6MHZ bandwidth OFDM transmitter with the same guard interval as 8MHZ DVB-T2

摘要

A transmitter transmits data to a receiver using OFDM symbols including plural sub-carrier symbols, some carrying data symbols and some carrying pilot symbols. A data formatter can form the data for transmission into sets of data symbols for each OFDM symbol, and an OFDM symbol builder can receive each set of data symbols from the data formatter and combine the data symbols with pilot symbols. A modulator can map the data symbols and the pilot symbols onto modulation symbols and modulate the plural sub-carriers to form the OFDM symbols. An inverse Fourier transform can convert the OFDM symbols from the frequency domain to the time domain, and a guard interval inserter can add a guard interval to each of the OFDM symbols by copying a part of the OFDM symbols and appending the copied part sequentially in the time domain to the OFDM symbols.

主权项

1. A transmitter for transmitting data to a receiver using Orthogonal Frequency Division Multiplexed (OFDM) symbols, the OFDM symbols including a plurality of sub-carrier symbols, some of the sub-carrier symbols carrying data symbols and some of the sub-carrier signals carrying pilot symbols, the transmitter comprising:
circuitry configured to
form the data for transmission into sets of data symbols for each of the OFDM symbols for transmission,receive each of the sets of data symbols and to combine the data symbols with pilot symbols according to a predetermined pattern,map the data symbols and the pilot symbols onto modulation symbols and to modulate the plurality of sub-carriers to form the OFDM symbols,convert the OFDM symbols from the frequency domain to the time domain using inverse Fourier transform,add a guard interval to each of the OFDM symbols by copying a part of the OFDM symbols and appending the copied part sequentially in the time domain to the OFDM symbols, the part corresponding to the guard interval being a predetermined guard interval fraction, andtransmit the OFDM symbols on a radio frequency carrier, wherein a bandwidth of the OFDM symbols is substantially 6 MHz and the guard interval fraction of the OFDM symbols added by the guard interval inserter is one from a set of 3/512, 6/512, 12/512, 24/512, 48/512, 57/512 and 96/512, wherein the pilot sub-carriers for the OFDM symbols are formed from continuous pilots in which pilot symbols are transmitted on the same sub-carriers of the OFDM symbols and scattered pilots in which pilot symbols are transmitted on sub-carriers at different locations in the OFDM symbols and, for each of 8K, 16K or 32K modes, a pattern of the scattered pilots P for each guard interval fraction, having a displacement in frequency between sub-carriers which are used to carry a pilot symbol between successive OFDM symbols, Dx, and a displacement Dy between successive OFDM symbols carrying one or more pilot symbols on the same subcarrier, for the respective guard interval fraction added from the set, are:Guard interval duration3/5126/51212/51224/51248/51257/51296/512PDxDyP32, 2P16, 2P8, 2 orP4, 2 orP4, 2 orP4, 2 orP4, 2orP16, 2 orP4, 4 orP4, 4 orP4, 4 ororP32, 2P32, 2P8, 2 orP8, 2P8, 2P4, 4.P16, 2