Method and system for application of unequal error protection to uncompressed video for transmission over wireless channels
A method and system of wireless communication is provided which involves inputting information bits, wherein certain bits have higher importance level than other bits, and applying unequal protection to the bits at different importance levels. As such, important bits are provided with more protection for transmission and error recovery. Applying unequal protection involves using skewed constellations such that more important bits are provided with more error recovery protection.
1. A method of wireless uncompressed High Definition (HD) video communication, comprising the steps of:
inputting uncompressed HD video information bits, wherein certain bits have a higher importance level than other bits;
parsing the bits based on their importance levels; and
applying unequal protection to bits at different importance levels using skewed constellation mapping by performing quadrature amplitude modulation (QAM) skewed constellation mapping, such that more important bits are provided with more protection for transmission error recovery, wherein applying unequal protection using skewed constellation mapping further includes performing quadrature phase shift keying (QPSK) skewed constellation mapping to bits b 0 , b 1 , wherein: for bit b 1 , all of the received symbols in a decision region are decided as b 1 =0, and for bit b 0 , all of the received symbols in another decision regions are decided as b 0 =0, wherein as the distance between 0 and 1 for b 1 is larger than b 0 , the bit b 1 is more protected than bit b 0 .
2. The method of claim 1 wherein applying unequal protection using skewed constellation mapping further includes performing 16-QAM skewed constellation mapping to bits b 0 , b 1 , b 2 , b 3 such that: for bit b 0 , all of the received symbols in decision regions are decided as 0, and for bit b 2 , all of the received symbols in another decision regions are decided as 0, wherein for bit b 1 , the inner distance between 0 and 1 is much shorter compared to that for bits b 0 and b 2 , which provides less error protection for b 1 compared to b 0 and b 2 , and bit b 3 has the same error performance as b 1 .
3. The method of claim 1 wherein:
each constellation point is transmitted through two separate and orthogonal channels, I-channel and Q-channel, in 16-QAM modulation, and
the constellation mapping is represented as a set {(d I +r I ±r I , d Q +r Q ±r Q ), (−d I −r I ±r I , d Q +r Q ±r Q ), (−d I −r I ±r I , −d Q −r Q ±r Q ), (d I +r I ±r I , −d Q −r Q ±r Q )}, based on independent design parameters {d I , r I , d Q , r Q }, wherein the bits are unequally protected.
4. The method of claim 3 wherein UEP mapping is performed with d I =r I , d Q =r Q , utilizing gain parameters g 1 =d I =r I and g 2 =d Q =r Q for adjusting the error protection level for the I-channel and the Q-channel, respectively, such that I and Q components are multiplied by the gain factors g 1 and g 2 , respectively, to generate I and Q component outputs with unequal error protection (UEP) applied thereto.
5. A transmitter configured for transmitting communication signals using the method of claim 1 .
6. A receiver configured for receiving communication signals using the method of claim 1 .
7. A system configured for communicating signals using the method of claim 1 .
8. A method of wireless uncompressed High Definition (HD) video communication, comprising the steps of:
inputting uncompressed HD video information bits, wherein certain bits have a higher importance level than other bits;
parsing the bits based on their importance levels; and
applying unequal protection to bits at different importance levels using skewed constellation mapping by performing quadrature amplitude modulation (QAM) skewed constellation mapping, such that more important bits are provided with more protection for transmission error recovery, wherein applying unequal protection using skewed constellation mapping further includes performing 16-QAM skewed constellation mapping to bits b 0 , b 1 , b 2 , b 3 such that: for bit b 0 , all of the received symbols in decision regions are decided as 0, and for bit b 2 , all of the received symbols in another decision regions are decided as 0, wherein for bit b 1 , the inner distance between 0 and 1 is much shorter compared to that for bits b 0 and b 2 , which provides less error protection for b 1 compared to b 0 and b 2 , and bit b 3 has the same error performance as b 1 .
9. A transmitter configured for transmitting communication signals using the method of claim 8 .
10. A receiver configured for receiving communication signals using the method of claim 8 .
11. A system configured for communicating signals using the method of claim 1 .
12. A method of wireless uncompressed High Definition (HD) video communication, comprising the steps of:
inputting uncompressed HD video information bits, wherein certain bits have a higher importance level than other bits;
parsing the bits based on their importance levels; and
applying unequal protection to bits at different importance levels using skewed constellation mapping by performing quadrature amplitude modulation (QAM) skewed constellation mapping, such that more important bits are provided with more protection for transmission error recovery, wherein:
each constellation point is transmitted through two separate and orthogonal channels, I-channel and Q-channel, in 16-QAM modulation, and
the constellation mapping is represented as a set {(d I +r I ±r I , d Q +r Q ±r Q ), (−d I −r I ±r I , d Q +r Q ±r Q ), (−d I −r I ±r I , −d Q −r Q ±r Q ), (d I +r I ±r I , −d Q −r Q ±r Q )}, based on independent design parameters {d I , r I , d Q , r Q }, wherein the bits are unequally protected.
13. A transmitter configured for transmitting communication signals using the method of claim 12 .
14. A receiver configured for receiving communication signals using the method of claim 12 .
15. A system configured for communicating signals using the method of claim claim 12 .
16. A method of wireless uncompressed High Definition (HD) video communication, comprising the steps of:
inputting uncompressed HD video information bits, wherein certain bits have a higher importance level than other bits;
parsing the bits based on their importance levels; and
applying unequal protection to bits at different importance levels using skewed constellation mapping by performing quadrature amplitude modulation (QAM) skewed constellation mapping, such that more important bits are provided with more protection for transmission error recovery, wherein UEP mapping is performed with d I =r I , d Q =r Q , utilizing gain parameters g 1 =d I =r I and g 2 =d Q =r Q for adjusting the error protection level for the I-channel and the Q-channel, respectively, such that I and Q components are multiplied by the gain factors g 1 and g 2 , respectively, to generate I and Q component outputs with unequal error protection (UEP) applied thereto.
17. A transmitter configured for transmitting communication signals using the method of claim 16 .
18. A receiver configured for receiving communication signals using the method of claim 16 .
19. A system configured for communicating signals using the method of claim claim 16 .