Granted Patent B2

US 8,279,943 · App. 11/995,984 · Granted Oct 2, 2012

Abstract

Claims (72)

1. Method for reception of Digital Video Broadcasting-Handheld (DVB-H) signals wherein a MPEG Transport Stream (MPEG TS) is grouped into packets belonging to a certain IP data stream and forming bursts in time slices, the MPEG-TS is modulated into Orthogonal Frequency Division Modulation (OFDM) symbols, these symbols are grouped in frames, the frames themselves are grouped in superframes and symbols, frames and superframes are provided with numbers, whereas a transmitter does not change the transmission parameters (FFT mode, guard interval, code rate, modulation format) between successive bursts and a receiver is notified about a relative time from a first burst to transmission of the next burst and the receiver is switched off between the first and the next burst comprising:

accurately calculating a receive time of the next burst from the DVB-H delta-t time received in the first burst;

setting a wake up timer and powering down the receiver;

powering up the receiver for reception of the next burst at the superframe boundary;

executing signal acquisition;

calculating the symbol number and frame number of the first symbol that contains relevant data to be modulated within the actual superframe;

calculating the number of bits to be discarded from the MPEG-TS to align with a boundary of a MPEG-TS-packet;

discarding the bits; and

starting demodulation at the boundary of the MPEG-TS-packet;

and wherein a Digital Video Broadcasting-Terrestrial (DVB-T) receiver skips:

detection of a channel bandwidth selected from one of 8, 7, 6, and 5 MHz;

detection of a guard interval duration;

detection of a FFT mode selected from one of 8 k, 4 k and 2 k;

detection of a modulation format;

detection of a code rate;

detection of hierarchical transmission; and

detection of a frame and super frame boundaries.

2. A Digital Video Broadcasting-Handheld (DVB-H) receiver, configured to maintain an accurate course symbol timing within the symbol with an accuracy better than 25 ppm, the DVB-H receiver comprising: a Digital Video Broadcasting-Terrestrial (DVB-T) baseband receiver, an analog-to-digital converter, a clock, and a protocol processor,

wherein the DVB-T receiver is configured to skip:

detection of a channel bandwidth selected from one of 8, 7, 6, and 5 MHz;

detection of a guard interval duration,

detection of a FFT mode selected from one of 8 k, 4 k and 2 k,

detection of a modulation format,

detection of a code rate,

detection of hierarchical transmission, and

detection of a frame and super frame boundaries.

3. The DVB-H receiver according to claim 2 wherein the receiver has the ability is configured to start demodulation at a timing instant given by the protocol processor.

4. The DVB-H receiver according to claim 2 wherein the protocol processor calculates a timing instance for demodulation start and/or acquisition or synchronization start and the number of bits to be discarded.

5. A method for reception of Digital Video Broadcasting-Handheld (DVB-H) signals using a Digital Video Broadcasting-Terrestrial (DVB-T) receiver comprising:

grouping packets of an MPEG Transport Stream (MPEG TS) belonging to an IP data stream;

forming bursts in time slices;

modulating an MPEG-TS into Orthogonal Frequency Division Modulation (OFDM) symbols;

grouping the symbols in frames;

grouping the frames in superframes and symbols;

identifying the frames and superframes;

transmitting bursts, on a transmitter that does not change the transmission parameters (FFT mode, guard interval, code rate, modulation format);

notifying a receiver about a relative time from a first burst to a second burst;

switching the receiver off between successive bursts;

calculating a receive time of successive bursts from a DVB-H delta-t time received in the previous burst;

setting a wake up timer;

powering down the receiver;

powering up the receiver to receive the successive burst at the superframe boundary;

acquiring a signal;

calculating the symbol identity and frame number of the first symbol that contains relevant data to be modulated within the superframe;

calculating the number of bits to be discarded from the MPEG-TS to align with a boundary of a MPEG-TS packet;

discarding the bits; and

starting demodulation at the boundary of the MPEG-TS;

wherein the DVB-T receiver skips detection of:

a channel bandwidth selected from one of 8, 7, 6, and 5 MHz;

a guard interval duration;

a FFT mode selected from one of 8 k, 4 k, and 2 k;

a modulation format;

a code rate;

hierarchical transmission;

frame boundaries; and

super frame boundaries.

6. A Digital Video Broadcasting-Handheld (DVB-H) receiver system comprising:

an RF module, a Digital Video Broadcasting-Terrestrial (DVB-T) baseband receiver, an analog-to-digital converter, a clock and a protocol processor;

wherein the protocol processor is configured to maintain accurate course symbol timing within the symbol; and

wherein the DVB-T receiver is configured to skip detection of:

a channel bandwidth selected from one of 8, 7, 6 and 5 MHz;

a guard interval duration;

a FFT mode selected from one of 8 k, 4 k, and 2 k;

a modulation format;

a code rate;

a hierarchical transmission;

a frame boundaries; and

super frame boundaries.

7. The DVB-H system of claim 6 wherein the receiver is configured to demodulate when instructed by the processor.

8. The DVB-H system of claim 6 wherein the protocol processor is configured to calculate a timing instance for demodulation start.

9. The DVB-H system of claim 6 wherein the protocol processor is configured to calculate acquisition or synchronization start.

10. The DVB-H system of claim 6 wherein the protocol processor is configured to calculate the number of bits to be discarded.

Assignments (20)