Data modulation

A base station implementable in a radio-based communication network and comprising:

• a modulator, comprising:
• a symbol mapper configured to receive a bit sequence corresponding to a radio burst and comprising data bits, training bits, tail bits and guard bits and to map respective sets of at least one bit of said bit sequence into respective symbols to form a symbol sequence comprising data symbols, training symbols, tail symbols and guard symbols;
• a vector precoder configured to apply a vector precoding transformation to said data symbols and said training symbols to form corresponding precoded symbols of said data symbols and said training symbols;
• and
• a symbol processor configured to form a sequence of transmit symbols based on said tail symbols and said guard symbols from said symbol mapper and said precoded symbols from said vector precoder;
• and
• a transmit antenna configured to transmit a radio burst carrying said sequence of transmit symbols during a time slot having a length of 15/26 ms.

A data modulation method comprising:

• inputting a bit sequence corresponding to a radio burst and comprising data bits, training bits, tail bits and guard bits;
• mapping respective sets of at least one bit of said bit sequence into respective symbols to form a symbol sequence comprising data symbols, training symbols, tail symbols and guard symbols;
• applying a vector precoding transformation to said data symbols and said training symbols to form corresponding precoded symbols of said data symbols and said training symbols;
• and
• forming a sequence of transmit symbols based on said tail symbols and said guard symbols and said precoded symbols.