A test apparatus for a telecommunication network based upon OFDM or SC-FDMA technology, the test apparatus comprising: a plurality of simulated mobile terminals, configured to supply respective bit streams (BS I,..., BS M), in accordance with a communication standard; a plurality of SDR stages (12.1,..., 12.N) configured to receive the bit streams (BS I,..., BS M) of respective simulated mobile terminals and to communicably couple with respective base stations of a telecommunication network, the SDR stages (12.1,..., 12.N) comprising respective SDR uplink stages (14.1,..., 14N) and respective SDR downlink stages (15.1,..., 15.N); wherein at least one SDR uplink stage (14.1) comprises: at least one parallel processing branch, which is coupled to a respective one of the simulated mobile terminals for receiving the corresponding bit stream (BS 11,..., BS 1M) and is configured to convert the respective bit stream (BS 11,..., BS 1M) into a respective baseband signal (SBB 11,..., SBB 1M) in the frequency domain, which represents the amplitude and phase associated with a respective sub-carrier assigned for a time interval; a mapping module configured to generate a respective uplink sub-carrier vector (SAU 1,..., SAU N) via a mapping of the baseband signals (SBB 11,..., SBB 1M) in which each baseband signal (SBB 11,..., SBB 1M) is assigned a sub-carrier for modulation; characterized by; an uplink inter-cell interference module, configured to combine the uplink sub-carrier vector (SAU 1) of the respective SDR stage (12.1) with the uplink sub-carrier vectors (SAU 2,..., SAU N) of at least one of the other SDR stages (12.2,..., 12, N) into a modified uplink sub-carrier vector (SAU 1 '); and an inverse-transform module, configured to receive the modified uplink sub-carrier vector (SAU 1 ') from the uplink inter-cell interference module and to perform an inverse Fourier transform of the uplink sub-carrier vector (SAU 1 '). a plurality of simulated mobile terminals, configured to supply respective bit streams (BS I,..., BS M), in accordance with a communication standard; a plurality of SDR stages (12.1,..., 12.N) configured to receive the bit streams (BS I,..., BS M) of respective simulated mobile terminals and to communicably couple with respective base stations of a telecommunication network, the SDR stages (12.1,..., 12.N) comprising respective SDR uplink stages (14.1,..., 14N) and respective SDR downlink stages (15.1,..., 15.N); wherein at least one SDR uplink stage (14.1) comprises: at least one parallel processing branch, which is coupled to a respective one of the simulated mobile terminals for receiving the corresponding bit stream (BS 11,..., BS 1M) and is configured to convert the respective bit stream (BS 11,..., BS 1M) into a respective baseband signal (SBB 11,..., SBB 1M) in the frequency domain, which represents the amplitude and phase associated with a respective sub-carrier assigned for a time interval; a mapping module configured to generate a respective uplink sub-carrier vector (SAU 1,..., SAU N) via a mapping of the baseband signals (SBB 11,..., SBB 1M) in which each baseband signal (SBB 11,..., SBB 1M) is assigned a sub-carrier for modulation; at least one parallel processing branch, which is coupled to a respective one of the simulated mobile terminals for receiving the corresponding bit stream (BS 11,..., BS 1M) and is configured to convert the respective bit stream (BS 11,..., BS 1M) into a respective baseband signal (SBB 11,..., SBB 1M) in the frequency domain, which represents the amplitude and phase associated with a respective sub-carrier assigned for a time interval; a mapping module configured to generate a respective uplink sub-carrier vector (SAU 1,..., SAU N) via a mapping of the baseband signals (SBB 11,..., SBB 1M) in which each baseband signal (SBB 11,..., SBB 1M) is assigned a sub-carrier for modulation; characterized by; an uplink inter-cell interference module, configured to combine the uplink sub-carrier vector (SAU 1) of the respective SDR stage (12.1) with the uplink sub-carrier vectors (SAU 2,..., SAU N) of at least one of the other SDR stages (12.2,..., 12, N) into a modified uplink sub-carrier vector (SAU 1 '); and an inverse-transform module, configured to receive the modified uplink sub-carrier vector (SAU 1 ') from the uplink inter-cell interference module and to perform an inverse Fourier transform of the uplink sub-carrier vector (SAU 1 '). an uplink inter-cell interference module, configured to combine the uplink sub-carrier vector (SAU 1) of the respective SDR stage (12.1) with the uplink sub-carrier vectors (SAU 2,..., SAU N) of at least one of the other SDR stages (12.2,..., 12, N) into a modified uplink sub-carrier vector (SAU 1 '); and an inverse-transform module, configured to receive the modified uplink sub-carrier vector (SAU 1 ') from the uplink inter-cell interference module and to perform an inverse Fourier transform of the uplink sub-carrier vector (SAU 1 ').