Host processor assisted fast re-synchronization techniques for DVB-H systems
First Claim
1. A method of performing re-synchronization for a Digital Video Broadcasting over Handheld (DVB-H) receiver, said method comprising:
- performing a time division multiplexing (TDM) data burst transmission sequence on bits of data received by said DVB-H receiver;
performing a data bit re-synchronization sequence on said DVB-H receiver, wherein said data bit re-synchronization sequence comprises synchronization of said DVB-H receiver after wake up for receiving a next sequence of a data burst;
removing an on-chip timer and internal state registers in said DVB-H receiver; and
allowing said DVB-H receiver to power off in between receipt of data bursts.
31 Assignments
0 Petitions
Accused Products
Abstract
A system and method of performing re-synchronization for a Digital Video Broadcasting over Handheld (DVB-H) receiver, wherein the method comprises performing a time division multiplexing (TDM) data burst transmission sequence on bits of data received by the DVB-H receiver; performing a data bit re-synchronization sequence on the DVB-H receiver; removing an on-chip timer and internal state registers in the DVB-H receiver; and allowing the DVB-H receiver to power off in between receipt of data bursts. Preferably, the removing process reduces the time to perform the re-synchronization in the DVB-H receiver. Preferably, the data bit re-synchronization sequence comprises performing an automatic gain control (AGC) lock process; performing a mode and guard detecting process; performing a frequency offset estimation process; performing a transmit parameter signaling (TPS) detection process; performing a timing and carrier loop lock process; and performing an equalizer delay process.
15 Citations
20 Claims
-
1. A method of performing re-synchronization for a Digital Video Broadcasting over Handheld (DVB-H) receiver, said method comprising:
-
performing a time division multiplexing (TDM) data burst transmission sequence on bits of data received by said DVB-H receiver; performing a data bit re-synchronization sequence on said DVB-H receiver, wherein said data bit re-synchronization sequence comprises synchronization of said DVB-H receiver after wake up for receiving a next sequence of a data burst; removing an on-chip timer and internal state registers in said DVB-H receiver; and allowing said DVB-H receiver to power off in between receipt of data bursts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of performing re-synchronization for a Digital Video Broadcasting over Handheld (DVB-H) receiver, said method comprising:
-
performing a time division multiplexing (TDM) data burst transmission sequence on bits of data received by said DVB-H receiver; performing a data bit re-synchronization sequence on said DVB-H receiver, wherein said data bit re-synchronization sequence comprises synchronization of said DVB-H receiver after wake up for receiving a next sequence of a data burst; removing an on-chip timer and internal state registers in said DVB-H receiver; and powering said DVB-H receiver off in between receipt of data bursts, wherein said method further comprises using a processor from a host data transmission device to use a counter to count down a period of time after which the host processor turns on a demodulator in said DVB-H receiver, wherein said method further comprises said host processor; (a) reading a value of said period of time from said DVB-H receiver; (b) turning off said demodulator; (c) initiating a timer counting said period of time; and (d) turning on said demodulator after said period of time being counted on said timer expires, wherein the removing reduces the time to perform said re-synchronization in said DVB-H receiver. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
-
20. A system of performing re-synchronization for a Digital Video Broadcasting over Handheld (DVB-H) receiver, comprising an on-chip timer and internal state registers, said system comprising:
-
a first logic unit that performs a time division multiplexing (TDM) data burst transmission sequence on bits of data received by said DVB-H receiver; a second logic unit that performs a data bit re-synchronization sequence on said DVB-H receiver, wherein said data bit re-synchronization sequence comprises synchronization of said DVB-H receiver after wake up for receiving a next sequence of a data burst, and wherein said data bit re-synchronization sequence comprises; performing an automatic gain control (AGC) lock process comprising measuring and comparing A/D output signal strength with a pre-set threshold; performing a mode and guard detecting process comprising detecting transmission mode and guard information; performing a frequency offset estimation process comprising obtaining fine- frequency offset information; performing a transit parameter signaling (TPS) detection process comprising decoding TPS information to program blocks of said DVB-H receiver; performing a timing and carrier loop lock process comprising adjusting timing and frequency offsets based on a digital phased lock loop; and performing an equalizer delay process comprising estimating and equalizing channel state information; a host processor communicatively linked with said DVB-H receiver from a host data transmission device to use a counter to count down a period of time after which said host processor turns on a demodulator in said DVB-H receiver; means for removing said on-chip timer and internal state registers in said DVB-H receiver; and a cycle clock that powers said DVB-H receiver off in between receipt of data bursts, wherein the removing means reduces the time to perform said re-synchronization in said DVB-H receiver, wherein said host processor; reads a value of said period of time from said DVB-H receiver; turns off said demodulator; initiates a timer counting said period of time; turns on said demodulator after said period of time being counted on said timer expires; stores a last value of an AGC control word when said DVB-H receiver enters into a sleep mode of operation, wherein said last value of said AGC control word is used to initialize a new AGC control word when said DVB-H receiver turns on from said sleep mode of operation; stores a detected mode and guard from an immediately preceding data burst when said DVB-H receiver enters into a sleep mode of operation, wherein the stored detected mode and guard is used when said DVB-H receiver turns on from said sleep mode of operation; stores an estimated coarse frequency offset from an immediately preceding data burst when said DVB-H receiver enters into a sleep node of operation, wherein the stored estimated coarse frequency offset initializes a coarse frequency offset for an incoming data burst when said DVB-H receiver turns on from said sleep mode of operation; stores internal states of timing and carrier frequency tracking loops from an immediately preceding data burst when said DVB-H receiver enters into a sleep node of operation, wherein the stored internal states of timing and carrier frequency tracking loops initialize a coarse frequency offset for an incoming data burst when said DVB-H receiver turns on from said sleep mode of operation; and corrects an orthogonal frequency-division multiplexing (OFDM) symbol number, correct a frame number, and correct a Fast Fourier Transform (FFT) trigger point when said DVB-H receiver turns on from a sleep mode of operation.
-
Specification