Receiver module and receiver formed from several cascaded modules

Abstract

Receiver module and receiver formed from several cascaded module. The module comprises inputs (E 1 , E 2 , E 3 , E 4 ) and outputs (S 1 , S 2 , S 3 , S 4 ) connected to a selection means (44) circuit, to a switching means (45) circuit, and to a decoding means (46, 58, 60) circuit. Such modules can be cascaded by simply connecting the corresponding inputs and outputs. The final module delivers the transmitted information. Application to differential phase modulation and orthogonal modulation spread spectrum digital transmission.

1. Receiver  A receiver module for differential phase modulation and M order orthogonal modulation spread spectrum digital transmission, said receiver module comprising:
 a first input (E 1 ) for receiving a signal (r(t)) to be processed (r(t)) ,  
 M filtering channels, each with a filter ( 40   1 ,  40   2 , . . . ,  40   M ) matched to a spread code (C i ) taken from within a group of M codes,  
 M means ( 41   1 ,  41   2 ,  41   M )  ( 41   1   , . . . ,  41     M    and  43     1   , . . . ,  43     M ) for calculating the  energy ( or amplitude)  of the  output signals of the M filtering channels on a symbol,  
 selection means ( 44 ) connected to the M energy (amplitude) calculating means  a first subset ( 41   1   , . . . ,  41     M )  of the M means ( 41     1   , . . . ,  41     M    and  43     1   , . . . ,  43     M )  for calculating the energy or amplitude , said selection means ( 44 ) being able to determine the highest  for determining a maximum energy ( or amplitude)  signal and for delivering  outputting on a first output ( 44 s) the  a channel number of the channel  corresponding to said maximum energy (amplitude)  or amplitude, 
 switching means ( 45 ) connected to the M matched filters  filtering channels across M delay circuits  a second subset ( 43   1 ,  43   2 , . . . ,  43   M ) of the M means ( 41   1   , . . . ,  41     M    and  43     1   , . . . ,  43     M )  for calculating the energy or amplitude  and having an output ( 45 s), said switching means ( 45 ) being able to switch  for switching one of its inputs to the output ( 45 d)  ( 45 s) under the  control of the channel number delivered by the selection means ( 44 ),  
 deducing means ( 46 ) connected to the first output ( 44 s) of the selection means ( 44 ) and able to deducefor determining from the channel number of the channel  the corresponding spread code (C i ) and to restorefor restoring a first data subgroup (m MOK ),  
 phase differential demodulation means ( 58 ,  60 ) connected to the output ( 44 s)  ( 45 s) of the switching means ( 45 ) and able  to restore a second data subgroup (m PSK ),  
 
       said receiver module being characterized in that:
 a) the selection means ( 44 ) also deliver  delivers to a second output ( 44 's) the selected  determined maximum energy ( or amplitude)  value,  
 b) it  said receiver module comprises supplementary inputs and supplementary outputs permitting the  cascading of several such receiver modules, 
 i) the supplementary inputs comprising: 
 a second input (E 2 ) connected to the  an input of said selection means ( 44 ), which consequently receives, besides the  M signals delivered by the M filtering channels through the first subset of the M means for calculating, the  a signal carried by said  a (M+1)th channel,  
 a third input (E 3 ) connected to the  an input of said switching means ( 45 ), which consequently receives, besides the M signals delivered by the M filtering channels through the second subset of the M means for calculating, the  a signal applied to said third input (E 3 ),  
 a fourth input (E 4 ) connected to the input of the deducing means ( 46 ) able to deduce from a  for determining from the channel number the corresponding spread code (C u )  (C i ), the fourth input being connected to a fourth output (S 4 ) of the selection means ( 44 ), 
 
 ii) the supplementary outputs comprising: 
 a first output (S 1 ) connected to the  a first input (E 1 ) across a delay means ( 61 ),  
 a second output (S 2 ) connected to the second output ( 44 s) of the selection means ( 44 ) delivering the selected  determined maximum energy ( or amplitude)  value,  
 a third output (S 3 ) connected, across a delay means ( 63 ), to the output ( 45 s) of the switching means ( 45 ),  
 athe fourth output (S 4 ) connected to the first output ( 44 s) of the selection means ( 44 ) delivering the channel number of the channel  having the maximum energy (amplitude)or amplitude. 
 
 
 
     
     
       2. Receiver  A receiver for differential phase modulation and orthogonal modulation digital transmission, characterized in that it comprises  comprising a plurality of receiver modules (R 1 , . . . , R i−1 , . . . , R n ), each configured in accordance with  claim 1 , said modules being cascaded, each of said n receiver modules working with a group of M particular codes, the  inputs (E 1 , E 2 , E 3 ) of a receiver module of a rank i being connected to the  corresponding outputs (S 1 , S 2 , S 3 ) of the receiver module of the rank minus  1  (i—1), the  a final receiver module of rank n (R n ) fulfilling a particular function and being called the  a master module, said master module receiving on its fourth input (E 4 ) all the  channel numbers of channels  delivered by the  fourth outputs (S 4 ) of the (n−1) preceding receiver modules, said all said  channel numbers forming a global number, the second  deducing means ( 46 ) of said master module (R n ) deducing  for determining from said global number the  a corresponding spread code and restoring a first data subgroup (m MOK ), the fourth  a phase differential demodulation means ( 58 ,  60 ) of said master module receiving the  a final switched signal and performing phase differential demodulation in order to deliver a second data subgroup (m DPSK ), said master module (R n ) then reconstructing the  a transmitted global system  symbol,
 said receiver being also characterized in that the fourth  phase differential demodulation means of the (n−1) receiver modules preceding the master module (R n ) are not used.  
 
     
     
       3. Receiver  A receiver according to  claim 2 , wherein, in each receiver module of rank i (R i ), the  selection means ( 44 ) compare the  energies of M+1 signals, namely the  energies of M output signals of M matched filters  filtering channels and the  a value of the energy applied to the  a second input (E 2 ) of the module and corresponding to the highest  a maximum energy from the  a receiver module of the  a preceding rank, said selection means functioning in the following way  functions as follows:
 if the highest  a maximum energy signal is one of the M filtered signals, said selection means ( 44 ) normally deliver the maximum energy value and the channel number of the channel , and the  switching means ( 45 ) deliver the  a corresponding switched signal to the  a third output (S 3 ),  
 if the maximum energy value is that corresponding to the signal applied to the second input (E 2 ), i.e. to the signal  from the  a preceding module (R i - 1−1 ), then said switching means ( 45 ) transmit the signal applied to the  a third input (E 3 ) directly to the third output (S 3 ), said signal consequently passing from the receiver module of rank i−1 (R i−1 ) to the receiver module of the rank i+ 1 (R   i−1 )  (R i+1 ). 
 
     
     
       4. A receiver module, comprising:
   a first delay circuit to receive a first input signal and further to output a first output signal;        a plurality of filters to receive the first input signal;        a plurality of calculating circuits, each of which is coupled to an output of one of the plurality of filters, and further wherein each of the filters is coupled to an input of more than one calculating circuit;        a selection circuit coupled to an output of a first subset of calculating circuits, the selection circuit to receive a second input signal and further to generate a second output signal and a fourth output signal, the second output signal outputting a selected maximum energy value;        a switching circuit coupled to an output of a second subset of calculating circuits, the switching circuit to receive a third input signal and further to generate a switching circuit output signal;        a deducing unit coupled to the fourth output signal of the selection circuit to determine from a channel number a corresponding spread code and to restore a first data subgroup; and        a phase differential demodulation unit coupled to an output of the switching circuit to restore a second data subgroup,        wherein the receiver module is one of a plurality of receiver modules coupled in a cascade fashion such that inputs of each receiver module are connected to outputs of a preceding receiver module and each receiver module, except a final receiver module, is configured to output the fourth output signal to the deducing unit of the final receiver module to restore the first data subgroup and to reconstitute a transmitted global symbol.     
     
     
       5. The receiver module of  claim 4 , further comprising a second delay circuit to receive the switching circuit output signal and further to output a third output signal. 
     
     
       6. The receiver module of  claim 4 , wherein the switching circuit is to select a signal to output according at least in part to the fourth output signal. 
     
     
       7. An apparatus, comprising:
   a plurality of receiver modules coupled in a cascade fashion, wherein each of the plurality of receiver modules comprises:      a first delay circuit to receive a first input signal and further to output a first output signal;        a plurality of filters to receive the first input signal;        a plurality of calculating circuits wherein each calculating circuit is coupled to an output of one of the plurality of filters, and further wherein each of the filter circuits is coupled to an input of more than one calculating circuit;        a selection circuit coupled to an output of a first subset of calculating circuits, the first subset of calculating circuits comprising more than one of the plurality of calculating circuits, the selection circuit to receive a second input signal and further to generate a second output signal and a fourth output signal, the second output signal outputting a selected maximum energy value;        a switching circuit coupled to an output of a second subset of calculating circuits, the second subset of calculating circuits comprising more than one of the plurality of calculating circuits, the switching circuit to receive a third input signal and further to generate a switching circuit output signal;        a deducing unit coupled to the fourth output signal of the selection circuit to determine from a channel number a corresponding spread code and to restore a first data subgroup; and        a phase differential demodulation unit coupled to the output of the switching circuit to restore a second data subgroup,          wherein inputs of each receiver module are connected to outputs of a preceding receiver module and each receiver module, except a final receiver module, is to output the fourth output signal to the deducing unit of the final receiver module to restore the first data subgroup and to reconstitute a transmitted global symbol.     
     
     
       8. The apparatus of  claim 7 , wherein each of the plurality of receiver modules further comprises a second delay circuit to receive the corresponding switching circuit output signal and further to output a third output signal. 
     
     
       9. The apparatus of  claim 7 , wherein each of the switching circuits is to select a signal to output according at least in part to the fourth output signal.