coupled to said pause detector for determining, in successive evaluation periods, a channel quality (Q) of each channel, said determination for a channel which is in the message state being based on a maximum channel quality (Q_k-1) thereof during a previous evaluation period and a signal-to-noise ratio of the channel signal, said determination for a channel which is in the pause state being based on the product of a predetermined factor and a channel quality (Q_k-1) of said channel during a previous evaluation period; and

processing means coupled to the channel quality evaluator for determining the weight factors for the channel signals from the applicable channel quality values, the channel for which the message state was first detected being given priority in assignment of weight factors to the various channels.

2. A fixed radio station for use in a mobile radio system, comprising a channel selector as claimed in claim 1.

3. A radio transmission system comprising a channel selector as claimed in claim 1.

4. A channel selector as claimed in claim 1, wherein said signal processor comprises a median filter.

5. A channel selector as claimed in claim 1, wherein at the end of a determined message state of a channel a predetermined time period is provided by said pause detector during which the channel continues to be treated as being in the message state notwithstanding the absence of a received signal therein.