Communication system for broadcasting to mobile users
First Claim
1. A method for broadcasting over a channel to users in a coverage region, said method comprising the steps of:
- selecting a communication system architecture;
defining a performance metric based upon the communication system architecture selected;
determining communication system performance requirements based upon the defined performance metric;
mapping the performance metric as a function of position in the coverage region to determine required weighted link margins across the coverage region;
selecting antenna gain patterns of a transmit and a receive antenna to generate the required link margins; and
transmitting a signal from the transmit antenna to the receive antenna in the coverage region based upon the required link margins.
3 Assignments
0 Petitions
Accused Products
Abstract
A communication system (10) implemented to be specifically matched to the time and spatially dependent statistics of a transmission channel (36). The communication system (10) is used for broadcasting over the channel (36) to users in a coverage region (18). The communication system (10) includes a transmitter (12) having an error correction encoder (30) and a weighted interleaver (32). The error correction encoder (30) includes a first input to receive data bits and a first output. The error correction encoder (30) expands each data bit received at said input by an encoder rate. The weighted interleaver (32) includes a second input to receive the expanded data bits and a second output. The weighted interleaver (32) has a non-uniform delay distribution between a minimum delay and a maximum delay to interleave the expanded data bits by the non-uniform delay distribution. The communication system (10) also employs a weighted link margin matched to the time and spatially dependent statistics of the transmission channel.
-
Citations
13 Claims
-
1. A method for broadcasting over a channel to users in a coverage region, said method comprising the steps of:
-
selecting a communication system architecture;
defining a performance metric based upon the communication system architecture selected;
determining communication system performance requirements based upon the defined performance metric;
mapping the performance metric as a function of position in the coverage region to determine required weighted link margins across the coverage region;
selecting antenna gain patterns of a transmit and a receive antenna to generate the required link margins; and
transmitting a signal from the transmit antenna to the receive antenna in the coverage region based upon the required link margins. - View Dependent Claims (2)
-
-
3. A method for broadcasting over a channel to users in a coverage region, said method comprising the steps of
receiving data bits at a first input of an error correction encoder; -
expanding each data bit received at the first input by an encoder rate;
receiving the expanded data bits at the second input to a weighted interleaver;
interleaving the expanded data bits by a non-uniform delay distribution between a minimum delay and a maximum delay; and
transmitting the expanded and interleaved data bits over the channel. - View Dependent Claims (4, 5, 6, 7, 8)
transmitting signals in the coverage region to a receive antenna in the receiver; and
weighting link margins across the coverage region to counteract regional variations in the propagation environment in the coverage region.
-
-
6. The method as defined in claim 4 further comprising the step of detecting channel fade conditions in a demodulator in the receiver and nulling a received signal if a channel fade condition is detected.
-
7. The method as defined in claim 6 further comprising the step of flagging a received signal if a channel fade condition is detected.
-
8. The method as defined in claim 3 further comprising the step of applying the data bits received by the error correction encoder to a compression algorithm prior to being received by the error correction encoder.
-
9. A method for broadcasting over a channel to users in a coverage region, said method comprising the steps of:
-
providing a transmitter having a first signal path operable to route first data bits and a second signal path operable to mute second data bits;
expanding each first data bit by a first encoder rate;
expanding each second data bit by a second encoder rate;
interleaving the expanded first data bits by a delay distribution between a first minimum delay and a first maximum delay;
interleaving the expanded second data bits by a delay distribution between a second minimum delay and a second maximum delay; and
transmitting the expand and intereaved first and second data bits over the channel. - View Dependent Claims (10, 11, 12, 13)
compressing the first data bits by a first compression algorithm; and
compressing the second data bits by a second compression algorithm.
-
-
11. The method as defined in claim 10 further comprising detecting channel fade conditions in a demodulator in the receiver and nulling a received signal if a channel fade condition is detected.
-
12. The method as defined in claim 9 further comprising the steps of:
-
transmitting communication signals in the coverage region to a receive antenna in a receiver; and
weighting link margins across the coverage region to counteract regional variations in the propagation environment in the coverage region.
-
-
13. The method as defined in claim 12 further comprising the steps of:
flagging a received signal if a channel fade condition is detected.
Specification